Yearly Archive December 23, 2020

Computer gong processing – high strength steel

When the material is formed by stamping, it hardens. The hardening degree of different steels is different. Generally, the increase of 3 Ksi of high strength low alloy steel is less than 10%. Note: the yield strength of dual phase steel increases by more than 40% by 20ksi! During the forming process, the metal will become completely different, completely unlike before the stamping process begins. The yield strength of these steels increases a lot after being stressed. The higher yield stress and work hardening of the materials processed by CNC lathe are equal to the great increase of flow stress. —-This results in the need for more tonnage to make parts – it increases the deformation temperature of the metal (which may burn or destroy improper lubricants), hard spots increase die wear – and the coating may not help or last as long as expected.

In the past, in the production of deep drawing or re punching parts, everyone thought that pressure resistant (EP) lubricating oil was the best choice to protect the mold. Sulfur and chlorine EP additives have been mixed into pure oil to improve mold life for a long time. However, with the emergence of new metal high strength steel and strict environmental protection requirements, the value of EP oil-based lubricating oil has decreased or even lost its market.

The development trend of modern CNC lathe precision machining is high speed, high precision, high reliability, multi-function, compound, intelligent and open structure. The main development trend is to research and develop intelligent full-function universal CNC device with open structure in both software and hardware. CNC technology is the foundation of machining automation and the core technology of CNC machine tools. Its level is related to the national strategic position and the level of national comprehensive strength. It develops with the development of information technology, microelectronics technology, automation technology and detection technology. CNC lathe precision machining is a kind of CNC machine tool with tool library and automatic tool change, which can carry out a variety of processing operations on the workpiece in a certain range.

CNC lathe precision machining is the use of CNC technology to control machining machine tools, or equipped with CNC system. The use of CNC machine tools to process mechanical parts, known as CNC machining. NC machining is different from ordinary machine tools. CNC machining needs control information, such as tool feeding, the sequence of various actions, and various auxiliary functions (such as soil shaft speed, speed, tool change, coolant switch, etc.), etc. the program is stored in the control in digital form, and the automatic machining machine tool is realized through digital control device.

CNC lathe precision machining is an efficient automation tool, is a typical electromechanical products, it can achieve high-speed processing, high precision, high degree of automation. Mechanical parts processing is an important difference from other types of automatic machine tools: CNC machine tools use flexible automation technology, that is, when the processing object changes, in addition to clamping parts and replacement tools, only need to change the processing program can automatically find out new parts, without changing other hardware equipment.

The precision of computer gong forming

How to control the accuracy of mechanical parts in the process of aluminum oxidation treatment? If there is a precision request for the thickness process dimension of fine mechanical parts, the process size or negative difference dimension of the machined parts can be increased according to the accurate size after oxidation treatment, so as to ensure that the fine and dense machined parts meet the process requirements on the drawing after the oxygenation treatment. In the machining process of mechanical parts, not only the paper size thickness has precision, but also the size request of fine hole, step, hole to edge, etc., which is the same as the processing method of thickness request.

Aluminum oxidation has an impact on the accuracy of mechanical parts, but it can be controlled in the machining process of mechanical parts, which can ensure and meet the process requirements on customer drawings!

The content of mold precision includes four aspects: dimensional accuracy, shape accuracy, position accuracy and appearance accuracy. Because of the working time of the mold, the upper and lower die position accuracy is the most important among the four kinds of precision.

Mold precision is to serve the accuracy of products, high-precision products must be guaranteed by higher precision molds, mold accuracy generally must be higher than the product accuracy of 2 or more levels.

Methods of improving die precision

1。 The precision guarantee of mould processing equipment

2。 Precision requirements of parts in mould manufacturing

①。 Die material accuracy requirements

The processing tolerance of die steel should be controlled within 300×300 + 0.005-0 ± 0.005300×500 + 0.01-0 ± 0.01500×800 + 0.01-0.01 ± 0.015800×1200 + 0.02-0.02 ± 0.02. Precision requirements of mould parts

a。 The precision of Sumi series is within 0020.002mm, and the precision of guide sleeve can be controlled.

b。 The edge forming punch is made of Misumi standard material: SKD-11, hardness: 60-62hrc, and the edge shape is: dregth, which is usually used to form the inner hole or cylinder shape of products. The precision of punching needle can be controlled within ± 0.01mm, and it can be about 2um for special requirements, and keep mirror like.

3。 The size of die gap is the main basis of die design and manufacturing accuracy. In order to ensure the accuracy of product size and shape position, as well as the product quality (such as the cross-section quality and burr height), the gap between the concave and convex dies must be ensured.

4。 The requirements of die construction precision are as follows. Luo Baihui said that from the perspective of processing and assembly, the accuracy of mold base mainly includes the following aspects:

a。 The size and position of the upper and lower plane of the template are consistent;

b。 Flatness and parallelism of large plane of formwork;

c。 Perpendicularity of guide hole to large plane;

d。 Perpendicularity between adjacent sides of formwork;

e。 The fitting accuracy between guide pillar and guide sleeve.

The main methods to ensure the accuracy of mold base are as follows:

a。 The one-time processing method is that after the large plane processing of the template is completed, the upper and lower templates are clamped together, and the plane dimensions and guide holes of two templates are processed at one time.

b。 One of the four guide holes is deviated from the symmetrical position to ensure the assembly orientation of the die.

c。 Datum is used to calibrate the table.

d。 Guide pillar and guide sleeve with high matching precision are adopted.

e。 Improve the machining accuracy of parts.

②。 From the perspective of machining and assembly, the accuracy of punch mainly includes:

a。 The shape and size accuracy of punch;

b。 Perpendicularity between adjacent sides of punch.

③。 From the perspective of processing and assembly, the accuracy of female die mainly includes:

a。 The accuracy of shape and dimension of female die;

b。 Perpendicularity between adjacent sides of die;

c。 Perpendicularity of die side to large plane;

d。 Position degree of die.

5。 The precision of forming process ensures that in the process of forming structure, the coordinate processing method is adopted whether it is processed by computer gong, EDM, WEDM or ordinary milling machine. The guarantee of the accuracy mainly depends on the accuracy of the machine tool and the accuracy of the operator’s calibration table and score. It is considered that the concept of die precision should also run through the whole process of mold design and manufacturing, just as the guiding principle and guiding ideology of establishing enterprise product quality assurance and management system.

Processing range of different types of CNC lathes

  1. High speed, precision, turning center and four axis linkage CNC lathe.
  2. High speed, high precision CNC milling and boring machine and high-speed, high-precision vertical and horizontal CNC machining center. It mainly meets the processing requirements of large and complex structure supports, shells, boxes, light metal material parts and precision parts in automobile engine cylinder block and cylinder head, aerospace, high-tech industries and other industries.
  3. Heavy and Super Heavy CNC machine tools: CNC Floor milling and boring machine, Heavy CNC gantry boring and milling machine and CNC gantry machining center, Heavy CNC horizontal lathe and vertical lathe, CNC heavy hobbing machine, etc. these products meet the requirements of parts processing in energy, aerospace, military, ship main engine manufacturing, heavy machinery manufacturing, large mold processing, steam turbine cylinder block and other industries.
  4. CNC grinding machines: CNC ultra precision grinder, high-speed and high-precision crankshaft grinder and camshaft grinder, all kinds of high-precision high-speed special grinding machines, etc., to meet the requirements of precision and ultra-precision machining.
  5. CNC EDM machine tools: large precision CNC EDM forming machines, CNC low-speed WEDM machines, precision small hole EDM machines, etc., mainly meet the special needs of large and precision mold processing, CNC machining precision parts processing, taper hole or special-shaped hole processing, aerospace, aviation and other industries.
  6. CNC metal forming machine tools (forging equipment): CNC high-speed precision sheet metal stamping equipment, laser cutting compound machine, numerical control powerful spinning machine, etc., mainly meet the needs of sheet metal mass production in automobile, motorcycle, electronic information industry, household appliances and other industries, as well as the processing requirements of various thin-walled, high-strength and high-precision rotary parts in automobile hub and military industry.
  7. CNC special machine tools and production lines: FMS / FMC and various special CNC machine tools. This kind of production line is aimed at the processing requirements of cylinder block, cylinder head, gearbox case and other parts of various varieties and variable batches in automobile, household appliances and other industries.

Economic CNC lathes have different processing methods. When the program of economical CNC lathe is finished, the tool can’t return to zero. Generally, this phenomenon is caused by control system failure. When the cutting tool is feeding or processing, it is required to run at a low speed. At this time, the stepper motor runs at a low speed and uses low-voltage power supply. When the program returns to zero, it requires fast return. At this time, the stepping motor is required to run at high speed, and the high-voltage drive power supply is used to increase the output torque and ensure normal return to zero. A switch triode is used to control the output of the high-voltage drive power supply. When the switch triode is damaged and returns to zero at high speed, the high-voltage power supply cannot be opened, and the output torque of the stepping motor is not enough, resulting in the return to zero and step loss, resulting in the cutter can not return to the original point. In view of this fault, the switch triode can be replaced.

Economical CNC lathe is an automatic machine tool with high precision and high efficiency. Equipped with multi station turret or power turret, it has a wide range of processing performance, and can process complex workpieces such as linear cylinder, oblique cylinder, circular arc and various threads, grooves, worms, etc. It is widely used in the processing and manufacturing of electrical appliances, instrumentation industry, automobile, motorcycle accessories, fasteners, bearings, photographic equipment, film machinery, hardware tools, clocks, eyes, cultural and educational supplies, motors, valves, gas pipe fittings and other high-precision and complex parts. It is the most ideal high-efficiency equipment in the hardware machinery processing industry.

Economical CNC lathe is developed on the basis of common lathe, but its automation degree has been greatly improved. The automatic control system of economical CNC lathe is mainly composed of single chip microcomputer. Through the control program, the longitudinal and transverse feed device and tool changing device of the machine tool are controlled, and the parts are processed automatically.

When the program of economical CNC lathe is finished, the tool can’t return to zero. Generally, this phenomenon is caused by control system failure. When the cutting tool is feeding or processing, it is required to run at a low speed. At this time, the stepper motor runs at a low speed and uses low-voltage power supply. When the program returns to zero, it requires fast return. At this time, the stepping motor is required to run at high speed, and the high-voltage drive power supply is used to increase the output torque and ensure normal return to zero. When the switch triode is damaged and returns to zero at high speed, the high-voltage power supply cannot be turned on, and the output torque of the stepping motor is not enough, resulting in the return to zero and loss of step, so that the cutter can not return to the original point. In view of this fault, the switch triode can be replaced.

Decomposition of CNC machining process

CNC machining center is an efficient automatic machine tool suitable for machining complex parts by mechanical equipment and CNC system. Its comprehensive processing capacity is stronger, and it can finish the processing after clamping the workpiece. The efficiency of the batch workpiece with high processing accuracy and medium difficulty is 5 ~ 10 times higher than that of the ordinary equipment. In particular, it can complete the processing that many ordinary equipment can not complete, and the complex shape, high-precision single processing or small batch and multi variety production are more suitable.

Here are some tips to teach you how to operate the CNC machining center easily

1。 In order to simplify the positioning and installation, the machining center of each fixture positioning surface should have accurate coordinate size.

2。 In order to ensure the part installation position and programming direction consistency of workpiece coordinate and machine coordinate system, and installation direction.

3。 Can be deleted after a short period of time to adapt to the new workpiece fixture. Because the auxiliary time of CNC machining center is compressed very short, it can not take too much time to support fixed loading and unloading.

4。 Fixtures should have as few elements and high stiffness as possible.

5。 Try to open the fixture. The space position of clamping elements can be very low, and the installation fixture and tools can not interfere in one step.

6。 Ensure that the parts within the range of spindle travel are processed.

7。 Due to the movement of worktable and rotation movement, fixture design must prevent the space interference of fixture and machine tool.

8。 Try to finish everything in the clamping process. When replacing the clamping point, pay special attention not to damage the positioning accuracy of the replacement clamping point, if necessary, during this process.

9。 The flatness of fixture base, worktable and fixture bottom must be within 0.01-0.02 mm, and the surface roughness should not be greater than ra3.2. CNC CNC lathe is a kind of high-precision and high-efficiency automatic machine tool. The use of CNC lathe can improve the processing efficiency, To create more value, the appearance enterprises of CNC lathe get rid of backward processing technology. The processing process of CNC lathe is similar to that of ordinary lathe. However, due to the clamping and automatic processing of CNC lathe, the following aspects should be paid attention to.

Reasonable selection of cutting parameters

For effective metal cutting, machining materials, cutting tools and cutting conditions are the three main factors. These determine the processing time, tool life and machining quality. Cutting conditions must be selected reasonably for economical and efficient processing methods.

The three elements of cutting conditions: cutting speed, feed and cutting depth directly cause damage. With the increase of cutting speed, the point temperature will rise, resulting in mechanical, chemical and thermal wear. If the cutting speed is increased by 20%, the tool life will be reduced by 1 / 2.

Back feed conditions and tool wear are kept to a minimum. But feeding behind, cutting temperature rise, wear. It is less than the effect of cutting speed. Cutting depth has no effect on cutting speed and feed, small cutting depth, but cutting material in hardened layer will also affect tool life.

According to the user’s processing material, hardness, cutting conditions, material selection, feed and cutting depth, the cutting speed is used.

Based on the selection of the most suitable process conditions, these factors are selected. Regular life and stable wear are the most ideal conditions.

However, in practice, the selection of tool life and tool wear, through machining size, surface quality, noise reduction, heat and so on. Under certain treatment conditions, it is necessary to study according to the actual situation. Difficult to machine materials such as stainless steel, heat-resistant alloy, can use coolant or choose a good rigid blade.

Reasonable selection of cutting tools

1。 Rough rotation, should choose high strength, good durability knife, in order to meet the large car turning, feedback.

2。 The essence of automobile is to select high precision, durable and good cutting tools to ensure the machining accuracy.

3。 Reduce the conversion time and knife convenience, should try to use machine knife and machine clip blade.

Select fixture

4。 General fixture should be selected to clamp workpiece as much as possible, and special fixture should be avoided;

5。 The coincidence of parts positioning datum reduces the positioning error.

Determine the processing route

Machining path is the part of tool path and direction relative to each other in the process of exponential control.

1。 It should be able to meet the requirements of machining accuracy and surface roughness;

2。 Shorten the processing route as far as possible and reduce the idle travel time of the tool.

Computer gong processing – product processing center

Product processing center refers to the processing center used to process products. There are large products and small products here. However, large machine tools are usually used to process molds, and there are a small number of products. Product processing center is the most widely used in the field of CNC machining center, because there are more products than molds. The products of many industries need to be processed by vertical machining center.

The main functions of the equipment are as follows:

  1. Milling, CNC milling machine generally should have three coordinate linkage function, which can carry out linear interpolation and arc interpolation, and automatically control the rotation of the milling cutter relative to the workpiece movement for milling.
  2. Drilling, reaming, reaming, countersinking, boring, etc. can be carried out by using fixed size hole processing tools, or milling cutter can be used to mill holes of different sizes;
  3. Tool compensation function, generally including tool radius compensation function and tool length compensation function.
  4. For the conversion of metric and English units, metric units (mm) and English units (inch) can be selected for programming according to the marking of drawings, so as to adapt to the specific situation of different enterprises.
  5. Absolute coordinate and incremental coordinate programming, the coordinate data in the program can be absolute coordinates or incremental coordinates, so that the data can be calculated or between 20%. The programming is more convenient.
  6. Adjustment of feed speed and spindle speed. The control panel of CNC milling machine is generally equipped with multiple switch of feed speed and spindle speed, which is used to adjust the actual feed speed and actual spindle speed at any time according to the processing status and program setting value during program execution, so as to achieve the best cutting effect. Generally, the feed speed adjustment range is between 0% ~ 150%, and the spindle speed adjustment range is 50% ~ 1.

This machining center is the commonly used equipment in CNC industry. The CNC equipment is composed of mechanical equipment and CNC system. It is an efficient automatic CNC machine tool used to process complex shaped workpieces. This equipment is originally developed from the CNC milling machine, but also in the later application process in the technical aspects of change. Moreover, this equipment is also a highly mechatronic product. After the workpiece is clamped, the CNC system can control the machine tool to automatically select according to different working procedures. In addition, it can automatically change the cutting tool and automatically change the spindle speed and feed rate. In addition, the equipment can also continuously complete drilling and boring Milling, reaming, tapping and other processes, which can greatly reduce the clamping time of the workpiece, as well as the auxiliary process time such as measurement and machine tool adjustment, and the more complex processing shape and higher accuracy requirements in application, as well as good experience in parts with frequent variety change Moreover, the current application equipment can gradually become the most important equipment in the mechanical processing industry,

The supporting parts of machining center mainly refer to machine bed, upright, beam, base and other large parts. Its function is to support parts, bear force and ensure their mutual position. Although the shape, geometric size and material of the support are various, they all satisfy the following points.

  1. The anti vibration property of the supporting part refers to its ability to resist forced vibration and self-excited vibration. Vibration will not only make the machine produce noise, but also affect the processing quality. Therefore, the support should have sufficient vibration resistance and have the required dynamic characteristics. The main factors affecting the vibration resistance of the support are: the stiffness of the support, the natural frequency of the support, the damping of the support, the support condition of the support and the material of the support, etc. in practice, the vibration resistance of the support is often improved by selecting the high damping material, adopting the high damping component, and improving the support condition of the support with the Linjia vibration damping pad.
  2. Stiffness requirements the stiffness of the supporting part refers to the ability of the support to resist deformation under the action of constant load and alternating load. The former is called static stiffness and the latter is dynamic stiffness. The static stiffness depends on the structural stiffness and contact stiffness of the supporting timber body. The dynamic stiffness is not only related to the static stiffness, but also to the damping and natural frequency of the supporting system. The most important factors affecting the stiffness of the support are the material and structure of the support. The stiffness of the support can be improved by using high rigid materials and increasing the elastic modulus of the material; the contact stiffness can be effectively improved by increasing the surface contact area, increasing the preload and improving the surface quality; It is an effective measure to improve the stiffness of supporting parts by adopting reasonable cross-section shape and configuring the stiffeners and stiffeners.
  3. The main factors affecting the thermal deformation of the supporting parts of machining center are: the structure of the support, the heating of the moving parts and the external heat source. The thermal deformation can be reduced by adopting the thermal symmetry structure, isolating the heat source, forced cooling and quick chip removal

Computer gongs processing – Requirements for CNC clamps

CNC milling machine is generally suitable for various types and small and medium-sized batch production. In order to clamp workpieces of different shapes and sizes, the fixture processed by CNC milling machine should be flexible, and the workpieces of various shapes and sizes can be clamped by proper adjustment. The special fixture of CNC milling machine has four functions: positioning, clamping, guiding and tool setting. The CNC machine tool is usually equipped with touch test head, tool presetting instrument and tool setting parts.

The precise positioning accuracy controlled by the program on the CNC machine tool can complete the tool guiding function in the fixture. Therefore, the fixture in NC machining usually does not need the function of orientation and tool setting, only needs the function of positioning and clamping, which can meet the needs of use.

(1) NC machining fixture should be able to use pneumatic, hydraulic, electric and other active clamping equipment to clamp quickly, so as to shorten the auxiliary time and provide the efficiency of NC machining.

(2) CNC milling machine model is used to NC multi-faceted processing. To prevent the fixture layout including the components on the fixture from interfering with the tool motion track, the fixture layout should not hinder the tool from multi-faceted machining of various parts of the workpiece.

(3) The fixture itself should have enough rigidity to adapt to large cutting parameters. Numerical control machining has the characteristics of process convergence. In one clamping of workpiece, it is necessary to carry out rough machining with large cutting force and finish machining to meet the demand of precision at the end of the workpiece. Therefore, the stiffness and clamping force of the fixture should meet the demand of large cutting force.

(4) The positioning of the fixture should be firm, the positioning elements should have high positioning accuracy, and the positioning position should be convenient for chip removal without chip accumulation. If the positioning surface of the workpiece is too small, the technical boss or auxiliary datum can be added.

(5) For the type of CNC milling machine, the minimum clamping deformation shall be ensured for the workpiece with small stiffness,

For example, make the clamping point close to the supporting point and prevent the clamping force effect on the hollow area of the workpiece. When rough machining and finish machining are finished in the same process, if the above methods can not control the workpiece deformation within the range of machining accuracy requirements, the program shall be suspended before finishing, and the operator shall change the clamping force (properly reduced) before finishing after rough machining, so as to reduce the influence of clamping deformation on machining accuracy.

Numerical control milling machine is a kind of machine tool which integrates digital control system on ordinary milling machine, and can carry out milling more accurately under the control of program code. It has the following features:

  1. Parts processing has strong adaptability and flexibility, and can process parts with extremely disordered shape or difficult to control scale, such as mold parts, shell parts, etc;
  2. At present, the pulse equivalent of CNC equipment is usually 0.001mm, and the high-precision CNC system can reach 0.1 μ M. in addition, the CNC machining also avoids the operator’s error;
  3. It can process the parts which are difficult to machine or cannot be processed by machine tools, such as the disordered curve parts described by mathematical model and the three-dimensional curved surface parts;
  4. It can process parts that need to be processed in multiple processes after one clamping and positioning;
  5. With high production efficiency, CNC milling machine usually does not need to use special fixture and other special process equipment. When replacing the workpiece, it only needs to call the processing program stored in the CNC equipment, clamp things and adjust tool data, thus greatly shortening the production cycle. Secondly, CNC milling machine has the functions of milling machine, boring machine and drilling machine, so that the process is highly concentrated and the production power is greatly improved. In addition, the spindle speed and feed speed of CNC milling machine are stepless, so it is helpful to select the best cutting parameters;

What is CNC machine tool

CNC milling machine is the abbreviation of digital control machine tool, which is an automatic machine tool equipped with program control system

The control system can process the program with control code or other symbol instructions logically, decode it, express it with coded number, and input it into CNC device through information carrier. After calculation and processing, the CNC device sends out various control signals to control the action of the machine tool. According to the shape and size required by the drawing, the parts can be processed automatically.

Similarities and differences between machining center and CNC milling machine:

Like CNC milling machine, machining center is also composed of CNC system, servo system, mechanical body, hydraulic system and other parts.

But machining center is not the same as NC milling machine. The biggest difference between machining center and NC milling machine is that machining center has the function of automatic tool exchange. By installing different tools in the tool magazine, they can pass through in one clamping. In addition, the machining range of the two is different. The functions of machining center include milling workpiece, drilling workpiece, setting space, etc The machine can only mill the workpiece. The automatic tool changing device can change the cutting tool on the spindle to realize the functions of drilling, boring, reaming, tapping and grooving.

CNC machine tools, machining centers, is a kind of high precision, high efficiency automatic machine tools. It has a wide range of processing properties, and can process straight line cylinder, oblique line cylinder, circular arc and various threads. It has various compensation functions of linear interpolation and arc interpolation, and has played a good economic effect in the mass production of complex parts.

Five skills of CNC engraving machine

As we all know, engraving skill is an art that has been spread since ancient times, but with the rapid growth of economy in China, it is no longer only relying on hand to complete.

Next into the world of CNC engraving machine.

Skill 1:

The main shaft of CNC engraving machine, as a focus part, is mainly due to rust and blockage, which will cause the machine can not operate normally. The reason is that when we are in bad luck, the coolant in the coolant pipe is still left in it. In addition, the water also contains a large amount of elements. After high temperature, heavy water will gradually form. Heavy water contains a lot of impurities and precipitates After coming down, it will form dirt and form rust and blockage.

Therefore, the surface of motorized spindle should be coated with antirust oil and the cooling water should be changed regularly. And to prevent water temperature too high, but also to ensure the cleanliness of cooling water, if allowed, in case of spindle blockage.

Skill 2:

If the cooling system of the engraving machine is not grounded, the success rate will drop, the cold water head will fall off, and the service life will be greatly reduced. If the environment is severe, even the equipment deployment can not start things.

Skill 3:

If the fans and air ducts are not cleaned up, many smoke and dust inside will not be discharged. At this time, the lenses and laser tubes will also be seriously polluted. Finally, they will oxidize the electronic parts of the machine and cause the war is not good. This is why the response of engraving time is slow.

Skill 4:

Focus mirrors and mirrors should also be checked regularly. Because its frame is easy to heat, if not real-time disposal punishment, will make the appearance of oxidation, a long time will rust. Especially is the use of air pump and air compressor users, but also to regularly check the lens, so as not to cause irreparable place display.

Skill 5:

In order to make the engraving machine connected to the best state, to make its power cooling connection smooth, but also fair, the current should be connected within 50%, otherwise, it will cause the effect of increasing the rate of obstruction.

The most prominent feature of professional CNC carving machine is: professional carving CAD / CAM software and CNC carving machine for professional and strict matching!

When a professional computer (CNC) engraving machine is used for batch processing, the professional engraving software can ensure that the operator can make a plan smoothly and generate a reasonable and efficient processing program; when the data is loaded and the tool is adjusted and started to work, the operator only needs to listen to the cutting sound of the cutter on time to determine whether the tool is worn or not, and to replace the cutter when necessary, which is not necessary When the processing is completed, if it is found that the processing in some areas does not meet the requirements, the operator can use the repair function on the machine to make up for it on site, and a batch of work is completed so fluently. It’s easy to work like this!

The main performance is: tool adjustment is difficult to accurately locate and difficult to repair the deficiencies in the processing! This may be formed: low positioning accuracy of cutting tool affects the accuracy of products, and it is necessary to repeat processing to reduce processing power!

Taking professional carving CAD / CAM software as planning channel — the central computer (CNC) for efficient carving with small cutting tools usually carves out precise and disordered shapes. Its appearance and processing method are different from traditional CNC machining methods. If there is no professional carving CAD / CAM function as support, it is difficult to achieve high efficiency in practical application

Using precision high speed spindle motor

High speed and precision spindle motor features high speed, high precision, low noise, low vibration and high-speed constant power, which ensure that the small tool can obtain high cutting line speed, adhere to high rotation accuracy and stable working shaft system, and can produce satisfied high-speed cutting force.

CNC carving skills based on equal cutting skills

Equal cutting is a cam professional skill for high-speed carving of small tools. No matter how messy the processing area is, this skill can ensure the generation of a stable cutting amount and plan a reasonable carving way. Only the equal cutting method can ensure the efficient carving of small tools in terms of skills.

Safe and stable CNC control skills — the fundamental guarantee of efficient carving of small tools

CNC carving using small cutting tools, single cutting data removal is small, in order to improve the processing power, it is necessary to improve the average speed of feed, and can safely and quickly back. The safe and stable CNC control skills of the fine carving CNC system ensure that the small tool can receive stable cutting force and maintain a high and stable average feed speed in carving, so that the high power of small tool machining can be completed.

Stable mechanical structure — a solid channel for high speed carving with small cutting tools

The mechanical structure of the engraving machine is composed of all castings, and the moving guide rail is directly installed on the stable structure. Under the guarantee of high-precision machining parts and precise installation skills, it can ensure that the fine carving machine has good movement stability, low motion noise, provides a stable operation channel for high-speed machining of small cutting tools, and provides the completion of the motion method of “high-speed feed and quick return” A solid guarantee.

Useful function of repairing unexpected condition — to ensure that the machining of small tools is true and efficient

Because CNC engraving uses small tools to process, the unexpected situation that small tools wear quickly and break easily can not be completely changed. Therefore, the computer engraving machine is required to have a useful function of repairing unexpected conditions. The operator can repair the carving errors directly in the operation channel. Otherwise, once an accident occurs, it needs to be reprogrammed or processed from scratch, which will result in a lot of meaningless repetitive work The processing power is reduced.

Computer gong processing – tapping problem

Drilling, milling and tapping center machine is a kind of machining equipment which has different specifications of through-hole or blind hole in the shell, equipment end face, nut and other tools of CNC machine tool, and the thread, screw or thread are machined on the inner side of parts. Let’s first understand the characteristics of drilling and milling center machine.

The drilling, milling and tapping center machine is very simple when adjusting the model. The automatic reverse device can freely adjust the working stroke of the drilling and milling tapping center machine. The processing workpieces with shallow holes and holes can be easily adjusted. In the double installation device, the screw tap can be prevented from damage, and the spindle can be back and forth and up and down. The double safety clutch is specially designed for the advance and retreat of the cutter. The spindle can stop automatically and the tool will not be damaged by the reversing tool withdrawal. The gear of drilling and milling center machine matches with the pitch between the spindle and the spindle to promote complete matching, vertical stability, accuracy, and high precision. When the screw taps, it can move forward and backward without output. At the same time, it can be configured with multi axis synchronous processing, and the production efficiency will be greatly improved

It can also reduce and save labor: drilling, milling and tapping center machine combines tapping and stamping of parts into a process, which can be fully automated, thus saving labor costs. It can also reduce adverse effects. Accurate positioning of drilling and milling center machine can reduce the damage probability of taps. At the same time, it can also reduce the accurate positioning of drilling and milling center machine, and provide the probability of waste products caused by errors. So what are the common problems in the use of drilling milling tapping center machine? How to solve this problem? Well, today’s editor will help you solve these problems.

  1. Breaking of drill tap

Solutions: when the tap of drilling and milling center machine is broken, the diameter of thread bottom hole should be correctly selected; the drilling depth of grinding edge angle or spiral groove tap should reach the specified standard; the cutting speed should be appropriately reduced and selected according to the standard; when tapping, correct the tap and bottom hole to ensure its coaxiality meet the requirements, and select floating tapping chuck; increase the tap The front angle, shorten the length of the cutting cone; ensure that the hardness of the workpiece meets the requirements, select the safety collet; the anti County tap wear should be replaced in time.

  1. Tap tooth breakage

Solution: tap tooth chipping, properly reduce the tap front angle; appropriately increase the length of the cutting tap; reduce the hardness and replace the tap in time. If the tap is worn too fast, the cutting speed should be reduced properly; the front angle of the tap should be reduced to lengthen the length of the cutting cone; the cutting fluid with good lubricity should be selected; the workpiece to be machined should be properly heat treated; and the tap should be properly sharpened.

  1. Excessive pitch diameter of thread

Solutions: if the pitch diameter of the thread is too large, select the tap pitch diameter with reasonable accuracy level; select the appropriate cutting fluid and reduce the cutting speed appropriately; correct the coaxiality of the tap and the bottom hole of the thread when drilling and milling the tapping center machine, and use the floating chuck; appropriately reduce the front angle and the back angle of the cutting tap; remove the burr generated by the grinding tap and appropriately increase the length of the cutting tap.

  1. Too small pitch diameter of thread

In addition, it is necessary to increase the cutting accuracy of the tap and to select the proper cutting angle of the tap.

  1. The surface roughness of thread is too large

Solution: if the surface roughness value of thread is too large, properly increase the front angle of the tap to reduce the cutting angle; conduct heat treatment to properly improve the hardness of the workpiece to ensure that there is a low surface roughness value on the front cutter surface of the tap; select the cutting fluid with good lubrication; appropriately reduce the cutting speed; replace the worn tap for the drilling and milling center machine.

Drilling, milling and tapping center machine is a kind of metal cutting equipment, of course, it can also drill holes, but from this name, we can see that it is also very aggressive. Well, after a simple understanding of the drilling and milling center machine, the next step is to analyze the current situation of the overall market.

The function of drilling, milling and tapping center machine is to drill the hole and tap together. From here, we can see that one of its characteristics is high efficiency, because it combines the two processes and completes it at one time.

In the absence of drilling and milling tapping center machine, we need to work together with drilling machine, lathe or manual wire drilling tools to complete what it has done now

CNC computer gongs hobbing

In the process of equipment design and manufacturing, manual calculation method was used, which was not only inefficient, but also prone to errors, and modern design methods could not be used, especially for local conjugate meshing gears such as spiral bevel gears and gears. Tooth design, process parameter selection, tooth contact analysis and stress-strain analysis are closely related, Such as mechanical optimization design, finite element analysis and Simulation of machining process, perfect application software and machine tools have become the necessary conditions for modern enterprise product development.

Here, we will introduce typical gear and metal materials.

Typical gear materials:

S45C (mechanical structure and carbon steel): S45C 0.45% carbon, medium carbon steel (steel). Gear, bevel gear, rack, bevel gear, worm gear use this material more.

SCM415 (chromium molybdenum alloy steel): low carbon alloy steel (C = 0.15%) represents the material. Generally speaking, after carburizing and quenching, the strength of the material after heat treatment is higher than that of S45C scm440. The service surface hardness is about 55 to 60.

Sus303 (Cr – 8 nickel steel stainless steel: 15): stainless steel, as the name implies, is not easy to rust steel (stainless steel). The austenitic stainless steel of the system is basically non-magnetic; the stainless steel gear is mainly used in the machinery which needs to avoid rusting, similar to sus303 and SUS304 stainless steel, and it is more corrosion resistant than sus303.

Casting copper alloy, casting copper alloy is the main material for manufacturing worm gear. Usually there is a phosphor bronze casting (cac502), aluminum bronze (cac702) and other meshing hands. Most of the materials used for worm meshing are S45C / scm440 / SCM415 steel, etc. Use different materials to prevent worm gear worm gear meshing tooth surface sliding agglutination and excessive wear due to etc.

Above is our original gear, typical gear selection material. CNC hobbing machine and ordinary lathe CNC lathe processing, but because of fixture, CNC hobbing, large and small modulus gear processing continuous automatic processing to complete all processes, should pay attention to the following aspects.

Choose reasonable cutting parameters

For metal processing, high efficiency, processing materials, cutting tools and cutting conditions are the three main factors. These determine the processing time, tool life and machining quality. The economical and effective treatment is to choose the cutting condition reasonably. Cutting conditions are three elements: cutting speed, cutting depth of the tool direct damage. With the increase of cutting speed, the temperature will rise, there are mechanical wear, chemical and thermal. If the cutting speed is increased by 20%, the tool life will be reduced by 1 / 2.

Back feed conditions and tool wear are kept to a minimum. But feeding is big, cutting temperature, wear. Large module gear processing. It is affected by the cutting speed of the tool. Although the cutting depth of the tool cutting speed and feed has no big impact, but in a small cutting depth and cutting, cutting material hardening layer, will also affect the tool life.

However, in practice, the selection of tool life, tool wear, machining size change, surface quality, noise, heat and related treatment is reduced. It is necessary to study according to the actual situation. Stainless steel and heat resistant alloy and other hard small modulus gear processing materials, can choose coolant or rigid blade.

Choosing the right tool for CNC gear hobbing

  1. Thick selection of high strength, good durability tools to meet the rough turning depth, feed requirements.
  2. Automobile, high selection accuracy, good tool durability, to ensure the machining accuracy requirements.
  3. In order to reduce the conversion time and tool convenience, machine tools and blades should be used as much as possible.

Selection of fixture for CNC gear hobbing

  1. In the special points of NC gear hobbing, general fixture should be used as far as possible, and special fixture should be avoided;
  2. The coincidence of parts positioning datum reduces the positioning error.

Determination of machining route for special points of NC Gear Hobbing

  1. The special points of NC Hobbing should be able to meet the requirements of machining accuracy and surface roughness;
  2. CNC gear hobbing processing special place should try to shorten this process, reduce the travel time of the tool.

Contact machining allowance of machining line

At present, the conditions used are not in line with the popular CNC lathe, the edge should be too rough, especially for forging, casting hard pad placed in the ordinary lathe. If you have to use CNC lathe processing, pay attention to the flexible arrangement of the program. The following points: first, use the hydraulic clamping nut wrench to clamp the hydraulic cylinder, delete the slide, take out the spindle, and then manually chuck the fixing screw, which can unload the chuck.

Effective and reasonable turning

The comprehensive index of G200 turning center processing unit is modular, with high-power dual spindle and four axis linkage function, so as to further shorten the processing time. Work axis clamping means other concepts, on the other hand, the product uses an integrated intelligent processing unit to automatically clamp the workpiece position and treatment. In other words, automatic clamping does not affect other spindle machining, and a function can shorten processing time by about 10%.

In order to improve the accuracy and production efficiency

With the improvement of productivity level, users also have high precision. The tolerance of workpiece after machining by G200 turning center and cold start is + / – 6 mm. In the process of machining, it is usually 2 mm. Therefore, index company provides customers with complete solutions with high precision, high efficiency and high precision. It also provides solutions, which requires careful selection of spindle, bearing and other characteristics

Difference between fast wire and slow wire in NC WEDM

Fast wire in the professional terminology is called: high speed reciprocating wire EDM wire cutting machine

Slow wire is called low speed unidirectional WEDM in professional terms

The wire speed of reciprocating WEDM is 6-12 m / s. The biggest characteristic of the product is that it has 1.5 degree taper cutting function, and the processing thickness can be more than 1000 mm. It is used in all kinds of medium and low-grade mold manufacturing and special parts processing, and has become one of the most widely used machines in China’s CNC machine tools. However, due to the fact that the reciprocating WEDM machine can not implement constant tension control on the electrode wire, and the computer gong processing, the electrode wire jitters greatly and is easy to break in the process of processing. Because the electric grade wire is used repeatedly, it will cause electrode wire loss, machining accuracy and surface quality reduction.

The electrode wire of low-speed WEDM uses copper wire as tool electrode and generally moves unidirectionally at the speed of less than 0.2m/s. A pulse voltage of 60-300v is applied between the copper wire and the processed materials such as copper, steel or superhard alloy, and a gap of 5-50um is maintained. The gap is filled with insulating medium such as deionized water (close to distilled water), which causes spark discharge between the electrode and the workpiece This is consumed and corroded, and numerous small pits are etched on the surface of the workpiece. Through the monitoring and control of NC control and the execution of servo mechanism, the discharge phenomenon is uniform and consistent during the machining of mechanical parts, so that the processed products can be processed into products with the required size and shape accuracy. At present, the accuracy is up to 0.001mm, and the surface quality is close to the grinding level. The electrode wire is no longer used after discharge, and no resistance anti electrolysis power supply is adopted. Generally, it is equipped with automatic threading and constant tension device. It has the advantages of stable, uniform, small jitter, high machining accuracy and good surface quality, but it is not suitable to process large thickness workpieces. Due to the precise structure of the machine tool, high technology content, high price of the machine tool, the use cost is also high.

It can form plastic parts with deep holes and complex shapes.

Under heat and pressure, the plastic can be heated quickly and evenly through the mold pouring system to ensure short hardening time.

The dimensional accuracy of plastic parts is easy to ensure and the flash of parting surface is thin. It is difficult to extrude plastics with fluidity less than 80mm. The forming pressure is higher than that of the glue pressing method. The consumption of plastic must be increased (pouring part).

Injection method: the granular or powdered plastic is heated and melted into the flowing state in the barrel of the injection machine, and then the whole cavity is filled with a narrow nozzle and the pouring system of the mold with a very high pressure and poor speed. After a certain period of setting, the mold is opened, and the plastic parts can be taken out from the mold. The characteristics of injection molding: short forming cycle, easy to realize. The dimensional accuracy of plastic parts is easy to guarantee.

The mold is usually designed to be fixed. When there are many metal inserts in the plastic parts, the installation of the inserts is more difficult. Plastic mould can be divided into thermosetting plastic pressing mould, thermosetting plastic extruding mould, thermosetting plastic injection mould and thermoplastic injection mould.

According to the form of material cavity, thermosetting plastic pressing mold can be divided into:

(a) Open die, that is, the cavity is the feeding cavity;

(b) Semi closed die, that is, the cross section of the feeding chamber;

(c) The feeding cavity is the continuous part of the cavity, and the forming pressure is completely transmitted to the pressed plastic parts through the upper die.

According to the structure, it can be divided into:

(a) Mobile press mold,

(b) Fixed press mold.

Factors affecting the quality of EDM

There are many factors affecting the processing quality, which are related to the selection of electrode materials, electrode manufacturing, electrode clamping and alignment, the selection of machining standards and the appropriateness of operation process. To prevent the production of waste products, the following should be noted.

Correct selection of electrode materials

In cavity machining, graphite is a common electrode material. However, due to the variety of graphite, not all graphite materials can be used as electrode materials for EDM. Special graphite with high strength, high density and high purity should be used. Copper electrode is often used in precision. One is: the discharge end of EDM, which is used to process cavity, lettering, etc., and is usually made into the required shape. The material is graphite, copper or aluminum (rare). The other is: the discharge end of WEDM is made of molybdenum wire. Its principle is to apply high-frequency and high-voltage to the discharge end through the electric control part. When the electrode (molybdenum wire) contacts with the grounding end (workpiece), it will form high-frequency ignition and generate high temperature, which will quickly dissolve the workpiece surface (a very small gap) in contact with molybdenum wire, which is called wire cutting.

The so-called multi electrode machining refers to the parts to be processed with high precision, and the discharge parts should be discharged twice or more. In the early stage, it is rough discharge machining with larger translation, and the later is fine discharge machining with small translation.