July 2019 – Page 79 – CNC Machining & Turning, Milling, Metal parts

CNC Milling Machine Parts Factory

CNC Milling Machine Parts Factory, Precision CNC Milling Machine Processing, Precision Boring Machine Processing, Reliable Strength, Reliable Credit, Hardware Machinery Processing, Professional Team, Advanced Technology, Complete Equipment, Honesty First, Quality Assurance.

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How to deal with the situation of vibration tool in CNC Machining

1. Use sharp blades to reduce the cutting force of CNC milling machine. Machine clip blades are divided into coated and non-coated blades. Non-coated blades are usually sharper than coated blades, because if the blades are to be coated, they must be passivated (ER treatment), because the sharp edge will affect the bonding strength of the coating at the edge.

2. When the cutting depth is fixed, the cutting force can be reduced by using small arc radius of the tool tip. Especially the radial cutting force, which is the main cause of vibration of slender rod tools or workpieces. Whether it is impact or milling. At the same cutting depth, the greater the radius of the tool tip arc. The vibration tendency of slender cutter rod is greater.

3. When choosing the cutting depth, avoid that the cutting depth is equal to the radius of the tool tip arc.

4. For the key cutting of sharp cutter of slender tool rod or the cylindrical turning of slender axle, the tool with 90 degree principal deviation angle is beneficial to vibration elimination. Whether it is turning slender axle or key hole of slender tool rod with cylindrical turning tool, it is always 90 degrees, and the radial cutting force produced by the tool with main deviation angle is the smallest. At the same time, the blade edge produces the largest axial force.

5. For the slender rod milling cutter, the circular blade milling cutter is most conducive to vibration reduction. Contrary to the agitator, the greater the radial cutting force, the greater the vibration of several tool bars. Therefore, in the face milling of deep-hole cavity of die, the NC milling machine usually uses 45 degree principal deviation angle milling cutter, if the cutting depth is less than Imm. Round blade milling cutter or ball cutter are often used.

6. When CNC milling machine uses slender rod end milling cutter to milling deep cavity, insertion milling is often used. Plug milling means that the cutter enters the cutter axially like a drill bit. When milling deep cavity, the diameter of the long rod is usually greater than three times the diameter of the cutter rod. We recommend the use of the axial feed cutter. However, the edge of the end milling cutter blade has a radial cutting edge with a certain width. The tool supplier has technical data to prove that the cutter has the maximum cutting edge width during insertion milling.

7. Vibration in milling of thin-walled workpieces is entirely caused by workpieces, which are called box or bowl parts. Because the vibration comes from the workpiece itself, it is mainly to improve the grip of the workpiece when processing the milling of such parts.

8. When boring the inner hole, the smaller the blade edge angle, the better. In this way, the secondary deflection angle is very large, the flutter contact area between the secondary cutting edge and the machined surface is small, and the flutter is difficult to turn into vibration. The extrusion opportunity of the secondary cutting edge is also small.

9. If the face milling cutter adopts unequal spacing milling cutter, the milling vibration can be reduced. Here “teeth” refer to blades. Face milling cutters of the same diameter (e.g. 100mm). If the three cutting elements are equal, the cutter head with five blades will surely produce 50% less milling force than the cutter head with ten blades.

10. Use blades with positive front and large rear angles. It is equipped with a light chip breaker. Such a blade has the smallest wedge angle in filing or milling, and of course it cuts lightly.

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General Knowledge of CNC Machining

CNC Truning repetitive parts put into production: the use of CNC grinder process preparation time comrade-in-arms higher proportion. For example, preparation of process analysis, programming, adjustment and trial-cutting of Parts’first parts, etc., the sum of these comprehensive working hours is often tens to hundreds of times of the working hours of Parts’ single-part processing, but the working contents of these CNC lathes can be saved and reused, so when a part is successfully manufactured on a CNC grinder and put into production again and again. The production cycle is greatly reduced, the cost is reduced, and good economic benefits can be obtained.

It is required that the key parts of medium and small batches produced with high quality and high efficiency should be processed: CNC grinding machine can realize high precision, high quality and high efficiency grinding under the control of computer. Compared with the special grinding machine, it can save a lot of special process equipment, has a strong flexible manufacturing ability and obtains better economic benefits. Compared with ordinary grinding machine, it can eliminate many human interference factors in the long process of complex processing, and has good accuracy consistency and interchangeability of parts, and high processing efficiency.

The parts processed by CNC Machine should conform to the technological characteristics that can give full play to the multi-process centralized processing of CNC grinder. When CNC grinder processes parts, the situation of grinding wheel cutting workpiece is exactly the same as that of corresponding non-CNC grinder, but it can carry out some compound processing with the requirement of processing accuracy, such as in the grinding range. Ordinary grinding machine is mainly used to grind cylindrical surface, conical surface of circular NC lathe or end face of stepped shoulder. In addition to NC cylindrical grinding machine, it can also grind ring surface, as well as all kinds of complex combination surface.

The processing batch of parts should be larger than that of ordinary lathe batch CNC lathe in non-CNC grinder processing, small batch parts. For various reasons, the pure cutting time only accounts for 10%-30% of the actual working hours. When processing on CNC grinder with multi-process centralization such as grinding processing center, this proportion may rise to 70%-80%. But preparing to adjust the working hours is often much longer, so it will become uneconomical when the batch size of parts is too small.

Considering the processing of some special parts processed by CNC NC lathe, although some parts are processed in small batches, ordinary lathes have complex shapes, high quality and good interchangeability, which can not meet the above requirements on non-CNC grinders, and can only be processed on CNC grinders, such as parabola, cycloidal cams and special ones. The mirror of the surface, etc.

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How to Maintain CNC Machining Machine

The key to preventive maintenance of CNC machine tools is to strengthen daily maintenance. The main maintenance work includes the following: daily inspection, weekly inspection, monthly inspection, quarterly inspection and half-year inspection. The preventive maintenance of CNC machine tools is as follows:

1. Daily Inspection of CNC Machining Machine Tools

Its main projects include hydraulic system, spindle lubrication system, guide rail lubrication system, cooling system, air pressure system. Daily inspection is based on the normal conditions of each system to be tested. For example, when testing the process of the spindle lubrication system, the power supply lamp should be on, the oil pressure pump should be running normally, and if the power supply lamp is not on, the spindle should be kept in a stop state and contacted with the mechanical engineer. Maintenance.

2. Weekly Inspection of CNC Machining Machine Tools

Its main items include machine tool parts, spindle lubrication system, which should be checked correctly every week, especially for machine tool parts to remove iron chips and carry out external debris cleaning.

3. Monthly Inspection of CNC Machining Machine Tools

Mainly check the power supply and air dryer. The power supply voltage is rated at 180V-220V under normal conditions and the frequency is 50Hz. If there is any abnormality, it should be measured and adjusted. The air dryer should be disassembled once a month and then cleaned and assembled.

4. Quarterly Inspection of CNC Machining Machine Tools

Quarterly inspection should be carried out mainly from three aspects: machine tool bed, hydraulic system and spindle lubrication system. For example, when inspecting the machine tool bed, it mainly depends on whether the accuracy of the machine tool and the level of the machine tool meet the requirements of the manual. If there are any problems, we should contact the mechanical engineer immediately. When inspecting the hydraulic system and the main shaft lubrication system, if there are any problems, the new oil 6oL and 20L should be replaced and cleaned separately.

5. CNC Machining CNC Machine Tool Half-year Inspection

Half a year later, the hydraulic system, spindle lubrication system and X-axis of the machine tool should be inspected. If there is a problem, the new oil should be replaced and then the cleaning work should be carried out. After knowing and mastering the knowledge of preventive maintenance in an all-round way, we must have a better understanding and necessary mastery of the causes and treatment of abnormal phenomena in oil pressure system. For example, when the phenomenon of oil pump not injecting oil, abnormal pressure, noise and so on occurs, we should know what the main reasons are and what the corresponding solutions are.

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How to Guarantee the Precision of CNC Machining

In the machining center, the CNC lathe generally needs to use more than one tool, so we should arrange the processing order reasonably, which is conducive to improving the processing accuracy, processing power and economic benefits. When arranging the NC lathe processing order, we should follow the general technological principles of “base plane first”, “face first, face first”, “primary and secondary” and “roughness first, refinement later”.

The selection of positioning datum directly affects the arrangement of processing order. As a positioning datum, the surface should be processed well in order to provide a reliable positioning datum for other processing areas. Because the surface machined by this process after selecting the positioning datum may be the positioning datum of the next process, after the determination of the positioning datum of each process, the roughly second order of the whole process can be deduced step by step from the finishing process after all.

When deciding the processing order of NC lathe, it is necessary to clarify whether the parts should be pre-processed before processing. Prefabrication usually ends with a general machine tool. If the precision of the blank is higher, the positioning is more reliable, or the processing margin is sufficient and uniform, it can be processed directly on the processing center instead of pre-processing. At this time, according to the accuracy of rough benchmark, we should consider the difference of the process of machining center, so one process or several dividend processes can be completed.

When CNC lathe processes parts, it is difficult to guarantee the standard between the machined and non-machined surfaces, which is the same as CNC milling. Therefore, even if the right and wrong processing surface is required by the drawing, the appropriate margin must be added to the non-processing surface when making the blank, so as to ensure that the standard between the non-processing surface and the processing surface meets the drawing requirements in the machining center.

Similarly, if there is a standard requirement between the pre-fabricated surface before CNC lathe processing and the faceted surface processed by CNC machining center, a certain amount of processing allowance should be left during pre-fabrication, and all processing contents including pre-faceted surface should be finished in a clamp of the machining center.

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Today, we will introduce the precautions for CNC Machining:

When choosing a knife point, the knife path can be laid at any designated height and position. When the first knife is first processed, the amount of knife eaten is often large, which can easily lead to broken knives and bullet knives. At this time, the lower knife position can be roughened or the first layer of the lower knife can be empty, and the knife can be laid outside the material as far as possible. This problem must be noticed.

2. Knife grabbing, marble knife, tool dropping, large feed volume, long clamping length and small tool diameter often occur. When the corner radius and tool radius are in the same position, inaccurate shape and size are easy to occur. Knife grabbing is called knife grabbing, which can be solved by layering and clearing the angle with a smaller diameter knife, and then changing the smooth side of the larger knife. Definitely. When the depth is low and large, it can be processed by layers.

3. Overcut inspection and overcut are common problems, which should be paid special attention to. The solution is to simulate the tool path once and check it repeatedly from various angles of view. The tool path without inspection is not allowed to be machined. In profile milling, inappropriate selection of cutter point will lead to over-cutting, which can be avoided by changing the cutter point.

The above attention about CNC Machining is introduced here, I hope it will be helpful to you.

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The fault forms of CNC machining center servo system include alarm light on speed unit, fuse and jump switch for various protection. The meaning of alarm light varies with the design of speed control unit. Generally, there are the following kinds:

1. High current causes machine tool alarm. In general, there are two possibilities for high current alarm, that is, the damage of power drive components in NC speed control unit of machining center and the high current alarm caused by short circuit.

2. High voltage will also lead to machine tool alarm. There are three kinds of situations where high voltage alarm occurs. It may be that the CNC input voltage of the machining center exceeds 10% of the rated value, or the insulation performance of the servo motor decreases, or the high voltage caused by the circuit of the speed control unit of the machining center.

3. Too low voltage leads to machine tool alarm. The probability of this happening in the machining center is very small. It may be that the input voltage is lower than 85% of the rated value, or the power connection is not good.

4. Feedback line break of detection speed leads to alarm, which is an error alarm, because the airport is not a problem, and there are problems in the detection and feedback system. Most of these alarms are caused by speed feedback line break of CNC servo motor in machining center or bad contact of its detection and feedback line.

5. Protective switch start alarm. Protective switch is a kind of device to protect machine tools. For example, high voltage will burn some components and other emergency measures that machine tools can not control. When encountering these situations, the protective switch will start to avoid unnecessary component damage, similar to safety stop and so on.

6. Overload alarm, the causes of overload alarm are abnormal load of CNC machine in machining center, or too low upper limit of motor current in speed control unit. Permanent magnet shedding on permanent magnet motor can also cause overload alarm. If the CNC motor without brake is idle, it is hard to rotate by hand or to rotate the axis, that means permanent magnet shedding completely.

7. Fuse burning or circuit breaker tripping on CNC speed control unit of CNC machining center.

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Generally CNC Machining usually refers to precise machining controlled by computer digitally, CNC Machining lathe, CNC Machining milling machine, CNC Machining boring and milling machine, etc. CNC, also known as computer gongs, CNCCH or CNC machine tools, is actually a term used in Hong Kong. Later, it was introduced into the Pearl River Delta of the mainland. In fact, it is a CNC milling machine. In Guangzhou, Jiangsu, Zhejiang and Shanghai, CNC machining center is a new type of processing technology. Its main task is to compile processing procedures, which will be the original manual work. Turn to computer programming. Of course, there is a need for manual processing experience.

CNC machining has the following advantages:

The number of tooling is greatly reduced, and complex tooling is not needed to process parts with complex shapes. If you want to change the shape and size of the parts, you only need to modify the parts processing procedures, which is suitable for the development and modification of new products.

The processing quality is stable, the processing accuracy is high, and the repetition accuracy is high, which meets the processing requirements of aircraft.

In the case of multi-variety and small batch production, the production efficiency is higher, the time of production preparation, machine tool adjustment and process inspection can be reduced, and the cutting time can be reduced by using the best cutting quantity.

It can process complex profiles which are difficult to be machined by conventional methods, and even some parts which can not be observed.

This is the end of the above introduction about CNC processing. I hope it will be helpful to you.