Machinery industry – Page 91 – CNC Machining & Turning, Milling, Metal parts

How to choose the CNC processing center

(1) the stiffness of the machining center
Because the rigidity of the machining center will directly affect the production efficiency and the machining precision of the machine tool, the machining speed of the machining center is much higher than that of the ordinary machine tool, and the motor power is higher than the common machine tool with the same specification, so the stiffness of its structure design is far higher than that of the ordinary machine tool. Orders can be checked according to the technological requirements, allowable torque, power, axial force and maximum feed force, according to the manufacturer’s numerical value. In order to obtain the high rigidity of machine tools, it is often not limited to the size of the parts, but the machine tool with 1 or 2 sizes relative to the size of the parts is selected.
(2) the machining accuracy of the machining center
Machining accuracy will directly affect the quality of products. Many people will directly affect buyers’ decisions when they question the accuracy of machine tools. Attention should be paid to the two different concepts of machining accuracy and machine tool accuracy. It is wrong to regard the location accuracy of the manufacturer’s sample or the product certificate as the machining accuracy of the machine tool. The precision of the position of the sample or the certificate is the precision of the machine tool itself, and the machining precision is the sum of the errors produced by various factors of the whole process system including the error allowed by the machine tool itself. In the selection, reference can be made to the evaluation method of process capability KP as the basis of accuracy selection. Generally speaking, the calculation result should be greater than 1.33.
(3) selection of CNC system in machining center
CNC system is the core of the machining center operation. CNC functions are divided into basic functions and selection functions. The basic function is provided, and the choice function is only provided when the user chooses these functions. The function of the CNC system must be selected according to the performance requirements of the machine tool. In order to order the function, we should not only set the functions needed, but also avoid the loss of the use rate, and also pay attention to the relevance between the functions. In the numerical control system that can be selected, the performance is very different. We should choose according to needs and not unilaterally pursue high targets, so as not to cause waste. When selecting a number of machine tools, it is possible to use the same manufacturer’s numerical control system as much as possible, so that operation, programming and maintenance can be more convenient.
(4) the number of coordinate axes and the number of linkage axes
The number of coordinate axes and the number of linkage axes should meet the requirements of typical workpiece processing. The number of coordinate axes is also one of the marks of machine tool grade. Under normal circumstances, with the manufacturer, the same specifications, the same accuracy of machine tools, add a standard axis, the cost will increase by about 35%. Although increasing the number of axes can enhance the function of machine tools, we must pay attention to the technological requirements and capital balance.
(5) the automatic knife exchange device and the capacity of the knife library
The selection of automatic tool changer mainly considers the time and reliability of tool changer. Short switching time can improve the productivity, but the changing of the knife time is short, the common tool changing device has complex structure, high failure rate and high cost. Too much emphasis on changing the knife time will increase the cost and increase the failure rate. According to statistics, about 50% of the faults in the machining center are related to the automatic knife exchange device. Therefore, the automatic tool changing device with high reliability is chosen to reduce the failure rate and the cost of the whole machine, on the premise of meeting the requirements. The working quality and tool magazine capacity of automatic tool changer will directly affect the performance and quality of the machining center. The capacity of tool magazine is to meet the needs of a complex machining part for cutting tools.

GFRP grille cutting method

Introduction of GFRP grille cutting method:
For the installation of grille, we must first do the work of grille cutting.
1. according to the size and installation requirements, the grid is reasonably cut and processed to maximize economic efficiency without affecting the internal performance of the grille. The cutting face must be coated with resin to ensure that its decay resistance is not affected.
A. cutting:
Linear cutting: FRP grille can be cut on the spot with ceramic disc or emery disc cutter, or even ordinary hacksaw blade.
Curve cutting: grille openings, arc and other arc cutting can be installed with metal cutting blades electric saw or hacksaw.
B. drilling:
Holes above 12mm can be drilled with regular drill drills.
Small holes can be machined by hand held electric hole machining tools or general electric drill.
C. grinding:
It can be polished by hand angle polisher, grinding wheel, ordinary file and sandpaper.
Note: A. This material cannot be turned and tapped.
B. arbitrary cutting will not change the mechanical properties of the grille, but will not cause any other consequences.
2. security measures:
Before cutting, operating workers should wear protective glasses and masks to prevent objects from splashing into the eyes and reduce dust inhalation; wear gloves and work clothes to prevent dust from entering the skin; choose a well ventilated and bright spot for cutting; before cutting, all electric tools should be checked to see if all electric tools are complete.

Common quality problems and main reasons of CNC machine bearings

In assembling the bearing of the CNC machine tool, the load should be preloaded, so the original clearance will be eliminated after the bearing is installed. Then it is very important to say that the contact angle and precision of the CNC machine tool bearing are very important. Therefore, when installing bearings, it is necessary to ensure that the contact angles are qualified, while ensuring the actual width of the angular contact ball bearings to meet the requirements. Failure of bearings during operation is a common occurrence, so there is no need to make a fuss. There is a failure, and the key is to judge and deal with it.

Next, we analyze the common quality problems and causes of CNC machine tools bearings.

1. Improper installation

1, when brute force is installed, direct bearing with hammers will cause the most damage to the bearing, which is the main reason for the deformation. This is very common in some small machine tool factories. When installing bearings, professional bearing mounting tools are used to avoid this.

2, installation is not in place, installation deviation or not installed to the bearing position, resulting in bearing clearance is too small. The inner and outer circles are not in the same rotating center, causing different concentricity.

Suggestion: choose proper or professional bearing installation tools and install them with special instruments.

Two. Poor lubrication

According to investigation, poor lubrication is one of the main reasons for premature bearing damage. The main reasons include: untimely injection of lubricants or lubricants; lubricants or lubricants not added in place; lubricants or lubricants improper selection; improper lubrication and so on.

Suggestion: choose the right lubricant or lubricating oil and use the correct way of lubricating filling.

Three. Pollution

Pollution also leads to premature damage to the bearing. Pollution means that dust and metal chips enter the bearing. The main reasons include: prematurely opening the bearing packaging before use, causing pollution, the working environment is not clean, causing pollution, the working environment of the bearing is not clean, and the working medium is polluted. All spindle assembly is done in constant temperature cleanroom, thereby avoiding bearing contamination.

Suggestion: it is best not to disassemble the packing of the bearing before use; keep the installation environment clean, clean the bearings to use, and strengthen the sealing device of the bearing.

Four. Fatigue

Fatigue damage is a common way of bearing damage. The common causes of fatigue damage may be that the bearings are overloaded over a long period of time, not timely maintenance, improper maintenance, and equipment aging.

Five, the quality of the bearing

The quality of bearing itself is directly related to the service life. Our company uses all imported bearings or domestic brand lines to avoid this problem.

Unit maintenance

Class a maintenance
1. Daily:
1) check the daily work of the generator.
2) check generator: Oil plane and coolant plane.
3) whether the generator is damaged or leaked, and whether the belt is loose or worn.
Two. Every week:
1) repeat a daily a class examination.
2) check the air cleaner, clean or replace the air cleaner core.
3) release the fuel tank and the water or sediment in the fuel filter.
4) check the water filter.
5) check the starting battery.
6) start the generator and check if there is any effect.
7) use the air gun and the radiator at the front and rear ends of the water cooler.
B maintenance
1) repeat a class a daily and weekly examination.
2) replace the generator oil. (the oil replacement period is 250 hours or one month)
3) change the oil filter. (oil filter cartridge replacement period is 250 hours or one month).
4) replace the filter cartridge of the fuel filter. (the replacement period is 250 hours or a month)
5) replace the coolant or check the coolant. (the replacement period of the water filter element is 250-300 hours, plus in the cooling system.
Injection of supplemental coolant DCA)
6) clean or replace the air filter. (air filter replacement cycle is 500-600 hours)
C maintenance
1) replace diesel filters, oil filters, water filters, and replace water and oil in tanks.
2) adjust the tightness of the fan belt.
3) check the turbocharger.
4) dismantling, checking and cleaning PT pumps and actuators.
5) dismantle the cover of the rocker chamber and check the T-shaped pressure plate, valve guide and intake and exhaust valves.
6) adjust the lift of the nozzle and adjust the gap between the valve.
7) check the charging generator.
8) check radiator radiator and wash radiator external radiator.
9) add the tank inside the water tank and clean the inside of the water tank.
10) check the diesel engine sensor and connecting wire.
11) check the diesel engine instrument box.

What are the structural features of the hot air blowe

Generally speaking, when the hot air machine is produced, it is important to take into account the nature of the power supply. It has a certain influence on the insulation structure of the variable frequency machine, the vibration of the motor, the noise and even the method of cooling when the machine works, so the problems to be paid attention to are:

In the motor device of the hot air machine, many of them are insulators, because the heat fan is generating electricity in the process of working, and the insulation needs different levels. In the case of different levels of insulator, especially the coil, the higher the resistance and the resistance voltage ability is, so that it can run smoothly.

Many hot air machines will produce vibration and noise when they work, which is related to incomplete structure of the engine. Sometimes the lack of parts in the engine can also cause some vibration and noise when the hot air fan is running, and the overall performance of the engine is good, and the fan’s turn can be improved. It is also good to avoid vibration caused by normal working frequency.

The cooling mode of the motor after working is a special feature of the heat fan device. After the motor is heated for a long time, the equipment inside the general hot air machine will be cooled automatically, and the air vent is opened to cool it, and the good heat dissipation can be kept to protect the whole hot fan. This way is to let the motor alone. To start the machine.

The capacity of the hot air machine is different for the wind, and its capacitance will be different. Many hot air opportunities are used to install insulation bearings to work, so that the shaft current can be avoided effectively. The friends who have used industrial hot air machines know that if the axial current is added up, it will be easier to damage the bearing. It can not be used, so it is good to set the bearings into insulators.

Some hot air machine electric equipment can be variable frequency, like the frequency conversion air conditioning used in home, power is constant, speed has a great influence on it, more than a certain speed, it is necessary to take measures to endure high temperature, special grease can be complementary to the high temperature bearing, to ensure the safety of the motor.

Through the introduction of the structural features of the above hot air blower, we can roughly understand some of the performance characteristics of the hot air blower from the structure, and the unique advantages of the motor devices in all kinds of hot air machines, which are mainly related to the production environment of the factory, and the selection of these motors is also related to the cost of the cost, so I We should choose as much as possible according to the specific needs.

Professional CNC Turning parts

Professional CNC lathe processing

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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.

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From the overall installation structure of CNC CNC system, there are two kinds of integral structure and split structure.

The so-called monolithic structure is the CRT and MDI panel, operation panel and function module board composed of circuit boards installed in the same box. The advantage of this method is that it is compact and easy to install, but sometimes it may cause some signal connections to be too long. The split structure usually makes the CRT and the MDI panel, the operation panel and so on as a component, and the circuit board composed of the functional modules is installed in a chassis, which is connected by a wire or fiber. Many CNC machine tools take the operating panel as a single part, which is due to the different requirements of the machine tool, the operation panel should be changed accordingly, and the composition and body style is beneficial to the replacement and installation.

The installation of CNC operation panel on machine tools includes hanging type, bedside type, control cabinet type, control desk type and so on.

From the structural characteristics of the CNC circuit board, there are two common structures, that is, large panel structure and modular structure. The characteristic of big board structure is that a system usually has a big board, it is called the motherboard. The main board is equipped with a master CPU and a position control circuit for each shaft. Other related sub boards, such as ROM board, part program memory board and PLC board, are inserted directly on the main board to form the core part of the CNC system. It can be seen that the large plate has compact structure, small size, high reliability, low price, high performance / price ratio, and easy to integrate design of machine tools. Although the large plate structure has the above advantages, its hardware function is not easy to change and is not conducive to the organization of production.

Another high flexible structure is the open system structure of bus modularization. Its characteristic is to make CPU, memory, input and output control into plug-in board (called hardware module), and even CPU, memory, input and output control to form an independent microcomputer level hardware module, and the corresponding software is also a module knot. Structure, solidified in the hardware module. Hardware and software modules form a specific functional unit, which is called function module. Functional modules have well-defined interfaces, interfaces are fixed, become factory standards or industrial standards, and they can exchange information with each other. Therefore, the CNC system can be made up of building blocks, which makes the design simple, with good adaptability and expansibility, short trial production period, convenient adjustment and maintenance, and high efficiency.

According to the CPU and structure used in CNC system, the hardware structure of CNC system is generally divided into two categories: single CPU and multi CPU structure. The initial CNC system and some current economic CNC systems use a single CPU structure, and the multi CPU structure can meet the requirements of high speed, high machining precision and many complex functions of CNC machine tools. It also adapts to the need of integration into FMS and CIMS operation, thus getting the rapid development. It reflects the new water of the CNC system today. Flat.

Joint bearing connecting rod

The joint bearing can bear a large load. According to its different type and structure, it can bear the combined load of radial load, axial load or radial and axial coexistence. Since the composite material is embedded on the outer spherical surface of the inner ring, the bearing can produce self lubrication in operation. It is generally used for low speed swinging motion and low speed rotation. It can also be tilted in a certain angle range. When the abutment axis and the axle housing hole are not concentric, they can still work normally. Self lubricating joint bearings are used in water conservancy, professional machinery and other industries.

Joint bearings are widely used in engineering hydraulic cylinders, forging machine tools, construction machinery, automation equipment, automotive shock absorber, water conservancy machinery and other industries. Spherical plain bearings are spherical bearings. The basic type consists of inner and outer rings with spherical sliding spherical contact surfaces. According to its structure and type, it can bear radial load, axial load, or radial load.
Because the spherical sliding contact area of the joint bearing is large and the inclined angle is large, but also because most joint bearings have taken special processing methods, such as surface phosphating, galvanizing, chromium plating or outer sliding surface lining, padding, spraying and so on, so it has great load capacity and impact resistance, and has corrosion resistance and wear resistance. Loss, self aligning, lubrication, or self lubrication, no dirt contamination, even if misplaced. Therefore, the joint bearings are widely used in low speed swing motion, tilt motion and rotation motion.

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Quality: ISO 9001: 2008
Control strictly and follow specification
Move fast to meet your urgent need caused by accident.
Packing: Wooden case, hardboard, steel pallet, according to custom’s requirements
If you want to know more about cnc machining parts in China, Please contact us.

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