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What errors may occur during CNC machining and CNC machining​?

 CNC machining and numerical control machining are a method to control the movement of machine tools and the production process of machining through computer digitization and information digitization. It is an intelligent numerical control device developed as an economical, high-speed, reliable, multi-functional, intelligent, and open structure. CNC machining is also an important indicator that can measure the continuous level and comprehensive ability of a safety technology, as well as the degree of modernization of related science and technology capabilities, especially in aviation, biology, medical and other high-tech cultural industries, and it is also a powerful indicator. reflect. So, what errors may occur during CNC machining and CNC machining? Let us understand together:   The use of approximate machining motion or approximate tool contours causes errors in the CNC principle of machining. The reason why it is called machining principle error is because of the error in machining

What are the advantages of CNC machining of radiator parts?

For friends who have been in contact with the radiator component industry, they often see or hear "CNC machining", but too much exposure does not necessarily mean that many people understand. In fact, many questions are still about CNC machining. What are the advantages? Let's take a closer look. CNC machining is an index-controlled machine tool machining, which is a method of using digital information to control the machining process. Traditional mechanical processing is done manually by machine tools. During processing, the mechanical cutter is shaken to cut metal, and the accuracy is measured with calipers and other tools. However, traditional artificial intelligence processing is far from being able to meet the needs of production development. Therefore, the emergence of CNC machining provides the possibility for the standardization, precision and efficiency of mechanical product processing. The CNC machining process in the radiator component industry also shines. The

Eupec BSM100GT120DN2

# BSM100GT120DN2 Eupec BSM100GT120DN2 New 100A/1200V/IGBT/3U; IGBT Modules 1200V 100A TRIPACK , BSM100GT120DN2 pictures, BSM100GT120DN2 price, #BSM100GT120DN2 supplier ------------------------------------------------------------------- Email: [email protected] https://www.slw-ele.com/bsm100gt120dn2.html ------------------------------------------------------------------- BSM100GT120DN2 Manufacturer: Infineon Product Category: IGBT Modules RoHS: No Brand: Infineon Technologies Product: IGBT Silicon Modules Configuration: Hex Collector - Emitter Voltage VCEO Max: 1200 V Collector-Emitter Saturation Voltage: 2.5 V Continuous Collector Current at 25 C: 150 A Gate-Emitter Leakage Current: 400 nA Pd - Power Dissipation: 680 W Package / Case: EconoPACK 3A Maxim um Operating Temperature: + 150 C Maximum Gate Emitter Voltage: 20 V Minimum Operating Temperature: - 40 C Mounting Style: Screw Factory Pack Quantity: 10   100A/1200

Why are Bolts Tightened? What are the Benefits of Tightening Them?

Keywords:bolts,Why are bolts tightened? What are the benefits of tightening it?

Recently, there has been a lot of publicity about the spirit of craftsman, with reports on how rigorous the method of tightening bolts by German technicians is compared with the method of Tightening bolts by Chinese workers. Strictly speaking, in the process of equipment assemblly, the method of tightening bolts has been defined in the design, even with what tools?Screw bolt so simple thing, how to still decide an operation specification? Are designers really looking for trouble? In fact, the screw bolt is not as simple as imagined. The screw bolt is to make the bolt obtain an initial pretightening force. What role does this pretightening play?

 

Why to make the bolt to obtain an initial preload, this should start from the role of the bolt connection.

 

Transfer lateral force or torque

The bolt pretightening force generates pressure between the contact surfaces of the connected parts. The greater the pressure between the contact surfaces, the greater the transverse force can be transmitted. When the pressure on the contact surface is large enough, the transverse force is transferred entirely by the friction force, and the bolt only bears the pre-tightening force, not the shear stress and compressive stress, and the safety of the bolt is greatly increased, as shown in Figure 1.

 

Sealing function

When the bolt connection is used for pressure pipe or pressure vessel, the bolt should have enough pretightening force to play a sealing role, and the total pretightening force of the bolt should not be less than the pressure of the fluid between the contact surface, as shown in Figure 2. 

Prevent the structure from opening

Generally under fatigue load of bolt connection are not allowed to be fitting slotted, once produce gap between fittings, bolt tension will be increased with the increase of the tensile load increase quickly, the image below for the bolt tensile force and the load curve (as shown in figure 3), we can see that in the first half of the curve, by fitting between slit, bolt tensile slow growth, After the joint is slit, the bolt tension increases rapidly.

 

After the joint is opened, the amplitude of the alternating fatigue load of the bolt will increase rapidly, and the fatigue strength of the bolt will be greatly shortened.

Bolt tightening is analyzed from three aspects, including:

  • Bolt pretightening can prevent the opening separation of the connecting piece, improve the fatigue strength of the bolt connection;
  • To prevent the sliding of the connecting piece, relying on friction to achieve the role of the connecting piece to resist external load, to avoid the bolt subjected to shear load;
  • Prevent internal pressure leakage of pressure vessels.

 

The above three points are exactly the three parts of VDI2230 standard to calculate the bolt required preload, that is, the minimum preload required by the bolt, so as to design the appropriate bolt specification and performance grade, and finally determine the bolt preload.

 

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