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Working principle of slow wire processing

 Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much better t

Hydrostatic guideway of CNC machining lathe

The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces of the slide rail (TTW guide) to form a pressure oil film to float the moving parts , Make the sliding rail (TTW guide) surface in a pure liquid friction state.   CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining c17200   beryllium   copper   and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and lette

Introduction of KOVAR parts

KOVAR parts are commonly used as metal casing materials in the electronic packaging industry. Because they have a linear expansion coefficient close to that of molybdenum group glass, and can produce less sealing stress during the sealing (melting) process with molybdenum group glass, so To obtain good air-tightness, in order to make the metal tube and shell to achieve air-tight sealing, in the entire sealing process, the annealing process undoubtedly plays an important role as a link between the previous and the next. The internal stress generated during KOVAR  machining also prepares the material structure for the implementation of the subsequent process-the sealing process of the metal parts. The main purpose of annealing Kovar shell before sealing is to: (1) Eliminate machining stress. When Kovar undergoes plastic machining deformation during cold working, about 10% to 15% of the applied energy is converted into internal energy, which is commonly referred to as internal stress,

Analysis of Tube Blocking of Liquid Storage Dryer in Automobile Air Conditioner

 

The function of desiccant in automobile air-conditioning is to absorb water in the refrigeration system. When using desiccant in automobile air-conditioning refrigeration system, special attention should be paid to high strength and low wear. The desiccant should also have good compatibility with the refrigerant. High-quality molecular sieves have high strength, low abrasion and good water absorption. Therefore, molecular sieves are mainly used as desiccants in automotive air conditioners. The fake and inferior liquid storage dryers use inferior and cheap desiccants (such as anhydrous calcium chloride, silica gel, etc.) due to their poor strength, easy to cause breakage and pulverization, and poor water absorption, so they often use refrigeration systems Blocked.

The sight glass has two functions: one is to indicate whether there is enough refrigerant in the system; the other is to indicate whether there is water in the refrigerant. The sight glass should be made of materials resistant to corrosion by refrigerants and sealed. There are two assembly methods: sintered and screw-in. The sight glass of the counterfeit liquid storage dryer is made of materials that are not resistant to refrigerant corrosion, resulting in poor sealing and refrigerant leakage.

When there are too many impurities or desiccant in the liquid storage dryer and the suction pipe is blocked, the cooling effect will decrease, and there is a significant temperature difference between the inlet and outlet of the liquid storage dryer. At this time, the liquid storage dryer must be replaced. Due to the different performances of the two refrigerants, HFC-134a and CFC-12, different receiver dryers are required and cannot be mixed. The storage dryer suitable for HFC-134a should use XH-7 molecular sieve as the desiccant, and the O-ring of the connection port should be made of materials with good compatibility with HFC-134a. Since the car air conditioner is installed on the car, the car is bumpy and vibrated greatly during the driving process, so it cannot be connected with rigid metal, but can only be connected with a flexible rubber hose.

。For automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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