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Working principle of slow wire processing

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 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
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Hydrostatic guideway of CNC machining lathe

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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

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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,
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Analysis on the runout of automobile reducer

cncmachining February 01, 2022

If the imprint of the gear meshing area is out of the small end, the shim at the lower part (near the side of the gear) of the large bearing (7609E bearing) on ​​the driving street wheel should be appropriately added. If the footprint of the meshing area is close to or out of the big end, the shim should be appropriately reduced. Generally, the gear manufacturer has its own specific base for the adjusting shim. In addition, mark the increase or decrease according to the specific situation of each pair of gears. If it is marked with +2, the gasket should generally be reduced by 0.2 mm on the basis of the base; if it is marked with -20, the gasket should generally be increased by 0.2mm piece.

In the actual assembly process, if the gear and the large plane of the differential housing are qualified and the assembly process is clean, the runout should not exceed 0.70mm, because when the large plane of the differential housing is turned, the machine tool should be adjusted properly. , The large plane runout of the shell will not exceed 0.30mm, so the full standards of each manufacturer shall not exceed 0.05mm. Although there is no clear regulation on the runout of the passive gear tooth back, under normal circumstances, its runout will not exceed 0.02mm.

More than 90% of the abnormal noise of the new car reducer is caused by the large amount of runout after the assembly of the passive wheel, or the incorrect position of the meshing area of ​​the active and passive gears. The excessive runout of the tooth back is mainly caused by the excessive runout of the large plane of the differential housing. The material of the shell is gray cast iron, because the material is soft, it is easy to deform once bumped. The amount of swing far exceeds the amount of gear clearance, which will inevitably cause a violent impact during the operation of the active and passive gears, so that the lubricating oil cannot form an oil film on the gear surface, which reduces the life of the reducer gear that can be used under normal conditions of 150,000 km to only 1,000 km. about. 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.

Link to this article：Analysis on the runout of automobile reducer

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