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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 failure of vehicle intelligent transmission caused by dust

cncmachining January 21, 2022

Passed many trials. I found the rule of occurrence of the above-mentioned failure: only when the car is running continuously, the automatic transmission will lock the gear and enter the protection mode. At this time, if the engine is turned off for a few seconds and the car is driven again, the automatic transmission will resume normal operation. According to the analysis of the failure law, the temperature of the engine and the automatic transmission changes significantly with the driving time, which is likely to be a stable display of a certain control or working element of the automatic transmission. Check the intake manifold, there is no air leakage; check the throttle control mechanism, there is no problem; check the idle motor, it is normal. Then read the dynamic data stream of the engine and found that 4 items of data are abnormal. The 4 items of data are: the fuel injection pulse width at idling speed is 7.30ms (the normal value is 2.6ms), and the signal voltage of the intake manifold absolute pressure sensor is 3.3V (the normal value should be 1.sv), the number of steps of the idle motor is 102 (the normal value is 30), the ignition advance angle is l-20, and it is unstable. Comprehensive analysis of the above four data, the focus of the contradiction is concentrated on the intake manifold absolute pressure sensor, its signal voltage is too high, making the injection pulse width increase. At this time, the oxygen sensor detects that the mixture is too rich.

The engine electronic control unit then instructs the idling stepper motor to increase the air intake, which results in an increase in the number of idling steps, and the engine electronic control unit also constantly adjusts the mixture. The inspection shows that the intake manifold is not leaking. Further inspection found that the engine accelerates vigorously and has good power. It shows that there will be no problems with the wrong valve phase and the clogging of the exhaust pipe. Apply vacuum to the absolute pressure sensor of the intake manifold through a vacuum gun. The sensor indicates that the sensor is normal. According to the inspection results of the above steps, it is concluded that the fault location may be in the EGR system. After disassembly and inspection, it was found that the EGR solenoid valve was stuck in the open position, the exhaust back pressure pipe was broken, and the exhaust back pressure valve base was severely cracked. Troubleshooting after replacing the EGR solenoid valve. Based on past experience, the first thing that comes to mind is the automatic transmission control unit. It is suspected that some of the electronic components will function abnormally at high temperatures, so I replaced it with an automatic transmission control unit of the same model that was running normally and tested it. The failure still failed. exclude.

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