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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

How Do Cnc Swiss Machines Work

How Do Cnc Swiss Machines Work Save 0 What Is Swiss Machine –The full name of the walking CNC lathe, it can also be called the spindle box mobile CNC automatic lathe, the economical turning and milling compound machine tool or the slitting lathe. It belongs to precision machining equipment, which can complete compound  machining such as turning, milling, drilling, boring, tapping, and engraving at one time. It is mainly used for batch  machining of precision hardware and special-shaped shafts. This machine tool first originated in Germany and Switzerland. In the early stage, it was mainly used for precision machining of military equipment. With the continuous development and expansion of industrialization, due to the urgent needs of the market, it was gradually applied to the  machining of civilian products; the development of similar machine tools in Japan and South Korea Earlier than China, it was mainly used in the military industry in the early days. After the war, it was gradually

Spring Design Attention And Roll Forming Method

Spring Design Attention And Roll Forming Method The coiling characteristics and methods of springs are divided into cold coiling method and hot coiling method. Cold winding method: When the diameter of the spring wire is less than 8mm, the cold winding method is adopted. High-quality carbon spring steel wire is usually first cold drawn and then heat treated. After winding, it is generally not quenched, but only tempered at low temperature to eliminate the internal stress during winding. Hot-rolling method: Springs with larger diameter (>8mm) spring wire should use hot-rolling method. Hot rolled springs must be quenched and tempered at medium temperature. The Design Process Of Various Springs ·          Installation space: When designing a  compression spring , it is necessary to have a clear understanding of the space required for the installation of the spring, in order to effectively grasp the basic manufacturing conditions of the compression spring, including the outer diam

Analysis on the failure of vehicle intelligent transmission caused by dust

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, 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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