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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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How Do Cnc Swiss Machines Work

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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
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Spring Design Attention And Roll Forming Method

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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
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When the pressure in the box is released to be less than the compression elastic force of the thin steel plate

cncmachining November 15, 2021

 

The ND2 locomotive is an early diesel locomotive imported from Romania in the early 1970s. In the design of its diesel engine crankcase explosion-proof device, it is required that when the temperature and pressure of the oil and gas in the box rise and reach the set value due to certain abnormal conditions, several explosion-proof membranes arranged around the crankcase will be broken, causing high temperature, High-pressure oil and gas are released into the machine room to relieve the pressure in the box. However, if the continuous release of oil and gas in a short period of time causes the oil and gas to be filled in the machine room, it is very easy to cause a big explosion in the entire machine room and cause heavy losses. Therefore, the design of the protective device of the crankcase has a large defect. In recent years, ND2 locomotives have experienced 7 explosion accidents caused by the continuous release of oil and gas in the crankcase of the diesel engine. The crankcase was deformed by the explosion, the roof of the locomotive was blown up, and four explosions occurred during the operation of the locomotive. These explosions not only caused heavy losses to the locomotive, but also directly endangered driving safety.

ND2 locomotive diesel engine crankcase protection device and its working principle ND2 locomotive diesel engine is equipped with 2 sets of crankcase protection device, college of diesel locomotive major, bachelor degree, now engaged in diesel engine technology work. That is, explosion-proof valve and exhaust device. Explosion-proof valve The crankcase of ND2 locomotive diesel engine is equipped with 9 sets of explosion-proof valves, which are distributed around the crankcase. There is a 0.5mm thick arc-shaped thin steel plate between the explosion-proof valve cover and the intermediate body. The upper end of the steel plate is fixed on the explosion-proof valve by means of 3 bolts on the cover, and the lower end is pressed under the rectangular hole of the intermediate body by its own arc-shaped elastic force. The inside of the rectangular hole of the intermediate body is covered with a 0.05mm thick polyvinyl chloride fiber film, which separates the oil and gas in the crankcase from the atmosphere between the machinery outside the box. When the oil and gas pressure in the crankcase of the diesel engine rises to the set value due to some abnormal situation, the high-pressure oil and gas will break through the sealing film and open the thin steel plate to quickly release the high-pressure oil and gas in the box to the machine room outside the box. When the pressure in the box is released to less than the pressing elastic force of the thin steel plate, the thin steel plate is then pressed back to its original position, sealing the rectangular hole of the intermediate body, preventing the oil and gas in the box from continuing to diffuse between the machines.

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