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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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The oil from the upper oil collecting pipe is divided into two strands due to the internal structure of the actual heat sink

cncmachining February 08, 2022

Analyze and simulate the flow and temperature on the surface of the heat sink. The fin radiator is composed of independent parallel oil flow channels, and each channel is composed of three connected small channels. The overall film length and film width diagram is a simplified model of the fin radiator. Export the simulated data to obtain a cloud map of its temperature distribution. On the horizontal line, the viscosity increases from the middle to the two sides, and some of the viscosity increases in the longitudinal direction, which proves that the speed of the oil in the oil passage decreases from the middle to the two sides. From the figure, the temperature distribution of the oil gradually decreases from the middle oil channel to the two sides. The isotherm is a downward convex curve, and in the longitudinal direction, the temperature gradually decreases.

Infrared wall temperature analysis. Taking the infrared camera on the upper surface of the heat sink, the following figure is obtained. As can be seen from the figure, the wall temperature gradually decreases from top to bottom. On the same horizontal line, there is a trend of high in the middle and low on both sides, but slightly in the middle of * It is lower than the oil passages on both sides. This is due to the internal structure of the actual heat sink. The oil from the upper oil collecting pipe is divided into two strands, and most of it flows into the oil passages on both sides of the middle. The length of each flow channel increases from the middle to the two sides, so the resistance also increases accordingly, so such a temperature cloud picture appears. It can be seen that the simulation and experimental results are basically consistent. It can be seen from the simulation and infrared cloud chart that most of the oil flows through the middle oil passage, and the flow rate is fast. Not only the flow on both sides is small, but the large resistance leads to the slow flow rate of the oil. Although the heat dissipation capacity on both sides is good, the overall heat dissipation is not effectively. The figure and the figure are the improved heat sink shape simulation temperature distribution cloud diagram. The improved fin shape improves the overall oil flow distribution and improves the heat dissipation efficiency. Therefore, appropriately increasing the flow on both sides or shortening the length of the oil flow channels on both sides can increase the heat dissipation effect.

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Link to this article：The oil from the upper oil collecting pipe is divided into two strands due to the internal structure of the actual heat sink

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