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
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
1. Blue-collar layer: That is, CNC machining operation technicians, proficient in machining and CNC machining process knowledge, proficient in the operation and manual programming of CNC machine tools (attributes: automated machine tools), understand automatic programming and simple maintenance of CNC machine tools (attributes: automated machine tools), such There is a large market demand for personnel, and they are suitable for operating workers of CNC machine tools (attributes: automated machine tools) in the workshop, but due to their single knowledge, their wages will not be much higher. 2. Gray collar layer: One, CNC machining programmer: Master the knowledge of 5 Axis CNC machining Aluminum technology and the operation of CNC machine tools (attributes: automated machine tools), be familiar with the design and manufacturing expertise of complex molds (title: mother of industry), and be proficient in 3D CAD/CAM software, such as UG, GOOGLE PRO/E, etc. ; Familiar with CNC
The amount of cutting greatly affects the durability of tools, such as work hardening, cutting force, and cutting heat in the machining stainless steel. Whether the selected cutting amount is appropriate has a direct effect on the cutting effect.
1. Cutting speed Vc:
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When machining stainless steel, the cutting speed is slightly increased, the cutting temperature is much higher, the tool wear is increased, and the durability is significantly reduced. To ensure reasonable tool durability, it is necessary to reduce the cutting speed, which is generally selected between 40% and 60% of normal carbon steel. When drilling or cutting, the cutting speed will be slower due to the rigidity of the tool, heat dissipation condition, cooling effect, lubrication effect, and chip removal condition.
Different types of stainless steel have different machinability and the cutting speed needs to be adjusted accordingly. Generally, austenitic stainless steels such as 1Cr18Ni9Ti have a cutting speed correction coefficient Kv of 1.0, a hardness of 2cr13 or less, and an HRC28 or less. The Kv of martensitic stainless steel is 1.3 to 1.5, and the Kv of martensitic stainless steel such as 2Cr13 having a hardness of 28 to 35 is 0.9 to 1.1. The Kv of martensitic stainless steel such as 2Cr13 having a hardness of HRC35 or higher is 0.7 to 0.8. The Kv of concentrated nitric acid resistant stainless steel is 0.6 to 0.7.
2. Cutting depth ap:
There is a lot of room for roughing, and you must choose a larger cutting depth to reduce the number of tool movements and at the same time avoid contact between the tip and the surface of the blank to reduce tool wear. However, if the depth of cut is deep, care must be taken not to vibrate due to excessive cutting force. The option is ap = 2-5 mm. Smaller cutting depths can be selected for finishing and hardened layers should be avoided. Generally, p = 0.2 to 0.5 mm is used.
3. Feed amount f:
The increase in feed rate is not limited by the power of the machine tool. In addition, the feed amount cannot be increased because the remaining cutting height and chip accumulation amount increase as the feed amount increases. To improve the quality of the machined surface, lower feed rates should be used for finishing. At the same time, note that f must not be less than 0.1 mm / r to avoid cutting in work-hardened areas, avoid trace feeds, and pay attention to the cutting edge so that it does not stay on the cutting edge. Should be. Cutting surface The cutting amount of machined stainless steel is shown in Tables 4 and 5.
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