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
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 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
What are the factors that affect the surface roughness in machining precision parts?
1, the influence of cutting force and friction.When precision parts processing cutting tool cutting edge rounded corners and in the face of workpiece profile extrusion and friction may cause a plastic deformation of the metal material, which leads to the existing residual area distorted or deeper grooves, at this point, the increased surface roughness and machining brittle material cutting scrap into broken particles, and the surface of the processed often shows traces of particles collapses,Leaving many pits and roughening the surface.
2, the impact of the accumulation of clastic tumors.When a cutting tool is cutting plastic at a certain speed, some small particles on the chip will adhere to the tip of the front cutter face, forming the accumulation edge of high hardness, which can replace the front cutter face and cutting edge cutting.
When the friction between the chip and the stacking edge is greater than the cold welding strength between the stacking edge and the front cutter face, or when it is impacted or vibrated, the stacking edge will fall off, so that the new-up edge will be gradually generated in the future.The formation, growth and shedding of the stacking edges will seriously affect the surface roughness of the parts.
3. Influence of scaly spines.In the cutting process, due to the friction and cold welding of the chip on the cutting surface during precision parts processing, the chip will regularly stay on the front cutter surface, thereby squeezing the newly processed surface.In severe cases, the surface can tear.Scales form on the surface, making the surface rough and uneven.
Due to the effects of the above physical factors on the roughness, in order to reduce the surface roughness, in addition to reducing the plastic deformation caused by the cutting force, the accumulation of tumors and scales during the machining of precision parts should be avoided.
The main process measures are: choose the cutting speed which is not easy to produce the accumulation edge and the prick to improve the cutting performance of the material to choose the cutting fluid correctly.
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