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
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,
Working part cutting edge size calculation 1.1.1 Calculation of cutting edge size of blanking concave punch die The shape of the part is a relatively simple square, suitable for separate machining. The feature of the separate processing is that it is necessary to compare the conditions of [δd + δp] ≤ Zmax-Zmin.
After the cutting edges of the blanking die wear, only the size of the blades changes and all of them increase. The cutting edge size is generally calculated according to Equation 5-7. AA = (Amax-x △) 0 + δd (Equation 5-7)
After the cutting edge of the blanking die wears, the edge size changes only once and everything becomes smaller. The cutting edge size is usually calculated according to Equation 5-8. BA = (Bmin + x △) δp0 (Equation 5-8)
Amax-Maximum distance at the end of the mold perpendicular to the feed direction. Bmin-Minimum distance between punch edges perpendicular to the feed direction. x –Concavo-convex mold wear factor. △ –Blade manufacturing tolerance. 1) Calculate the convex and concave cutting edge sizes The base size is 30-0.1 + 0.1 and R5 is converted to R50-0.22 at IT13 level. Checklist 5-4 x1 = 1; X2 = 0.5 Δp1 = -0.017; δd1 = 0.025; δp2 = -0.012; δd2 = 0.017;
2) Calculation of the cutting edge size of the punching punch The accuracy of the parts is not high, it is IT13 grade, the base size of the hole is Φ400-0.039, and it is necessary to take a larger gap because the service life of the mold needs to be considered when determining the edge clearance. I have. The results are as follows. Zmax = 0.360mm Zmin = 0.246mm δp ＝ -0.014 ； δd ＝ 0.02; So Z = Zmin = 0.246mm
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