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,
Tapping stainless steel is much more difficult than tapping regular steel. Often, due to the large torque, the screw tap is “bitten” into the screw hole, collapses or breaks, and the thread surface is not light. The groove has a groove, the size is out of tolerance, and the chaos and taps are badly worn. Therefore, corresponding technical measures must be taken to solve the problem of machining stainless steel threads.
1. When tapping a stainless steel thread.
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The phenomenon of “tooth enlargement” is more serious, and the tap is “easy to bite” into the hole, so the hole at the bottom of the thread must be properly enlarged. In general, the diameter of the bottom hole of a screw with a pitch less than 1 mm is equal to the nominal diameter minus the pitch. If the pitch is greater than 1 mm, the diameter of the hole at the bottom of the thread is equal to the nominal diameter minus 1.1 times the pitch.
2. Choosing the right tap and the right amount of cut is the key to tap quality.
The tap material should be selected from cobalt or aluminum carbide high speed steel. The main deviation angle is related to the pitch and the number of tap handles. Head cone Kr = 5-7, 2nd and 3rd cone Kr = 10-20. Calibration parts are typically 3-4 thread lengths and are 0.05-0.1 mm / 100 mm inverted cones. Generally, the direction of the tip holder is b = 8 to 15, which allows you to control the direction of the tip flow. For straight groove taps, the front edge of the tap can be ground into a spiral shape.The rake angle of the tap is generally gp = 15 ° to 20 ° and the back angle is 8 ° to 12 °.
3. You can tap stainless steel using tapless tap.
See Figure 7. The diameter of the bottom hole before extruding with a slotless tap is as follows. d0 = dw-(0.5-0.6) P Here, dw——work screw outer diameter, mm. P-pitch.
4. When tapping stainless steel, make sure you have enough cooling lubricant.
Sulfate oil is usually selected from + 15% to 20% CCl4. White lead oil + engine oil or other mineral oil; kerosene is diluted with chlorinated paraffins.
5. If the tap is damaged during tapping, the workpiece can be soaked in nitric acid solution to corrode, and the high speed steel wire cone can corrode quickly without discarding the workpiece.
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