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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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Three commonly used compensation methods for CNC machining and mold machining

cncmachining December 17, 2020

1. CNC machining tool length compensation

The concept of tool length is an important concept. When programming a part, the programming center of the part must be specified first, and then the workpiece programming coordinate system can be established. It is just a workpiece coordinate system, and the zero point is generally on the workpiece. The length compensation of CNC machining is only related to the Z coordinate. It is not like the programmed zero point on the X and Y planes, because the tool is positioned by the spindle taper hole without changing, and the zero point of the Z coordinate is different. The length of each knife is different, for example, we have to drill a hole with a depth of 50 mm, and then click the tap with a depth of 45 mm, which has 250 mm and 350 mm taps respectively. At this time mm, the machine tool has set the workpiece zero point. When the mold processing is changed to tap tapping, if both tools are processed from the set zero point, the tap is too long, because it is longer than the drill, which will damage the tool and the workpiece.

2. Tool radius compensation

  • The concept of tool radius and compensation is just like using different tool path lengths as compensation. Basically, you don’t need to consider choosing the length of the tool yourself when programming. Because of the tool radius compensation, we can do it at the same time when programming. Did not consider too much tool diameter size. CNC machining tool length compensation is applicable to all tools, while tool radius compensation is generally only used for milling cutters.
  • Offset compensation: When the machining center is processing small workpieces, the fixture can accommodate multiple workpieces at a time. The programmer does not need to consider the zero point of each workpiece coordinate when programming, but program according to the respective programmed zero point, and then Use the fixture offset of CNC machining to move the programmed zero point on each workpiece of the machine tool. Just as tool length compensation and radius compensation allow programmers to cover tool length and size, fixture offset allows programmers to use fixture offsets regardless of the location of the workpiece fixture.

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