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Working principle of slow wire processing

 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

Classification of CNC Machining Occupation Levels

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

Elimination of Gear Backlash in CNC Machining Feed System

Elimination of Gear Backlash in CNC Machining Feed System   The transmission gear in the feed system of the CNC machining machine tool must eliminate the transmission gap between the meshing gears as much as possible, otherwise the motion will lag behind the command signal after each reversal of the feed system, which will affect the machining accuracy (accuracy) ). There are the following two common methods for CNC machining machine tools to eliminate the transmission gear gap.   1. Rigidity adjustment method   The rigid adjustment method is an adjustment method that cannot be automatically compensated for the tooth side clearance after adjustment. Therefore, the pitch tolerance and tooth thickness of the gear must be strictly controlled, otherwise the flexibility of the transmission will be affected. This adjustment method has a relatively simple structure and a better transmission rigidity.   (1) Eccentric shaft adjustment method   As shown in Figure 610, the gear 1 is mounted on th

A small inventory of thread cutting methods

In actual processing, the types of threads generally include: ordinary single thread, trapezoidal thread, special thread, special-shaped thread, etc. Among them, ordinary threads are the most widely used. Coarse threads are mostly used for connection, while fine threads are used for the connection of thin-walled parts or parts subject to variable load, vibration and impact load, and can also be used for mechanism fine-tuning. When machining ordinary threads, it is necessary to pay attention to the need for multiple cycle feeds during cutting, and the cutting depth must be reduced in accordance with a certain proportion each time.plastic machining

 If the cutting depth of each tool is the same, the force on the cutting edges on both sides of the thread turning tool will increase sharply as the material removal rate increases, resulting in a decrease in thread accuracy and tool damage. In the competition, internal threads and external threads are relatively common, and the processing is generally less difficult. The main attention should be paid to the calculation of the bottom of the thread.


Compared with ordinary threads, trapezoidal threads have longer length, larger pitch, deeper cutting depth, greater cutting force, higher precision requirements, and greater processing difficulties. The thread cutting methods of CNC lathes generally include: straight approach, oblique approach, staggered cutting, and grooving rough CNC cutting.



(1) Straight forward method. Refers to when the lathe is cutting, the Z-direction does not change when the linear motion is performed, and the X-direction feeds a cutting depth in stages. It is characterized by convenience, quickness, and high efficiency. Generally, ordinary threads with a small pitch can be used. However, because the two edges of the turning tool are cutting at the same time, the chip removal is not smooth, and the force is large, the cnc turning tool is easy to wear, and the chips will scratch the thread surface.



(2) Inclined method. It refers to the Z-direction feed and the X-direction also has linkage, forming a diagonal feed mode. At this time, the thread turning tool always has only one cutting edge to participate in the cutting, the chip removal is smoother, and the force and heat are less than the straight forward method. But when the thread depth is deep and the pitch is large, the phenomenon of knife sticking is easy to occur.



(3) Staggered cutting method. The thread turning tools are staggered in the direction parallel to the left and right side of the thread, respectively, until the bottom of the thread. It is very suitable for large thread cutting, but the programming is more complicated.
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(4) Grooving rough cutting method. First, use a grooving tool smaller than the width of the thread turning tool head to rough cut a groove, and then use the thread turning tool for thread processing. Large-pitch threads are often used, but the operation and programming are extremely cumbersome.

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