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
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
With the rapid development of science and technology, the use of metal stamping parts in various industries has become more and more extensive, and the quality and size requirements of the products have become more and more stringent. The ancient processing technology of a few products could not meet the requirements. Among them, the metal drawing parts are especially convex. During the drawing process of the drawing parts, due to the anisotropy of the material, the uneven thickness and the inaccurate positioning or the unevenness of the drawing die gap, the top of the drawn stamping part will be Untidy. For parts that require flat and beautiful ends, the trimming process needs to be supplemented. In the past, simple trimming techniques (flashing of simple molds or trimming on a lathe or spinning machine) did not meet the requirements of small officials, and work obedience was low. However, the desired effect can be achieved by using a rotary cutting die with higher processing accuracy.
Metal molds have not introduced the in-mold rotary cutting process in the past few years, and ordinary continuous drawing molds are directly blanked or processed by secondary rotary cutting. Direct blanking does not have high requirements on the mouth of the product, and the length dimension cannot reach the precision of the rotary cutting; the secondary rotary cutting process is labor-intensive and the power is not high. In recent years, the hardware mold processing equipment and planned technology have been developed very quickly, and many continuous drawing molds have selected the in-mold rotary cutting process.
Let’s analyze in detail how to change the in-mold rotary cutting:
1. Before the continuous drawing mold is directly blanked, it is necessary to leave an empty step before the blanking step, because the space required to meet the needs of the rotary cutting is changed. Ordinary small products and products with thin materials require an insert orientation of about 60*60. For large products, or products with thick stretch materials, the space required is a little larger. Ordinary continuous drawing dies are planned to leave an empty step before blanking.
2. Since the in-mold rotary cutting needs to take the slider and the distance needs to be met, the height of the template to be satisfied is more than 280 in the ordinary mold. If it is insufficient, the foot can be added.
3. The most important part of in-mold rotary cutting is to ensure the balance of the rotary laser cutting process. The tension spring force required by the bottom of the slider can be selected as a nitrogen tension spring.
4. In-mold rotary cutting is similar to single-process rotary cutting. Both use the die core and slider to slide back and forth to achieve the purpose of rotary cutting. However, the continuous drawing die has a small space and needs to be synchronized with all the molds. Therefore, the slider It needs to be small, high precision, and short distance. It is necessary to complete all the rotary cutting operations for 5-10 mm. In order to ensure that the mouth of the rotary cutting is even, we plan to accurately calculate the slider, and the gap should not be too large. Rolling needles are inserted around the die core, so that the sliding is stable, and the slider is not easy to wear.
5. There is another difficulty in in-mold rotary cutting, that is, the positioning center on the rotary cutting punch. For a single punch, the positioning center is placed in the product by hand, and then placed in the mold, and then the positioning center is taken out after punching. Internal rotary cutting cannot be manually relieved of the positioning center. The positioning center must be fixed on the rotary cutting punch, and at the same time, it needs to be moved back and forth, and it must be able to return accurately.
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