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 bett...
The Purpose Standardize the management of the scrapping of the company's metal stamping dies, prevent the loss of company assets, and formulate this system specially. Scope of application It is suitable for the management of the company's scrap molds. Definition If the molds listed in the assets of the company fall under one of the following circumstances, the use management department may apply for scrapping. 1. Molds that exceed the specified service life. 2. The mold is severely damaged by accidents or accidents, and molds that cannot be repaired or have no repair value. 3. Metal stamping dies that have not reached the service life, but due to safety, quality, efficiency and other issues, the repair still fails to meet the minimum requirements of the customer's product process or affects the production safety and efficiency. 4. Product customers have stopped placing orders or have not placed orders for molds in several years. 4. Responsibilities 1. Responsibilities of th...
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 stre...
The amount of cutting greatly affects the durability of tools, such as work hardening, cutting force, and cutting heat in the machining stainless steel. Whether the selected cutting amount is appropriate has a direct effect on the cutting effect.
1. Cutting speed Vc:
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When machining stainless steel, the cutting speed is slightly increased, the cutting temperature is much higher, the tool wear is increased, and the durability is significantly reduced. To ensure reasonable tool durability, it is necessary to reduce the cutting speed, which is generally selected between 40% and 60% of normal carbon steel. When drilling or cutting, the cutting speed will be slower due to the rigidity of the tool, heat dissipation condition, cooling effect, lubrication effect, and chip removal condition.
Different types of stainless steel have different machinability and the cutting speed needs to be adjusted accordingly. Generally, austenitic stainless steels such as 1Cr18Ni9Ti have a cutting speed correction coefficient Kv of 1.0, a hardness of 2cr13 or less, and an HRC28 or less. The Kv of martensitic stainless steel is 1.3 to 1.5, and the Kv of martensitic stainless steel such as 2Cr13 having a hardness of 28 to 35 is 0.9 to 1.1. The Kv of martensitic stainless steel such as 2Cr13 having a hardness of HRC35 or higher is 0.7 to 0.8. The Kv of concentrated nitric acid resistant stainless steel is 0.6 to 0.7.
2. Cutting depth ap:
There is a lot of room for roughing, and you must choose a larger cutting depth to reduce the number of tool movements and at the same time avoid contact between the tip and the surface of the blank to reduce tool wear. However, if the depth of cut is deep, care must be taken not to vibrate due to excessive cutting force. The option is ap = 2-5 mm. Smaller cutting depths can be selected for finishing and hardened layers should be avoided. Generally, p = 0.2 to 0.5 mm is used.
3. Feed amount f:
The increase in feed rate is not limited by the power of the machine tool. In addition, the feed amount cannot be increased because the remaining cutting height and chip accumulation amount increase as the feed amount increases. To improve the quality of the machined surface, lower feed rates should be used for finishing. At the same time, note that f must not be less than 0.1 mm / r to avoid cutting in work-hardened areas, avoid trace feeds, and pay attention to the cutting edge so that it does not stay on the cutting edge. Should be. Cutting surface The cutting amount of machined stainless steel is shown in Tables 4 and 5.
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