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...
What are the factors that affect the surface roughness in machining precision parts?
1, the influence of cutting force and friction.When precision parts processing cutting tool cutting edge rounded corners and in the face of workpiece profile extrusion and friction may cause a plastic deformation of the metal material, which leads to the existing residual area distorted or deeper grooves, at this point, the increased surface roughness and machining brittle material cutting scrap into broken particles, and the surface of the processed often shows traces of particles collapses,Leaving many pits and roughening the surface.
2, the impact of the accumulation of clastic tumors.When a cutting tool is cutting plastic at a certain speed, some small particles on the chip will adhere to the tip of the front cutter face, forming the accumulation edge of high hardness, which can replace the front cutter face and cutting edge cutting.
When the friction between the chip and the stacking edge is greater than the cold welding strength between the stacking edge and the front cutter face, or when it is impacted or vibrated, the stacking edge will fall off, so that the new-up edge will be gradually generated in the future.The formation, growth and shedding of the stacking edges will seriously affect the surface roughness of the parts.
3. Influence of scaly spines.In the cutting process, due to the friction and cold welding of the chip on the cutting surface during precision parts processing, the chip will regularly stay on the front cutter surface, thereby squeezing the newly processed surface.In severe cases, the surface can tear.Scales form on the surface, making the surface rough and uneven.
Due to the effects of the above physical factors on the roughness, in order to reduce the surface roughness, in addition to reducing the plastic deformation caused by the cutting force, the accumulation of tumors and scales during the machining of precision parts should be avoided.
The main process measures are: choose the cutting speed which is not easy to produce the accumulation edge and the prick to improve the cutting performance of the material to choose the cutting fluid correctly.
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