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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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Introduction to the identification of second-hand retreaded tires

cncmachining January 20, 2022

 

In addition to the important parts of second-hand cars, pay attention to the tires of second-hand cars. A friend of the reporter bought a second-hand car. At that time, the owner of the second-hand car dealer said that the tires were brand new, so the friend stopped paying attention to the tires. As a result, I drove for a few days after I bought it back but found that the tire was retreaded. In this regard, some automotive professionals said that when buying a second-hand car, we must look at whether there is a problem with the tire.

The first thing to look at is whether the tire has internal injuries, such as hardening and aging. To check whether the tire has been replaced by someone. It also depends on whether the tires have been refilled and shoddy. No matter how you look at this type of tires, it seems that there is no quality problem.

In addition, it depends on whether the tire has been retreaded. Compared with branded tires, the biggest difference between retreaded tires and branded tires lies in the wear resistance, and the most intuitive judgment method is:

Look, the tire tread shows blue light and the color is more natural;

Press, press the tread with your fingers, if there are no fingerprints left, it meets the quality requirements;

Pull, the rubber nail on the tread is not easy to break, and it can be restored to its original state immediately after releasing it;

scratching, scratching the tread with your nails, if no fingerprints are left, it meets the quality requirements.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

Link to this article：Introduction to the identification of second-hand retreaded tires

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