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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

Die casting mold stress

During the use of die-casting mold, the die-casting mold will have stress. So what is the reason for this situation? Let's take a look at the causes of stress in the lower die-casting mold.

1. Mold opening: In the process of core pulling and mold opening, when some components are deformed, mechanical stress will also be generated.

2. Mold temperature: the mold should be preheated to a certain temperature before production, otherwise, chilling will occur when the high temperature molten metal is filled, which will cause the temperature gradient of the inner and outer layers of the mold to increase, forming thermal stress, and cracking or even cracking on the mold surface . In the production process, the mold temperature continues to rise. When the mold temperature is overheated, it is easy to stick to the mold, and the moving parts fail to cause damage to the mold surface. A cooling temperature control system should be installed to keep the mold working temperature within a certain range.

3. Filling: The molten metal is filled with high pressure and high speed, which will inevitably produce fierce impact and erosion on the mold, thus generating mechanical stress and thermal stress. During the impact process, molten metal, impurities, and gas will also produce complex chemical interactions with the surface of the mold, and accelerate the generation of corrosion and cracks. When molten metal is encased in gas, it will expand first in the low-pressure area in the cavity. When the gas pressure increases, inward blasting occurs, pulling out the metal particles on the surface of the cavity and causing damage, and cracks due to cavitation.

4. Production process: In the production process of each die-casting part, due to the heat exchange between the mold and the molten metal, the surface of the mold produces periodic temperature changes, causing periodic thermal expansion and contraction, and generating periodic thermal stress. For example, the surface of the mold is subjected to compressive stress due to the temperature rise during pouring, and after the mold is opened to eject the casting, the surface of the mold is subjected to tensile stress due to the temperature drop. When this alternating stress is repeatedly cycled, the stress accumulated inside the mold becomes larger and larger. When the stress exceeds the fatigue limit of the material, cracks occur on the surface of the mold.

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