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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

Analysis of the advantages and disadvantages of PA6 nylon plastic raw materials

The main advantages of PA6 nylon plastic materials:
1. High mechanical strength, good toughness, high tensile and compressive strength. The specific tensile strength is higher than that of metal, and the specific compressive strength is comparable to that of metal, but its rigidity is not as good as that of metal. The tensile strength is close to the yield strength, more than twice as high as ABS. The ability to absorb shock, stress and vibration is strong, and the impact strength is much higher than that of general plastics, and is better than acetal resin.
2. Outstanding fatigue resistance, the parts can maintain the original mechanical strength after repeated inflections. Common escalator handrails, new bicycle plastic rims and other occasions where periodic fatigue is extremely obvious, PA is often used.
3. High softening point and heat resistance (such as nylon 46, etc., high crystalline nylon has a high heat distortion temperature and can be used for a long time at 150 degrees. After PA66 is reinforced with glass fiber, its heat distortion temperature can reach 250 degrees or more).
4. The surface is smooth, the friction coefficient is small, and it is wear-resistant. It is self-lubricating when it is used as a movable mechanical component and has low noise. It can be used without lubricant when the friction is not too high; if lubricant is really needed to reduce friction or help heat dissipation, water, oil, grease, etc. can be selected. As a result, it has a long service life as a transmission component.
5. Corrosion resistant, very resistant to alkalis and most salt solutions, also resistant to weak acids, engine oils, gasoline, aromatic compounds and general solvents, inert to aromatic compounds, but not resistant to strong acids and oxidants. It can resist the erosion of gasoline, oil, fat, alcohol, weak base, etc. and has good anti-aging ability. It can be used as packaging material for lubricating oil and fuel.
6. It is self-extinguishing, non-toxic, odorless, good weather resistance, inert to biological erosion, and has good antibacterial and antifungal capabilities.
7. It has excellent electrical properties. Good electrical insulation. Nylon has a high volume resistance and high breakdown voltage. It can be used as a power frequency insulating material in a dry environment, and it has good electrical insulation even in a high humidity environment.
8. The parts are light in weight, easy to dye and easy to shape. Because of its low melt viscosity, it can flow quickly. It is easy to fill the mold, the solidification point is high after the mold is filled, and the shape can be set quickly, so the plastic machining has a short molding cycle and high production efficiency.

The main disadvantages of PA6 nylon plastic raw materials:
1. Easy to absorb water. The water absorption is large, and the saturated water can reach more than 3%. To a certain extent, it affects the dimensional stability and electrical performance, especially the thickening of thin-walled parts has a greater impact; water absorption will also greatly reduce the mechanical strength of the plastic. When selecting materials, consideration should be given to the influence of the use environment and the accuracy of coordination with other components. Fiber reinforcement can reduce the water absorption rate of the resin, so that it can work under high temperature and high humidity. Nylon has a very good affinity with glass fiber. It is commonly used to make machining uhmw combs, toothbrushes, clothes hooks, fan bones, net bag rope, fruit outer packaging bags and so on. Non-toxic, but not long-term contact with acid and alkali. It is worth noting that after adding glass fiber, the tensile strength of nylon can be increased by about 2 times, and the temperature resistance can be improved accordingly.
2. Poor light resistance. In a long-term high temperature environment, it will oxidize with oxygen in the air, and the color will turn brown at the beginning, and then the surface will be broken and cracked.
3. The injection molding technology requirements are strict: the presence of trace moisture will cause great damage to the molding quality; the dimensional stability of the product is difficult to control due to thermal expansion; the existence of sharp corners in the product will cause stress concentration and reduce the strength of CNC mechanical parts; If the wall thickness is not uniform, it will cause distortion and deformation of the parts; the precision requirements of the CNC machining factory equipment are very high during the post-processing of the parts.
4. It will swell by absorbing water and alcohol. It is not resistant to strong acids and oxidants, and cannot be used as acid-resistant materials.

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