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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

Hydrostatic guideway of CNC machining lathe

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

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

Talking about the Application of Beryllium Copper in Plastic Mould

Nowadays, more and more beryllium copper mold materials have been used in the manufacture of plastic molds, and there is a rising trend. What is the reason for this phenomenon? Let me learn about the use of beryllium copper in plastic molds with the editor, and why.

 

1. Sufficient hardness and strength: After many tests, engineers can find out and master the hardening conditions and working conditions of beryllium copper machining alloy precipitation and the mass characteristics of beryllium copper (this is the point that the beryllium copper alloy is based on A prelude to the application of formal products in the market); beryllium copper materials need to go through multiple cycles of tests before they are used in plastic molds to finally determine the physical properties and chemical components that meet the manufacturing and processing; the proof of theory and practice-beryllium When the hardness of copper is hrc36-42, it can reach the hardness, strength, high thermal conductivity required for tungsten die manufacturing, simple and convenient machining, long mold life, and save development and production cycle.

 

2. Good thermal conductivity: The thermal conductivity of beryllium copper material is beneficial to control the temperature of the plastic machining mold, and it is also easier to control the molding cycle, while ensuring the uniformity of the mold wall temperature; if compared with the steel mold, the molding of beryllium copper The cycle is much smaller, and the average temperature of the mold can be reduced by about 20%. When the difference between the average ejection temperature and the average wall temperature of the mold is small (for example, when the mold parts are not easy to be cooled), use the beryllium copper mold material to cool The time can be reduced by 40%. The mold wall temperature is only reduced by 15%; the characteristics of the above beryllium copper mold materials will bring several benefits to the mold manufacturers using this material to shorten the molding cycle and increase the productivity; the uniformity of the mold wall temperature improves the quality of the drawn products; The mold structure is simplified because the cooling pipes are reduced; the temperature of the material can be increased, thereby reducing the wall thickness of the product and reducing the cost of the product.

 

3. Long service life of the mold: Budgeting the cost of the mold and the continuity of production, the expected service life of the mold is very important for the manufacturer. When the strength and hardness of the beryllium copper meet the requirements, the temperature of the beryllium copper Stress insensitivity can greatly improve the service life of the mold. Before determining the use of beryllium copper mold materials, the yield strength, elastic modulus, thermal conductivity and temperature expansion coefficient of beryllium copper should also be considered. The resistance of beryllium copper to thermal stress is much stronger than that of die steel. From this point of view, the service life of beryllium copper is remarkable!

 

4. High thermal penetration rate: In addition to the thermal conductivity of the pull, the thermal penetration rate of the powder metallurgy mold material is also very important to the plastic products. On the mold using beryllium bronze, the traces of overheating can be eliminated. If the thermal penetration rate is low, The contact temperature of the distal region of the mold wall will be higher, which will increase the temperature difference of the mold, and in extreme cases will cause the temperature of the region to change from the sink mark at one end of the plastic product to the trace of overheated product at the other end .

 

5. Excellent surface quality: beryllium copper is very suitable for surface finishing and can be directly electroplated, and the adhesion performance is very good, and the polishing treatment of beryllium copper is also very easy.

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