Seven Tips For Commodity Mould Reduction To Reduce Defects
In order to improve the performance of the Commodity mould, many manufacturers will properly process the Commodity mould.
The Commodity mould processing refers to the processing of the forming and blanking tools, in addition to the shearing and die-cutting Commodity moulds, but in many cases, the Commodity mould is finished.
It will also reflect the defects of processing, resulting in a decline in Commodity mould performance, so how to build Commodity mould processing defects?
1. Reasonably select and trim the grinding wheel. The grinding wheel with white corundum is better. Its performance is hard and brittle, and it is easy to produce new cutting edge. Therefore, the cutting force is small, the grinding heat is small, and the medium grain size is used in the particle size. 46 to 60 mesh is better. The hardness of the grinding wheel is medium soft and soft (ZR1, ZR2 and R1, R2), that is, the grinding wheel with coarse grain size and low hardness. The self-excitation is good to reduce the cutting heat.
2. It is very important to choose the appropriate grinding wheel for fine grinding. For the high vanadium and high molybdenum condition of the Commodity mould steel, it is more suitable to use GD single crystal corundum grinding wheel. When processing hard alloy and quenching hard material, the organic binder diamond is preferred. The grinding wheel and the organic binder grinding wheel have good self-grinding ability, and the roughness of the ground workpiece can reach Ra0.2μm. In recent years, with the application of new materials, the CBN (cubic boron nitride) grinding wheel shows a very good processing effect. Finished in CNC forming grinding machines, coordinate grinding machines, CNC internal and external cylindrical grinding machines, the effect is better than other types of grinding wheels.
3. In the grinding process, it is necessary to pay attention to dressing the grinding wheel in time to keep the sharpness of the grinding wheel. When the grinding wheel is passivated, it will slide and squeeze on the surface of the workpiece, causing burns on the surface of the workpiece and reducing the strength.
4. the rational use of cooling lubricants, play the three major functions of cooling, washing, lubrication, keep cooling and lubrication clean, thus controlling the grinding heat within the allowable range to prevent thermal deformation of the workpiece. Improve the cooling conditions during grinding, such as the use of oil-impregnated grinding wheels or internal cooling wheels. The cutting fluid is introduced into the center of the grinding wheel, and the cutting fluid can directly enter the grinding zone to exert an effective cooling effect to prevent the surface of the workpiece from being burned.
5. The gate should be opened symmetrically, and should be opened in the thick wall part of the product as much as possible, and the volume of the cold slug well should be increased.
6. For thin parts, the temperature should be increased to ensure that the material is smooth, and for thick-walled parts, the mold temperature should be lowered.
7.The gating system must be unobstructed, and the resistance must not be too large. For example, the size of the main runner, runner, and gate must be appropriate, the smoothness must be sufficient, and the transition zone must be arc-transitioned.
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