Metal processing clothes hook shrinkage problem

by:DIgao     2020-06-18
Metal clothes processing shrinkage problem is one of the most common problems in metal processing clothing, high metal clothing products to surface quality requirement, shrinkage is thorny problem. So as metal clothes hook the continuous improvement of the machining process, in order to minimize the metal clothes processing shrinkage problem, it is imperative to improve the quality of products. In the metal clothes hook processing plastic metal parts thicker clothes, such as reinforced rib or bumps in the formation of shrinkage is more serious than adjacent location, this is due to the thicker area of cooling speed is much slower than the surrounding area. Different cooling rate leads to the formation of a junction surface of sag, namely into the shrinkage mark. This defect seriously limits the metal clothing product design and molding, especially the large thick wall products such as TV chassis and cant display shell, etc. Strict for household electrical appliances, in fact, this kind of products must eliminate shrinkage mark, for toys such as the product with high surface quality requirement is not allowed to have the presence of metal processing clothes shrink marks. May be the cause of metal processing clothes shrink mark one or more, including processing method, the component geometry, material selection, mold design and so on. The geometry and material selection is usually decided by raw material suppliers, and it's not easy to change. But many other about mold manufacturers in mould design factors may affect the metal shrinkage clothes hook processing chain. Cooling flow design, the types of gate, gate size may produce a variety of effects. Small gate, for example, such as pipe gate cooling much faster than the cone-shaped gate. Gate in early cooling can reduce inside the cavity filling time and thereby increase the chances of shrinkage mark produced. For molding workers, adjust the processing conditions is to solve the problem of metal clothes hook processing contract one way. Significant impact on shrinkage filling pressure and time. Parts after filling, the excess material continue filling to compensate for material shrinkage cavity. Filling stage too short will lead to contraction intensifies, will eventually produce more or bigger shrinkage mark. This solution to metal clothes processing contract itself may not be to reduce shrinkage mark to the level of satisfaction, but workers can adjust the filling conditions to improve the shrink mark.
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