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Factors affecting the quality of casting by impeller of water pump


The first is the design and manufacturability of castings. The design, in addition to the casting geometry, to determine the size according to the working conditions and performance of metal material, must also be from casting alloy and casting process characteristics to consider the rationality of the design, namely the obvious size effect and solidification, shrinkage, stress and other issues, such as to avoid or reduce the segregation of cracking the deformation of the casting defects, and. Second, a reasonable casting process. According to the casting structure, weight and size, the casting alloy characteristics and production conditions, choose the appropriate parting surface and shape, core method, reasonable casting casting, cold iron, riser and pouring system, etc.. To ensure quality castings. Third is the quality of raw materials used in casting. The quality of automobile pump impeller, refractory materials, metal materials, fuel flux, modifier and foundry sand, sand binder, paint and other materials are substandard, will make the casting pinhole porosity, slag, sand and other defects, affecting the appearance quality and internal quality of casting, which will make the casting scrap. Fourth is the process operation, must formulate the reasonable craft operation procedure, raises worker's technical level, causes the technological process to carry out correctly.
In casting production, quality control and inspection of castings should be carried out. First of all, from the raw materials, auxiliary materials to each specific product control and inspection of the process code and technical conditions. Each process shall be controlled and tested in strict accordance with the process code and technical conditions. Finally, quality inspection of finished castings is carried out. Reasonable testing methods and appropriate testing personnel shall be provided. Generally, the surface quality of the casting can be judged by comparing the surface roughness of the casting. The fine cracks on the surface can be checked by coloring method and magnetic particle method. The internal quality of the casting can be checked and judged by audio, ultrasonic, eddy current, X ray and gamma ray.

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