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  • What Are The Factors That Affect The Quality Of Castings?
    Jun 29, 2018

    What are the factors that affect the quality of castings?

     

    Casting quality mainly includes appearance quality, intrinsic quality and use quality. Appearance quality refers to the casting surface roughness, surface defects, size deviations, shape deviations, weight deviations; internal quality mainly refers to the chemical composition, physical properties, mechanical properties, metallurgy of the castings, and holes, cracks, and inclusions present in the castings. Segregation and other conditions; the use of quality refers to the working durability of the casting under different conditions, including wear resistance, corrosion resistance, resistance to chilling heat, fatigue, shock absorption and other properties as well as machinability, weldability and other process performance.

     

    Casting quality has a great influence on the performance of mechanical products. For example, the wear resistance and dimensional stability of machine tool castings directly affect the accuracy of the machine tool to maintain life; various types of pump impeller, housing and hydraulic components of the size of the cavity, the accuracy of the profile and surface roughness, directly affect the pump And the hydraulic system's working efficiency, energy consumption and the development of cavitation; engine block, cylinder head, cylinder liner, piston ring, exhaust pipe and other castings strength and resistance to chilling heat, a direct impact on the engine's working life.

     

    Vacuum Cast Parts.jpgThere are many factors affecting the quality of castings. The first is the design process of castings. When designing, in addition to determining the geometry and size of the casting according to the working conditions and properties of the metal material, the rationality of the design must be considered from the perspective of the casting alloy and the characteristics of the casting process, ie, obvious size effect and solidification and shrinkage. , stress and other issues to avoid or reduce the composition of the casting segregation, deformation, cracking and other defects. The second is to have a reasonable casting process. That is, according to the structure, weight and size of castings, casting alloy characteristics and production conditions, choose the appropriate parting surface and shape, core method, set reasonable casting ribs, cold iron, riser and pouring system. To ensure the quality of castings. The third is the quality of the raw materials used for casting. The quality of materials such as metal charge, refractories, fuels, fluxes, modifiers, and foundry sands, sand binders, and coatings is sub-standard, which can cause defects such as porosity, pinholes, slag inclusions, and sticky sand, affecting the appearance quality of castings. And the internal quality, when serious, will make the casting scrap. The fourth is the process operation. It is necessary to formulate a reasonable process operation procedure and improve the technical level of the workers so that the process procedures can be implemented correctly.