What are the factors that can affect the quality of castings?
There are many factors affecting the quality of castings, which are mainly analyzed from the following aspects:
First, the design process of large castings. In addition to determining the shape or size of castings according to the working conditions and the performance of metal materials, the rationality of design must be considered from the perspective of casting materials or casting process characteristics. It is obvious that there are a series of problems related to size effect and solidification as well as shrinkage and stress, In order to minimize the occurrence of component segregation, deformation, cracking and other defects of castings.
Second, reasonable casting process shall be selected during processing, that is, more appropriate parting surface, molding and core making methods shall be selected according to the structure, weight and size of castings, materials and production conditions selected for casting, and cold iron, riser and pouring can be reasonably set to ensure the production of high-quality steel castings.
Third, the quality of raw materials selected, such as furnace charge, refractory, fuel, solvent, casting sand and coating, does not conform to the standards, which will lead to the occurrence of defects such as air holes, pinholes and slag inclusions in the castings produced, which will directly affect the appearance and internal quality of the castings, and even lead to the scrapping of the castings when it is especially serious.
Fourth, processing technology operation. To process castings, it is necessary to select a reasonable processing operation process, strengthen the technical level of operators, and strictly regulate the process.