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The first is the design process of castings. When designing, in addition to determining the geometric shape and size of the casting based on working conditions and metal material properties, the rationality of the design must also be considered from the perspective of casting alloy and casting process characteristics, that is, obvious size effects and problems such as solidification, shrinkage, stress, etc., in order to avoid or reduce the occurrence of defects such as component segregation, deformation, and cracking in the casting.
The second requirement is to have a reasonable casting process. Based on the structure, weight, and size of the casting, the characteristics of the casting alloy, and production conditions, appropriate parting surfaces, shapes, and core making methods are selected, and casting bars, cold iron, risers, and gating systems are reasonably set. To ensure the acquisition of high-quality castings.
The third is the quality of the raw materials used for casting. The quality of metal furnace materials, refractory materials, fuels, fluxes, modifiers, as well as casting sand, sand binders, coatings, and other materials that do not meet standards can cause defects such as porosity, pinholes, slag inclusions, and sand sticking in castings, affecting the appearance and internal quality of castings. In severe cases, castings can be scrapped. The fourth is process operation, which requires the development of reasonable process operation procedures, the improvement of workers'' technical level, and the correct implementation of process procedures.
In casting production, it is necessary to control and inspect the quality of castings. Firstly, it is necessary to establish process guidelines and technical conditions for the control and inspection of raw materials, auxiliary materials, and each specific product. Strictly control and inspect each process according to the process rules and technical conditions.
Finally, conduct quality inspection on the finished castings. Reasonable testing methods and appropriate testing personnel should be equipped. Generally, the appearance quality of castings can be judged by comparing sample blocks to determine the surface roughness of castings; Minor cracks on the surface can be inspected by coloring and magnetic particle methods. The internal quality of castings can be inspected and judged using methods such as audio, ultrasound, eddy current, X-ray, and gamma ray.
The second requirement is to have a reasonable casting process. Based on the structure, weight, and size of the casting, the characteristics of the casting alloy, and production conditions, appropriate parting surfaces, shapes, and core making methods are selected, and casting bars, cold iron, risers, and gating systems are reasonably set. To ensure the acquisition of high-quality castings.
The third is the quality of the raw materials used for casting. The quality of metal furnace materials, refractory materials, fuels, fluxes, modifiers, as well as casting sand, sand binders, coatings, and other materials that do not meet standards can cause defects such as porosity, pinholes, slag inclusions, and sand sticking in castings, affecting the appearance and internal quality of castings. In severe cases, castings can be scrapped. The fourth is process operation, which requires the development of reasonable process operation procedures, the improvement of workers'' technical level, and the correct implementation of process procedures.
In casting production, it is necessary to control and inspect the quality of castings. Firstly, it is necessary to establish process guidelines and technical conditions for the control and inspection of raw materials, auxiliary materials, and each specific product. Strictly control and inspect each process according to the process rules and technical conditions.
Finally, conduct quality inspection on the finished castings. Reasonable testing methods and appropriate testing personnel should be equipped. Generally, the appearance quality of castings can be judged by comparing sample blocks to determine the surface roughness of castings; Minor cracks on the surface can be inspected by coloring and magnetic particle methods. The internal quality of castings can be inspected and judged using methods such as audio, ultrasound, eddy current, X-ray, and gamma ray.
