Casting process: the mold (the liquid metal becomes the […]
Casting process: the mold (the liquid metal becomes the container of the solid casting) is prepared. The mold can be divided into sand type, metal type, ceramic type, mud type, graphite type, etc. according to the materials used, and can be divided into disposable type according to the number of times of use. Semi-permanent and permanent, the pros and cons of casting preparation are the main factors affecting the quality of castings. The melting and casting of cast metal, cast metal (casting alloy) mainly cast iron, cast steel and cast non-ferrous alloy. Casting treatment and inspection, casting processing includes removal of foreign objects on the core and casting surface, removal of the riser, burrs and burrs, and heat treatment, shaping, anti-rust treatment and roughing. It mainly includes appearance quality, intrinsic quality and quality of use.
Appearance quality refers to the surface roughness, surface defects, dimensional deviation, shape deviation and weight deviation of the casting; the intrinsic quality mainly refers to the chemical composition, physical properties, mechanical properties, metallographic structure of the casting, and the holes, cracks, inclusions existing in the casting. Segregation and other conditions; the use of quality refers to the working durability of the casting under different conditions, including wear resistance, corrosion resistance, chilling heat, fatigue, shock absorption and other properties as well as machinability, weldability and other process performance.