Types of metal casting are customarily divided into:
① Ordinary sand casting, including 3 types of green sand, dry sand and chemically hardened sand.
② Special casting, according to the modeling material, can be divided into special casting with natural mineral sand and gravel as the main modeling material (such as investment casting, clay casting, casting workshop shell casting, negative pressure casting, solid casting, ceramic casting Etc.) and special casting with metal as the main mold material (such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.).
The metal casting process usually includes:
① Preparation of casting molds (containers that make liquid metal into solid castings). The casting molds can be divided into sand, metal, ceramic, clay, graphite, etc. according to the materials used, and can be divided into disposable and semi-permanent types according to the number of uses. And permanent mold, the pros and cons of mold preparation are the main factors affecting the quality of castings;
② Melting and pouring of cast metals, cast metals (cast alloys) mainly include cast iron, cast steel and cast non-ferrous alloys;
③ Casting processing and inspection. Casting processing includes removal of foreign bodies on the core and surface of castings, removal of pouring risers, shoveling of burrs and drape seams, as well as heat treatment, shaping, anti-rust treatment and rough machining.
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