Metal casting is the metal smelting into a certain requirements of the liquid and poured into the mold, the cooling and solidification, finishing treatment to get a predetermined shape, size and performance of the casting process. Casting is limited to the shape of the mold, and to achieve the purpose of free machining or a small amount of processing to reduce the cost and to a certain extent, Metal Casting reduce the time casting is the modern machinery manufacturing industry, one of the basic process.
Metal casting type modeling method is customary is divided into:
① ordinary sand casting, including wet sand type, dry sand and chemical hardening sand type 3.
② special casting, according to the shape material can be divided into natural mineral gravel as the main modeling materials of special casting (such as investment casting, mud casting, Metal Casting casting workshop shell casting, negative pressure casting, solid casting, ceramic casting Etc.) and special casting materials (such as metal casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.) with metal as the main casting material.
Metal casting processes typically include:
① the mold (the liquid metal into a solid castings of the container) to prepare, according to the use of materials can be divided into sand, metal type, ceramic type, mud type, graphite type, Metal Casting according to the number of times can be divided into one- And the permanent type, the merits of the preparation of the mold is the main factor affecting the quality of castings.
② casting metal melting and casting, casting metal (casting alloy) are cast iron, cast steel and casting nonferrous alloys.
③ Casting treatment and inspection, casting processing, including removal of core and casting surface foreign body, remove the riser, shovel burr and lichen and other protrusions and heat treatment, plastic surgery, Metal Casting rust treatment and rough processing.
Metal casting production, we must first according to the structural characteristics of castings, technical requirements, production volume, production conditions and other factors to determine the casting process program. The main contents include the casting position, parting surface, casting process parameters (machining allowance, from the mold slope, casting fillet, shrinkage, core, etc.) to determine, and then use the specified process symbols or text into a casting process Figure. Casting process diagram is to guide the production of technical documents, Metal Casting but also the main basis for acceptance of castings.