Casting process can be divided into three basic parts, namely the casting metal preparation, mold preparation and casting processing. Casting metal refers to the casting production of cast metal material, it is a metallic element as a main component, and join the other metal or metalloid elements and the composition of the alloy, traditionally known as cast alloy, cast iron, cast steel and main nonferrous cast alloys.
Metal melting is not merely a melting, also including smelting process, so that the metal poured into the mold, temperature, chemical composition and purity are consistent with the expected requirements. Therefore, in the smelting process to be performed in order to control the quality for the purpose of testing, liquid metal at specified metrics before allowing the casting. Sometimes, in order to meet the higher requirements, the molten metal in the furnace and the furnace processing, such as desulfurization, vacuum degassing, refining, pregnant or modification. Smelting metal commonly used equipment cupola furnace, electric arc furnace, induction furnace, resistance furnace, such as furnace.
Different casting methods have different mold preparation content. The most widely used sand casting for example, mold preparation includes modeling material preparation and moulding core making two items of work. Sand casting is used to modeling the core making all kinds of raw materials, such as foundry sand, sand binder and other materials, as well as the mixture of sand, sand, paint and other known collectively as the molding material molding material preparation task is in accordance with the casting requirements, metal properties, select the appropriate raw sand, a binder and accessories, then according to the certain proportion mix them into a certain properties of the sand and core sand. Commonly used sand mixing device has a sand roller mill, counterflow type sand mixing machine and the blade groove type sand mixing machine. The latter is designed for mixed chemical self-hardening sand design, continuous mixing, fast speed.
Modelling core is based on the casting process requirement, in determining a good modeling method, ready to molding materials based on. Accuracy of casting and the whole production process of economic effects, depending on the procedure. In many modern casting workshop, molding core are realized mechanization or automation. Commonly used sand molding core equipment is high, low pressure molding machine, polishing, sanding machine, flaskless shoot squeeze molding machine, core shooting machine, cold core machine and hot core box machine.
Casting casting casting from cooling after removal, a gate and riser, metal burr scull, sand casting casting also adhered sand, therefore must be cleaned process. The working device has shot blasting machine, gate cutting machine. Sand casting shakeout is labor conditions of poor working procedure, so the choice modeling method, should be taken into consideration for the shakeout to create convenient conditions. Some castings due to special requirements, but also the process of castings, heat treatment, such as plastic, anti-rust treatment, rough.
