铸造 类型(外国英文资料).docVIP

铸造 类型(国外英文资料) It is made of moulding and core sand to make castings, and liquid metal is cast in gravity to produce castings. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting. Because of sand mold casting molding materials used in the cheap, simple mould manufacturing, piece of casting production, the batch production and mass production are able to adapt to, for a long time, has been the basic technology of casting production. The castings of sand mold are usually composed of exterior sand type and type core. In order to improve the surface quality of castings, a coating is often painted on sand and core surface. Coating is the main component of high refractoriness, high temperature and chemical stability, good powdery material and adhesive, and also with to facilitate the application of carrier solvent (water or other) and all sorts of additive. The basic raw materials of sand mold are foundry sand and sand cement. The most commonly used casting sand is siliceous sand. The high temperature performance of silica sand can not meet the requirements of using zirconium, chrome-iron ore, corundum sand and other special sand. Made for the sand mould and core has a certain strength, when handling, type and pouring liquid metal, without deformation or damage to the general to add sand binder in foundry, will become a sand loose sand bonded together. Is the most widely used sand binder clay, also can be used in a variety of drying oil or semidrying oil, water soluble silicate and phosphate and a variety of synthetic resin as a sand binder. Used in sand casting sand mold by sand binder used in the outside of the green sand mold and build strength in different ways into clay, dry clay sand mould and chemical hardening sand mold. The clay wet sand type is the main binder of the sand with the clay and the right amount of water, and the sand type is made into the form and the pouring in the wet condition. Wet casting has a long history and is widel