Many different types of casting press molding method customarily divided into: ① ordinary sand casting, including wet sand, dry sand and chemical hardening sand three categories. ② special casting, press molding materials can be divided into natural mineral sand and gravel as the main form of special casting material (such as investment casting, cement casting, foundry shell casting, vacuum casting, solid casting, ceramic mold casting etc.) and a metal as the main material of special casting mold (such as a metal casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.) categories.
Casting: pressure casting for short, is a way to pressure the molten alloy was poured into indoor, high-speed steel mold cavity filling and make alloy liquid form under pressure castings solidification method. Die casting method different from other main characteristics of high-pressure and high-speed. Casting: Casting, is a special casting. Parts obtained by this method generally do not need to be machined. Such as investment casting, pressure casting.
Casting is compared with the traditional casting process in terms of a casting method. It can obtain a relatively accurate casting shapes and high precision. The more common approach is: First, according to product requirements design (can be left margin is very small or no left margin) of the mold with casting wax casting method, get the original wax mold; repeated in the wax mold paint and sanding process, hardened shell and dry; then melt away inside the wax mold is to dewaxing, access cavity; calcined shell to obtain sufficient strength; casting metal material required; clear sand after shelling to obtain accuracy of the finished product. Depending on the product needs or for heat and cold.
Wax casting: the lost wax casting method, first appeared in the Spring and Autumn Period, the entire manufacturing process are manual operations. Its process is: the wax into the type of device you want to create the style, after leaching temperature fine slurry to the surface of the wax pattern and sprinkle spinning in the mud surface, repeated many times, so as to form a complete shell, dried heating the wax melt out of the cavity is formed for casting copper solution (ie: copper plus lead, zinc, tin and other metal elements in solution). Completion of casting, after peeled, polished, do the old, an exquisite antique bronze on the show in front of you. Lost wax casting investment casting Precision now known as precision casting, is a little cutting or no cutting precision casting, precision casting industry is an excellent technology, its application is very extensive. It is not only applicable to all types and alloy precision casting, casting and production of dimensional accuracy, surface quality than other methods must be high precision casting, precision casting and even other methods difficult to cast complex, high temperature resistant, not easy to process castings, can be used precision casting investment casting precision casting, too.
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