The application range and characteristics of the casting process

Casting process is a method of mass production of jewelry by casting machine. This method has the advantages of improving work efficiency and reducing cost. The most used is casting plate, casting ingot plate, casting chassis, casting scribing plate and so on.

Make rubber mold according to jewelry design sample; Wax mold is made by injecting wax with rubber mold; Plant the wax mold into a wax tree; The cylinder with wax tree is injected into gypsum to make gypsum mold; Put the plaster mold into the oven to dry, and heat until the plaster mold dewaxing; Molten gold is injected into a gypsum mold; Clean and remove plaster, and then polish, inlay and other procedures can be done.

Casting molding generally does not apply pressure, the strength of the equipment and the mold is not high, the size of the product is less limited, and the internal stress in the product is low. Therefore, the production investment is less, and large parts with excellent performance can be produced, but the production cycle is longer, and mechanical processing must be carried out after forming. On the basis of traditional casting, the methods of perfusion, insert casting, pressure casting, rotary casting and centrifugal casting are derived.

2. Classification of casting process

On the basis of traditional casting, the methods of perfusion, insert casting, pressure casting, rotary casting and centrifugal casting are derived. The specific contents are as follows:

① Perfusion. The difference between this method and casting is that the product is removed from the mold after casting; The mold is an integral part of the product itself.

② Inlay casting. A variety of non-plastic parts are placed in the mold cavity, solidified with the injected liquid material, so that it is enclosed in it.

③ Pressure casting. Applying a certain pressure to the material during casting is conducive to injecting the viscous material into the mold and shortening the filling time, which is mainly used for epoxy resin casting.

④ Rotary casting. After the material is injected into the mold, the mold rotates around a single axis or multiple axes at a low speed, and the material is distributed in the inner wall of the mold cavity by gravity, and is shaped by heating and curing. It is used to manufacture spherical, tubular and other hollow products.

⑤ Centrifugal casting. The quantitative liquid material is injected into the mold that rotates at a high speed around a single axis and can be heated, and the material is distributed on the inner wall of the mold cavity by centrifugal force, and the product is solidified into a tubular or hollow tubular by physical or chemical action.

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