The Producing Process of Stainless Steel Casting Parts

Date:05-02-2018

Stainless steel casting parts not only applies to all types, all kinds of alloy casting, and the production of casting dimensional accuracy, surface quality higher than other casting methods, and even other casting methods difficult to cast complex, high temperature, not easy to process the casting , Can be cast precision casting cast too.

The so-called investment casting process, simply put it is made of meltable fusible material model, coated with several layers of special fire-resistant coating on it, after drying and hardening to form a whole shell, then steam or hot water from The mold is melted, the mold is placed in a sand box, the sand is filled with dry sand, and the mold is placed in a baking furnace and calcined at a high temperature, and the mold or the shell is fired after being cast therein Molten metal to obtain castings.

Investment casting dimensional accuracy higher, generally up to CT4-6, of course, due to the complexity of investment casting process, casting dimensional accuracy factors, such as mold shrinkage, melting deformation, the shell in the heating and The cooling process of the change in the amount of wire, alloy shrinkage and the deformation of the casting during solidification, so ordinary die-castings, although the higher dimensional accuracy, but the consistency still needs to be improved.

Molding press, the cavity surface finish with high pressure, therefore, the surface finish of the investment is relatively high. In addition, the shell is made of high temperature resistant special binder and refractory coating made of refractory coating coated on the melt made of the molten metal in direct contact with the cavity surface finish. Therefore, the investment casting surface finish than the average casting high, generally up to Ra.1.6 ~ 3.2μm.

The biggest advantage of investment casting is due to the investment casting has a high dimensional accuracy and surface finish, it can reduce the machining work, but the parts require higher parts to leave a little allowance, and even some of the castings only Leave grinding, polishing allowance, you can use without machining. Thus, the use of investment casting method can save a lot of machine tools and processing time, a substantial saving of metal raw materials.

Another advantage of the investment casting method is that it allows the casting of complex castings of various alloys, in particular of superalloy castings. Such as jet engine blades, its streamlined profile and the cooling cavity, using mechanical processing is almost impossible to form. With investment casting process can not only do mass production, to ensure the consistency of the casting, and to avoid residual machining after machining stress concentration.