This is the process where the mould is China precision machining prepared around an expendable pattern. Casting processes in which the pattern is used only once are variously referred to as "lost-wax" or "precision-casting" processes. In any case they involve making a pattern of the desired form out of wax or plastics (usually polystyrene).
The first step in this process is the China precision machining preparation of pattern for every casting made. To do this, molten wax which is used as the pattern material is injected under pressure of about 2.5 MPa into a metallic die which has the cavity of the casting to be made.
The wax when allowed to solidify would produce the pattern. To this wax pattern, gates, runners and any other details required are appended by applying heat.
The process has been described as the lost wax, precision casting, and investment
casting process. The last-dimensional name has been generally accepted to distinguish the present industrial process from artistic, medical, and jewelry applications.
The basic steps of the investment casting process are as follows
1. Production of heat disposable patterns, usually in wax or plastic.
2. Assembly of these patterns onto a gating system.
3. Investing, or covering the pattern assembly with ceramic to produce a
4. Melting out the pattern assembly to leave a precise mold cavity.
5. Firing the ceramic mold to remove the last traces of the pattern material, to fire the ceramic andChina precision machining develop the high temperature bond, and to preheat the mold ready for casting.
7. Knock-out, cut off, and finishing.