Investment casting is a casting method relative to the traditional casting process. It can obtain relatively accurate shape and high casting precision. The more common method is: first design and manufacture the mold according to the product requirements (with a very small or no allowance), cast wax by casting method to obtain the original wax pattern; repeat coating and sanding on the wax pattern process, hardening the shell and drying; then melting the internal wax pattern for dewaxing to obtain the cavity; roasting the shell to obtain sufficient strength; pouring the required metal materials; clearing the sand after shelling, so as to obtain High-precision finished product. According to product needs or heat treatment and cold processing.
Investment Casting Process Design
Like general casting process design, the tasks of investment casting process design are:
(1) Analyze the manufacturability of the casting structure;
(2) Select a reasonable process plan, determine the relevant casting process parameters, and draw the casting diagram on the basis of the above;
(3) Design the gating system and determine the module structure.
When considering the above three aspects, the main basis is still the basic principles of the general casting process, especially when determining the process plan and process parameters (such as casting fillets, draft angles, machining allowances, process ribs, etc.), Except that the specific data are slightly different due to the process characteristics of investment casting, the design principle is exactly the same as that of sand casting.