Manufacturing of investment molds
In the production, the investment mold is mostly made by pressing the paste mold material into the pressure mold. Before pressing the investment, a thin layer of parting agent must be applied to the surface of the pressing to remove the investment from the pressing. When pressing wax-based molding materials, the parting agent can be motor oil, turpentine, etc.; when pressing resin-based molding materials, a mixture of sesame oil and alcohol or silicone oil is often used as a parting agent. The thinner the parting agent layer is, the better, precision casting， so that the investment mold can better replicate the surface of the pressed mold and improve the surface finish of the investment mold. There are three methods for pressing the investment mold, the plunger pressurization method, the air pressure method and the piston pressurization method.

Investment mold assembly
Investment mold assembly is to combine the investment mold that forms the casting and the investment mold that forms the pouring and riser system. There are two main methods:
1. Welding method Use a flaky soldering iron to melt the connecting parts of the investment mold to weld the investment mold together. This method is more common.
2. Mechanical assembly method In the mass production of small investment castings, mechanical assembly methods have been widely adopted abroad to combine modules. The use of such modules can greatly improve the module combination and efficiency, and the working conditions have also been improved.

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