3. Surface spray metal mold
A layer of atomized molten metal is sprayed on the outer mold made by RP technology, and the metal surface is formed after the liquid metal is solidified. The spraying equipment and the master mold are limited by temperature. Generally, the metal material used is a low melting point metal such as lead-tin alloy, zinc alloy and nickel. The common spraying method is arc spraying. If the master can withstand high temperatures, it can also be sprayed with high melting point metals such as stainless steel.
The life of such a mold for injection molding can reach about 2,500 pieces, and it is impossible to use a larger clamping force than a pure metal mold. The research results show that if nickel is sprayed on the surface of the master mold, the service life of the mold can be further improved. Because of its high surface hardness and wear resistance, the corrosion resistance is good, and the injection molded parts are easy to take out after the mold is opened. Such a mold can be completed in less than two days. It is worth noting that the temperature of the use of such molds cannot exceed 300 °C.