Process for vacuum pressure casting copper parts

Abstract

A vacuum-pressure casting technology for copper product includes such steps as smelting in furnace, sealing the furnace body, isolating the molten copper from O2 contained gas, pressurizing to furnace body for overflow of molten copper, delivering the molten copper via vacuum tube into a metallic mould from its bottom, and solidifying.

Description

technical field [0001] The invention relates to a copper vacuum pressure casting process. Background technique [0002] Cast copper alloy has good mechanical properties, casting performance, corrosion resistance, and the casting structure is fine, so it is widely used in various industrial products such as automobiles, ships, petrochemicals, machinery and equipment, so the casting process of copper is well known Pay attention to. However, there are several problems in the existing copper casting process. One is that the shrinkage rate of copper is large, and the shrinkage rate of pure copper is about 4.5%. So the casting cost is very high. The second is that traditional casting molds have sand molds and wax molds. Their nozzles are on the top or side of the mold. When the copper liquid is injected into the mold, it is extremely difficult to completely empty the air in the mold, so that there are a large number of defects in the casting, and the yield rate cannot be obtaine...

AI Technical Summary

Problems solved by technology

However, there are several problems in the existing copper casting process. One is that the shrinkage rate of copper is large, and the shrinkage rate of pure copper is about 4.5%. So casting cost is very high

The second is that traditional casting molds have sand molds and wax molds. Their nozzles are on the top or side of the mold. When the copper liquid is injected into the mold, it is extremely difficult to completely empty the air in the mold, so that there are a large number of defects in the casting, and the yield rate cannot be obtained. improve

The third is that pure copper itself has strong oxygen absorption. It is cast by traditional technology. During the casting process, it is in contact with air for too long, absorbing a large amount of gas and forming bubbles, which makes the casting solid have pores and hydrogen embrittlement.

For electrical castings, it will increase the resistance and reduce the conductivity

Fourth, pure copper has a high melting point and fast cooling, which reduces the fluidity of copper liquid and makes it impossible to cast complex copper parts