Casting process capable of improving shrinkage porosity of shrinkage cavities of casting

Abstract

The invention discloses a casting process capable of improving the shrinkage porosity of shrinkage cavities of a casting. The casting process comprises the steps of (1) combining an upper die and a lower die through a die assembly press machine to form a molding die cavity between the upper die and the lower die; (2) preheating the lower die; (3) melting a casting material into liquid and adding Cand Si microelements into the casting material; (4) injecting the mixed casting material into the molding die cavity from a sprue of the side portion of the lower die at certain pressure until the molding die cavity is filled up with the casting material; (5) continuing to conduct pressurization for 2-5s after the molding die cavity is filled up in the step (4); and (6) cooling the upper die andthe lower die to the normal temperature and then starting the die assembly press machine to separate the upper die from the lower die. Through the casting process, the defects that in the casting process, the shrinkage cavities and shrinkage porosity are formed due to the fact that the cooling and solidifying speed of liquid metal is high, and the temperature of the liquid metal has been obviouslyreduced and the liquid metal is cooled unevenly when the liquid metal flows in a runner in the prior art are overcome.

Description

technical field [0001] The invention relates to the field of casting molds, in particular to a casting process and a casting mold for improving shrinkage cavity and porosity of castings. Background technique [0002] During the metal casting process, the shrinkage cavity and shrinkage defects of the casting are produced because the shrinkage in the final solidification area of ​​the casting is not compensated, or because the alloy solidifies in a mushy state, it is difficult to obtain small liquid areas separated by dendrites. As a result of feeding, during machining, the product scrap rate is high, which affects the customer's processing rhythm and damages the company's interests. How to design the pouring system of the mold and improve the smelting control process plays a decisive role in the control of shrinkage and shrinkage defects. [0003] Therefore, it is an urgent problem to be solved by the present invention to provide a casting process and a casting mold that can ...

AI Technical Summary

Problems solved by technology

[0004] For above-mentioned technical problem, the purpose of the present invention is to overcome the casting mold in the prior art because the sprue on the mould is long during use, and the cooling solidification speed of the high-temperature liquid metal is very fast, and when flowing in the sprue, the liquid metal The temperature has been significantly lowered, resulting in uneven cooling, which leads to the formation of shrinkage cavities and shrinkage porosity, thus providing an improved casting shrinkage cavity shrinkage porosity that can effectively prevent the occurrence of shrinkage cavities and shrinkage porosity in the casting process. casting process and casting mold

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