Vacuum sucking cast process of preparing magnesium base composite material

Abstract

The present invention relates to casting technology. The vacuum sucking casting process of preparing magnesium base composite material includes the following steps: 1. fixing preheated mold casing onto partition with fixing sleeve and introducing mixed protecting gas; 2. opening the cut-off valve to vacuum pump the sealed cavity and maintaining the vacuum; 3. eliminating vacuum for refined magnesium base composite material melt to be poured into the mold cavity fast, opening the vacuum cut-off valve while pouring to the pouring head of the mold casing for the magnesium base composite material liquid to fill the cavity, and maintaining vacuum unit complete solidification. The present invention proposes new method of vacuum sucking casting and applies vacuum sucking casting method in preparing magnesium base composite material and magnesium alloy part, to form thin-wall complicated magnesium base composite material casting successfully.

Description

technical field [0001] The invention relates to a preparation method in the field of casting technology, in particular to a preparation method for vacuum suction casting of magnesium-based composite materials. Background technique [0002] my country's primary magnesium production ranks first in the world, accounting for one-third of the global production. With the development of my country's automobile industry, magnesium-based composite material technology has broad application prospects. Magnesium-based composite materials are a class of high-tech new materials that have been developed rapidly in the past 30 years. They have high specific stiffness, specific strength, excellent high temperature performance, low thermal expansion coefficient, and excellent wear resistance. They can be used in many fields Instead of traditional materials, such as steel, aluminum alloy, etc. Compared with aluminum-based composites, magnesium-based composites have basically the same performa...

AI Technical Summary

Problems solved by technology

This process replaces the sand box in ordinary sand casting with a metal sheath, and the sand cavity is a cavity, which eliminates the influence of the vaporization speed and decomposition of the lost foam plastic; but this process is mainly suitable for forming cast iron parts, although the patent mentions It can be adapted to the casting of non-ferrous alloys. Practice shows that when using this process to prepare aluminum alloy and magnesium alloy castings, due to the poor air permeability of ordinary sand molds, the vacuum degree in the cavity cannot be improved, and it is difficult to form thin-walled complex parts. ; It is difficult to form aluminum alloy with the process of pouring while vacuuming, mainly because the density of aluminum alloy is much lower than that of cast iron, and it is difficult to control the inclusion and entrainment defects during pouring

Magnesium alloys are easy to burn and oxidize, and their density is lower than that of aluminum alloys. This method cannot be formed, and it is not suitable for the forming of magnesium-based composite materials.

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