Die-casting magnesium alloy containing rare earth and forming process of die-casting magnesium alloy

Abstract

The invention relates to the technical field of die-casting processes, in particular to a die-casting magnesium alloy containing rare earth and a forming process thereof.The die-casting magnesium alloy comprises 0.4-0.8 wt.% of zinc, 0.4-0.8 wt.% of lanthanum, 0.4-0.8 wt.% of cerium, 0.4-0.8 wt.% of zirconium and the balance magnesium. According to the die-casting magnesium alloy containing the rare earth and the forming process of the die-casting magnesium alloy containing the rare earth and the forming process of the die-casting magnesium alloy containing the rare earth, simulation software is adopted for conducting simulation analysis on a magnesium alloy die casting; model establishment, grid division, boundary condition setting, process parameter setting and result analysis are sequentially carried out, and based on orthogonal test design, the optimal die-casting forming process is obtained by comparing the influences of the process parameters such as pouring temperature, mold temperature, injection speed and dwell time on the shrinkage rate and the hot crack tendency index. According to the die-casting magnesium alloy containing the rare earth, the result of casting defects is analyzed through software, the limitation that the mechanical performance is optimized through repeated production tests is improved, the production period is shortened, the test casting cost is reduced, and the casting quality is improved.

Description

technical field [0001] The invention relates to the technical field of die-casting technology, in particular to a rare-earth-containing die-cast magnesium alloy and a molding process thereof. Background technique [0002] Magnesium (Mg) and its alloys are the lightest metal structural materials with high specific strength, specific stiffness, high recyclability, and commercial availability. Magnesium alloys are expected to partially replace aluminum alloys and steels. Therefore, it is widely used in electronics, automobiles and aviation. The application in the aerospace industry has attracted great attention. In the field of magnesium alloys, rare earth elements play an important role in refining grains and improving mechanical properties. At present, the cost of rare earth elements is too high, which hinders the development of rare earth magnesium alloys. By controlling the amount of rare earths added and screening the types of rare earth elements to be added, the cost can ...

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Problems solved by technology

[0002] Magnesium (Mg) and its alloys are the lightest metal structural materials with high specific strength, specific stiffness, high recyclability and commercial availability. Magnesium alloys are expected to partially replace aluminum alloys and steels. Therefore, it is widely used in electronics, automobiles and aviation. The application in the aerospace industry has attracted great attention. In the field of magnesium alloys, rare earth elements play an important role in refining grains and improving mechanical properties. At present, the cost of rare earth elements is too high, which hinders the development of rare earth magnesium alloys. The cost can be effectively reduced by controlling the amount of rare earth added and screening the types of rare earth elements added. High pressure die casting (HPDC) is an efficient and economical precision manufacturing method that can be used for mass production of magnesium alloy parts in different industries. At present, about 90% of the cast magnesium alloys are manufactured by HPDC. The remarkable feature of the HPDC process is the high cooling rate during the solidification process, but during the casting process, the defects generated will have an adverse effect on the mechanical properties of the castings, which are optimized through repeated production tests Mechanical properties and controlling their variability can be very time-consuming, so it is necessary to use numerical simulation methods to obtain a die-casting molding process for magnesium alloy castings containing rare earths

[0003] The patent CN113722964A discloses a casting simulation method. The casting simulation software ProCAST is used to simulate and analyze the ductile iron support, so as to design a better gating system, which can reduce the cost of trial casting, shorten the production cycle of parts, and reduce the guarantee of defects. The process performance of the parts and the quality of the bearing castings are qualified products, which meet the requirements of the bearing process performance. Patent CN111004946B The invention relates to a die-casting molding process of an aluminum alloy gearbox clutch housing. ProCAST software is used to process the clutch housing of the gearbox Carry out CAE simulation on the body die-casting process, and obtain the die-casting process parameters under the condition of the smallest defects such as shrinkage porosity and shrinkage cavity. Patent CN110205526B discloses an aluminum alloy automotive oil cooler casting and its die-casting process, which is selected by comparing ProCAST software with the actual process Appropriate pouring temperature, injection specific pressure, injection speed, and pressure holding time can reduce the occurrence of defects such as cold shut, air entrainment, and shrinkage cavity, but rare earth magnesium alloy has a high melting point and poor fluidity. Process parameters are more difficult

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