Machining method of magnesium casting piece

Abstract

The invention provides a method for machining magnesium castings, which relates to the technical field of mechanical processing, and comprises the following steps: (1) heating the magnesium castings to 150-200°C and maintaining them for 15-20 minutes; The temperature of the cast magnesium is rapidly cooled to 80-100°C within half a minute, and maintained within the temperature range of 80-100°C for 20-25 minutes; (3) The cast magnesium is then rapidly heated to 200-250°C within half a minute Afterwards, machining is carried out in the temperature range of 200‑250 °C. In the present invention, the rapid cooling and rapid heating of cast magnesium can completely release the stress inside the casting, which can effectively avoid the fracture of the casting during processing; at the same time, the mechanical processing is carried out at a temperature of 200-250 ° C, because the casting itself has There is temperature, so the heat generated locally by machining is negligible and will not cause deformation damage to the casting.

Description

technical field [0001] The invention relates to the technical field of machining, in particular to a machining method for magnesium castings. Background technique [0002] Magnesium castings are a general term for alloys mainly composed of iron, carbon and silicon. In these alloys, the carbon content exceeds that which would remain in austenitic solid solution at the eutectic temperature. [0003] In order to apply magnesium castings to mechanical parts, it is also necessary to machine the magnesium castings. The existing machining methods for magnesium castings have the following technical problems: [0004] 1. It is carried out at room temperature. When processing magnesium castings, due to the generation of local heat during processing, there will be a certain deformation of the castings; [0005] 2. The internal stress release of the casting is not complete, the torsion force generated is large, and it is easy to break during the processing. For example, the ordinary m...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a machining method for magnesium castings to solve the technical problems of large processing deformation and low processing yield due to incomplete internal stress release of castings in existing machining methods for magnesium castings