A rapid assembly/de-molding tooling and method for a large-size high-rare-earth magnesium alloy cylindrical part

Abstract

The invention relates to a large-size high-rare-earth magnesium alloy cylindrical part rapid molding / demolding tool and method, and belongs to the technical field of cabin manufacturing. The structuredesign with a spinning mold with the top end being provided with a circular hole, a pressing ring with the bottom end provided with a small solid cylinder, a pressing bolt and a discharging ring is adopted, rapid molding / demolding of a high-rare-earth magnesium alloy cylindrical blank and a cylindrical spinning part is achieved, the initial temperature of spinning deformation is ensured, the working efficiency is improved, potential safety hazards during high-temperature assembling are avoided and eliminated, and the forming quality of the large-size high-rare-earth magnesium alloy cylindrical spinning part is advantageously improved; in addition, thick flaky precipitated phases influencing the mechanical performance are prevented from being formed in the slow cooling process of the large-size high-rare-earth magnesium alloy cylindrical spinning part after spinning is completed, and guarantee is provided for high performance. The method is simple and efficient operation process and suitable for batch processing and has high operability and practicability.

Description

technical field [0001] The invention relates to a large-size, high-performance, high-rare-earth magnesium alloy cylindrical piece quick assembly / demoulding tooling and a mounting / demoulding method, belonging to the technical field of cabin manufacturing. The large size refers to that the inner diameter of the cylindrical piece is not less than Φ750mm, the height of the cylindrical part is not less than 600mm, high rare earth means that the mass content of rare earth elements in the magnesium alloy is not less than 10% (mass percentage), fast means that the time for loading / unmolding is not more than 10s, and mold loading means Before spinning, the high-rare-earth-magnesium alloy tube billet and the spinning mold are clamped and positioned. Demolding means that the high-rare-earth magnesium alloy cylindrical spinning part is separated from the spinning mold after spinning. Background technique [0002] The plastic deformation ability of high rare earth magnesium alloy at room...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the method of preheating the large-size high-performance high-rare-earth magnesium alloy billet includes: after the high-rare-earth magnesium alloy billet and the spinning die are clamped and positioned, the billet is directly preheated with an oxygen-acetylene spray gun. The problem of this method is that there will be a series of problems such as long heating time and low heating efficiency.

The heating efficiency of this method can be significantly improved, and the temperature distribution of the high rare earth magnesium alloy billet after preheating is relatively uniform, but there will be safety hazards when the high rare earth magnesium alloy billet is clamped and positioned with the spinning die at high temperature ( It is easy to cause burns to the operator) and the temperature drop caused by the low assembly efficiency is too fast; in addition, the high rare earth magnesium alloy cylindrical parts must be cooled rapidly after hot spinning, otherwise the high rare earth magnesium alloy will be damaged inside during the slow cooling process. Coarse flaky precipitates are formed, which cannot be eliminated in the subsequent heat treatment process, which seriously damages the mechanical properties of high rare earth magnesium alloy cylindrical parts

The experience of the existing technology is to preheat the high rare earth magnesium alloy tube billet in a heat treatment furnace, install it with the spinning mold after reaching the temperature, and then carry out spinning forming; After the spinning parts are cooled to room temperature, demoulding is carried out. These methods have assembly safety hazards, low assembly efficiency before the spinning starts, resulting in excessive temperature drop, and high REE caused by rapid cooling after spinning cannot be quickly demolded. Insufficient performance of magnesium alloy cylindrical spinning parts and other problems limit the precision spinning of large-scale high rare earth magnesium alloy cylindrical parts and the improvement of their mechanical properties

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