Control tooling and method for spinning deformation temperature field of large-sized high rare earth magnesium alloy barrel-shaped piece

Abstract

The invention relates to a control tooling and method for a spinning deformation temperature field of a large-sized high rare earth magnesium alloy barrel-shaped piece. Aiming to structural characteristics and material characteristics of the high rare earth magnesium alloy barrel-shaped spinning piece, the adjusting and control tooling special for uniformity of the spinning deformation temperaturefield is designed, design of a structure with a spinning die provided with a center hole, a hollow annular steel frame provided with a heating pipe, a pressing bolt and a tail top is adopted, so thata deformation zone of a high rare earth magnesium alloy barrel billet obtains the bidirectional heating effect in the whole spinning deformation process, so that the uniformity of the temperature field of the deformation zone of the high rare earth magnesium alloy barrel billet in the whole spinning process is realized, the temperature gradient of the inner wall and the outer wall of the deformation zone of the high rare earth magnesium alloy barrel billet is reduced or eliminated, spinning cracks are avoided, and the forming quality and precision of the large-sized high rare earth magnesiumalloy barrel-shaped spinning piece is ensured. The control tooling for the spinning deformation temperature field of the large-sized high rare earth magnesium alloy barrel-shaped piece is simple and efficient in operation process, suitable for batch processing, and has high operability and practicability.

Description

technical field [0001] The invention relates to a large-size high-rare-earth magnesium alloy cylindrical piece spinning deformation temperature field control tooling and control method, belonging to the technical field of cabin manufacturing, the large size refers to the inner diameter of the cylindrical piece is not less than Φ750mm, The height of the shaped 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). Temperature field control refers to the uniformity of the temperature field in the deformation zone of the cylindrical part during spinning. Control, that is, to ensure that the temperature of the deformation zone and the outer wall of the magnesium alloy cylindrical part are basically the same during the entire spinning deformation process, and the temperature of the deformation zone of the magnesium alloy cylindrical part is controlled at 440-470 °C during the enti...

AI Technical Summary

Problems solved by technology

[0003] For large-scale high-performance high-rare-earth magnesium alloy cylindrical parts with an inner diameter ≥ Ф750mm, a height ≥ 600mm, and a wall thickness ≤ 5mm, the ring-machining method is generally used for preparation. This method has the following disadvantages: Large-scale magnesium alloy rings in There will be serious anisotropy of mechanical properties in the process of ring rolling and extrusion, and the above problems cannot be improved in the subsequent heat treatment and mechanical processing. Therefore, the above phenomena will continue to the final magnesium alloy cylindrical parts ; In addition, the ring is formed into a high rare earth magnesium alloy cylindrical part by machining, and there are still a series of problems such as extremely low material utilization rate, high product cost, and low production efficiency.

However, the spinning forming of magnesium alloy cylindrical parts has the following difficulties: because the plastic deformation ability of magnesium alloy is poor at room temperature, it must be hot spinning at a higher temperature, and the temperature field in the deformation zone is uniform during the hot spinning process at high temperature The stability cannot be guaranteed, which can easily lead to a large temperature gradient on the inner and outer walls of the magnesium alloy tube billet, resulting in spin cracking, leading to the direct scrapping of the component

The experience of the prior art is to use the spray gun to heat the spinning die first, then fix the billet on the spinning die to start spinning and heat the outer wall of the billet during the whole rotation. In this method, the inner wall of the billet can only pass through its outer wall and The mold conducts residual heat to compensate for heating, and the temperature gradient between the inner and outer walls of the tube billet is relatively large, resulting in uneven temperature field in the deformation zone of the magnesium alloy cylindrical part, and spinning cracks are very easy to appear, which seriously affects the forming of the magnesium alloy cylindrical part Quality and Forming Accuracy

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