Hot-spinning cogging method based on nonuniform heating of aluminum alloy

Abstract

The invention belongs to the field of machining of metallic materials and particularly relates to a hot-spinning cogging method based on nonuniform heating of aluminum alloy. According to the method, a nonuniform heating way is adopted, so that the temperature of a mandrel and the temperature of a discharging ring are made higher than that of an aluminum alloy billet, and the temperature of the upper end of the aluminum alloy billet is higher than that of the lower end of the aluminum alloy billet. The metal fluidity in the aluminum alloy billet is good, and cracks caused by spinning tensile stress are avoided; the hardness and strength of the outer surface of the aluminum alloy billet are relatively high, the aluminum alloy billet is unlikely to adhere to a spinning roller, the surface quality of the hot-spun billet is good, and the generatrix of the billet is straight; and by the adoption of the method, the temperature of a hot-spinning deformation area can be well controlled, the surface quality of the billet which is hot-spun through the heating method is good, the rate of finished products is high, and the dimensional precision is high.

Description

technical field [0001] The invention belongs to the field of metal material processing, and in particular relates to a hot spinning blanking method of unevenly heated aluminum alloy. Background technique [0002] Spinning is developed in modern times. It is an advanced metal plastic forming process without cutting processing that combines casting, extrusion, stretching, bending, ring rolling, cross rolling and rolling extrusion. Under the high pressure, the metal is processed into the required hollow rotating body point by point. In actual production, often due to the limited power of spinning equipment, when spinning large and thick blanks, the use of hot spinning method can reduce material deformation resistance, reduce spinning pressure, and use existing equipment more effectively. [0003] Precise control of the actual temperature in the deformation zone of the aluminum alloy billet is one of the key technologies for aluminum alloy hot spinning billet opening. In the a...

AI Technical Summary

Problems solved by technology

In the actual spinning process, due to the deformation process of the aluminum alloy, the friction between the blank and the mandrel, and between the blank and the rotary wheel will generate a lot of heat, which will easily lead to excessive temperature in the deformation zone, resulting in metal deformation during the spinning process. Stacking, billet cracking, bus bar dimensional accuracy out-of-tolerance and other problems

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