Necking and flaring mixed forming method for conical barrel part with straight barrel

Abstract

The invention belongs to the field of manufacturing, and particularly relates to a necking and flaring mixed forming method for a conical barrel part with a straight barrel. The method can be used for extrusion manufacturing of the conical barrel part. The method comprises the following steps that firstly, a circular-truncated-cone-shaped and cylindrical integrated pipe blank with equal inner diameter and big-end-up outer diameter is prepared through machining; primary hot compression necking is carried out on the pipe blank by utilizing a lower concave die to form the straight barrel with a small diameter at the lower end; and finally, a flaring pressing die is used for performing flaring twice to form the conical barrel part with the large-diameter upper end and the small-diameter lower end. In order to prevent instability during necking of the pipe blank, the upper end of the pipe blank is cooled (the cooling mode is water cooling) before necking deformation, and a protection die is additionally arranged inside the female die; and compared with a traditional free forging process, the forming process is high in forming efficiency, good in size precision and few in forming procedure and heating number, and improves the part structure performance.

Description

technical field [0001] The invention belongs to the field of manufacturing, in particular to a shrinking and flaring mixed forming method for a tapered cylindrical part with a straight cylinder, which can be used for extrusion manufacturing of the tapered cylindrical part. Background technique [0002] The traditional free forging manufacturing method is a free forging process. After the steel ingot is blanked, it is subjected to upsetting, punching, and reaming, and then it is drawn into a cone-shaped blank with a V-shaped anvil mandrel, and then reamed to form a large cone. Shape the cylinder, and finally shape the basically formed cylinder or use a special mold to complete the molding. The forming steps of this process are cumbersome and complicated, and it is difficult to control the shape and size of the blank during the process of elongation and hole expansion. A large working margin is required to ensure the dimensional accuracy of the product, resulting in waste of m...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a shrinking and flaring mixed forming method for a tapered cylindrical part with a straight cylinder to solve the problems of large margin of finished product, low material utilization rate and poor forging stability in free forging of a conical cylindrical part with a straight cylinder.

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