Liquid forging forming method for welding-neck flange, forming die and forming device

Abstract

The invention discloses a liquid forging forming method for a welding-neck flange, a forming die and a forming device. The liquid forging forming method includes the following steps that firstly, molten metal is injected into a die cavity between an upper die and a lower die of the forming die; secondly, the upper die moves downwards relative to the lower die so as to compress the disc forming part of the die cavity, and an extrusion ring slides in a groove to compress the neck forming part of the die cavity; and thirdly, after a liquid-forged piece is cooled, the liquid-forged piece is taken out. According to the liquid forging forming method for the welding-neck flange, the forming die and the forming device, in the compression process of the die cavity, except for the main compression action of moving the upper die downwards relative to the lower die to compress the disc forming part, the extrusion ring can slide in the groove relative to the groove wall, and the additional compression action of the neck forming part is achieved; and in fact, pressure on the molten metal in the neck forming part is further enhanced through the extrusion ring, the neck portion, with compactness the same as that of the disc portion, of the liquid-forged piece is obtained, and the pressure applying effect of the neck portion of the welding-neck flange of the forming die is improved.

Description

technical field [0001] The invention relates to a liquid forging forming method, a forming die and a forming device for a high neck flange. Background technique [0002] At present, flanged parts are generally formed by a certain forming method, and then the parts are machined to obtain the final product. Ordinary flange parts are composed of an annular disk part and a neck coaxially arranged at its upper end, and the heights of the disk part and the neck are similar. The neck height of the high-neck flange (that is, the distance from the top surface of the neck to the bottom surface of the disc) is much greater than the height of the disc (that is, the distance between the top and bottom surfaces of the disc). In the traditional process, the high-neck flange is usually formed by hot pressing die forging. For example, the high-neck flange die forging method disclosed in Chinese patent document CN 104785706 A is to use a free-forging liquid hammer for the heated bar material...

AI Technical Summary

Problems solved by technology

In this way, the pressure effect of the punch on the flange neck and the disc will be different, causing the structure and performance of the flange neck to be lower than that of the disc, resulting in uneven performance of the flange

On the other hand, the quantitative accuracy of the current common liquid die forging pouring method is not high, which reduces the precision of the workpiece and affects the quality of the workpiece

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