Pressing die and pressing process for welding neck flange

Abstract

The invention provides a pressing die for a welding neck flange. The pressing die comprises an upper forming die, a lower forming die and an expanding ball. The upper forming die and the lower forming die are vertically buckled, and the expanding ball is used for expanding. A cavity of the welding neck flange is defined by the upper forming die and the lower forming die. A core rod is arranged in the center of the end face of one end of the upper forming die. An inwards-sunken face matched with the ball surface of the expanding ball is arranged at the tail end of the core rod. In the process for pressing the welding neck flange through the die, selected raw materials are blanked and placed in a performing die for pre-forging forming, the pre-forged and formed welding neck flange is placed in the lower forming die of the die, the core rod of the upper forming die jacks and vertically presses the expanding ball, an inner hole of the welding neck flange is expanded, the length of the neck of the flange is increased, after pressing is finished, the welding neck flange is subjected to finish turning, and a finished product is obtained. The welding neck flange is manufactured through the die and the process, the forming process is simple, the forming appearance is good, the machining allowance is small, the mechanical property is excellent, the organization structure is uniform, and the defects of cast flanges and wholly-forged flanges can be overcome.

Description

technical field [0001] The invention relates to the technical field of flange forming dies, in particular to a high neck flange pressing die. Background technique [0002] Existing high-neck flanges generally adopt casting or integrally forged round steel for turning and forming. Casting flanges have poor mechanical properties, and are prone to inclusions and pores, so they cannot be used on pressure-bearing equipment; while forging round steel as a whole, the method of turning and forming has large machining allowances, long working hours, and low production efficiency. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a high-neck flange pressing mold and a process for pressing the high-neck flange using the mold. The high-neck flange is produced by molding, which has a simple molding process and a good shape. The machining allowance is small, the mechanical properties are excellent, and the structure is uniform....

AI Technical Summary

Problems solved by technology

Casting flanges have poor mechanical properties, and are prone to inclusions and pores, so they cannot be used on pressure-bearing equipment; while forging round steel as a whole, the method of turning and forming has large machining allowances, long working hours, and low production efficiency.

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