Conformal forging process of inverted saddle-shaped forge piece

Abstract

The invention provides a conformal forging process of an inverted saddle-shaped forge piece. A flange is manufactured by heating, upsetting, drawing, punching and forging a steel ingot. An upper die and a lower die are closed, then are hung on a movable platform, and next are moved to a press operating platform. After a dovetail groove formed on the upper die is directly connected with a press, a lubricant is coated into an inverted saddle-shaped mould cavity constituted by the upper die and the lower die. The press is lifted to separate the upper die from the lower die; then the flange which is preheated to the temperature of 1,180-1,200 DEG C is placed on the lower die; the press is dropped to close the upper die and the lower die; pressure is maintained for 5-10 minutes; and the forge piece is taken out, is thermally treated at the temperature of 880-920 DEG C for 1.5-2 hours and is then cooled to little allowance for machining to obtain an irregularly shaped main steam inlet connecting pipe. The problems of height lowering and inaccurate die closing and positioning existing in the conventional mould forging are solved, the height of a blank is not increased, the raw material is saved, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a conformal forging process of an inverted saddle-shaped forging. Background technique [0002] CN 10194762 A, "Mold and method for forging special-shaped connecting pipe of steam-water separation reheater of nuclear power plant" published on January 19, 2011, the special-shaped connecting pipe described in it is the main steam inlet connecting pipe, which is saddle-shaped and hollow. It is a large special-shaped thin-walled part. When the piece is manufactured, a forging close to the final shape is forged by heating with a saddle-shaped mold, and then through machining with a small margin, the special-shaped main steam inlet connection is obtained. When the special-shaped connecting pipe is forged, its total height is lowered during the forging process, and the height of the billet needs to be increased to compensate for the unevenness of the small end surface, whic...

AI Technical Summary

Problems solved by technology

When the special-shaped connecting pipe is forged, its total height is lowered during the forging process, and the height of the billet needs to be increased to compensate for the unevenness of the small end surface, which increases the input of raw materials. The huge force generated by the upper and lower molds during the mold clamping process caused the guide pillars to be pushed off, resulting in inaccurate positioning between the upper and lower molds, which affected the forming quality of the forgings

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