A method for the overall forming of thick-walled hollow forgings with special-shaped end faces and outer circles with bosses

Abstract

The invention discloses an integrated forming method for a thick-wall hollow forge piece with a boss on the abnormal end face excircle. The method comprises the following steps: (1) obtaining a forge piece part graph comprising the shape and the size, (2) adopting a simulation die forging process to optimize the shape of a forge blank according to the shape and the size of a forge piece, and adopting the size invariable principle to calculate the size value of the forge value, (3) designing a combined die according to the forge piece and the forge blank, (4) die forging. According to the method, the forge blank is prefabricated, and the combined die is manufacture so as to conduct one-time die forging, so that forming effect is good, forging permeability is good, and a forging piece streamline is complete.

Description

technical field [0001] The invention belongs to the technical field of forging, and mainly relates to an integral near-net forming forging method of a thick-walled hollow forging with a special-shaped end face and a boss on the outer circle. Background technique [0002] In the production, the thick-walled hollow forgings with spatial curved surfaces at both ends and bosses on the outer circle are often forged as thick-walled cylindrical forgings after adding more process pieces on both ends and the outer circle according to the largest contour. The process route generally adopted in the traditional free forging production of thick-walled cylindrical forgings is: upsetting, punching, and mandrel elongation (horse bar reaming). Due to the substantial increase of the wall thickness and length of the forging, it has a great impact on the forging operation and the quality of the forging, especially the increase in the wall thickness has the greatest impact on the mechanical prop...

AI Technical Summary

Problems solved by technology

Due to the large increase in wall thickness, the forgeability of the forging is poor, and the increase in the tensile stress at the end during the drawing of the mandrel increases the tendency of the end face to crack. It is difficult to meet the requirements of UT flaw detection, T / 4 sampling performance and impact performance, and the repair rate and scrap rate are very high in production (the first-time pass rate is only about 60%)

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