Hot impact extrusion process and device for large annular barrel type forged piece

Abstract

The invention relates to a hot impact extrusion process and a device for a large annular barrel type forged piece, which belongs to the technical field of hot forming of a large hollow forged piece. The process comprises the following steps: firstly, an extrusion cushion is placed on a press platform; secondly, the blanks to be heated are put on the extrusion cushion; thirdly, an extrusion cylinder is sleeved on the extrusion cushion; fourthly, a profiling punch is applied with force so that a mold cavity is filled with the blanks; fifthly, the lubricant is added; sixthly, a solid punch is applied with force so that the blanks are extruded to the set position of the process; seventhly, a hollow punch is sleeved on the solid punch and applied with pressure, so that the blanks are extruded to the set positioned of the process; eighthly, the extrusion cushion is taken out and a bottom flushing drain cap is replaced; and ninthly, the core material at the bottom is flushed out through the hollow punch. The devices required for finishing the process comprise an extrusion cylinder, an extrusion cushion, a profiling punch, a solid punch, a hollow punch, a solid extension rod, a hollow extension rod and a bottom flushing drain cap. The invention solves the difficult problems existing in the large annular barrel forged piece of long process flow of free forging, more forging times and large reverse extrusion molding for die forging and improves the utilization ratio of the material and the molding quality of the forged piece.

Description

technical field [0001] The invention belongs to the technical field of thermoforming of large hollow forgings, and in particular relates to a hot stamping and extrusion molding process and device for large ring-type forgings. Background technique [0002] At present, there are mainly two forming methods for large ring cylinder forgings at home and abroad. The first method is free forging, that is, after the blank is punched, the mandrel is elongated or the hole is expanded. The disadvantages of this method are many times of firing, long process, poor controllability, uneven deformation, and the end of the forging. The surface is prone to forging cracks and the precision of the parts is low. There are two types of punches for punching: solid punches and hollow punches. The purpose of saving labor can be achieved, but it will cause waste of punching core material. The second method is die forging, reverse extrusion punching and then punching out the bottom core material. Thi...

AI Technical Summary

Problems solved by technology

The first method is free forging, that is, after the blank is punched, the mandrel is elongated or the hole is expanded. The disadvantages of this method are many times of firing, long process, poor controllability, uneven deformation, and the end of the forging. The surface is prone to forging cracks and the precision of the parts is low. There are two types of punches for punching: solid punches and hollow punches. It can achieve the purpose of saving labor, but it will cause waste of punching core material

The second method is die forging, reverse extrusion punching and then punching out the bottom core material. This method requires equipment with a larger tonnage

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