Forging method for efficiently healing steel ingot internal hole type defects by using small pressure

Abstract

The invention relates to the field of forging, and particularly relates to a forging method for efficiently healing steel ingot internal hole type defects by using small pressure. The forging method can be applied to an open die forging process of directly drawing steel ingots with various sizes into shaft members. The method includes the following steps: 1), performing pre-drawing on the steel ingot after clamp pressing, chamfering and unnecessary riser cutting; 2) using an upper flat anvil and a lower flat anvil to perform two-pass one-way large deformation on a blank; 3) re-melting and re-heating the blank, and keep warming after one-way large deformation; 3) turning over the blank 90 degrees, and drawing the blank by using the upper flat anvil and the lower anvil. The forging method can be applied to the open die forging process of directly drawing the steel ingots with various sizes into the shaft members, can heal the steel ingot internal hole type defects, and can greatly reduce the possibility of scrap of a forge piece due to poor forging joint caused by a loose center. The forging method needs the small pressure, can forge large forge pieces by using a small compressor, and expands the application range of the small compressors.

Description

technical field [0001] The invention belongs to the field of forging, and specifically relates to a forging method for efficiently healing internal hole-type defects of a steel ingot with a small pressure, and is suitable for the free forging process of forging steel ingots of various sizes into shaft parts. In the case that the pressure of the press is too small to upset a large steel ingot, but can only be directly elongated, this method can effectively heal the hole-type defects inside the steel ingot. Background technique [0002] Forging is an important process in the processing of most metal materials. Through forging, the internal quality of forgings can be improved, that is, the as-cast structure is broken, the grains are refined, the structure is uniform, and the shrinkage cavity and pores produced by the metal during the smelting process can be forged. Defects such as cracking and porosity are of great significance to improving the quality of forgings. [0003] Du...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a forging method that uses small pressure to efficiently heal the hole-type defects inside the steel ingot, so as to solve the problem that the small-pressure press cannot forge the hole-type defects inside the steel ingot through repeated upsetting and drawing processes, especially the loose axis question

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