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

A technology of internal holes and pressure, which is applied in the field of forging, can solve the problems of axis looseness and forged steel ingots, and achieve the effects of reducing scrap, increasing internal strain of blanks, and expanding the scope of application

Active Publication Date: 2016-08-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment

[0041]In this embodiment, three steel ingots are used, each weighing about 8 tons, the material is 27SiMn, and the heating temperature of the blank before forging is 1200°C. The dendrites of this steel are very developed during the solidification process, and it is easy to form large shrinkage cavity and loose defects in the core. The press used is 2,000 tons, and there is no upsetting plate, so the upsetting process cannot be used for the steel ingot, and it can only be drawn directly. According to the forging method proposed by the present invention, use 400mm wide upper and lower flat anvil forging. First, pre-drawing is carried out, and the cross-section of the steel ingot is drawn to a square of 600 mm (that is, the cross-section is a square with a side length of 600 mm). Afterwards, two passes of unidirectional large deformation are carried out. The reduction in the first pass is 150mm, and the reduction in the second pass is 90mm. After pressing the billet into a flat ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/06B21J5/06
Inventor 徐斌孙明月李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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