A forging method using small pressure to efficiently heal cavity-type defects inside steel ingots
A technology of internal holes and pressure, applied in the field of forging, can solve the problems of forged steel ingots and axis looseness, and achieve the effect of increasing the internal strain of the billet, reducing scrap, and expanding the application range
Active Publication Date: 2017-11-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[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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[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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The invention belongs to the field of forging, and specifically relates to a forging method for efficiently healing internal hole-type defects of large steel ingots with a small pressure, and is suitable for free forging processes in which steel ingots of various sizes are directly elongated into shafts. The method comprises the following steps: 1) pre-drawing the steel ingot after the process of pressing the clamp, chamfering, and cutting off the redundant riser; 2) using the upper and lower flat anvils to perform two-pass unidirectional large deformation on the blank; 3) After large deformation in one direction, return the billet to the furnace to reheat and keep warm; 3) Turn the billet 90°, and use the upper and lower flat anvils to elongate. The invention is applicable to the free forging process of forging steel ingots of various sizes into shaft parts, can ensure the healing of hole-shaped defects inside the steel ingots, and greatly reduces the possibility of forgings being scrapped due to loose center and unforged. The forging method proposed by the invention requires less pressure, and larger forgings can be forged with a small press, thereby expanding the applicable range of the equipment.
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...
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IPC IPC(8): B21K1/06B21J5/06
Inventor 徐斌孙明月李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI