Method for constituting steel-ingot drawing-out technique
A steel ingot and process technology, applied in the field of forging, can solve problems such as uneven deformation and difficult forging through, and achieve the effects of improving production efficiency, deformation uniformity and dimensional accuracy
Active Publication Date: 2011-08-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
[0003] The purpose of the present invention is to provide a large-scale steel ingot WHF and FM method drawing process, to solve the existing drawing process can not guarantee the required critical reduction caused by uneven deformation, local difficult forging and other problems, the method of the present invention Formulating the drawing process can make the deformation of forgings uniform, improve the pass rate of forgings and reduce the labor intensity of technicians
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[0045] The forged part in this embodiment is the elongation process of a 280t steel ingot for a support roll, the initial weight of the steel ingot is 450t, and the material of the steel ingot in this embodiment is 60Cr. The initial size (D or H) of the blank is Φ4000mm, the anvil width (W) is 2000mm and the relative reduction (ΔH / H): 20% for WHF method and 11% for FM method. Select K according to steel type 1 =0.473, K 2 =0.43, K 3 =0.782, K 4 = 0.182. According to the method described above, the drawing process of WHF and FM method is formulated, and finally formulated into a table for the on-site personnel to implement.
[0046] As shown in Table 1 and Table 2.
[0047] Table 1 is the process table of WHF forging process
[0048]
[0049] In Table 1, ω represents the turning angle of the billet; ΔL represents the amount of anvil misalignment in different passes during the forging of the billet; ΔX represents the reduction in the X direction; DX represents the dimen...
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The invention belongs to the field of forging, and in particular relates to a method for making a steel ingot stretching process. The method is suitable for a large steel ingot stretching technological process by WHF and FM methods. The method adopts a numerical value simulation technique to study relations among anvil width, blank size, reduction and stretch in the stretching process by the WHF and FM methods, and gives out a common formula to calculate the stretch through data fitting. The stretching process made by the invention can ensure the reduction each time and produces forged piecesof which the cores are deformed evenly and the size meets the requirements. The method can solve the problems that the prior stretching process cannot ensure the required critical reduction to cause uneven deformation, difficult local forging penetration and the like; and the stretching process made by the method can make the forged pieces evenly deformed, improve percent of pass of the forged pieces, and reduce the labor intensity of technologists.
Description
technical field [0001] The invention belongs to the field of forging, and specifically relates to a WHF and FM drawing process for large steel ingots, which is suitable for the WHF and FM drawing process of large steel ingots. Background technique [0002] The physical metallurgical process of steel determines that there will inevitably be various defects inside the steel ingot, such as porosity, shrinkage cavity, hole and so on. If the above defects cannot be eliminated during the forging process and continue to exist, the service life of the forgings will be seriously reduced or even the forgings will be scrapped, especially for large forgings such as backup rolls, rotors, retaining rings, rolls, etc. The elimination of these defects is very important for obtaining high-quality and qualified products. Forgings are especially important. In order to eliminate these defects, forging workers have invented various forging methods, such as JTS forging method, FM forging method,...
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IPC IPC(8): B21C1/00
Inventor 李世键孙明月李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI