Forging method for improving roll blank net shape level by using radial forging machine

Abstract

The invention relates to a forging method for improving roll blank net shape level by using a radial forging machine, and belongs to the technical field of metallurgical mechanical manufacturing. Theforging method aims at solving the problems of high cost, long production cycle and limited forging precision of an existing improved net shape method, the forging method for improving the roll blanknet shape level by using the radial forging machine comprises the following steps that after a blank material is heated to a certain temperature, upsetting and drawing are performed, the obtained blank material is hot-transferred to a forging area of the radial forging machine and it is guaranteed that the surface temperature of the blank material is controlled at 900 DEG C-920 DEG C, a roller body forging pass, a A-side roll neck forging pass, a B-side roll neck forging pass and a finishing forging pass are sequentially performed by using the radial forging machine, air cooling is performed for a certain time before finishing forging pass to control the forging temperature at a lower limit of the final forging temperature 850 + / - 10 DEG C, and the blank material is forged into a finishedproduct by controlling the rolling reduction of the finish forging pass according to the deformation rate of 87.3%. The method can be applied to roll blank manufacturing production, and can achieve the effects of reducing cost, batch production and the like while achieving the purpose of improving the net shape.

Description

technical field [0001] The invention belongs to the technical field of metallurgical machinery manufacturing, and in particular relates to a forging method for improving the network shape of a roll blank by using a radial forging machine. Background technique [0002] For a long time, the problem of excessive network carbides that has plagued major roll blank production plants has always existed, and has become the second most difficult problem after ultrasonic flaw detection. Overweight network carbides will be used as a Fatigue crack sources exist, and accidents such as spalling and roll holding may occur at any time during the use of the rolling mill, which will bring incalculable losses to the entire rolling mill production line. At present, it can be normalized twice, and the mesh level can be further reduced by adding another normalizing, but the method has a great impact on the cost and production cycle, and is rarely used in actual production. It is also possible to...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of high cost, long production cycle and limited forging precision of the existing method for improving the mesh shape, the present invention provides a forging method for improving the mesh shape of the roll billet by using a radial forging machine. The steps are as follows: after the billet is heated to a certain temperature, Carry out upsetting and elongation treatment in sequence, transfer the treated blank to the forging area of ​​the radial forging machine and ensure that the surface temperature of the blank is controlled at 900-920°C, and use the radial forging machine to carry out the roll body forging pass and the A-side roll neck forging in sequence Pass, B-side roll neck forging pass and finishing forging pass, air cooling for a certain period of time before the finishing forging pass to control the forging temperature at the lower limit of the final forging temperature of 850±10°C, and control the finishing according to the deformation rate of 87.3% The amount of reduction in the forging pass to forge the blank to the finished product

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