A forging method for improving the mesh shape of roll blank by using radial forging machine

Abstract

The invention relates to a forging method for improving the mesh level of a roll billet by using a radial forging machine, and belongs to the technical field of metallurgical machinery manufacturing. In order to solve the problems of high cost, long production cycle and limited forging precision in the existing method for improving the mesh shape, the present invention provides a forging method for improving the mesh level of the roll billet by using a radial forging machine, which includes: heating the billet to a certain temperature and then upsetting Thickening and elongation, heat the obtained billet to the forging area of ​​the radial forging machine and ensure that the surface temperature of the billet is controlled at 900-920°C, use the radial forging machine to carry out the forging pass of the roll body, the forging pass of the roll neck of the A side, and the forging pass of the B side Roll neck forging pass and finishing forging pass, air cooling for a certain period of time before finishing to control the forging temperature at the lower limit of the final forging temperature of 850±10°C, and control the reduction of the finishing forging pass according to the deformation rate of 87.3%. The billet is forged to the finished product. Applying it to the manufacture and production of roll blanks can not only achieve the purpose of improving the net shape, but also achieve the effects of reducing costs and enabling mass production.

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...

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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 pressure of the finishing forging pass Forging the billet to the finished product

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