Production Method for Eliminating Cracks in Backing Roll Neck

Abstract

The invention relates to a production method for eliminating cracks on a roll neck of a supporting roll. The production method comprises the process steps of wholly casting a steel ingot in a bottom injection manner or in a top injection manner, forging the steel ingot, normalizing and annealing, machining, quenching or performing temperature difference heat treatment, tempering treatment and the like, wherein the forging of the steel ingot comprises the pressing process, and the pressing process is that by adoption of a forging flat anvil, a steel ingot shoulder and a steel ingot riser on an ingot body of the steel ingot on the inner side of a parting surface are forged into a clamp handle of which the diameter is matched with a clamping inner hole of an upsetting leakage plate according to a certain feeding length D. According to the production method, the transverse cracks occurring in the riser end after the steel ingot is upset and lengthened can be effectively eliminated, the production quality of the supporting roll is improved, and the generation of waste products is prevented.

Description

technical field [0001] The invention relates to the field of backup roll manufacture, in particular to a production method of the backup roll. Background technique [0002] The production method of the backup roll mainly includes the following steps: the first step is to refine the steel ingot, the second step is to heat and forge the steel ingot to form a roll billet shape, the ends are cut and the tail is removed, the third step is normalizing annealing and mechanical processing, the fourth step is quenching and tempering and Differential temperature heat treatment, the fifth step is tempering treatment. [0003] In the step of forging the steel ingot, the existing forging process usually presses the riser from the parting surface of the steel ingot into a gripper that matches the inner hole of the upsetting drain plate, which is used to clamp the steel ingot and perform upsetting and forging of the steel ingot. Use, and finally remove the ingot riser. The parting surfac...

AI Technical Summary

Problems solved by technology

The parting surface of the steel ingot is the junction of the ingot body and the riser. Due to the poor metallurgical quality at the parting surface of the ingot, the normal strength value of the material at this part is reduced. Therefore, the ingot is pressed according to the traditional method, and then the ingot is upset and elongated. When the large deformation operation is performed, the stress at the end of the steel ingot will exceed its tensile strength, resulting in transverse cracks, and the steel ingot with cracks will eventually be formed into a part of the neck of the back-up roll. During the subsequent forging process, the cracks along the ring Expansion, eventually easy to form large transverse cracks, thus affecting the surface quality of the back-up roll neck

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