A combined rolling mill roll and its manufacturing method

CN117483438BActive Publication Date: 2026-06-30SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
Filing Date
2023-11-14
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

The existing combined roll sleeves are difficult to form, have poor heat treatment effects, and have low reuse rates, resulting in poor processability and economic efficiency.

Method used

It adopts a combination structure of outer sleeve, intermediate sleeve and mandrel. The intermediate sleeve is assembled to the mandrel by key and fixed by bolt. The outer sleeve and intermediate sleeve are interference fit. The intermediate sleeve is made of forged steel with tensile strength ≥800Mpa. The interference ratio of the outer sleeve and intermediate sleeve is 0.6-1.0‰. The intermediate sleeve is designed as two semicircles with gap.

Benefits of technology

It reduces the difficulty of centrifugal casting production, ensures good solidification and cooling of the outer sleeve and inner hole, and achieves a hardness difference of ≤3HSD after heat treatment. The intermediate sleeve and mandrel can be reused more than 8 times, improving the processability and economy of the combined rolls.

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Abstract

This invention discloses a combined rolling mill roll and its manufacturing method, belonging to the field of rolling mill processing. The combined rolling mill roll comprises three parts: an outer sleeve, an intermediate sleeve, and a mandrel. The intermediate sleeve is assembled to the mandrel via a key, and the outer sleeve and intermediate sleeve are interference-fitted. The manufacturing method of the combined rolling mill roll includes the following steps: Step S1, Pre-fabrication of components: First, the intermediate sleeve and mandrel are prepared by forging, and the outer sleeve is produced by centrifugal casting; Step S2, Assembling the intermediate sleeve: Keyways are machined at the mating positions of the mandrel and the intermediate sleeve, and the two semicircles of the intermediate sleeve are assembled to the mandrel via keys; two bolt holes are machined at the mating positions on each side of the two semicircles, and the two semicircles are fixed with bolts; Step S3, Assembling the outer sleeve: After heating, the outer sleeve is assembled onto the intermediate sleeve. This invention solves the problems of high forming difficulty, poor heat treatment effect, and low reusability of conventional combined rolling mill roll sleeves, fully utilizing the processability and economic efficiency of combined rolling mill rolls.
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