Special high-speed steel combination roll for cold-rolling high-strength automobile sheet and manufacturing method thereof

Abstract

The invention discloses a special cold-rolled high-intensity type high-speed steel combined roller for an automobile sheet and a manufacturing method thereof. The special cold-rolled high-intensity type high-speed steel combined roller for the automobile sheet comprises a high-speed steel roller body which is free from a center hole, and low-carbon steel roller sleeves which are mounted at two ends of the high-speed steel roller body in an interference fitting manner and are provided with center holes. The manufacturing method comprises the following steps: (1) manufacturing a roller body blank; processing a center hole; quenching; semi-fine grinding; and removing the center hole to obtain the high-speed steel roller body; (2) manufacturing roller sleeve blanks; processing the center holes; tempering; quenching the end surfaces of the roller sleeve blanks and the 60-degree tapered surfaces of the center holes by grades through a salt-bath furnace; and reconstructing the center holes toobtain the low-carbon steel roller sleeves; and (3) mounting the low-carbon steel roller sleeves to two ends of the high-speed steel roller body in the interference fitting manner, and fine grindingto obtain the finished product. With the adoption of the special cold-rolled high-intensity type high-speed steel combined roller for the automobile sheet and the manufacturing method thereof, the problem of micro cracks formed in a decarbonizing part of the center hole of an existing high-speed steel roller can be solved, so that the normal service life of the roller is prolonged, and the problemof remaining margin for the center hole is avoided, and as a result, the processing efficiency is improved, and the manufacturing and use cost is decreased.

Description

technical field [0001] The invention belongs to the technical field of high-speed steel rolls, and in particular relates to a special high-speed steel combination roll for cold-rolling high-strength automobile plates and a manufacturing method thereof. Background technique [0002] In response to increasingly stringent environmental challenges, the world's automotive industry has taken active actions to develop high-strength steel. High-strength steel usually refers to steel with a yield strength of more than 210MPa, and those with a yield strength of more than 550MPa are also called ultra-high-strength steel. High-strength steel and ultra-high-strength steel are modern automobile manufacturing materials that can not only ensure the lightweight of automobiles, but also improve the safety of automobiles. As the number of automobiles continues to grow, the demand for high-strength steel is also showing a significant upward trend. [0003] Compared with ordinary steel, high-st...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the existing problems in the prior art that the decarburized layer in the central hole of the high-speed steel roll is too thick and micro-cracks are easy to occur, and to provide a high-speed steel combined roll for cold-rolled high-strength automobile plates and its manufacturing method

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