High-speed steel roller manufacturing method

Abstract

The invention discloses a high-speed steel roller manufacturing method which is suitable for small steel rolling machines and bar mills. The manufacturing method comprises the three process steps of raw material smelting, casting moulding, machining and heat treatment. On the basis that high-speed molten iron is centrifugally poured, firstly, transition layer molten iron is poured, and then the complete replacement of the transition layer molten iron is achieved by pouring core part molten iron. According to the high-speed steel roller manufacturing method, the combination strength of outer layer high-speed steel and the core part molten iron is obviously increased and increased to 500 Mpa or higher from around 350 Mpa in the past, and thus the anti-stripping performance of the combination layer of a roller body of a high-speed steel roller is greatly improved. Meanwhile, the amount of carbide forming elements generated by corrosion to the outer layer by the core part molten iron can be effectively reduced, so that the texture of a roller neck is improved, the tensile strength of the roller neck is increased, and the phenomenon of roller breakage in the using process is effectively eradicated.

Description

technical field [0001] The invention relates to a manufacturing method of rolls, in particular to a manufacturing method of high-speed steel rolls suitable for small steel mills and wire and bar mills. Background technique [0002] The roll is an important part of the rolling mill in the rolling mill and an important consumable part that determines the efficiency of the rolling mill and the quality of the rolled product. The rolls use the pressure generated by a pair or a group of rolls to roll the rolled piece, so that the rolled piece produces plastic deformation and obtains an ideal design shape. Therefore, the quality of the roll is directly related to the surface quality of the rolled product and the rolled steel. machine productivity. It is mainly subjected to dynamic and static loads, wear and temperature changes during rolling. [0003] The use of high-speed steel to make rolls began in the 1980s. The application of high-speed steel rolls is an important part of t...

AI Technical Summary

Problems solved by technology

During composite casting, the high-speed steel working layer located on the outer layer of the roll contains a large amount of carbide-forming elements such as V, W, and Cr, while the core of the roll is ductile iron. There will be a large number of carbides in the position, which makes the strength of the bonding layer very low, causing the roll to easily peel off from the bonding layer during use; Entering the core of the roll, the carbides in the core of the roll will increase, which will eventually lead to a decrease in the strength of the journal of the roll, and prone to roll breakage during use

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