Roll production method and roll produced by the method

Abstract

The invention relates to a production method of a roll, comprising: S1: setting a sheath with a gas port outside the mandrel, and loading alloy powder into the sheath when setting; S2: extracting gas from the gas port on the sheath to The alloy powder in the sheath is degassed; S3: seal the gas port to form a transition piece; S4: hot isostatically press the whole sheath containing the mandrel inside, so that the alloy powder is sintered to form a roller sleeve; S5 : Remove the sheath and perform machining to form a roll that meets the required size and surface quality. For the roll obtained by the roll production method of the present invention, the joint between the mandrel and the roll sleeve is a metallurgical joint interface, the joint is tight, no carbide is precipitated at the joint, and the content of non-metallic inclusions in the roll sleeve is low. There is no segregation in the structure of the roller sleeve, and the composition distribution is more uniform. At the same time, the surface hardness of the roller sleeve is uniform, and the surface quality of the product is greatly improved. Finally, the service life of the roll is greatly improved.

Description

technical field [0001] The invention relates to a roll production method and a roll produced by the method, belonging to the technical field of metallurgical machinery and equipment. Background technique [0002] The roll is an indispensable key component and the most important consumable spare part in the production of the metallurgical industry. The quality of the roll has an important impact on the production cost, processing efficiency and the quality of the rolled parts. For hot-rolled rolls, since they need to be in contact with hot-rolled steel at about 1200°C during work, the surface temperature of the rolls is very high, so the rolls need to maintain high hardness, high strength and good wear resistance at high temperatures. At present, a variety of materials for making rolls have been developed at home and abroad. Commonly used materials include alloy ductile iron, bainite ductile iron, high-chromium cast iron, high-vanadium cast iron, high-boron alloy, tool steel,...

AI Technical Summary

Problems solved by technology

[0009] Therefore, the technical problem to be solved by the present invention is to overcome the low bonding strength of the composite interface between the roll sleeve and the mandrel in the composite roll produced by the prior art, uneven structure and composition, easy generation of shrinkage cavities and looseness in the sleeve, and the failure of the roll sleeve. The composite junction with the mandrel is prone to carbide segregation and low service life, so as to provide a roller sleeve with high bonding strength, uniform structure and composition, and no shrinkage and porosity in the shaft sleeve. Method for long-life roll without segregation of carbides in composite joint with mandrel

[0010] In addition, the technical problem to be solved by the present invention is to overcome the low bonding strength of the composite interface between the sleeve and the mandrel in the composite roll in the prior art, uneven structure and composition, easy shrinkage and porosity in the sleeve, and problems between the sleeve and the mandrel. The composite junction of the mandrel is prone to segregation of carbides and low service life, so as to provide a production method with high bonding strength, uniform structure and composition, no shrinkage cavity and porosity in the shaft sleeve, roller sleeve and High-life roll with no carbide segregation at the composite joint of the mandrel

Images