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Preparation process of composite roller

A preparation process and composite roll technology, which is applied in the field of roll production, can solve problems such as uneven structure, reduce roll production cost, inclusions, etc., and achieve the effect of improving interface bonding strength and improving alloy segregation

Active Publication Date: 2018-06-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method significantly improves the problems of high-alloy segregation, inclusions, looseness in the middle, and uneven structure of the roll, and greatly reduces the production cost of the roll.

Method used

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  • Preparation process of composite roller
  • Preparation process of composite roller
  • Preparation process of composite roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this embodiment, a composite roll with a composite three-layer ring is to be manufactured, wherein the material of the first layer of the ring is 5Cr 5 MoV, the material of the second roller ring is 9Cr 2 , the third layer material is 8Cr 3 MoV, roller core material is 42CrMo steel. Its longitudinal and transverse cross-sectional structures are as figure 1 shown. The specific preparation process is as follows: first, the roller core and the three-layer roller ring are welded and sealed from the inside to the outside by the vacuum electron beam welding method, and the vacuum degree is 9.4×10 -3 Pa; heat the sealed roll ring and roll core to 1180±10°C, and keep it warm for 6h; start forging, and then carry out the pier thickening and elongation process in turn to realize the interface metallurgical bonding of the roll core and roll ring. The total forging ratio of pier thickening is 1.8, using the upper and lower V anvils to elongate the pier-thickened roll blank a...

Embodiment 2

[0021] In this embodiment, a compound roll with a composite layer of roll ring will be manufactured, wherein the material of the roll ring is 5Cr 5 MoV, roller core material is 42CrMo. Its longitudinal and transverse cross-sectional structures are as figure 2 shown. The specific preparation process is as follows: use the manual arc welding method to first weld and seal the roller core and the roller ring, and then vacuumize, the vacuum degree is ≤8.6×10 -3 Pa; heat the sealed roll ring and roll core to 1170±10°C, and keep it warm for 4 hours; start forging, and carry out the pier thickening and elongation process in turn to realize the interface metallurgical bonding of the roll core and roll ring, wherein the total forging ratio of pier thickening is ≥ 1.5, using the upper and lower circular arc anvils to elongate the pier-thickened roll blank and roll core, the total forging ratio of elongation is 2.4; and then the composite roll is obtained through subsequent heat treatm...

Embodiment 3

[0024] In this embodiment, a composite roll with a composite two-layer roll ring is to be manufactured, wherein the first layer of roll ring material is 5Cr 5 MoV, the material of the second roller ring is 9Cr 2 , Roller core material is 45 steel. Its longitudinal section structure is as image 3 shown. The specific preparation process is as follows: first, the roller core and the second layer of roller ring are welded and sealed from the inside to the outside by the vacuum friction stir welding method, and the vacuum degree is ≤7.8×10 -3 Pa; heat the sealed roll ring and roll core to 1170±10°C, and keep it warm for 5h; start forging, and then carry out the pier thickening and elongation process in turn to realize the interface metallurgical bonding of the roll core and roll ring. The total forging ratio of pier thickening is 1.6, using the upper and lower V anvils to elongate the pier-thickened roll blank and roll core, the total forging ratio of elongation is 2.6; and the...

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Abstract

The invention provides a preparation process of a composite roller. The preparation process includes the following steps that a roller core and a single layer or multiple layers of roller rings are subjected to welded seal from inside to outside under a vacuum condition; the sealed roller rings and roller core are heated to 1,050-1,250 DEG C, and heat preservation is carried out for 1-8 h; forgingis started, heading and drawing procedures are sequentially carried out, and interfacial metallurgical bonding of the roller core and the roller rings is achieved; and the composite roller is obtained through following thermal treatment and machining and grinding processes. Due to the fact that the roller rings and the roller core are subjected to welded seal in the high-vacuum environment, the sealed roller rings and roller core are subjected to heading and drawing, the roller rings and the roller core are firmly bonded, and the problems that a forged composite roller suffers from alloy segregation, central inclusion, structure unevenness and the like are greatly relieved.

Description

technical field [0001] The invention relates to the technical field of roll production, in particular to a preparation process of a composite roll. Background technique [0002] As the main consumption part of the rolling mill, the roll consumption cost is about 5-10% of the rolling cost. The quality of the roll is not only related to the production cost of rolling steel and the production rate of the rolling mill, but also affects the quality of the rolled material to a large extent. In order to meet the long-term work of the roll in harsh environments such as high temperature, high wear resistance, strong load, and radioactivity, the roll core and roll neck of the ideal roll have high toughness, and the working layer has high wear resistance. However, a single material cannot meet the requirements of high wear resistance and high toughness at the same time. Due to the different materials of the working layer and the roll core, the compound roll can ensure the excellent per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 骆宗安谢广明李明冯莹莹余焕王明坤
Owner NORTHEASTERN UNIV
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