Method for making quench hardening layer of cold roll barrel

A technology of cold-rolled work rolls and manufacturing methods, which is applied in the field of heat treatment, and can solve problems such as subsurface overheating, insufficient heating depth, and insufficient relaxation of the transition layer, and achieve the effects of delaying roll wear and prolonging roll changing time

Active Publication Date: 2006-10-04
BAOSTEEL ROLL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] When the hardened layer is produced by duplex frequency induction quenching, an effective hardened layer of about 30mm can be obtained. The effective hardened layer refers to the hardened layer with a hardness greater than or equal to 90HSD, but it cannot completely compensate for the temperature loss of the roll surface, which is easy to cause The subsurface layer is overheated, causing the transition layer to be less relaxed, and the internal stress after quenching is relatively large
When the hardened layer is manufactured by power frequency and intermediate frequency dual-inductor quenching, there is the disadvantage of insufficient heating depth, and it is difficult to obtain an effective hardened layer of more than 30mm.

Method used

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  • Method for making quench hardening layer of cold roll barrel
  • Method for making quench hardening layer of cold roll barrel
  • Method for making quench hardening layer of cold roll barrel

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Experimental program
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Effect test

Embodiment 1

[0039] This embodiment adopts the cold-rolled work roll 5 roll blank obtained after smelting, electroslag remelting, roll blank forging, spheroidizing hydrogen expansion treatment, machining, quenching and tempering and other processes in the process of manufacturing cold-rolled work roll 5 It is a test roll, whose shape is shown in figure 1 , the length a of the roll body is 2030mm, the diameter b of the roll body is 520mm, and the end A is the lifting end of the roll during induction electric heating. The chemical composition of the materials used is shown in Table 1.

[0040] C

Si

mn

P

S

Cr

Ni

Mo

V

the rest is

Fe and

inevitable

Free of miscellaneous

quality

0.82

～0.90

0.30

～0.55

0.20

～0.50

≤

0.020

≤

0.015

4.90

～5.40

0.30

～0.50

0.20

～0.40

0.10 ...

Embodiment 2

[0044] All the other are identical with embodiment 1, and difference is: in the double-frequency three-inductor machine tool, the horizontal spacing of roll body and the first industrial frequency inductor 1 is 37mm, and the horizontal spacing of the second industrial frequency inductor 2 can be 48mm, and the horizontal distance between the intermediate frequency sensor 3 is 50mm; the vertical distance between the first power frequency sensor 1 and the second power frequency sensor 2 is 37mm, and the vertical distance between the second power frequency sensor 2 and the intermediate frequency sensor 3 is 37mm, the vertical distance between the intermediate frequency sensor 3 and the sprinkler 4 is 37mm; after adjusting the relative position between the roll and the three sensors and the sprinkler 4, make the roll rotate at a speed of 200rad / min on one side of the machine tool , while vertically descending at a speed of 0.9mm / s; when the lower edge of the roll body stretches into...

Embodiment 3

[0047]The rest are the same as in Embodiment 1, except that in the dual-frequency three-inductor machine tool, the horizontal distance between the roll body and the first power frequency sensor 1 is 62mm, and the horizontal distance between the roll body and the second power frequency sensor 2 is 75mm , The horizontal distance from the intermediate frequency sensor 3 is 75mm; the vertical distance between the first power frequency sensor 1 and the second power frequency sensor 2 is 65mm, and the vertical distance between the second power frequency sensor 2 and the intermediate frequency sensor 3 is 65mm 1. The vertical distance between the intermediate frequency inductor 3 and the sprinkler 4 is 65mm; after adjusting the relative position between the roll and the three inductors and the sprinkler 4, the roll is rotated at a speed of 360rad / min in the lathe. One side drops vertically at a speed of 1.5mm / s; when the lower edge of the roll body extends into the first power frequen...

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Abstract

The related processing method for quench-hardening layer of roller body comprises: processing roller with steel, letting roller body cross in turn the first and second LF sensors and MF sensor for induction electric heating, and spraying water for cool to obtain the target layer with depth more than 50mm. This invention can improve wear and yield, reduces energy consumption, and brings great economic benefits.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a method for manufacturing a quenched layer of a cold-rolled work roll body. Background technique [0002] The performance of the hardened layer on the body of cold-rolled work rolls, that is, its depth and hardness, has always been an important indicator for measuring the technical level of cold-rolled work rolls. [0003] Because the cold-rolled work rolls work under complex stress conditions such as bending, torsion, and extrusion. At this time, the surface of the part is subjected to much higher stress than the core, and the surface is constantly worn. Therefore, it must be The cold-rolled work roll body is manufactured with a hardened layer, so that the surface layer of the roll body has high strength, hardness, wear resistance and fatigue limit, and the body and body of the roll body should still maintain sufficient plasticity and toughness in order to withstand the impact load ....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/10
CPCY02P10/25
Inventor 唐广银葛浩彬李世辉
Owner BAOSTEEL ROLL SCI & TECH
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