Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Heating method during quenching of large supporting roller

A heating method and backup roll technology, applied in the direction of heat treatment furnace, furnace type, heat treatment equipment, etc., can solve problems such as difficulties

Inactive Publication Date: 2015-07-15
BAOSHAN IRON & STEEL CO LTD
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, whether it is differential temperature heating or induction heating, it is still quite difficult to achieve uniform heating with a depth of more than 80mm in a short period of time.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Heating method during quenching of large supporting roller
  • Heating method during quenching of large supporting roller
  • Heating method during quenching of large supporting roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A heating method during quenching of a large backup roll, which includes the following stages:

[0036] (I) Low-temperature isothermal heating: carried out in a resistance furnace, and kept at a constant temperature of 450°C for 30h;

[0037] (II) Non-penetrating heating at medium temperature: Carry out in a resistance furnace to raise the surface temperature of the roll body to 750°C and keep it at a constant temperature for 2 hours. It is necessary to take heat insulation or even local cooling measures for the roll shafts at both ends of the roll;

[0038] (III) High-temperature induction heating: Carry out in a high-temperature induction heating furnace to raise the surface temperature of the roll body to 950°C and keep it at a constant temperature for 2 hours.

[0039] After the heating is completed, the subsequent cooling and quenching of the roll can be carried out in the spray quenching equipment as soon as possible.

[0040] see image 3 .

[0041] Stage (III...

Embodiment 2

[0043] A heating method during quenching of a large backup roll, which includes the following stages:

[0044] (I) Low-temperature isothermal heating: carried out in a resistance furnace, and kept at a constant temperature of 350°C for 24h;

[0045] (II) Non-penetrating heating at medium temperature: carried out in a differential temperature furnace to raise the surface temperature of the roll body to 800°C and keep it at a constant temperature for 3 hours, without heat insulation protection for the roll shaft;

[0046] (III) High-temperature induction heating: Carry out in a high-temperature induction heating furnace to raise the surface temperature of the roll body to 950°C and keep it at a constant temperature for 1 hour.

[0047] see Figure 4 .

[0048] Stage (III) The final heating depth is increased to 125mm, and the temperature difference between inside and outside is reduced to ≤75°C.

Embodiment 3

[0050] Heating is carried out according to the method described in Example 2, and the high temperature induction heating described in stage (III) in Example 2 is replaced with the following steps:

[0051] (1) In the high-temperature induction heating furnace, the roller surface is heated to 980°C and kept for 10 minutes, then cooled to 930°C, △T1=50°C;

[0052] (2) Heating to raise the surface temperature of the roll body to 980°C for 10 minutes, then cooling to 940°C, △T2=40°C;

[0053] (3) Heating to raise the surface temperature of the roll body to 980°C for 10 minutes, then cooling to 950°C, △T3=30°C;

[0054] (4) Heating to raise the surface temperature of the roll body to 980°C for 10 minutes, then cooling to 960°C, △T4=20°C;

[0055] (5) Heating to raise the surface temperature of the roll body to 980°C for 10 minutes, then cooling to 970°C, △T5=10°C;

[0056] (6) Heating to raise the surface temperature of the roll body to 980°C for 10 minutes.

[0057] see Figur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a heating method during quenching of a large supporting roller, wherein the heating method comprises three stages of (I) low-temperature isothermal heating, (II) middle-temperature non-penetration heating and (III) high-temperature induction heating; in the stage (III), a high-temperature induction heating process of 'heating-cooling-heating' dynamic heat preservation also can be adopted, and thus the heating quality and the quenching quality of the supporting roller are improved. The heating method has the advantages of high heating depth, uniform heating temperature, microstructure refinement and the like, is suitable for deep quenching heat treatment of large rollers, shafts, rods and other workpieces, and has broad popularization and application prospects.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, and relates to a quenching heat treatment method for large-diameter rollers / shafts / rods, in particular to a heating method for quenching large-scale support rollers. Background technique [0002] The roll is the main tool for steel rolling production. The roll surface is generally quenched and hardened to improve the wear resistance of the roll surface, prolong the service life of the roll, and improve the rolling quality of the steel plate surface. For large backup rolls, it is of great significance to be able to achieve deep quenching. At present, the main methods to increase the depth of the hardened layer of the roll are: (1) alloying method, that is, by adding alloy elements such as Cr, Mo, Mn, etc., to increase the hardenability of the roll material itself to increase the depth of the hardened layer; (2) Intense cooling, through measures such as improving the quenching medium ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/06C21D9/38
Inventor 温宏权吴存有王建刚孙大乐
Owner BAOSHAN IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com