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

Manufacturing method for scale breaking tension leveler working roll

A manufacturing method and technology of tension leveling machine, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of failure to meet the toughness requirements of the core, poor roll grinding performance, and brittle rolls, etc., and achieve the goal of reducing microcracks The effect of occurrence, improvement of wear resistance and reasonable stress distribution

Active Publication Date: 2014-02-19
宜兴市鑫源辊业有限公司
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the conventional manufacturing method "rough turning - quenching and tempering - semi-finishing turning - shaping treatment - rough grinding roll surface - intermediate frequency quenching (water spray cooling) - low temperature tempering - finishing to finished product" to produce the work roll of the scale breaking and straightening machine, but Since Cr12MoVCo high-carbon high-chromium die steel is hard and brittle, and has excellent hardenability, it is only suitable for use in the case of overall hardening. There are three problems in the above quenching process of Cr12MoVCo: 1. Quenching water cooling will produce a large number of microcracks , so that the roll is brittle; 2. Quenching water cooling will produce a large quenching deformation, which is easy to cause straightening fracture; 3. The grinding performance of the low-temperature tempered roll is extremely poor, and it is very easy to cause grinding cracks
Although the work rolls of the scale breaking and leveling machine produced by integral quenching can meet the requirements of high surface hardness and wear resistance, they cannot meet the toughness requirements of the core, and there is a risk of roll breakage during use

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
  • Manufacturing method for scale breaking tension leveler working roll

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A working roll of a scale breaking and leveling machine, using Cr12MoVCo die steel as the material, the alloy components and weight percentages of Cr12MoVCo die steel are C: 1.40%, Si: 0.60%, Mn: 0.60%, P: 0.025%, S: 0.025%, Cr: 11.00%, Mo: 1.00%, V: 0.70%, Co: 0.30%, and the rest are Fe and unavoidable impurities.

[0017] The manufacturing method includes the following: rough turning—tempering—semi-finishing turning—setting treatment—rough grinding roller surface—preheating—intermediate frequency spray quenching—isothermal treatment—tempering—finishing to finished product; among them, the quenching and tempering process is: 650°C Preheating → 950°C well furnace heating for 50 minutes, oil quenching → 700°C high temperature tempering; preheating temperature is 400°C; intermediate frequency spray quenching is carried out at 1150°C, the workpiece is cooled to 250°C and sent to an oven for isothermal treatment at 250°C 3 hours; tempering at 500°C for 8 hours.

Embodiment 2

[0019] A working roll of a scale breaking and leveling machine, using Cr12MoVCo die steel as the material, the alloy components and weight percentages of Cr12MoVCo die steel are C: 1.48%, Si: 0.56%, Mn: 0.48%, P: 0.020%, S: 0.017%, Cr: 13.00%, Mo: 0.85%, V: 0.78%, Co: 0.43%, and the rest are Fe and unavoidable impurities.

[0020] The manufacturing method includes the following: rough turning - quenching and tempering - semi-finishing turning - shaping treatment - rough grinding roller surface - preheating - intermediate frequency spray quenching - isothermal treatment - tempering - finishing to finished product; wherein, the quenching and tempering process is: 600 ° C Preheating→heating at 950°C for 65 minutes and then oil quenching→730°C high temperature tempering; preheating temperature is 400°C; intermediate frequency spray quenching is carried out at 1150°C, after quenching, the workpiece is cooled to 200°C and sent to an oven for isothermal at 250°C Treat for 3 hours; te...

Embodiment 3

[0022] A working roll of a scale breaking and leveling machine, using Cr12MoVCo die steel as the material, the alloy components and weight percentages of Cr12MoVCo die steel are C: 1.60%, Si: 0.60%, Mn: 0.58%, P: 0.020%, S: 0.015%, Cr: 11.75%, Mo: 0.80%, V: 1.00%, Co: 0.50%, and the rest are Fe and unavoidable impurities.

[0023] The manufacturing method includes the following: rough turning—tempering—semi-finishing turning—setting treatment—rough grinding of roll surface—preheating—medium frequency spray quenching—isothermal treatment—tempering—finishing to finished product; among them, the quenching and tempering process is: 620°C Preheating→heating at 950°C for 70 minutes and then oil quenching→710°C high temperature tempering; preheating temperature is 400°C; intermediate frequency spray quenching is carried out at 1160°C, after quenching, the workpiece is cooled to 250°C and sent to an oven for isothermal at 250°C Treat for 3 hours; temper at 510°C for 9 hours.

[0024]...

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 discloses a manufacturing method for a scale breaking tension leveler working roll. By adopting Cr12MoVCo die steel as the material, the manufacturing method includes the steps of: rough turning, hardening and tempering, semi-finish turning, shaping treatment, coarse grinding of roll surface, preheating, medium frequency spray quenching, isothermal treatment, tempering, and finish machining, thus obtaining a finished product. Specifically, the preheating temperature is 400-450DEG C, the medium frequency spray quenching temperature is 1100-1200DEG C, the isothermal temperature is 200-250DEG C, and the tempering temperature is 500-550DEG C. In the invention, by changing the thermal treatment process, under the circumstance of obtaining quenched martensite on the surface, a transition layer is mainly based on bainite, high hardness and high wear resistance of the surface are retained, toughness of the transition layer and the core is increased, the occurrence of microcracking is reduced, and the fracture risk in use is avoided. The thickness of the transition layer is increased, the overall strength of the roll is increased, the stress distribution is more reasonable, and the grinding performance of the roll is improved.

Description

technical field [0001] The invention relates to work rolls, in particular to a method for manufacturing work rolls of a scale breaking and leveling machine. Background technique [0002] There is scale on the surface of the hot-rolled steel strip. In order to ensure the quality of the subsequent pickling process and improve the efficiency of pickling, the surface of the strip steel is often mechanically descaled before entering the pickling tank. , so that the oxide film on the surface of the strip falls off or breaks. The work rolls of the pickling line scale breaking and leveling machine are subjected to heavy force and serious wear during operation. Not only the surface is required to have high hardness and wear resistance, but also the core is required to have good toughness, otherwise there will be a risk of roll breakage. At present, the working rolls of the pickling line scale breaking and leveling machines commonly used in major steel mills are made of GCr15 materia...

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): C21D9/38C22C38/30
Inventor 冯文峰
Owner 宜兴市鑫源辊业有限公司
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