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Surfacing repair method for large cold-rolled supporting roll

A back-up roll, large-scale technology, applied in manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems of high purchase cost, short service life, long manufacturing cycle of large-scale cold-rolled back-up rolls, etc. The effect of reducing production costs

Inactive Publication Date: 2011-08-17
TIANJIN METALLURGY GROUP HEAVY MACHINERY MFG
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Benefits of technology

This patented technology allows companies to reuse old equipment used during their manufacturing process without having them scraped down or being replaced with spare parts at an economic level. It also reduces costs compared to purchasing new ones instead of replacing it after use. Overall, these technical improvements help save money while still providing high quality products.

Problems solved by technology

This patented problem addressed in this patents relates to improving the durability and lifespan of heavyweight cold-roll backup rollers used for high volume continuous casting operations (HCS). Specifically, current methods involve replacing worn out parts with new ones after several years' usage due to factors like abrasion from repeated uses over time. However, these techniques have limitations that make them difficult to apply during maintenance periods without causing damage to the underlying equipment being casted.

Method used

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  • Surfacing repair method for large cold-rolled supporting roll
  • Surfacing repair method for large cold-rolled supporting roll

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Embodiment Construction

[0008] The surfacing welding repair method of the large-scale cold-rolling back-up roll of the present invention is described in conjunction with the accompanying drawings.

[0009] The surfacing welding repair method of large cold-rolled back-up roll of the present invention, this repair method comprises the following steps:

[0010] (1) Turning before welding

[0011] Remove the roll surface defects and fatigue layer of the back-up roll, and turn them to ensure the thickness of the surfacing layer. Partial defects on the roll surface are turned or partially ground with a grinder to ensure that all roll surface defects and fatigue layers are removed to make a spare roll Blank;

[0012] (2), non-destructive testing

[0013] Ultrasonic testing is carried out on the turned roll blank to check whether the fatigue layer is completely removed and whether there are internal crack defects in the roll body. If there are still defects, it is necessary to continue turning to eliminate...

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Abstract

The invention provides a surfacing repair method for a large cold-rolled supporting roll, comprising the following steps of: turning processing before welding; nondestructive flaw detection; preheating before welding; surfacing of a diluting layer; surfacing of a supporting layer; surfacing of a working layer; distressing heat treatment in the middle of welding; final heat treatment after welding; turning processing of a roll body; nondestructive flaw detection of a finished product; and coating and packaging of the finished product. The surfacing repair method has the effects that the large cold-rolled supporting roll normally scrapped can be repaired for reutilization, so that the production cost of a steel rolling enterprise is greatly reduced; the comprehensive performance and the service life of the repaired large cold-rolled supporting roll are superior to those of the bought integral forged steel large cold-rolled supporting roll; and the surfacing repair method is beneficial to achieving the purposes of repairing the old and utilizing the waste, improving the quality and reducing the consumption, saving the energy and reducing the emission and being green and environmentally-friendly.

Description

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Claims

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Application Information

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Owner TIANJIN METALLURGY GROUP HEAVY MACHINERY MFG
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