Method for repairing cold roll

A technology of cold-rolled work rolls and repair methods, applied in the direction of keeping roll equipment in an effective state, metal rolling, manufacturing tools, etc., can solve problems affecting the quality of stainless steel products, low efficiency, etc., and achieve significant economic and social benefits. The effect of reducing production costs and reducing repair costs

Inactive Publication Date: 2003-02-05
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the efficiency is low, and it is easy to produce cr...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment one: present embodiment repairs the cold-rolled work roll of Sendzimir twenty-roll mill, and it is made up of following steps:

[0010] (1) The size of the work roll before repair was measured to be Φ62.8mm, and the coloring flaw detection found that there were 3 cracks on the roll body. After inspection by the RMG4015 crack depth flaw detector, the depth of the 3 cracks were 0.15mm, 0.20mm, and 0.25mm respectively. After calculation This work roll has repair value.

[0011] (2) Turning of cold-rolled work rolls:

[0012] On the 620 lathe, a three-jaw chuck is used, and the top of the cold-rolled work roll is clamped. During the cutting process, a tool holder is used. The cutting tool uses a machine-clamped indexable PCBNΦ12.7 garden blade. The cutting parameters are:

[0013] A. Rough turning: cutting depth t=0.2mm, feed speed 0.25mm / r, machine speed 160r / min;

[0014] B: Finish turning: cutting depth t=0.1mm, feed speed 0.15mm / r, machine speed 160r / min; ...

Embodiment 2

[0024] Embodiment 2: This embodiment is to repair the cold-rolled work roll of the Sendzimir 20-high mill. The size of the work roll before repair is measured to be Φ62.5mm. The coloring flaw detection finds that there is one crack on the roll body, and the RMG4015 crack depth flaw detector Check that the crack depth is 0.8mm, and the theoretical value of the roll body diameter after repair is 62.5-1.6=60.9mm<61.5mm, which is regarded as having no repair value and scrapped directly.

Embodiment 3

[0025] Embodiment three: present embodiment repairs the cold-rolled work roll of Sendzimir twenty-roll mill, and it is made up of following steps:

[0026] (1) The size of the work roll before repair was measured to be Φ63mm, and the coloring flaw detection found that there were 2 cracks on the roll body. After inspection by the RMG4015 crack depth flaw detector, the depth of the 2 cracks were 0.2mm and 0.3mm respectively. After calculation, the work roll has been repaired value.

[0027] (2) Turning the work roll:

[0028] On the 620 lathe, a three-jaw chuck is used, and the top of the cold-rolled work roll is clamped. During the cutting process, a tool holder is used. The cutting tool uses a machine-clamped indexable PCBNΦ12.7 garden blade. The cutting parameters are:

[0029] A. Rough turning: cutting depth t=0.25mm, feed speed 0.25mm / r, machine speed 160r / min;

[0030] B: Finish turning: cutting depth t=0.1mm, feed speed 0.15mm / r, machine speed 160r / min;

[0031] After ...

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PUM

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Abstract

The method for repairing working roll for cold-rolling includes the following steps: using the combination of dye penetrant inspection and crack depth detector to define crack position and crack depth; turning working roll for cold-rolling, after it is turned, using dye penetrant inspection method to make inspection, checking and confirming that said working roll has no crack and transferring it into next procedure, if said working roll also has the crack, making secondary turning, low-temp. tempering treatment of crackless roll, further grinding so as to make it reach to requirements for use.

Description

technical field [0001] The invention relates to a method for repairing cold-rolled work rolls with cracks on the surface but less than the scrapped size. Background technique [0002] In the production process of stainless steel, cracks will appear on the surface of the cold-rolled work roll after a period of use, which will directly affect the product quality of stainless steel. For example, the diameter of the finished work roll of the 20-roll mill is Φ63.5mm. When the diameter wears to Φ58mm~Φ59mm during production, the cold-rolled work roll is scrapped, and a considerable part of the cold-rolled work roll is less than the scrapped size, and the surface of the roll body is damaged. Cracks have appeared, affecting the quality of stainless steel. Therefore, in order to ensure product quality in production, the cold-rolled work rolls that have not been used to the scrapped size and have cracks on the surface of the roll body can only be scrapped in advance. This will not o...

Claims

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Application Information

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IPC IPC(8): B21B28/02
Inventor 赵俏云
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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