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Cold-bending roller welding repair method

A technology for welding repair and roll, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of high repair cost, difficult to achieve the original performance of cold-formed damaged roll, and achieve the effect of reducing expenses

Active Publication Date: 2012-05-09
SHANXI DINGRONG COLD FORMED SECTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the current cold-bending damaged roll is difficult to achieve the original performance and the repair cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: This embodiment is aimed at the sixth upper roll of the cold-formed steel sheet pile unit. After stress cracks appear on the edge of the roll during the rolling process, in order to avoid the deepening of cracks, affect production, and save costs, the repair method of the present invention is used. It's repaired. The specific repair steps are as follows:

[0014] 1. Conduct crack depth and length flaw detection on cracked and damaged parts: wipe the surface of the roll clean to remove oil and impurities. This example is a longitudinal and horizontal crack on the roll. Use HANWEI HS606 ultrasonic detector to measure the depth of the crack as 30mm. The length of the crack is 300mm; plan the crack with a carbon arc planer gun to open a 60° single V-shaped groove to ensure the smoothness of the welding rod, plan until the depth reaches the part without cracks, use an angle grinder to grind or file to make the surface of the part to be welded clean and smo...

Embodiment 2

[0020] Example 2: This example is for the tenth upper roll of the cold-formed steel sheet pile unit. During the rolling process, it is found that the brittle and hard layer is crushed and peeled off at the edge. The diameter of the roll is 300mm, the thickness is 50mm, the material is GCr15 and it Surface strengthening treatment, in order to prevent the exfoliation surface from enlarging, repair this roller with the repairing method of the present invention. The specific repair steps are as follows:

[0021] 1. Wipe the surface of the roll clean to remove oil and impurities. In this case, the surface layer of the roll is damaged. Use an electric grinding wheel to polish the shedding area until it reaches the base metal. The grinding thickness is 2-3mm, and the grinding range is based on the shedding range. Then expand it by 5mm.

[0022] 2. Carry out heating and preheating treatment on the roll: choose oxygen-acetylene flame to heat the whole welding roll to 100-150°C.

[00...

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Abstract

The invention relates to a cold-bending roller welding repair method, which includes the steps: firstly, performing crack depth and length flaw detection for cracking and damaged positions; secondly, grinding and back chipping the cracking and damaged positions of surfaces of rollers; thirdly, warming and preheating the rollers; fourthly, performing repair welding by means of overlaying process; fifthly, performing post-welding heat treatment; sixthly, performing machining according to requirements of drawings; and seventhly, performing nondestructive testing and hardness testing. The service life of a repaired roller is the same as that of a newly made roller, the surface hardness of the repaired roller reaches HRC (Rockwell hardness) 56-60, and the expense of an end user for using the rollers is reduced.

Description

technical field [0001] The invention relates to a roll repair method, in particular to a cold-bending roll welding repair method. Background technique [0002] During the use of cold-bending or welded pipe rolls, due to large changes in local strength, the rolls will be damaged, such as wear, collapse, cracks on the roll surface, roll breakage, and uneven hardness of the rolls, which will cause the rolls to be scrapped. Because cold-bending or welded pipe rolls are made of GCr15 or 12Cr1MoV materials, the price is relatively high, and there is no repair method that can make the damaged roll achieve the original performance. Therefore, how to repair the roll and extend the service life of the roll has become the key to reducing production costs. [0003] Patent No. 200810306385.9 discloses a method for repairing surface defects of hot-rolled backup rolls, which only repairs surface defects of hot-rolled backup rolls and does not involve cold-bending rolls. 201010262304.7 dis...

Claims

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Application Information

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IPC IPC(8): B23P6/04B23K9/04
Inventor 于立兴
Owner SHANXI DINGRONG COLD FORMED SECTIONS
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