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Overlaying welding repairing technology of stainless steel cold-rolled bearing roller

A back-up roll and stainless steel technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problem of high manufacturing cost of rolls

Inactive Publication Date: 2012-12-26
ZHANGJIAGANG KAINA INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the manufacturing cost of the roll is high, and the surfacing welding repair manufacturing technology of the cold rolling back-up roll is an effective method to reduce the cost and improve the performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Overlay welding repair of back-up rolls of Zhangjiagang Pohang Stainless Steel Cold Rolling Unit No. 1

[0030] 1. The YJ243-S welding wire developed and produced by the Welding Research Institute of the Construction Research Institute of China Metallurgical Group was selected as the working layer of the cold-rolled backup roll, the YJ012-S welding wire was used as the transition layer, and the SJ600 sintered flux was selected as the surfacing flux.

[0031] 2. Process to remove the old fatigue layer and cracks of the cold rolling back-up rolls to be repaired.

[0032] 3. Carry out ultrasonic and penetrant inspection on the roll neck. If serious defects are found (especially in the transition area between the roll body and the roll neck), the roll is not suitable for subsequent processes.

[0033] 4. Completely remove the fatigue layer on the roller surface, and turn it until the thickness of the surfacing layer is 12mm.

[0034] 5. Turning is deep, and the b...

Embodiment 2

[0039] Example 2 Overlay welding repair of back-up rolls of Zhangjiagang Pohang Stainless Steel Cold Rolling Unit No. 3

[0040] 1. The YJ243-S welding wire developed and produced by the Welding Research Institute of the Construction Research Institute of China Metallurgical Group was selected as the working layer of the cold-rolled backup roll, the YJ012-S welding wire was used as the transition layer, and the SJ600 sintered flux was selected as the surfacing flux.

[0041] 2. Process to remove the old fatigue layer and cracks of the cold rolling back-up rolls to be repaired.

[0042] 3. Carry out ultrasonic and penetrant inspection on the roll neck. If serious defects are found (especially in the transition area between the roll body and the roll neck), the roll is not suitable for subsequent processes.

[0043] 4. Completely remove the fatigue layer on the roller surface, and turn it until the thickness of the surfacing layer is 15mm.

[0044] 5. Turning is deep, and the b...

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Abstract

The invention relates to an overlaying welding repairing technology of a stainless steel cold-rolled bearing roller, and the technology belongs to the field of metal processing. According to the use conditions of a narrow-band stainless steel cold-rolled bearing roller, a YJ012-S overlaying welding transition layer and a YJ243-S flux-cored wire are selected as overlaying welding working layers to carry out overlaying welding repairing to the cold-rolled bearing roller together with an automatic submerged arc overlaying welding process of preheating before welding and tempering heat treatment after welding. According to the cold-rolled bearing roller after subjected to overlaying welding repairing, the toughness and the wear resistance are better than those of original 9Cr2Mo roller surface metal. The repaired cold-rolled bearing roller is operated and assessed on an actual production line. Compared with an original roller, the service life is doubled and the use requirements on the cold-rolled bearing roller are met. A main process comprises processing and detection before welding, ,preheating, overlaying welding and destressing and tempering after welding.

Description

technical field [0001] The invention relates to a surfacing welding repair technology for stainless steel cold-rolled backup rolls, which belongs to the field of metal processing. Background technique [0002] Cold rolls are working parts that shape metals by extrusion in a cold state. Due to its harsh working conditions and extremely high working stress, the surface often fails in the form of peeling, falling off, and abrasion during the working process. Therefore, the surface is required to have relatively high hardness, wear resistance and crack resistance. During the rolling process, the rolls are scrapped due to large-scale peeling off of the rolls. The depth of the hardened layer of the work roll is 8-12mm, the depth of the hardened layer of the backup roll is about 20mm, and the depth of the spalling is generally 15mm, and the crack extends to 30mm. If the roll shows extensive spalling, it will rarely be reworked for further use. [0003] At present, most of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/04B23K9/235
Inventor 庞兵
Owner ZHANGJIAGANG KAINA INFORMATION TECH
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