CN102837116A - Overlaying welding repairing technology of stainless steel cold-rolled bearing roller - Google Patents
Overlaying welding repairing technology of stainless steel cold-rolled bearing roller Download PDFInfo
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- CN102837116A CN102837116A CN 201110170628 CN201110170628A CN102837116A CN 102837116 A CN102837116 A CN 102837116A CN 201110170628 CN201110170628 CN 201110170628 CN 201110170628 A CN201110170628 A CN 201110170628A CN 102837116 A CN102837116 A CN 102837116A
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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
The present invention relates to a kind of stainless-steel cold-rolling backing roll technology for repairing surfacing, belong to the metal manufacture field.
Background technology
Cold roll is under cold conditions, to pass through the workpiece of the mode of extruding with metal machine-shaping.Because its condition of work is abominable, working stress is very big, and the surface is normal in the course of the work produces the inefficacy of peeling off, fall forms such as piece, wearing and tearing, so requires its surface to possess quite high hardness, wearability and crack resistance.In the operation of rolling, peel off because of the roll large tracts of land and to cause roll to scrap.The working roll depth of hardening zone is 8～12mm, and the backing roll depth of hardening zone is about 20mm, generally reaches 15mm and peel off the degree of depth, and crack growth is to 30mm.Peel off if large tracts of land appears in roll, then seldom can continue to use through reprocessing.
At present, cold-rolling support roll both domestic and external adopts higher the forging and modified such as material monolithics such as 9Cr2Mo, 86CrMoV7 of carbon and alloying element content mostly, improves hardness and wearability through heat treatment means such as surface hardenings then.Therefore, the roll manufacturing cost is high, and the built-up welding of cold-rolling support roll reparation manufacturing technology is to reduce cost, and improves the effective ways of performance.
Summary of the invention
According to arrowband stainless-steel cold-rolling backing roll applying working condition, selected YJ012-S built-up welding transition zone and YJ243-S flux-cored wire as the built-up welding working lining and be aided with weld preheating and the automatic submerged-arc bead-welding technology of postwelding tempering heat treatment carries out the built-up welding reparation to cold-rolling support roll.Cold-rolling support roll after built-up welding is repaired, its obdurability and wearability are superior to former 9Cr2Mo roll surface metal.Cold-rolling support roll after the reparation carries out post-installation review on the actual production line, former relatively roller, and the life-span has been improved 1 times, has satisfied the instructions for use of cold-rolling support roll.
According to the condition of work and the failure mode of cold-rolling support roll, cold-rolling support roll is carried out the built-up welding reparation, have following 2 requirements usually:
(1) the built-up welding working lining has enough intensity and toughness to bear high draught pressure and impulsive force, to improve backing roll crack and the ability of peeling off.
(2) the finished product cold-rolling support roll body of roll (overlay cladding) must have height and uniform hardness and good wearability, guarantees the dimensional accuracy and the favorable surface quality of cold-strip with this.
The selection of 1 resurfacing welding material
To the rolling characteristic requirements of four-high mill cold-rolling support roll with and failure mode; And combine the concrete specification requirement of arrowband stainless-steel cold-rolling backing roll, the present invention select for use the Cr-Ni-Mo-V (or Cr-Ni-Mo-W-V) of Heat stability is good low in the submerged-arc overlaying welding flux-cored wire material of carbon Thermal tool steel composition as body of roll built-up welding working lining.
Adopt the build-up welding repair method of submerged-arc welding as cold-rolling support roll.In order to make the cold-rolling support roll surface obtain the wear-resisting working lining of high strength, high tenacity; To be fit to cold-rolling support roll condition of work in use; The YJ243-S welding wire of having selected the development and production of China Metallurgical Group Construction Research Institute institute of welding for use is as cold-rolling support roll operational layer; The YJ012-S welding wire selects for use the SJ600 sintered flux as the built-up welding solder flux as transition zone.
Because the carbon equivalent of 9Cr2Mo mother metal is higher, the tendency of hardenability of mother metal heat affected area and welding crack sensibility are bigger during built-up welding, and built-up welding property is relatively poor.Simultaneously, the size of general backing roll is bigger, and overlay cladding thickness is general all more than 15mm, and the welding stress during built-up welding is higher.For guaranteeing the good metallurgical binding between mother metal and the deposited metal; Guarantee that promptly the two has all good binding abilities of obdurability; Before being recommended in the working layer built-up welding; Use the higher solder wire material of low-carbon (LC) compression strength to carry out the transition zone built-up welding earlier, the embrittlement that further reduces mother metal and overlay cladding interface is to avoid producing localized delamination in the backing roll use.Therefore, the generation that avoid crackle is fully also wanted the built-up welding transition zone except that improving preheat temperature and interlayer temperature, through actual built-up welding verification experimental verification, selects for use the YJ012-S welding wire to cooperate SJ600 solder flux built-up welding transition zone in the literary composition.
2 build-up welding repair process
2.1 processing and detection before the weldering
In order to guarantee the effective working lining of cold-rolling support roll, the effective thickness of overlay cladding is minimum more than 10mm, and therefore, old fatigue layer and crackle are removed in processing earlier before the cold-rolling support roll built-up welding.In addition, for guaranteeing surfacing quality, must detect as follows cold-rolling support roll:
(1) roll neck flaw detection
Before roll surface processing, roll neck is carried out ultrasonic wave and penetrant inspection, if find that major defect is arranged (particularly in the body of roll and the roll neck transition region), then stop back road processing to this roller.
(2) roll surface turning processing
The roll surface fatigue layer is removed fully, and turning is to guaranteeing the overlay cladding thickness requirement.
(3) local defect soldering
For local defect, to guarantee that at first defective removes fully, the dark part of turning can adopt bottoming and transition zone wlding to carry out soldering, makes it smooth.
(4) roll surface flaw detection
Turning roll surface is detected, and whether turning reaches the body of roll to the inspection fatigue layer only whether has defectives such as crackle, if defectiveness still then need continue turning, removes a hidden danger.If ultrasonic inspection goes out roll surface serious internal injury is arranged, then do not allow to carry out again the built-up welding repair of this roller stock.
2.2 confirming of preheat temperature and interlayer temperature
The main purpose of preheating is to reduce the cooling velocity of deposited metal and heat affected area in the weld deposit process, reduces tendency of hardenability and also reduces welding stress, prevents that mother metal and deposited metal from undergoing phase transition to cause the crackle generation in weld deposit process.Definite need of preheat temperature are according to the carbon content of mother metal and resurfacing welding material and alloy content and decide.Because the alloy content of cold-rolling support roll mother metal and resurfacing welding material is all higher relatively; The size of backing roll and built-up welding thickness are all bigger in addition; Welding stress is big, so should improve preheating and interlayer temperature as far as possible, considers degree of admission in the practical operation again; Preheat temperature is confirmed as 350～400 ℃, and the welding bead interlayer temperature is controlled at more than 300 ℃.
2.3 bead-welding technology Determination of Parameters
The weld polarity that is adopted when the bead-welding technology parameter is meant built-up welding, gage of wire, welding current, weldingvoltage and built-up welding speed etc.In the roll overlaying that research is carried out is repaired, adopt the flux-cored wire of φ 3.2mm.
2.4 confirming of postwelding destressing tempering process parameters
The main purpose of postwelding destressing tempering is to remove thermal stress and the structural stress that in weld deposit process, produces, and makes the built-up welding tissue produce " post-curing " simultaneously, further improves and improve the wearability and the thermal fatigue resistance of deposited metal.According to the flux-cored wire deposited metal of the present invention's development and the alloying component of cold-rolling support roll mother metal, temperature is set in 550 ℃.And the common outline of temperature retention time is longer, on the one hand stress is fully discharged, and can promote that on the other hand the disperse of tiny carbide is separated out in the matrix, increases the wearability of overlay cladding.
The specific embodiment
The built-up welding of a unit backing roll of embodiment 1 Zhangjiagang Pu item stainless-steel cold-rolling is repaired
1, the YJ243-S welding wire of having selected the development and production of China Metallurgical Group Construction Research Institute institute of welding for use is as cold-rolling support roll operational layer, and the YJ012-S welding wire selects for use the SJ600 sintered flux as the built-up welding solder flux as transition zone.
2, the old fatigue layer and the crackle of cold-rolling support roll to be repaired removed in processing.
3, roll neck is carried out ultrasonic wave and penetrant inspection, if find that major defect is arranged (particularly in the body of roll and the roll neck transition region), then this roller is not suitable for subsequent technique.
4, the roll surface fatigue layer is removed fully, and turning to overlay cladding thickness is 12mm.
5, turning adopts bottoming and transition zone wlding to carry out soldering than the depths, makes it smooth.
6, turning roll surface is detected, whether turning reaches the body of roll to the inspection fatigue layer only whether has defectives such as crackle, if defectiveness still then need continue turning, removes a hidden danger.If ultrasonic inspection goes out roll surface serious internal injury is arranged, then do not allow to carry out again the built-up welding repair of this roller stock.
7, treat the repair cold-rolling support roll preheating, temperature is confirmed as 350 ℃, and the welding bead interlayer temperature is controlled at more than 300 ℃.
8, adopt the flux-cored wire of φ 3.2mm, welding current 300A, weldingvoltage 25V, speed of welding 20M/H, postheating.
9, postwelding destressing temperature is set in 550 ℃, and temperature retention time is slightly longer.
The built-up welding of No. three unit backing rolls of embodiment 2 Zhangjiagang Pu item stainless-steel cold-rolling is repaired
1, the YJ243-S welding wire of having selected the development and production of China Metallurgical Group Construction Research Institute institute of welding for use is as cold-rolling support roll operational layer, and the YJ012-S welding wire selects for use the SJ600 sintered flux as the built-up welding solder flux as transition zone.
2, the old fatigue layer and the crackle of cold-rolling support roll to be repaired removed in processing.
3, roll neck is carried out ultrasonic wave and penetrant inspection, if find that major defect is arranged (particularly in the body of roll and the roll neck transition region), then this roller is not suitable for subsequent technique.
4, the roll surface fatigue layer is removed fully, and turning to overlay cladding thickness is 15mm.
5, turning adopts bottoming and transition zone wlding to carry out soldering than the depths, makes it smooth.
6, turning roll surface is detected, whether turning reaches the body of roll to the inspection fatigue layer only whether has defectives such as crackle, if defectiveness still then need continue turning, removes a hidden danger.If ultrasonic inspection goes out roll surface serious internal injury is arranged, then do not allow to carry out again the built-up welding repair of this roller stock.
7, treat the repair cold-rolling support roll preheating, temperature is confirmed as 380 ℃, and the welding bead interlayer temperature is controlled at 330 ℃.
8, adopt the flux-cored wire of φ 3.2mm, welding current 400A, weldingvoltage 35V, speed of welding 25M/H, postheating.
9, postwelding destressing temperature is set in 565 ℃, and temperature retention time is slightly longer.
Claims (1)
1. the present invention relates to a kind of stainless-steel cold-rolling backing roll technology for repairing surfacing, belong to the metal manufacture field, it is characterized in that:
(1), selected YJ012-S built-up welding transition zone and YJ243-S flux-cored wire as the built-up welding working lining and be aided with weld preheating and the automatic submerged-arc bead-welding technology of postwelding tempering heat treatment carries out the built-up welding reparation to cold-rolling support roll according to arrowband stainless-steel cold-rolling backing roll applying working condition.
(2) to the rolling characteristic requirements of four-high mill cold-rolling support roll with and failure mode; And combine the concrete specification requirement of arrowband stainless-steel cold-rolling backing roll, the present invention select for use the Cr-Ni-Mo-V (or Cr-Ni-Mo-W-V) of Heat stability is good low in the submerged-arc overlaying welding flux-cored wire material of carbon Thermal tool steel composition as body of roll built-up welding working lining.
(3) in order to guarantee the effective working lining of cold-rolling support roll, the effective thickness of overlay cladding is minimum more than 10mm, and therefore, old fatigue layer and crackle are removed in processing earlier before the cold-rolling support roll built-up welding.In addition, for guaranteeing surfacing quality, must carry out roll neck flaw detection, roll surface turning processing, local defect soldering, roll surface flaw detection to cold-rolling support roll.
(4) condition of work of combination cold-rolling support roll, YJ012-S and YJ243-S flux-cored wire through development voluntarily carry out the built-up welding reparation to cold-rolling support roll.Cold-rolling support roll zero defect after built-up welding is repaired, its obdurability and wearability are superior to former 9Cr2Mo roll surface metal.
(5) cold-rolling support roll after the built-up welding reparation has carried out post-installation review on production line, with respect to former 9Cr2Mo roller, has improved service life more than 1 times, satisfies its serviceability requirement, and greatly reduces production cost.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110170628 CN102837116A (en) | 2011-06-23 | 2011-06-23 | Overlaying welding repairing technology of stainless steel cold-rolled bearing roller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110170628 CN102837116A (en) | 2011-06-23 | 2011-06-23 | Overlaying welding repairing technology of stainless steel cold-rolled bearing roller |
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| CN102837116A true CN102837116A (en) | 2012-12-26 |
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| CN 201110170628 Pending CN102837116A (en) | 2011-06-23 | 2011-06-23 | Overlaying welding repairing technology of stainless steel cold-rolled bearing roller |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706921A (en) * | 2013-12-23 | 2014-04-09 | 鞍钢实业集团冶金机械有限公司 | Build up welding repair method of supporting roller of hot continuous rolling finishing mill |
| CN105081521A (en) * | 2015-08-22 | 2015-11-25 | 湖北万安通复合再制造科技有限公司 | Precise surfacing welding method of high-hardness cold and hot rolls |
| CN106282522A (en) * | 2016-08-17 | 2017-01-04 | 安徽鼎恒再制造产业技术研究院有限公司 | A kind of shaft-like workpiece submerged arc welding pretreatment pre-heating technique |
| CN108311772A (en) * | 2018-01-17 | 2018-07-24 | 湖北理工学院 | The strength-toughening treatment process of roll stell Bead weld repair |
| CN112267013A (en) * | 2020-09-16 | 2021-01-26 | 山西富禄昌机械设备有限公司 | Supporting roller flow heat treatment process based on cold rolling and steps |
-
2011
- 2011-06-23 CN CN 201110170628 patent/CN102837116A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706921A (en) * | 2013-12-23 | 2014-04-09 | 鞍钢实业集团冶金机械有限公司 | Build up welding repair method of supporting roller of hot continuous rolling finishing mill |
| CN103706921B (en) * | 2013-12-23 | 2015-08-12 | 鞍钢实业集团冶金机械有限公司 | Hot-rolling finishing mill backing roll build-up welding repair method |
| CN105081521A (en) * | 2015-08-22 | 2015-11-25 | 湖北万安通复合再制造科技有限公司 | Precise surfacing welding method of high-hardness cold and hot rolls |
| CN106282522A (en) * | 2016-08-17 | 2017-01-04 | 安徽鼎恒再制造产业技术研究院有限公司 | A kind of shaft-like workpiece submerged arc welding pretreatment pre-heating technique |
| CN108311772A (en) * | 2018-01-17 | 2018-07-24 | 湖北理工学院 | The strength-toughening treatment process of roll stell Bead weld repair |
| CN112267013A (en) * | 2020-09-16 | 2021-01-26 | 山西富禄昌机械设备有限公司 | Supporting roller flow heat treatment process based on cold rolling and steps |
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Addressee: Zhangjiagang Kaina Information Technology Co., Ltd. Document name: Notification that Application Deemed to be Withdrawn |
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Application publication date: 20121226 |