CN105290703A - Method for repairing abraded hot roll through submerged arc bead welding and laser cladding - Google Patents
Method for repairing abraded hot roll through submerged arc bead welding and laser cladding Download PDFInfo
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- CN105290703A CN105290703A CN201510742378.3A CN201510742378A CN105290703A CN 105290703 A CN105290703 A CN 105290703A CN 201510742378 A CN201510742378 A CN 201510742378A CN 105290703 A CN105290703 A CN 105290703A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
Abstract
The invention relates to a method for repairing an abraded hot roll through submerged arc bead welding and laser cladding and belongs to the technical field of surface treatment. The method comprises the following technological steps that firstly, the abraded surface of the abraded hot roll is machined through a lathe to remove surface cracks and a fatigue layer; secondly, a high-toughness transition layer is arranged on the roll surface through bead welding, and the hot roll repaired through bead welding is subjected to heat treatment and machined to be 1.2-1.6 mm smaller than a finished product in diameter; thirdly, a high-temperature abrasion resisting working layer with the thickness of 0.7-1.0 mm is arranged on the surface, obtained through bead welding, of the roll in a laser cladding manner through a laser cladding synchronous powder feeding method; and finally, finish machining is carried out until the regulated dimension and precision are achieved. According to the method, the bead welding technology and laser cladding technology are organically combined; and compared with previous production technologies and methods, the production cost is reduced, the repair risk of the roll is small, and the service life of the repaired roll is long.
Description
Technical field
The invention discloses a kind of method of wearing terrain submerged arc overlay welding and laser melting coating reparation, particularly a kind of method of submerged arc overlay welding and laser melting coating reparation wearing and tearing hot roll, belongs to technical field of surface.
Background technology
Hot roll is the key tool in Rolling production process, operationally bear the effect of mechanical load, thermal force and frictional force, hot roll surface should have good wear-resisting and heat resistance and good break resistance, this directly determines hot-rolled product quality, and the length in work roll cooling cycle and the cost of product closely related.Therefore the research improving hot roll surface abrasion resistance has caused extensive attention both domestic and external, and the material of hot roll is constantly improved and develops.In order to improve the surface abrasion resistance of hot roll, the material of hot roll is constantly improved, and its basic evolution is to semi-high speed steel and high-speed steel from chilled cast iron to rich chromium cast iron.
The main damage form of hot roll is Under Thermal Fatigue Damage, and namely be full of cracks and peeling phenomenon occur roller surface, simultaneously, it is also one of its dominant failure reason that roll is scrapped because of excessive wear, roller surface, once there is wear out failure, will cause whole roll to be scrapped, and will cause huge waste of material.Therefore the hot roll remediation intensification of wear out failure is become to the great difficult problem of long-standing problem roll manufacturing.
Bead weld repair is the technology that roll repair welding area research is maximum, Chinese invention patent CN103418923A discloses a kind of build-up welding repair method of worn rolls, it is characterized in that first the wear surface of worn rolls being carried out turnery processing, then the high tough transition zone of built-up welding on finished surface, build-up wear-resistant working lining on transition zone again, then Bead weld repair roll is heat-treated, finally be refined to given size and precision, this invention is by development of new resurfacing welding material and bead-welding technology, realize the high strength of worn rolls Bead weld repair layer, high rigidity, uniformity of hardness is good, there is good wearability and anti-fatigue performance, thus realize lengthening the life of Bead weld repair roll, Bead weld repair mainly adopts applicable technique and suitable resurfacing welding material that the roll of wearing and tearing is returned to original size, repair materials cost is relatively low, remediation efficiency is high, easily crack when major defect is built-up welding, the defects such as slag inclusion, hardness and surface refractory wearability not high enough.
Laser melting and coating technique is a kind of efficient, the process for modifying surface of energy saving standard, it by cladding material at matrix surface rapidly solidification, improve the surface property of material, in Aero-Space, military, automobile, shipbuilding, there is huge application prospect in the fields such as iron and steel, compared with traditional process for modifying surface, it is low that laser melting coating has cladding layer dilution rate, use material system scope wide, bond strength is high, less to matrix material heat affecting, part reparation can be carried out to inefficacy parts, coating layer thickness is controlled, the advantage such as easily to be automated, the wear-resisting of material surface can be improved, corrosion-resistant, the performances such as fire-resistant oxidation resistant, reduce the consumption of precious metal simultaneously, therefore this technology has broad application prospects in material surface modifying, in raising roller surface wearability, prolongation roll working life aspect obtains to be studied widely.Chinese invention patent CN104404510A discloses a kind of method that laser melting coating prepares gradient repairing cold rolling roller, mainly comprise and polished in the district to be repaired of cold roll, clean and blasting treatment, at the district to be repaired laid brazing flux in surface of cold roll, again by laid for solder powder on brazing flux, First Transition layer is prepared by high-temperature heating mode, by laid for transition powder on First Transition layer surface, the second transition zone is prepared by laser melting coating operation, finally by laid for alloy powder surperficial at the second transition zone, the 3rd gradient layer is prepared by laser melting coating operation, mainly start with from the structural design of cladding layer, cladding layer is designed to the alloy gradient layer with sandwich construction, solve cold roll reparation easily to crack afterwards, bond strength is lower, the problems such as easy generation comes off.The major defect of laser repairing is that laser cladding of material cost is high, cladding efficiency is low.
Technique for overlaying and laser melting and coating technique combine by the present invention, play respective technical advantage, avoid respective deficiency, technique for overlaying in the method is compared single Bead weld repair and is reduced technical requirement, adopt low-alloy, the welding material of low carbon content, reduce the possibility ftractureed in weld deposit process, the success rate of repairing is increased substantially, the reparation of breaker roll size is mainly completed in weld deposit process, because dimension of roller meets the requirements substantially, so do not need the laser cladding of material of more high cost, compare single laser melting coating repaired roller and greatly reduce rehabilitation cost, good by working surface performance after laser melting coating, reparation speed is fast, and do not limit by roll shape, reparation success rate is high.
Summary of the invention
The present invention is directed to existing wearing and tearing hot roll Problems existing in repair process, by the novel process that submerged arc overlay welding and laser melting coating combine, realize wearing and tearing hot roll repair layer and substrate combinating strength high, be not easy cracking, repair layer surface has high strength, high rigidity, good wearability and anti-fatigue performance, thus realizes repairing lengthening the life of hot roll.
The present invention can be realized by following measures:
First with the wear surface of lathe turning processing wearing and tearing hot roll, remove face crack and fatigue layer, then at the high tough transition zone of roller surface built-up welding, the hot roll of Bead weld repair is heat-treated, then be machined to and be less than finished diameter 1.2-1.6mm, then use the method for laser melting coating synchronous powder feeding system at the working lining of facing surface laser melting coating one deck high temperature wear resistant, be finally refined to given size and precision.Its concrete technology step is:
1. the wear surface of wearing and tearing hot roll is carried out turnery processing, remove fatigue layer and the crackle of wear surface, obtain bright and clean roller surface;
2. magnetic powder inspection detection is carried out on breaker roll surface flawless, if there is crackle, car is continued to flawless in local;
3. roll is steadily put into heating furnace preheating, preheat temperature 300-350 DEG C, preheating insulation time 4-10 hour, and use infrared thermometer measuring tempeature;
4. then at the high tough transition zone of above-mentioned wearing and tearing hot roll surface submerged arc overlay welding, the size that its heap is soldered 3.0-4.5mm larger than roll finished diameter, in roll overlaying process, weld interpass temperature controls at 200-300 DEG C;
5. the hot roll after step 4. Bead weld repair is heat-treated, burner hearth initial temperature should control at 280-350 DEG C, roll is heated to 560-600 DEG C with stove, temperature retention time 4-6 hour, cool with stove, temperature is down to less than 150 DEG C air coolings of coming out of the stove to room temperature, is then machined to and is less than finished diameter 1.2-1.6mm;
6. last surperficial at roll overlaying, utilize optical fiber laser, coordinate laser synchronization dust feeder, the monolateral thickness of laser melting coating one deck is the working lining of 0.7-1.0mm high temperature wear resistant, is finally refined to given size and precision.
Chemical composition and the mass fraction of described submerged arc overlay welding transition zone are: 0.15 ~ 0.25%C, 0.10 ~ 0.50%Si, 0.80 ~ 1.50%Mn, 0.55 ~ 1.20%Mo, 0.35 ~ 0.85%Ni, 1.50 ~ 2.85%Cr, 0.06 ~ 0.09%Y, S<0.030%, P<0.035%, surplus is Fe and inevitable impurity.
Chemical composition and the mass fraction of described laser melting coating high temperature wear resistant working lining are: 1.1 ~ 1.4%C, 15 ~ 18%Cr, 3.5 ~ 5.0%Si, 3.0 ~ 4.5%W, 3.0 ~ 4.5%Mo, 3.0 ~ 4.5%B, Fe<8.0%, surplus is Ni and inevitable impurity.
The present invention in built-up welding transition zone, carbon content control 0.15 ~ 0.25%, in the design of resurfacing welding material, C is most important intensified element, and be also cause crisp element, C has the effect of gap solution strengthening simultaneously, make overlay cladding have good toughness, in addition, add 0.10 ~ 0.50%Si, 0.80 ~ 1.50%Mn, 0.55 ~ 1.20%Mo, 0.35 ~ 0.85%Ni, 1.50 ~ 2.85%Cr, the effect of solution strengthening can be played, be conducive to the raising of overlay cladding intensity.Add 0.06 ~ 0.09%Y, can refinement and purification weld overlay materials, improve overlay cladding toughness and moulding.
The present invention is in laser cladding wear working lining, with Ni alloy for matrix, add 1.1 ~ 1.4%C, 15 ~ 18%Cr, 3.0 ~ 4.5%W, 3.0 ~ 4.5%Mo, mainly improves the hardness of working lining, wearability and high temperature resistant property, adds 3.5 ~ 5.0%Si simultaneously, 3.0 ~ 4.5%B, mainly B, Si are slag making elements, cover the slag of layer at clad layer surface.The slag formed in laser cladding process can isolated environment atmosphere, avoids scaling loss and the oxidation of alloying element.
Accompanying drawing explanation
Fig. 1 is submerged arc overlay welding and laser melting coating complex repairation hot roll structural representation.
In Fig. 1,1-hot roll body portion, 2-submerged arc overlay welding transition zone, 3-laser cladding wear working lining.
Fig. 2 is embodiment 1 gained cladding layer micro-organization chart.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described, but the present invention is not limited to following examples.
Embodiment 1:
A kind of roller diameter
the submerged arc overlay welding of wearing and tearing hot roll and laser melting coating restorative procedure, roll fertile material is 42CrMo, comprise following processing step: first with the wear surface of lathe turning processing wearing and tearing hot roll, remove face crack and hole, then at the high tough transition zone of roller surface built-up welding, the hot roll of Bead weld repair is heat-treated, be machined to and be less than finished diameter 1.2mm, then use the method for laser melting coating synchronous powder feeding system at the working lining of facing surface laser melting coating one deck high temperature wear resistant, be finally refined to given size and precision.Its concrete technology step is:
1. the wear surface of wearing and tearing hot roll is carried out turnery processing, monolateral car removes 5mm, removes fatigue layer and the crackle on surface, obtains bright and clean roller surface;
2. roll surface carries out magnetic powder inspection detection flawless.
3. hot roll is steadily put into heating furnace preheating, preheat temperature 350 DEG C, 4 hours preheating insulation time, use infrared thermometer measuring tempeature.
4. then at the high tough transition zone of above-mentioned wearing and tearing hot roll surface overlaying, the size that its heap is soldered 3.0mm larger than roll finished diameter, in roll overlaying process, weld interpass temperature controls at 200-270 DEG C;
5. heat-treated by the hot roll after above-mentioned Bead weld repair, burner hearth initial temperature should control at 280 DEG C, and roll is heated to 600 DEG C with stove, temperature retention time 4 hours, with stove cooling, temperature is down to less than 150 DEG C air coolings of coming out of the stove to room temperature, is then machined to and is less than finished diameter 1.2mm;
6. last on roll overlaying surface, utilize 6KW optical fiber laser, coordinate laser synchronization dust feeder, the monolateral thickness of laser melting coating one deck is the working lining of 0.7mm high temperature wear resistant, finally be refined to given size and precision, laser cladding technological parameter: laser power 2000W, sweep speed 4mm/s, powder feeding rate 15g/min, spot diameter 5 × 5mm, argon flow amount 15L/min, this clad layer surface microhardness can reach 700HV, and cladding layer microscopic structure is shown in Fig. 2.
Chemical composition and the mass fraction of described submerged arc overlay welding transition zone are: 0.18%C, 0.37%Si, 0.99%Mn, 0.58%Mo, 0.85%Ni, 1.77%Cr, 0.061%Y, 0.015%S, 0.028%P, and surplus is Fe and inevitable impurity;
Chemical composition and the mass fraction of described laser melting coating high temperature wear resistant working lining are: 1.12%C, 15.24%Cr, 3.68%Si, 4.45%W, 3.09%Mo, 4.47%B, 3.15%Fe, and surplus is Ni and inevitable impurity.
Embodiment 2:
A kind of roller diameter
the submerged arc overlay welding of wearing and tearing hot roll and laser melting coating restorative procedure, roll fertile material is 30Mn5, comprise following processing step: first with the wear surface of lathe turning processing wearing and tearing hot roll, remove face crack and hole, then at the high tough transition zone of roller surface built-up welding, the hot roll of Bead weld repair is heat-treated, then be machined to and be less than finished diameter 1.6mm, then use the method for laser melting coating synchronous powder feeding system at the working lining of facing surface laser melting coating one deck high temperature wear resistant, be finally refined to given size and precision.Its concrete technology step is:
1. the wear surface of wearing and tearing hot roll is carried out turnery processing, monolateral car removes 4mm, removes fatigue layer and the crackle on surface, obtains bright and clean roller surface;
2. roll surface carries out magnetic powder inspection detection crackle, and local car is to flawless.
3. hot roll is steadily put into heating furnace preheating, preheat temperature 300 DEG C, 10 hours preheating insulation time, use infrared thermometer measuring tempeature.
4. then at the high tough transition zone of above-mentioned wearing and tearing hot roll surface overlaying, the size that its heap is soldered 4.5mm larger than roll finished diameter, in roll overlaying process, weld interpass temperature controls at 240-300 DEG C;
5. heat-treated by the hot roll after above-mentioned Bead weld repair, burner hearth initial temperature should control at 350 DEG C, and roll is heated to 560 DEG C with stove, temperature retention time 6 hours, with stove cooling, temperature is down to less than 150 DEG C air coolings of coming out of the stove to room temperature, is then machined to and is less than finished diameter 1.6mm;
6. last on roll overlaying surface, utilize 6KW optical fiber laser, coordinate laser synchronization dust feeder, the monolateral thickness of laser melting coating one deck is the working lining of 1.0mm high temperature wear resistant, is finally refined to given size and precision, laser cladding technological parameter: laser power 2000W, sweep speed 4mm/s, powder feeding rate 15g/min, spot diameter 5 × 5mm, argon flow amount 15L/min.This clad layer surface microhardness can reach 713HV
Chemical composition and the mass fraction of described submerged arc overlay welding transition zone are: 0.24%C, 0.49%Si, 1.26%Mn, 1.14%Mo, 0.37%Ni, 2.61%Cr, 0.088%Y, 0.010%S, 0.024%P, and surplus is Fe and inevitable impurity;
Chemical composition and the mass fraction of described laser melting coating high temperature wear resistant working lining are: 1.38%C, 17.50%Cr, 4.81%Si, 3.09%W, 4.28%Mo, 3.04%B, 2.99%Fe, and surplus is Ni and inevitable impurity.
Embodiment 3:
A kind of roller diameter
the submerged arc overlay welding of wearing and tearing hot roll and laser melting coating restorative procedure, roll fertile material is 21CrMoV12-1, comprise following processing step: first with the wear surface of lathe turning processing wearing and tearing hot roll, remove face crack and hole, then at the high tough transition zone of roller surface built-up welding, the hot roll of Bead weld repair is heat-treated, then be machined to and be less than finished diameter 1.5mm, then use the method for laser melting coating synchronous powder feeding system at the working lining of facing surface laser melting coating one deck high temperature wear resistant, be finally refined to given size and precision.Its concrete technology step is:
1. the wear surface of wearing and tearing hot roll is carried out turnery processing, monolateral car removes 6mm, removes fatigue layer and the crackle on surface, obtains bright and clean roller surface;
2. roll surface carries out magnetic powder inspection detection flawless.
3. hot roll is steadily put into heating furnace preheating, preheat temperature 320 DEG C, 8 hours preheating insulation time, use infrared thermometer measuring tempeature.
4. then at the high tough transition zone of above-mentioned wearing and tearing hot roll surface overlaying, the size that its heap is soldered 3.8mm larger than roll finished diameter, in roll overlaying process, weld interpass temperature controls at 220-280 DEG C;
5. heat-treated by the hot roll after above-mentioned Bead weld repair, burner hearth initial temperature should control at 310 DEG C, and roll is heated to 580 DEG C with stove, temperature retention time 5 hours, with stove cooling, temperature is down to less than 150 DEG C air coolings of coming out of the stove to room temperature, is then machined to and is less than finished diameter 1.5mm;
6. last on roll overlaying surface, utilize 6KW optical fiber laser, coordinate laser synchronization dust feeder, the monolateral thickness of laser melting coating one deck is the working lining of 0.9mm high temperature wear resistant, is finally refined to given size and precision, laser cladding technological parameter: laser power 2000W, sweep speed 4mm/s, powder feeding rate 15g/min, spot diameter 5 × 5mm, argon flow amount 15L/min.This clad layer surface microhardness can reach 722HV.
Chemical composition and the mass fraction of described submerged arc overlay welding transition zone are: 0.21%C, 0.30%Si, 1.14%Mn, 0.87%Mo, 0.62%Ni, 1.99%Cr, 0.073%Y, 0.021%S, 0.033%P, and surplus is Fe and inevitable impurity;
Chemical composition and the mass fraction of described laser melting coating high temperature wear resistant working lining are: 1.28%C, 16.82%Cr, 3.94%Si, 391%W, 3.86%Mo, 3.75%B, 1.54%Fe, and surplus is Ni and inevitable impurity.
It is high that built-up welding of the present invention and laser melting coating repair hot roll working lining hardness, uniformity of hardness is good, transition zone has good obdurability, in use roll surface wearing is even, do not occur peeling off and cracking phenomena, built-up welding of the present invention and laser melting coating repair the wearability of hot roll, improve more than 40% than employing single build-up welding repair method reparation hot roll, promote built-up welding of the present invention and laser melting coating reparation hot roll technology, there is good economic and social benefit.
Claims (3)
1. one kind with submerged arc overlay welding and laser melting coating reparation wearing and tearing hot roll method, it is characterized in that, first with the wear surface of lathe turning processing wearing and tearing hot roll, remove face crack and fatigue layer, then at the high tough transition zone of roller surface built-up welding, the hot roll of Bead weld repair is heat-treated, then be machined to and be less than finished diameter 1.2-1.6mm, then use the method for laser melting coating synchronous powder feeding system at the working lining of facing surface laser melting coating one deck high temperature wear resistant, finally be refined to given size and precision, its concrete technology step is:
1. the wear surface of wearing and tearing hot roll is carried out turnery processing, remove fatigue layer and the crackle of wear surface, obtain bright and clean roller surface;
2. magnetic powder inspection detection is carried out on breaker roll surface flawless, if there is crackle, car is continued to flawless in local;
3. roll is steadily put into heating furnace preheating, preheat temperature 300-350 DEG C, preheating insulation time 4-10 hour, and use infrared thermometer measuring tempeature;
4. then at the high tough transition zone of above-mentioned wearing and tearing hot roll surface submerged arc overlay welding, the size that its heap is soldered 3.0-4.5mm larger than roll finished diameter, in roll overlaying process, weld interpass temperature controls at 200-300 DEG C;
5. the hot roll after step 4. Bead weld repair is heat-treated, burner hearth initial temperature should control at 280-350 DEG C, roll is heated to 560-600 DEG C with stove, temperature retention time 4-6 hour, cool with stove, temperature is down to less than 150 DEG C air coolings of coming out of the stove to room temperature, is then machined to and is less than finished diameter 1.2-1.6mm;
6. last surperficial at roll overlaying, utilize optical fiber laser, coordinate laser synchronization dust feeder, the monolateral thickness of laser melting coating one deck is the working lining of 0.7-1.0mm high temperature wear resistant, is finally refined to given size and precision.
2. according to a kind of submerged arc overlay welding according to claim 1 and laser melting coating reparation wearing and tearing hot roll method, it is characterized in that, the chemical composition of submerged arc overlay welding transition zone and mass fraction are: 0.15 ~ 0.25%C, 0.10 ~ 0.50%Si, 0.80 ~ 1.50%Mn, 0.55 ~ 1.20%Mo, 0.35 ~ 0.85%Ni, 1.50 ~ 2.85%Cr, 0.06 ~ 0.09%Y, S<0.030%, P<0.035%, surplus is Fe and inevitable impurity.
3. according to a kind of submerged arc overlay welding according to claim 1 and laser melting coating reparation wearing and tearing hot roll method, it is characterized in that, chemical composition and the mass fraction of laser melting coating high temperature wear resistant working lining are: 1.1 ~ 1.4%C, 15 ~ 18%Cr, 3.50 ~ 5.0%Si, 3.0 ~ 4.5%W, 3.0 ~ 4.5%Mo, 3.0 ~ 4.5%B, Fe<8.0%, surplus is Ni and inevitable impurity.
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