CN103255412B - High hardness material laser cladding process method for roller work surface - Google Patents
High hardness material laser cladding process method for roller work surface Download PDFInfo
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- CN103255412B CN103255412B CN201210036736.5A CN201210036736A CN103255412B CN 103255412 B CN103255412 B CN 103255412B CN 201210036736 A CN201210036736 A CN 201210036736A CN 103255412 B CN103255412 B CN 103255412B
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Abstract
The invention discloses a high hardness material laser cladding process method for a roller work surface, wherein a laser cladding technology is adopted to carry out multi-layer cladding of a high hardness alloy powder material on a roller work surface so as to form a high hardness wear-resistance alloy welding layer on the surface. With the present invention, laser cladding process stability, and uniformity and consistency of a welding layer structure and components can be fundamentally ensured, generation of cracks, pores, inclusions and other cladding quality defects can be avoided, a heat affected zone of the matrix can be reduced, a dilution rate can be reduced, and the alloy welding layer with characteristics of firm metallurgy bonding, dense grain refining, high hardness, high wear resistance and high impact load bearing can be finally obtained, wherein the welding layer hardness is more than HRC 55. In addition, after the roller is subjected to rolling use on the machine after laser cladding repair, the total measured steel amount is increased by more than 2.2 times, roller consumption is reduced by 30-40%, and economic benefits are significant.
Description
Technical field
The invention belongs to material surface engineering technolog field, be specifically related to a kind of laser melting and coating process technology, particularly relate to a kind of processing method of the laser melting coating high hardness material for rolling face, the method is used for breaker roll working face and carries out large-area multilayer cladding.
Background technology
Roll is the instrument making (stocking) metal produce viscous deformation, and as the crucial spare parts of milling train, in rolling process, consumption is huge, is the important consumable part determining rolling mill efficiency and mill bar quality and output.Bear various Dynamic And Static Loads and cyclic stress during roll work, cause roll working-surface damage very serious and even scrap, thus make the production cost of Metallurgical Enterprise sharply increase.
In recent years, China's steel industry was with the speed fast development of average annual growth 20% ~ 30%, and within 2010, China produces nearly 6.3 hundred million tons of steel per year, accounts for 44.3% of global output of steel.Along with the increase of steel output, roll consumption amount increases sharply.Rough calculation, estimate if press loss per ton steel roll 1kg, only the roll consumption of 2010 is just about about 600,000 tons, consumes the value of roll then more than 18,000,000,000 yuan.Therefore, reparation for report waste or old roll is used and to the strengthening of new roll, modification again, and then improve the life cycle of roll and the life-span significant, become the Important Action that China's Metallurgical Enterprise reduces costs, increases the benefit, be also meet that China saves energy and reduce the cost, cleaner production, recycling economy fundamental state policy.At present; large area repair for roll is also only confined on more traditional technology for repairing surfacing; as shielded welding, electroslag welding, union-melt weld, plasma arc welding etc., and these traditional restorative procedures exist that high energy consumption, automatic production poor controllability, layer grain structure are thick, alloying constituent skewness, matrix thinning ratio and the series of problems such as heat affected zone is excessive.As Chinese patent CN03116017.4, wherein there is soaking time long, the problem that production efficiency is low in " large-scale roller hard-face overlaying welding restorative procedure "; Chinese patent CN201110126771.1, in " laser fast shaping repairs composite roll method ", there is the problems such as powder clinkering efficiency is too low, the production cycle is long, alloy solder layer is thin, equipment investment is large in the roll repair welding processing method of employing.For this reason, be necessary to develop a kind of brand-new roll repair welding treatment technology, to solve the many difficult problems existing for current roll repair welding.
Summary of the invention
The energy consumption existed for traditional built up welding technique of restoring roller is high, layer grain structure is thick, homogeneity of ingredients is poor, lower hardness, layer is easy to crack, the problem such as come off, the invention provides a kind of processing method of the laser melting coating high hardness material for rolling face, adopt this processing method by high rigidity, the alloy powder material big area that red hardness is good, multilayer cladding is in rolling face, repaired, the roll of preparation, its layer structure refinement is fine and close, flawless, the quality shortcoming such as to be mingled with, it is Metallurgical Enterprise repair and reconstruction roll, reduce a kind of important technical of production cost.
Technical scheme of the present invention is as follows:
For a processing method for the laser melting coating high hardness material of rolling face, the method application laser melting and coating technique, by the cladding of high hardness alloy powdered material multilayer in rolling face surface, forms high hardness wear-resisting alloy solder layer; Specifically comprise the steps:
1) roll process in early stage: the shortcoming such as corrosion, sand holes, crackle and the fatigue layer turning existed by roller surface is removed, the requirement of breaker roll substrate quality during to ensure laser melting coating;
2) roll thermal pretreatment: by through step 1) roll after process carries out thermal pretreatment, and wherein: preheating temperature 480 ~ 620 DEG C, rate of heating 100 ~ 200 DEG C/h is also incubated 1 ~ 2 hour;
3) laser melting coating processing: the roll after thermal pretreatment is carried out laser melting coating processing, laser cladding technological parameter is: laser power 6.0 ~ 10.0KW, sweep velocity 600 ~ 1000mm/min, spot size 15 × 1.5mm, overlapping rate 40 ~ 50%, single track cladding thickness 1.5 ~ 3.5mm, cladding width 15mm; In laser cladding process, roller substrate temperature is kept to be 400 ~ 600 DEG C;
4) slow cooling process is incubated: after laser melting coating process finishing, controlled by roller temperature at 380 ± 20 DEG C and be incubated 4 ~ 5 hours, then naturally cooling to room temperature;
5) inspection and mechanical workout: visual appearance, cladding size, surface hardness and non-destructive test(ing)(NDT) are carried out to the roll after insulation slow cooling process and detects, then according to work roll cooling requirement, carry out mechanical workout, replica.
Its material of described roll is cast steel, forged steel etc.
Described high hardness alloy powdered material is iron(-)base powder, powder size 80 ~ 400 order.
Its powdered alloy of described iron is purchased from Ha Genasi company of Sweden, and alloy designations is M2.
The alloy solder layer total thickness formed through aforesaid method is 5 ~ 35mm, hardness is greater than HRC 55.
The present invention has following beneficial effect:
1, the present invention is based on the laser cladding technological parameter of optimization, specific cladding powdered material and preheating insulation slow cooling heat-treat condition, achieve the cladding processing of the big area of high hardness material, multilayer, cladding layer thickness 5 ~ 35mm, alloy solder layer hardness is greater than HRC55, red hardness is good, and wear resisting property is excellent.
2, the present invention obtains the layer tissue of high quality without shortcoming, roll body surface flawless, to be mingled with and the cladding such as pore shortcoming, the refinement of layer dense structure, mother metal thinning ratio is low, layer alloying constituent and stable and reliable for performance, after the roll repaired uses on the machine, steel transportation amount is better than original material roll, and economic benefit is very remarkable.
3, present invention process method production efficiency is high, and energy consumption is few compared with traditional overlaying method, meets the policy needs of nation-building conservation-minded society, Sustainable development.
4, present invention process controllability is good, and labour intensity is low, easily is automated production.
5, the present invention can to scrap, damage roll repair again with or manufacture there is the new roller of specific function coating, thus reduce roll consumption cost for Metallurgical Enterprise, reduce ton steel cost, increase Business Economic Benefit.
Accompanying drawing explanation
Fig. 1 is roll laser cladding machining sketch chart of the present invention.
Fig. 2 is roll laser cladding of the present invention processing close-up schematic view.
Fig. 3 is the metallographic microstructure photo of the embodiment of the present invention 1.
Fig. 4 is the metallographic microstructure photo of the embodiment of the present invention 2.
In figure: 1 optical fiber laser; 2 robot slide rails; 3 robots; 4 operation optical fiber; 5 rolls; 6 turning rolls; 7 platens; 8 cladding processing heads; 9 gravity powder feed systems; 10 alloy solder layers; 11 powder-feeding nozzles; 12 laser molten pools.
Embodiment
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
In each embodiment breaker roll carry out the technical process of repairing and concrete steps as follows:
1) roll process in early stage: the shortcoming such as corrosion, sand holes, crackle and the fatigue layer turning existed by roller surface is removed, the requirement of breaker roll substrate quality during to ensure laser melting coating;
2) roll thermal pretreatment: by through step 1) roll after process carries out thermal pretreatment, and wherein: preheating temperature 480 ~ 620 DEG C, rate of heating 100 ~ 200 DEG C/h is also incubated 1 ~ 2 hour;
3) laser melting coating processing: the roll after thermal pretreatment is carried out laser melting coating processing, laser cladding technological parameter is: laser power 6.0 ~ 10.0KW, sweep velocity 600 ~ 1000mm/min, spot size 15 × 1.5mm, overlapping rate 40 ~ 50%, single track cladding thickness 1.5 ~ 3.5mm, cladding width 15mm; In laser cladding process, roller substrate temperature is kept to be 400 ~ 600 DEG C;
4) slow cooling process is incubated: after laser melting coating process finishing, controlled by roller temperature at 380 ± 20 DEG C and be incubated 4 ~ 5 hours, then naturally cooling to room temperature;
5) inspection and mechanical workout: visual appearance, cladding size, surface hardness and non-destructive test(ing)(NDT) are carried out to the roll after insulation slow cooling process and detects, then according to work roll cooling requirement, carry out mechanical workout, replica.
In embodiment, laser melting coating iron(-)base powder used is purchased from Ha Genasi company of Sweden, and its alloy designations is M2.This powdered alloy granularity 140 ~ 325 order, powdered alloy main component is as follows: C 0.90%, Si 0.30%, Mn 0.25%, Cr4.5%, W6.2%, Mo 5.1%, V 1.80%, Fe surplus.
As shown in Figure 1-2, turning rolls 6 is fixed on platen 7, and roll 5 is placed on turning rolls 6, and under the rotarily driving of machine tool chief axis, roll 5 rotates.Meanwhile, breaker roll 5 carries out thermal pretreatment, reaches the temperature of setting and carry out laser melting coating processing again in roll body temperature after certain hour insulation.Add man-hour, ensure that roll body temperature is within the scope of 400 ~ 600 DEG C, roll is uniform speed rotation by setup program.Simultaneously, be fixed on the speed of the robot 3 on robot slide rail 2 also according to program setting under the slip of slide rail drives axially at the uniform velocity to move along roll 5, cladding powder is delivered to roll 5 surface by powder-feeding nozzle 11 by gravity powder feed system 9, the laser that optical fiber laser 1 produces transfers to cladding processing head 8 through operation optical fiber 4 and after expanding focusing, arrives roll 5 surface, thus preset powder and body material fusing are formed laser molten pool 12, in roll 5 twirl process subsequently, laser molten pool 12 rapid solidification constantly forms alloy solder layer 10.After the cladding of whole roll 5 working face completes, breaker roll 5 carries out insulation slow cooling process.
Embodiment 1:
Material is certain hollow steel rolls working face major injury of 165CrNiMo, and this roller specification is
adopt present invention process method to carry out laser melting coating repair process to this roller, the rear indices of reparation all meets roll and uses on the machine standard.In the course of processing:
1) laser cladding technological parameter is: laser power 10KW, sweep velocity 1000mm/min, spot size 15 × 1.5mm, overlapping rate 50%, single track cladding thickness 3.5mm, cladding width 15mm, total cladding thickness is 35mm, and cladding material is iron(-)base powder.
2) heat-treatment technology method is: roll preheating temperature 580 ± 20 DEG C, rate of heating 120 DEG C/h, soaking time 2 hours; Heating and thermal insulation temperature 500 ± 20 DEG C in cladding process; Process finishing carries out the insulation of 380 ± 20 DEG C, 5 hours at once, then naturally cools to room temperature.
In the present embodiment, after laser melting coating, layer hardness is greater than HRC55.As shown in Figure 3, the very refined densification of ferrous alloy layer grain structure, layer tissue is primarily of phase composites such as a large amount of needle type martensites, carbide and a small amount of retained austenites, carbide hardness is very high, a large amount of even dispersion is distributed in layer tissue, under the even dispersion strengthening acting in conjunction of martensite and carbide, makes alloy solder layer extreme hardness, there is excellent wear resisting property, resistance to shock loads performance and red hardness, the applying working condition requirement of roll can be met well.Roll after process is after Metallurgical Enterprise uses on the machine, and steel transportation amount improves 2.5 times, and the reduction by 30% of roller consumption, economic benefit is very remarkable.
Embodiment 2:
Difference from Example 1 is:
Certain roll material is 70Mn2, and specification is
present invention process method is adopted to carry out laser melting coating reparation, in the course of processing to this roller working face:
1) laser cladding technological parameter is: laser power 6KW, sweep velocity 600mm/min, spot size 15 × 1.5mm, overlapping rate 40%, and single track cladding thickness 2.5mm, cladding width 15mm, total cladding thickness is 25mm.
2) heat-treatment technology method is: roll preheating temperature 520 ± 20 DEG C, rate of heating 150 DEG C/h, soaking time 1 hour; Heating and thermal insulation temperature 450 ± 20 DEG C in cladding process; Process finishing carries out the insulation of 380 ± 20 DEG C, 4 hours at once, then naturally cools to room temperature.
In the present embodiment, roll is after laser melting coating is repaired, and obtain good alloy solder layer, layer hardness reaches HRC61 ~ 64, and the machined rear non-destructive test(ing)(NDT) of layer detects good, without cladding crackle, the quality such as to be mingled with and to lack, meet this roller and use on the machine requirement.
As shown in Figure 4, as can be seen from the metallographic microstructure photo of this embodiment, alloy solder layer grain structure is very refined, fine and close, a large amount of carbide even dispersion is distributed in layer tissue, microhardness average reaches HV788, extreme hardness, has good wear resistance.Roll after the present embodiment reparation is after using on the machine, and steel transportation amount improves 2.2 times, and the reduction by 40% of roller consumption, economic benefit is obvious.
Above-described embodiment shows, adopt processing method of the present invention, not only can improve layer quality and work-ing life that Metallurgical Enterprise is repaired roll, and be a kind of important technical that roll manufacturing concern promotes new roller product performance, adopt processing method reparation of the present invention, prepare roll, more traditional overlaying process more can obtain the alloy solder layer of high-quality big area, heavy thickness, the very refined densification of layer grain structure, without cladding crackle, the quality shortcoming such as to be mingled with, hardness is greater than HRC55.Roll after reparation is after Metallurgical Enterprise uses on the machine, and steel transportation amount can improve more than 2.2 times, and roller consumption reduces 30-40%, and economic benefit is obvious.In addition, the invention belongs to the new roller reparation of energy-saving and cost-reducing environmental protection, manufacture treatment technology, meet modern enterprise and produce and national economic policy needs, there is important social effect.
Claims (8)
1. for a processing method for the laser melting coating high hardness material of rolling face, it is characterized in that: the method application laser melting and coating technique, by the cladding of high hardness alloy powdered material multilayer in rolling face, form high hardness wear-resisting alloy solder layer on its surface; Specifically comprise the steps:
1) roll process in early stage;
2) roll thermal pretreatment: by through step 1) roll after process carries out thermal pretreatment, wherein: preheating temperature 480 ~ 620 DEG C, rate of heating 100 ~ 200 DEG C/h, soaking time 1 ~ 2 hour;
3) laser melting coating processing: the roll after thermal pretreatment is carried out laser melting coating processing, laser cladding technological parameter is: laser power 6.0 ~ 10.0kW, sweep velocity 600 ~ 1000mm/min, spot size 15 × 1.5mm, overlapping rate 40 ~ 50%, single track cladding thickness 1.5 ~ 3.5mm, cladding width 15mm;
4) slow cooling process is incubated: after laser melting coating process finishing, controlled by roller temperature at 380 ± 20 DEG C and be incubated 4 ~ 5 hours, then naturally cooling to room temperature;
5) inspection and mechanical workout.
2. processing method according to claim 1, is characterized in that: its material of described roll is cast steel or forged steel.
3. processing method according to claim 1, is characterized in that: described high hardness alloy powdered material is iron(-)base powder, powder size 80 ~ 400 order.
4. processing method according to claim 3, is characterized in that: described iron(-)base powder is purchased from Ha Genasi company of Sweden, and alloy designations is M2.
5. processing method according to claim 1, is characterized in that: in step 3) in the laser melting coating course of processing, keep roller substrate temperature to be 400 ~ 600 DEG C.
6. processing method according to claim 1, is characterized in that: roll process in early stage is removed at the corrosion of roller surface existence, sand holes, crackle and fatigue layer turning.
7. processing method according to claim 1, it is characterized in that: inspection and mechanical workout be to insulation slow cooling process after roll carry out visual appearance, cladding size, surface hardness and non-destructive test(ing)(NDT) and detect, then according to work roll cooling requirement, mechanical workout, replica is carried out.
8. processing method according to claim 1, is characterized in that: described alloy solder layer total thickness is 5 ~ 35mm, hardness is greater than HRC 55.
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| CN201210036736.5A CN103255412B (en) | 2012-02-17 | 2012-02-17 | High hardness material laser cladding process method for roller work surface |
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Families Citing this family (10)
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| CN103088336B (en) * | 2013-01-29 | 2015-06-24 | 清华大学 | Laser cladding method for roller |
| CN103898518B (en) * | 2014-03-24 | 2017-04-19 | 杭州大冶激光科技有限公司 | Repairing method of cracks on roll surface of back-up roll of rolling mill |
| CN105441934B (en) * | 2014-08-12 | 2017-11-28 | 宝山钢铁股份有限公司 | The method that roller-way roll surface laser melting coating welds wearing layer |
| CN104357835B (en) * | 2014-11-11 | 2017-02-22 | 中国兵器工业第五二研究所 | Method for preparing laser cladding iron-based coating on port machine pulley |
| CN105290703B (en) * | 2015-11-04 | 2018-03-09 | 北京工业大学 | A kind of method that hot roll is worn with submerged arc overlay welding and laser melting coating reparation |
| CN105331975A (en) * | 2015-12-10 | 2016-02-17 | 天津工业大学 | Installing method for mandrel lathe semiconductor laser cladding system |
| CN108070767A (en) * | 2016-11-15 | 2018-05-25 | 宜兴市乐华冶金辅助材料有限公司 | A kind of corrosion-resistant high hardness material of mechanical equipment |
| WO2020124578A1 (en) * | 2018-12-21 | 2020-06-25 | 安徽马钢表面技术股份有限公司 | Automatic production line and process for laminar roller manufacturing |
| CN109536955B (en) * | 2019-01-23 | 2019-09-24 | 南京工业大学 | Using laser coaxial synchronous powder feeding system method cladding mould repair technique |
| CN113199200A (en) * | 2021-05-25 | 2021-08-03 | 常州冶俊机械设备有限公司 | Laser cladding repair process for end chamfer and roll neck of supporting roll |
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