CN103255412A - 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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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 the material surface engineering technical field, be specifically related to a kind of laser melting and coating process technology, the processing method that particularly relates to a kind of laser melting coating high hardness material for rolling face, this method are used for the breaker roll working face and carry out large-area multilayer cladding.
Background technology
Roll is to make (stocking) metal produce the instrument of viscous deformation, and as the crucial spare parts of milling train, consumption is huge in rolling process, is the important consumable part that determines milling train efficient and mill bar quality and output.Roll work the time is born various sound load and cyclic stress, causes the damage of roll working-surface very serious and even scrap, thereby makes the production cost of Metallurgical Enterprise sharply rise.
In recent years, China Steel industry was with the speed fast development of average annual growth 20%～30%, and China produced nearly 6.3 hundred million tons of steel per year in 2010, accounted for 44.3% of global output of steel.Along with the increase of steel output, the roll consumption amount increases sharply.Rough calculation, if press loss per ton steel roll 1kg estimation, only roll consumption in 2010 just about about 600,000 tons, consumes the value of roll then more than 18,000,000,000 yuan.Therefore, use again and to reinforcement, the modification of new roll for the reparation of scrapping old roll, and then life cycle and the life-span of improving roll are significant, become the important behave that China's Metallurgical Enterprise reduces cost, increases the benefit, also be meet that China is energy-saving and cost-reducing, the fundamental state policy of cleaner production, recycling economy.At present; big area reparation for roll also only is confined on more traditional technology for repairing surfacing; as shielded welding, electroslag welding, union-melt weld, plasma arc welding etc., and serial problem such as 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 heat affected zone are excessive.As Chinese patent CN03116017.4, " large-scale roller hard-face overlaying welding restorative procedure " wherein exists soaking time long, the problem that production efficiency is low; Chinese patent CN201110126771.1, in " laser fast shaping is repaired the composite roll method ", there are problems such as powder clinkering efficient is low excessively, the production cycle long, the alloy layer is thin, equipment has high input in the roll repair process of employing.For this reason, be necessary to develop a kind of brand-new roll repair process technology, repair existing many difficult problems to solve current roll.
Summary of the invention
Energy consumption height at traditional built up welding technique of restoring roller existence, the layer grain structure is thick, homogeneity of ingredients is poor, hardness is on the low side, layer is easy to crack, 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 with high rigidity, the alloy powder material big area that red hardness is good, the multilayer cladding is in rolling face, repair, the roll of preparation, its layer structure refinement densification, flawless, the quality shortcoming such as being mingled with, is Metallurgical Enterprise repair and reconstruction roll, a kind of important technical that reduces production costs.
Technical scheme of the present invention is as follows:
A kind of processing method of the laser melting coating high hardness material for rolling face, this method is used laser melting and coating technique, and the cladding of high hardness alloy powdered material multilayer in the rolling face surface, is formed high hardness wear-resisting alloy layer; Specifically comprise the steps:
1) roll is handled in earlier stage: the shortcoming turning such as corrosion, sand holes, crackle and fatigue layer that roller surface exists are removed the requirement of breaker roll substrate quality during with the assurance laser melting coating;
2) roll thermal pretreatment: the roll after step 1) is handled is carried out thermal pretreatment, wherein: 480～620 ℃ of preheating temperatures, 100～200 ℃/hour of rate of heating also are incubated 1～2 hour;
3) laser melting coating processing: the roll after the 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, keeping the roller substrate temperature is 400～600 ℃;
4) the insulation slow cooling is handled: after the laser melting coating process finishing, roller temperature control at 380 ± 20 ℃ and be incubated 4～5 hours, is naturally cooled to room temperature then;
5) check and mechanical workout: the roll after the insulation slow cooling processing is carried out visual appearance, cladding size, surface hardness and non-destructive test(ing)(NDT) detect, then according to the roll service requirements, 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 orders.
Its powdered alloy of described iron is purchased the Ha Genasi company in Sweden, and alloy designations is M2.
Be that 5～35mm, hardness are greater than HRC 55 through the formed alloy layer of aforesaid method total thickness.
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, the big area of high hardness material, the cladding processing of multilayer have been realized, cladding layer thickness 5～35mm, alloy layer hardness is greater than HRC55, red hardness is good, and wear resisting property is good.
2, the present invention obtains the layer tissue that high quality does not have shortcoming, roll body surface flawless, be mingled with and cladding shortcoming such as pore, the refinement of layer dense structure, the mother metal thinning ratio is low, layer alloying constituent and stable and reliable for performance, after the roll of repairing used on the machine, steel transportation amount was better than the original material roll, and economic benefit is very remarkable.
3, processing method production efficiency height of the present invention, energy consumption is few than the conventional stack soldering method, meets the policy needs of nation-building conservation-minded society, Sustainable development.
4, process controllability of the present invention is good, and labour intensity is low, easily is automated production.
5, the present invention can repair with again or make the new roller with specific function coating to scrapping, damage roll, thereby for Metallurgical Enterprise reduces the roll consumption cost, reduces ton steel cost, increase business economic benefit.
Description of drawings
Fig. 1 is roll laser cladding processing synoptic diagram of the present invention.
Fig. 2 processes local enlarged diagram for roll laser cladding of the present invention.
Fig. 3 is the metallographic microstructure photo of the embodiment of the invention 1.
Fig. 4 is the metallographic microstructure photo of the embodiment of the invention 2.
Among the 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 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.
Breaker roll is repaired among each embodiment technical process and concrete steps are as follows:
1) roll is handled in earlier stage: the shortcoming turning such as corrosion, sand holes, crackle and fatigue layer that roller surface exists are removed the requirement of breaker roll substrate quality during with the assurance laser melting coating;
2) roll thermal pretreatment: the roll after step 1) is handled is carried out thermal pretreatment, wherein: 480～620 ℃ of preheating temperatures, 100～200 ℃/hour of rate of heating also are incubated 1～2 hour;
3) laser melting coating processing: the roll after the 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, keeping the roller substrate temperature is 400～600 ℃;
4) the insulation slow cooling is handled: after the laser melting coating process finishing, roller temperature control at 380 ± 20 ℃ and be incubated 4～5 hours, is naturally cooled to room temperature then;
5) check and mechanical workout: the roll after the insulation slow cooling processing is carried out visual appearance, cladding size, surface hardness and non-destructive test(ing)(NDT) detect, then according to the roll service requirements, carry out mechanical workout, replica.
The used iron(-)base powder of laser melting coating is purchased the Ha Genasi company in Sweden among the embodiment, and its alloy designations is M2.These powdered alloy granularity 140～325 orders, the powdered alloy main component is as follows: C 0.90%, and Si 0.30%, and Mn 0.25%, Cr4.5%, W6.2%, Mo 5.1%, and V 1.80%, the Fe surplus.
Shown in Fig. 1-2, turning rolls 6 is fixed on the platen 7, and roll 5 places on the turning rolls 6, and under the rotation of machine tool chief axis drove, roll 5 rotated.Meanwhile, breaker roll 5 carries out thermal pretreatment, reaches the temperature of setting and carry out laser melting coating processing again after the certain hour insulation in the roll body temperature.Add man-hour, guarantee the roll body temperature in 400～600 ℃ of scopes, roll is the uniform speed rotation by setup program.Simultaneously, the robot 3 that is fixed on the robot slide rail 2 is also axially at the uniform velocity mobile along roll 5 according to the speed of program setting under the slip of slide rail drives, gravity powder feed system 9 is delivered to roll 5 surfaces with the cladding powder by powder-feeding nozzle 11, the laser that optical fiber laser 1 produces transfers to cladding processing head 8 and arrive roll 5 surfaces after expanding focusing through operation optical fiber 4, thereby powder and the body material fusing of presetting are formed laser molten pool 12, in roll 5 twirl processes subsequently, laser molten pool 12 rapid solidifications constantly form alloy layer 10.After whole roll 5 working face claddings were finished, breaker roll 5 was incubated slow cooling and handles.
Embodiment 1:
Material is certain hollow steel rolls working face major injury of 165CrNiMo, and this roller specification is
Adopt processing method of the present invention that this roller is carried out the laser melting coating repair process, the every index in reparation back all satisfies roll and uses on the machine standard.In the course of processing:
1) laser cladding technological parameter is: laser power 10KW, and 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, cladding material is iron(-)base powder.
2) heat-treatment technology method is: 580 ± 20 ℃ of roll preheating temperatures, 120 ℃/hour of rate of heating, soaking time 2 hours; The heat tracing temperature is 500 ± 20 ℃ in the cladding process; Process finishing is carried out 380 ± 20 ℃, 5 hours insulation at once, naturally cools to room temperature then.
In the present embodiment, layer hardness is greater than HRC55 behind the laser melting coating.As shown in Figure 3, ferrous alloy layer grain structure height refinement densification, the layer tissue is main by phase composites such as a large amount of needle type martensites, carbide and small amount of residual austenites, carbide hardness is very high, a large amount of even dispersion are distributed in the layer tissue, under the even dispersion reinforcement acting in conjunction of martensite and carbide, make alloy layer extreme hardness, have good wear resisting property, resistance to shock loads performance and red hardness, can satisfy the applying working condition requirement of roll well.Roll after the processing is after Metallurgical Enterprise uses on the machine, and steel transportation amount improves 2.5 times, and the roller consumption reduces by 30%, and economic benefit is very remarkable.
Embodiment 2:
Difference from Example 1 is:
Certain roll material is 70Mn2, and specification is
Adopt processing method of the present invention that this roller working face is carried out the laser melting coating reparation, in the course of processing:
1) laser cladding technological parameter is: laser power 6KW, and sweep velocity 600mm/min, spot size 15 * 1.5mm, overlapping rate 40%, single track cladding thickness 2.5mm, cladding width 15mm, total cladding thickness is 25mm.
2) heat-treatment technology method is: 520 ± 20 ℃ of roll preheating temperatures, 150 ℃/hour of rate of heating, soaking time 1 hour; The heat tracing temperature is 450 ± 20 ℃ in the cladding process; Process finishing is carried out 380 ± 20 ℃, 4 hours insulation at once, naturally cools to room temperature then.
In the present embodiment, roll has obtained good alloy layer after laser melting coating is repaired, and layer hardness reaches HRC61～64, and layer non-destructive test(ing)(NDT) after mechanical workout detects good, no cladding crackle, quality such as is mingled with and lacks, and satisfies this roller and uses on the machine requirement.
As shown in Figure 4, from the metallographic microstructure photo of this embodiment as can be seen, the refinement of gold alloy solder layer crystal grain tissue height, densification, a large amount of carbide even dispersion is distributed in the layer tissue, the microhardness average reaches HV788, and 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 roller consumption reduces by 40%, and economic benefit is obvious.
Above-described embodiment shows, adopt processing method of the present invention, not only can improve Metallurgical Enterprise and be repaired layer quality and the work-ing life of 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, preparation roll, more can obtain the alloy layer of high-quality big area, big thickness than the conventional stack welding process method, layer grain structure height refinement densification, no cladding crackle, the quality shortcoming such as be mingled with, hardness is greater than HRC55.Roll after the reparation is after Metallurgical Enterprise uses on the machine, and steel transportation amount can improve more than 2.2 times, and the roller consumption reduces 30-40%, and economic benefit is obvious.In addition, the invention belongs to new roller reparation, the manufacturing treatment technology of energy-saving and cost-reducing environmental protection, meet modern enterprise production and national economy policy needs, have great social significance.
Claims (8)
1. processing method that is used for the laser melting coating high hardness material of rolling face, it is characterized in that: this method is used laser melting and coating technique, and the cladding of high hardness alloy powdered material multilayer in rolling face, is formed high hardness wear-resisting alloy layer on its surface; Specifically comprise the steps:
1) roll is handled in earlier stage;
2) roll thermal pretreatment: the roll after step 1) is handled is carried out thermal pretreatment, wherein: 480～620 ℃ of preheating temperatures, 100～200 ℃/hour of rate of heating, soaking time 1～2 hour;
3) laser melting coating processing: the roll after the 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) the insulation slow cooling is handled: after the laser melting coating process finishing, roller temperature control at 380 ± 20 ℃ and be incubated 4～5 hours, is naturally cooled to room temperature then;
5) check and mechanical workout.
2. processing method according to claim 1, it is characterized in that: its material of described roll is cast steel or forged steel.
3. processing method according to claim 1, it is characterized in that: described high hardness alloy powdered material is iron(-)base powder, powder size 80～400 orders.
4. processing method according to claim 3, it is characterized in that: its powdered alloy of described iron is purchased the Ha Genasi company in Sweden, and alloy designations is M2.
5. processing method according to claim 1 is characterized in that: in the step 3) laser melting coating course of processing, keeping the roller substrate temperature is 400～600 ℃.
6. processing method according to claim 1 is characterized in that: it is that corrosion, sand holes, crackle and fatigue layer turning with roller surface exists is removed that roll is handled in earlier stage.
7. processing method according to claim 1, it is characterized in that: check and mechanical workout are that the roll after the insulation slow cooling is handled carries out visual appearance, cladding size, surface hardness and non-destructive test(ing)(NDT) detection, according to the roll service requirements, carry out mechanical workout, replica then.
8. processing method according to claim 1, it is characterized in that: described alloy layer total thickness is that 5～35mm, hardness are greater than HRC 55.
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Cited By (10)
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| CN103088336A (en) * | 2013-01-29 | 2013-05-08 | 清华大学 | Laser cladding method for roller |
| CN103898518A (en) * | 2014-03-24 | 2014-07-02 | 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 |
| CN104357835A (en) * | 2014-11-11 | 2015-02-18 | 中国兵器工业第五二研究所 | Method for preparing laser cladding iron-based coating on port machine pulley |
| CN105290703A (en) * | 2015-11-04 | 2016-02-03 | 北京工业大学 | Method for repairing abraded hot roll through submerged arc bead welding and laser cladding |
| CN105331975A (en) * | 2015-12-10 | 2016-02-17 | 天津工业大学 | Installing method for mandrel lathe semiconductor laser cladding system |
| CN105441934A (en) * | 2014-08-12 | 2016-03-30 | 宝山钢铁股份有限公司 | Method for welding wearing-resistant layer by laser cladding on roller way roll surface |
| 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 |
| CN109536955A (en) * | 2019-01-23 | 2019-03-29 | 南京工业大学 | Using laser coaxial synchronous powder feeding system method cladding mould repair technique |
| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105290703A (en) * | 2015-11-04 | 2016-02-03 | 北京工业大学 | Method for repairing abraded hot roll through submerged arc bead welding and laser cladding |
| 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 |
| CN109536955A (en) * | 2019-01-23 | 2019-03-29 | 南京工业大学 | Using laser coaxial synchronous powder feeding system method cladding mould repair technique |
| 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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