CN103805934A - Method for strengthening surface of metal roller by adopting electro-spark deposition method and plasma fusion covering method - Google Patents
Method for strengthening surface of metal roller by adopting electro-spark deposition method and plasma fusion covering method Download PDFInfo
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- CN103805934A CN103805934A CN201410078306.9A CN201410078306A CN103805934A CN 103805934 A CN103805934 A CN 103805934A CN 201410078306 A CN201410078306 A CN 201410078306A CN 103805934 A CN103805934 A CN 103805934A
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Abstract
The invention relates to a method for strengthening a surface of a metal roller by adopting an electro-spark deposition method and a plasma fusion covering method. The metal roller is processed in an electro-spark deposition way and a plasma fusion covering way, so that the problems for improving the hardness, abrasion resistance and impact resistance of the surface of the roller and prolonging the service life of the metal roller can be effectively solved. The method comprises the following steps: performing fusion covering of alloy powder onto the surface of the roller by utilizing non-oxidized plasma beam to form a molten alloy coating, depositing WC ceramic hard alloy by utilizing the electro-spark deposition way on the basis of the plasma fusion covering coating to form a composite coating integrating the electro-spark deposition and plasma fusion covering. The method is simple and practical, the electro-spark deposition and the plasma fusion covering composite coating is firmly combined with a substrate, the thickness of the coating is large, so that the surface hardness, compactness, heat resistance and abrasion resistance of the roller are good, and the service life is long; by adopting the composite coating, the price of the iron-nickel alloy powder is low, the thickness of the coating is large, the abrasion resistance and corrosion resistance are good, the hardness and strength are high, and the abrasion and heat resistance is excellent.
Description
Technical field
The present invention relates to metal roller, particularly a kind of method that strengthens metal roller surface with electric spark deposition in conjunction with plasma cladding.
Background technology
In iron and steel metallurgy industry, along with China has become maximum in the world production country, and steel rolling is a key areas in Iron and Steel Production, roll is the important tool of Steel Plant's rolled sheet material (steel band) or reinforcing bar, is also one of main consumption spare part in Rolling Production.The working conditions of roll is generally very severe, and it will bear very complicated repeated load and impact, and the working conditions of rapid heat cycle, except requiring it to have enough obdurabilities, also requires it to have higher wear resistance, thermotolerance and shock resistance.Therefore, improve the hardness of roller surface, can reduce the abrasion loss that roll uses, adopt roller surface repair and intensify technology to improve roller surface hardness, become the main development direction and the approach that extend roll campaign, the research application of this respect has made some progress.
Metal roller is generally formed through casting or forging by spheroidal graphite cast iron, high chromium nickel cast iron ning, carbon constructional quality steel, structural alloy steel, after machine-shaping, directly install and use or after surface hardening is processed, install and use again, mainly contain laser surface hardening, surperficial medium frequency quenching, resistance furnace integral heating quenching, differential quenching, surface overlaying high-abrasive material, thermal spraying on surface (comprising flame plating, plasma spraying, electric arc spraying and supersonic spray coating) wear heat-resistant material, Laser Clad Alloy Coatings etc. for the method for roller surface hardening.Laser surface hardening hardened layer and facility investment are large, maintenance cost is high; Surface medium frequency quenching, resistance furnace integral heating quenching, differential quenching method are applicable to structural carbon steel and structural alloy steel, but laser quenching hardened layer poor heat resistance can not be used for hot rolling; Surface overlaying high-abrasive material cost is high, and has the problem of surface working difficulty; Thermal spraying on surface pre-treatment generally adopts sandblast, has environmental pollution, coating processing difficulties, and it is poor that coating is combined with matrix, and coating fatiguability peels off; The needed large-scale laser of Laser Clad Alloy Coatings involves great expense, and laser melting coating bundle lap-joint defect is many, and cladding layer post-treatment is also more difficult.Therefore, how metal roller surface being processed, strengthen its wear resistance, prevent from coming off, increase the service life, is technical problem urgently to be resolved hurrily.
Summary of the invention
For above-mentioned situation, for overcoming the defect of prior art, the present invention's object is just to provide a kind of method that strengthens metal roller surface with electric spark deposition in conjunction with plasma cladding, metal roller is carried out to electric spark deposition in conjunction with plasma cladding processing, can effectively solve the performance such as surperficial hardness, wear resistance and shock-resistance of roll, the problem that extends the work-ing life of metal roller.
The technical scheme that the present invention solves is, with non-oxidizing plasma beam powdered alloy cladding on roller surface, form molten alloy coating, and then on the basis of plasma cladding coating with electric spark deposition WC ceramic hard alloy, form the compound coating of electric spark deposition in conjunction with plasma cladding, step is:
(1), preparation Fe-Ni Alloy Powder, this powdered alloy is by by weight percentage: the powder that Ni 31～32%, Cr 26～30%, C 1～2%, Mo 3～4.5%, B 2.5～3%, Si 3.5～5%, W 2～4.5% and surplus are Fe, mixes composition;
(2), adopt the wear-resisting equipment of plasma cladding (known common equipment, as Qingdao HaiNa Plasma Science Co., Ltd, or Henan IGOOD Wear-resisting Technology Co., Ltd.) breaker roll surface cladding Fe-Ni Alloy Powder layer, input supply voltage: 380V ± 10%, specified input capacity: 30KVA, output voltage: 75V, operating voltage: 10～30V, output rating 12-15KW, outward current: 300～600A, sweep velocity: 300～600mm/min, powder feeder air-flow: 0.65～0.75m
3/ h, powder sending quantity is 250-300g/min, ionized gas flow: 0.6～0.9m
3/ h, shield gas flow rate: 0.65～0.75m
3/ h, nozzle diameter 5mm, nozzle distance workpiece 28-32mm;
(3), cladding Fe-Ni Alloy Powder layer method is, open the worktable operation of the wear-resisting equipment of plasma cladding, make plasmatorch move on to roll treatment sites top, open plasmatorch shielding gas argon gas and the power supply starting the arc, with the processing parameter providing in step (2), press the routine operation method of the wear-resisting equipment of plasma cladding, plasma beam cladding is carried out on breaker roll surface, at high temperature 10000-16000 ℃ of direct current plasma line, the Fe-Ni Alloy Powder configuring in step (1) is synchronously sent in the plasma beam of plasmatorch, roller surface forms the molten bath close with beam diameter size fast successively, powder is through rapid heating, be fusing or semi-molten state and molten pool metal mixing diffusion reaction, along with the movement of plasma beam, solidify rapidly in alloy molten bath, form the plasma cladding alloy coat that is metallurgical binding with matrix,
(4), after cladding alloy coat, close plasmatorch power supply and source of the gas, the alloy coat of breaker roll surface cladding carries out grinding or polishing, adopt again electric spark deposition equipment (known common equipment, as the DZS-4000 type electric spark deposition equipment of Beijing absolute sincerity letter power technology development company or the production of agrotechnique institute of Chinese science research institute), by electrode materials WC or TiC Wimet electrode bar, as work positive electrode, the roll making it in argon gas and be deposited does to produce between negative electrode spark discharge, directly utilize the energy of spark discharge, 10
-5～10
-6the position that in s, electrode contacts with roll (workpiece) reaches 10000～24500 ℃, electrode materials is transferred to the alloy coat surface of having been processed by plasma cladding, form electric spark deposition in conjunction with plasma cladding compound coating, electrode adopts self rotation mode, the method of clamping of electrode is mechanical system, and output rating is 3400W, and output voltage is 200V, discharge frequency is 1800HZ, and sedimentation rate is 2.5min/cm
2, shielding gas argon flow amount is 8～10L/min, and the extended length of electrode is 3mm, and metal roller matrix surface coat-thickness after electric spark deposition is in conjunction with plasma cladding is 1-4mm.
The present invention is simple and practical, and the electric spark deposition that the present invention forms is combined firmly with matrix in conjunction with plasma cladding compound coating, and coat-thickness is large, make that roller surface hardness is high, compactness good, thermotolerance and wear resisting property good, long service life; Compound coating has brought into play that Fe-Ni Alloy Powder is cheap, coat-thickness is large, wear-resistant etch resistant properties is good, and the hardness intensity of having brought into play again electric spark deposition ceramic hard alloy is high, the Comprehensive Characteristics of antiwear heat resisting excellent performance.On roll, carry out the very large in iron and steel metallurgical industry market potential of surface metallurgic processing with electric spark deposition in conjunction with plasma cladding method.
Accompanying drawing explanation
Fig. 1 is metal roller structural representation of the present invention (partly cut-away).
Fig. 2 is the sectional front view of metal roller of the present invention.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is elaborated.
The present invention, in concrete enforcement, is realized by following steps:
(1), preparation Fe-Ni Alloy Powder, this powdered alloy is by by weight percentage: the powder that Ni 31%, Cr 28%, C 1.5%, Mo 4%, B 2.8%, Si 4%, W 3% and surplus are Fe, mix composition, granularity is 106～180mm;
(2), adopt the wear-resisting equipment breaker roll of plasma cladding surface cladding Fe-Ni Alloy Powder layer, input supply voltage: 380V ± 10%, specified input capacity: 30KVA, output voltage: 75V, operating voltage: 10～30V, output rating 12-15KW, outward current: 300～600A, sweep velocity: 300～600mm/min, powder feeder air-flow: 0.65～0.75m
3/ h, powder sending quantity is 250-300g/min, ionized gas flow: 0.6～0.9m
3/ h, shield gas flow rate: 0.65～0.75m
3/ h, nozzle diameter 5mm, nozzle distance workpiece 28-32mm;
(3), the method of cladding Fe-Ni Alloy Powder layer 2 is, open the worktable operation of the wear-resisting equipment of plasma cladding, make plasmatorch move on to roll treatment sites top, open plasmatorch shielding gas argon gas and the power supply starting the arc, with the processing parameter providing in step (2), press the routine operation method of the wear-resisting equipment of plasma cladding, plasma beam cladding is carried out on breaker roll surface, at high temperature 10000-16000 ℃ of direct current plasma line, the Fe-Ni Alloy Powder configuring in step (1) is synchronously sent in the plasma beam of plasmatorch, roller surface forms the molten bath close with beam diameter size fast successively, powder is through rapid heating, be fusing or semi-molten state and molten pool metal mixing diffusion reaction, along with the movement of plasma beam, solidify rapidly in alloy molten bath, form the plasma cladding alloy coat that is metallurgical binding with matrix,
(4), after cladding alloy coat, close plasmatorch power supply and source of the gas, the alloy coat of breaker roll surface cladding carries out grinding or polishing, adopt again DZS-4000 type electric spark deposition equipment, by electrode materials WC or TiC Wimet electrode bar, as work positive electrode, the roll that makes it in argon gas and be deposited does to produce between negative electrode spark discharge, directly utilize the energy of spark discharge, 10
-5～10
-6the position that in s, electrode contacts with roll (workpiece) reaches 10000～24500 ℃, electrode materials is transferred to the alloy coat surface of having been processed by plasma cladding, form electric spark deposition in conjunction with plasma cladding compound coating 3, electrode adopts self rotation mode, the method of clamping of electrode is mechanical system, and output rating is 3400W, and output voltage is 200V, discharge frequency is 1800HZ, and sedimentation rate is 2.5min/cm
2, shielding gas argon flow amount is 8～10L/min, and the extended length of electrode is 3mm, and metal roller matrix surface coat-thickness after electric spark deposition is in conjunction with plasma cladding is 1-4mm.
In specific embodiment of the invention, described Fe-Ni Alloy Powder also can adopt the powder that weight percent meter: Ni 32%, Cr 26%, C 2%, Mo 3%, B 3%, Si 3.5%, W 4.5% and surplus are Fe, mix composition, the other the same as in Example 1.
In specific embodiment of the invention, described Fe-Ni Alloy Powder also can adopt the powder that weight percent meter: Ni 31%, Cr 30%, C 1%, Mo 4.5%, B 2.5%, Si 5%, W 2% and surplus are Fe, mix composition, the other the same as in Example 1.
Through experiment and test, there are a large amount of nano amorphous microcrystal grains in the present invention, coating density is high in coating; In 16000 ℃ of plasma claddings and electric spark deposition, the high temperature of 25000 ℃ makes compound coating and matrix produce the metallurgical binding that coating can not come off; The surface hardness of coating can reach 1707.6HV～2084.1HV, and the hardness of matrix is 352.1 HV, and the hardness of the hardness ratio matrix of coating can improve 4-6 doubly; The wear resistance of compound coating can improve 2-4 doubly than the wear resistance of matrix.Compared with prior art, there is following outstanding useful technique effect:
1, to adopt metal roller be to process cladding object in the present invention; can be at the position easy to wear of part or working position obtain that the high-bond, high rigidity, high compactness, high heat resistance etc. of high surfaces planeness can freely control cladding alloy hardened layer; the thickness that obtains cladding wearing layer under argon shield state is 1～4mm; the hardness of cladding layer is HRC60～72, and wear resistance improves 2～4 times.So just improve the wear-and corrosion-resistant impact resistance of metal roller material surface, and then the work-ing life of having improved roll.
2, the present invention makes to have formed in electrical spark region, the top layer of compound coating the high rigidity non-equilibrium alloy tissue containing, contain a large amount of nano microcrystalline particles, its hardening mechanism is nano-amorphous strengthening, crystallite strengthening, super saturated solid solution strengthening, high hardness compound dispersion-strengthened etc.
3, the present invention is that on metal roller, the method by high-energy beam makes to have high rigidity, the powdered alloy of high strength, high-wearing feature and the cladding of ceramic hard alloy be on the surface of metal roller material, form the composite alloy layer of one deck and matrix metallurgical binding, wear-resistant, shock-resistant, high temperature resistant, corrosion-resistant.On the roll mother metal of single metallurgical bath in infinitely-great cold conditions in cladding depositing treatment process, so the speed of cooling in molten bath is very large, with regard to whole roll, still lower in normal temperature state or temperature rise, roll can not be annealed or thermal distortion.
4, on metal roller, after cladding powdered alloy and ceramic deposition Wimet, thickness, quality and the working efficiency of compound coating are relevant with cladding deposition process parameters voltage, electric current, frequency and speed etc., therefore can be by the adjusting of processing parameter being controlled to obtain different technological effects.Method is simple, easy to operate, and good product quality has very strong actual application value, can be widely used in iron and steel metallurgical industry, and economic and social benefit is huge.
Claims (4)
1. a method that strengthens metal roller surface with electric spark deposition in conjunction with plasma cladding, is characterized in that, comprises the following steps:
(1), preparation Fe-Ni Alloy Powder, this powdered alloy is by by weight percentage: the powder that Ni 31～32%, Cr 26～30%, C 1～2%, Mo 3～4.5%, B 2.5～3%, Si 3.5～5%, W 2～4.5% and surplus are Fe, mixes composition;
(2), adopt the wear-resisting equipment breaker roll of plasma cladding surface cladding Fe-Ni Alloy Powder layer, input supply voltage: 380V ± 10%, specified input capacity: 30KVA, output voltage: 75V, operating voltage: 10～30V, output rating 12-15KW, outward current: 300～600A, sweep velocity: 300～600mm/min, powder feeder air-flow: 0.65～0.75m
3/ h, powder sending quantity is 250-300g/min, ionized gas flow: 0.6～0.9m
3/ h, shield gas flow rate: 0.65～0.75m
3/ h, nozzle diameter 5mm, nozzle distance workpiece 28-32mm;
(3), cladding Fe-Ni Alloy Powder layer method is, open the worktable operation of the wear-resisting equipment of plasma cladding, make plasmatorch move on to roll treatment sites top, open plasmatorch shielding gas argon gas and the power supply starting the arc, with the processing parameter providing in step (2), press the routine operation method of the wear-resisting equipment of plasma cladding, plasma beam cladding is carried out on breaker roll surface, at high temperature 10000-16000 ℃ of direct current plasma line, the Fe-Ni Alloy Powder configuring in step (1) is synchronously sent in the plasma beam of plasmatorch, roller surface forms the molten bath close with beam diameter size fast successively, powder is through rapid heating, be fusing or semi-molten state and molten pool metal mixing diffusion reaction, along with the movement of plasma beam, solidify rapidly in alloy molten bath, form the plasma cladding alloy coat that is metallurgical binding with matrix,
(4), after cladding alloy coat, close plasmatorch power supply and source of the gas, the alloy coat of breaker roll surface cladding carries out grinding or polishing, adopt again electric spark deposition equipment, by electrode materials WC or TiC Wimet electrode bar, as work positive electrode, the roll that makes it in argon gas and be deposited does to produce between negative electrode spark discharge, directly utilize the energy of spark discharge, 10
-5～10
-6the position that in s, electrode contacts with roll reaches 10000～24500 ℃, electrode materials is transferred to the alloy coat surface of having been processed by plasma cladding, form electric spark deposition in conjunction with plasma cladding compound coating, electrode adopts self rotation mode, the method of clamping of electrode is mechanical system, and output rating is 3400W, and output voltage is 200V, discharge frequency is 1800HZ, and sedimentation rate is 2.5min/cm
2, shielding gas argon flow amount is 8～10L/min, and the extended length of electrode is 3mm, and metal roller matrix surface coat-thickness after electric spark deposition is in conjunction with plasma cladding is 1-4mm.
2. the method that strengthens metal roller surface with electric spark deposition in conjunction with plasma cladding according to claim 1, is characterized in that, is realized by following steps:
(1), preparation Fe-Ni Alloy Powder, this powdered alloy is by by weight percentage: the powder that Ni 31%, Cr 28%, C 1.5%, Mo 4%, B 2.8%, Si 4%, W 3% and surplus are Fe, mixes composition;
(2), adopt the wear-resisting equipment breaker roll of plasma cladding surface cladding Fe-Ni Alloy Powder layer, input supply voltage: 380V ± 10%, specified input capacity: 30KVA, output voltage: 75V, operating voltage: 10～30V, output rating 12-15KW, outward current: 300～600A, sweep velocity: 300～600mm/min, powder feeder air-flow: 0.65～0.75m
3/ h, powder sending quantity is 250-300g/min, ionized gas flow: 0.6～0.9m
3/ h, shield gas flow rate: 0.65～0.75m
3/ h, nozzle diameter 5mm, nozzle distance workpiece 28-32mm;
(3), the method of cladding Fe-Ni Alloy Powder layer 2 is, open the worktable operation of the wear-resisting equipment of plasma cladding, make plasmatorch move on to roll treatment sites top, open plasmatorch shielding gas argon gas and the power supply starting the arc, with the processing parameter providing in step (2), press the routine operation method of the wear-resisting equipment of plasma cladding, plasma beam cladding is carried out on breaker roll surface, at high temperature 10000-16000 ℃ of direct current plasma line, the Fe-Ni Alloy Powder configuring in step (1) is synchronously sent in the plasma beam of plasmatorch, roller surface forms the molten bath close with beam diameter size fast successively, powder is through rapid heating, be fusing or semi-molten state and molten pool metal mixing diffusion reaction, along with the movement of plasma beam, solidify rapidly in alloy molten bath, form the plasma cladding alloy coat that is metallurgical binding with matrix,
(4), after cladding alloy coat, close plasmatorch power supply and source of the gas, the alloy coat of breaker roll surface cladding carries out grinding or polishing, adopt again DZS-4000 type electric spark deposition equipment, by electrode materials WC or TiC Wimet electrode bar, as work positive electrode, the roll that makes it in argon gas and be deposited does to produce between negative electrode spark discharge, directly utilize the energy of spark discharge, 10
-5～10
-6the position that in s, electrode contacts with roll reaches 10000～24500 ℃, electrode materials is transferred to the alloy coat surface of having been processed by plasma cladding, form electric spark deposition in conjunction with plasma cladding compound coating 3, electrode adopts self rotation mode, the method of clamping of electrode is mechanical system, and output rating is 3400W, and output voltage is 200V, discharge frequency is 1800HZ, and sedimentation rate is 2.5min/cm
2, shielding gas argon flow amount is 8～10L/min, and the extended length of electrode is 3mm, and metal roller matrix surface coat-thickness after electric spark deposition is in conjunction with plasma cladding is 1-4mm.
3. the method that strengthens metal roller surface with electric spark deposition in conjunction with plasma cladding according to claim 1, it is characterized in that, the powder that described Fe-Ni Alloy Powder is Fe by weight percent meter: Ni 32%, Cr 26%, C 2%, Mo 3%, B 3%, Si 3.5%, W 4.5% and surplus, mixes composition.
4. according to the method that strengthens metal roller surface with electric spark deposition in conjunction with plasma cladding claimed in claim 1, it is characterized in that, the powder that described Fe-Ni Alloy Powder is Fe by weight percent meter: Ni 31%, Cr 30%, C 1%, Mo 4.5%, B 2.5%, Si 5%, W 2% and surplus, mixes composition.
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| CN105598649A (en) * | 2016-03-02 | 2016-05-25 | 华北水利水电大学 | Method for strengthening surface of metal turbine runner through iron-based amorphous alloy stick |
| CN105598655A (en) * | 2016-03-02 | 2016-05-25 | 华北水利水电大学 | Method for strengthening surface of metal turbine runner blade through combination of electric spark deposition and welding |
| CN106002080A (en) * | 2016-06-23 | 2016-10-12 | 中国人民解放军第五七九工厂 | Method for repairing abraded end face of arrester |
| CN106238472A (en) * | 2016-08-22 | 2016-12-21 | 合肥东方节能科技股份有限公司 | A kind of rolling guide wheel compound based on cladding coating and preparation method thereof |
| CN106756742A (en) * | 2016-12-05 | 2017-05-31 | 哈尔滨理工大学 | A kind of electric spark deposition method for metal roller surface peening coating |
| CN107002215A (en) * | 2014-10-31 | 2017-08-01 | 东华隆株式会社 | Spraying plating powder, spraying plating epithelium, epithelium and bath of molten metal central roll |
| CN107398478A (en) * | 2017-06-29 | 2017-11-28 | 太仓市钧胜轧辊有限公司 | A kind of high temperature resistant shock resistance composite roll |
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| CN108048834A (en) * | 2017-10-18 | 2018-05-18 | 宁国市开源电力耐磨材料有限公司 | A kind of crust breaking hammer plasma melting coating process |
| CN110158017A (en) * | 2019-05-22 | 2019-08-23 | 马鞍山市恒泰重工机械有限公司 | It is a kind of with fusion, thermal boundary, hard three-decker metallurgy roller surface covering |
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| CN107002215B (en) * | 2014-10-31 | 2019-12-31 | 东华隆株式会社 | Powder for thermal spraying, thermal spraying coating film, and molten metal bath roll |
| CN105598655A (en) * | 2016-03-02 | 2016-05-25 | 华北水利水电大学 | Method for strengthening surface of metal turbine runner blade through combination of electric spark deposition and welding |
| CN105598649A (en) * | 2016-03-02 | 2016-05-25 | 华北水利水电大学 | Method for strengthening surface of metal turbine runner through iron-based amorphous alloy stick |
| CN106002080A (en) * | 2016-06-23 | 2016-10-12 | 中国人民解放军第五七九工厂 | Method for repairing abraded end face of arrester |
| CN106238472A (en) * | 2016-08-22 | 2016-12-21 | 合肥东方节能科技股份有限公司 | A kind of rolling guide wheel compound based on cladding coating and preparation method thereof |
| CN106238472B (en) * | 2016-08-22 | 2018-01-05 | 合肥东方节能科技股份有限公司 | A kind of rolling guide wheel compound based on cladding coating and preparation method thereof |
| CN106756742B (en) * | 2016-12-05 | 2018-12-21 | 哈尔滨理工大学 | A kind of electric spark deposition method for metal roller surface peening coating |
| CN106756742A (en) * | 2016-12-05 | 2017-05-31 | 哈尔滨理工大学 | A kind of electric spark deposition method for metal roller surface peening coating |
| CN107398478A (en) * | 2017-06-29 | 2017-11-28 | 太仓市钧胜轧辊有限公司 | A kind of high temperature resistant shock resistance composite roll |
| CN108048834A (en) * | 2017-10-18 | 2018-05-18 | 宁国市开源电力耐磨材料有限公司 | A kind of crust breaking hammer plasma melting coating process |
| CN107868956A (en) * | 2017-11-21 | 2018-04-03 | 江苏雨燕模业科技有限公司 | A kind of anticorrosive wear-resistant process on automobile die casting surface |
| CN110158017A (en) * | 2019-05-22 | 2019-08-23 | 马鞍山市恒泰重工机械有限公司 | It is a kind of with fusion, thermal boundary, hard three-decker metallurgy roller surface covering |
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|---|---|
| CN103805934B (en) | 2016-01-06 |
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