CN103805934B - A kind of electric spark deposition strengthens the method on metal roller surface in conjunction with plasma cladding - Google Patents
A kind of electric spark deposition strengthens the method on metal roller surface in conjunction with plasma cladding Download PDFInfo
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- CN103805934B CN103805934B CN201410078306.9A CN201410078306A CN103805934B CN 103805934 B CN103805934 B CN 103805934B CN 201410078306 A CN201410078306 A CN 201410078306A CN 103805934 B CN103805934 B CN 103805934B
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Abstract
The present invention relates to the method strengthening metal roller surface with electric spark deposition in conjunction with plasma cladding, electric spark deposition is carried out in conjunction with plasma cladding process to metal roller, effectively can solve the hardness on the surface of roll, the performance such as wear resistance and shock-resistance, extend the problem in the work-ing life of metal roller, method is, with non-oxidizing plasma beam powdered alloy cladding on roller surface, form molten alloy coating, and then with electric spark deposition WC ceramic hard alloy on the basis of plasma cladding coating, form the compound coating of electric spark deposition in conjunction with plasma cladding, the present invention is simple and practical, electric spark deposition is combined firmly in conjunction with plasma cladding compound coating with matrix, coat-thickness is large, make roller surface hardness high, compactness is good, thermotolerance and wear resisting property good, long service life, namely compound coating has played that Fe-Ni Alloy Powder is cheap, coat-thickness is large, wear-resistant etch resistant properties is good, and hardness strength is high, antiwear heat resisting excellent performance.
Description
Technical field
The present invention relates to metal roller, particularly a kind of electric spark deposition strengthens the method on metal roller surface in conjunction with plasma cladding.
Background technology
In iron and steel metallurgy industry, along with China has become production country maximum in the world, 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 general very severe, and it will bear very complicated repeated load and impact, and the working conditions of rapid heat cycle, except requiring that it has except enough obdurabilities, also requires that it has higher wear resistance, thermotolerance and shock resistance.Therefore, improve the hardness of roller surface, the abrasion loss of work roll cooling can be reduced, adopt roller surface repair and intensify technology to improve roller surface hardness, become the main development direction and 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, directly install and use after machine-shaping or install and use after Surface hardening treatment, the method for roller surface hardening mainly contains 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.Laser surface hardening hardened layer and facility investment is 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 hot rolling be used for; Surface overlaying high-abrasive material cost is high, and there is the problem of surface working difficulty; Thermal spraying on surface pre-treatment generally adopts sandblasting, has environmental pollution, coating processing difficulties, and it is poor that coating is combined with matrix, and coating fatiguability peels off; Large-scale laser required for 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 processing metal roller surface, 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 object of the present invention is just to provide a kind of electric spark deposition strengthens metal roller surface method in conjunction with plasma cladding, electric spark deposition is carried out in conjunction with plasma cladding process to metal roller, effectively can solve the performances such as the hardness on the surface of roll, wear resistance and shock-resistance, extend the problem in 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 with electric spark deposition WC ceramic hard alloy on the basis of plasma cladding coating, form the compound coating of electric spark deposition in conjunction with plasma cladding, step is:
(1), prepare Fe-Ni Alloy Powder, this powdered alloy is by by weight percentage: Ni31 ~ 32%, Cr26 ~ 30%, C1 ~ 2%, Mo3 ~ 4.5%, B2.5 ~ 3%, Si3.5 ~ 5%, W2 ~ 4.5% and surplus are the powder of Fe, mix composition;
(2) plasma cladding wearable device (known common equipment, is adopted, as Qingdao HaiNa Plasma Science Co., Ltd, or Henan IGOOD Wear-resisting Technology Co., Ltd.) breaker roll surface cladding FeNi powders last 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, the worktable opening plasma cladding wearable device runs, plasmatorch is made to move on to above roll treatment sites, open plasmatorch shielding gas argon gas and the power supply starting the arc, with the processing parameter provided in step (2), by the conventional practices of plasma cladding wearable device, plasma beam cladding is carried out on breaker roll surface, at high temperature 10000-16000 DEG C of direct current plasma line, the Fe-Ni Alloy Powder configured in step (1) is synchronously sent in the plasma beam of plasmatorch, roller surface forms the molten bath with beam diameter adjoining dimensions fast successively, powder is through rapid heating, in fusing or semi-molten state and molten pool metal mixing diffusion reaction, along with the movement of plasma beam, alloy pool quick solidification, formation and matrix are the plasma cladding alloy coat of metallurgical binding,
(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 electric spark deposition equipment (known common equipment again, DZS-4000 type electric spark deposition equipment as Beijing absolute sincerity letter power technology development company or agrotechnique institute of Chinese science research institute produce), by electrode materials WC or TiC Wimet electrode bar, as work positive electrode, the roll made it in argon gas and be deposited is done to produce spark discharge between negative electrode, directly utilize the energy of spark discharge, 10
-5~ 10
-6the position that in s, electrode contacts with roll (workpiece) reaches 10000 ~ 24500 DEG C, electrode materials is transferred to by the alloy coat of plasma cladding process surface, 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 is 1-4mm through electric spark deposition in conjunction with coat-thickness after plasma cladding.
The present invention is simple and practical, and the electric spark deposition that the present invention is formed is combined firmly in conjunction with plasma cladding compound coating with matrix, coat-thickness greatly, make that roller surface hardness is high, compactness good, thermotolerance and wear resisting property good, long service life; Namely compound coating has played that Fe-Ni Alloy Powder is cheap, coat-thickness is large, wear-resistant etch resistant properties is good, and the hardness strength having played again electric spark deposition ceramic hard alloy is high, the Comprehensive Characteristics of antiwear heat resisting excellent performance.Roll carries out the very large in iron and steel metallurgical industry market potential of surface metallurgic process with electric spark deposition in conjunction with plasma cladding method.
Accompanying drawing explanation
Fig. 1 is metal roller structural representation (partly cut-away) of the present invention.
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.
Embodiment 1
The present invention, in concrete enforcement, is realized by following steps:
(1), prepare Fe-Ni Alloy Powder, this powdered alloy is by by weight percentage: Ni31%, Cr28%, C1.5%, Mo4%, B2.8%, Si4%, W3% and surplus are the powder of Fe, mix composition, and granularity is 106 ~ 180mm;
(2) plasma cladding wearable device breaker roll surface cladding FeNi powders last layer, is adopted, 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 FeNi powders last layer 2 is, the worktable opening plasma cladding wearable device runs, plasmatorch is made to move on to above roll treatment sites, open plasmatorch shielding gas argon gas and the power supply starting the arc, with the processing parameter provided in step (2), by the conventional practices of plasma cladding wearable device, plasma beam cladding is carried out on breaker roll surface, at high temperature 10000-16000 DEG C of direct current plasma line, the Fe-Ni Alloy Powder configured in step (1) is synchronously sent in the plasma beam of plasmatorch, roller surface forms the molten bath with beam diameter adjoining dimensions fast successively, powder is through rapid heating, in fusing or semi-molten state and molten pool metal mixing diffusion reaction, along with the movement of plasma beam, alloy pool quick solidification, formation and matrix are the plasma cladding alloy coat of metallurgical binding,
(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 DZS-4000 type electric spark deposition equipment again, by electrode materials WC or TiC Wimet electrode bar, as work positive electrode, the roll making it in argon gas and be deposited is done to produce spark discharge between negative electrode, directly utilize the energy of spark discharge, 10
-5~ 10
-6the position that in s, electrode contacts with roll (workpiece) reaches 10000 ~ 24500 DEG C, electrode materials is transferred to by the alloy coat of plasma cladding process surface, 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 is 1-4mm through electric spark deposition in conjunction with coat-thickness after plasma cladding.
Embodiment 2
In specific embodiment of the invention, described Fe-Ni Alloy Powder also can adopt weight percent meter: Ni32%, Cr26%, C2%, Mo3%, B3%, Si3.5%, W4.5% and surplus are the powder of Fe, mix composition, the other the same as in Example 1.
Embodiment 3
In specific embodiment of the invention, described Fe-Ni Alloy Powder also can adopt weight percent meter: Ni31%, Cr30%, C1%, Mo4.5%, B2.5%, Si5%, W2% and surplus are the powder of Fe, mix composition, the other the same as in Example 1.
The present invention is through experiment and test, and occur a large amount of nano amorphous microcrystal grain in coating, coating density is high; The metallurgical binding that in plasma cladding 16000 DEG C and electric spark deposition, the high temperature of 25000 DEG C makes compound coating and matrix create coating can not to come off; The surface hardness of coating can reach 1707.6HV ~ 2084.1HV, and the hardness of matrix is 352.1HV, 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 Advantageous Effects:
1, the present invention adopts metal roller to be process cladding object; the high-bond, high rigidity, high compactness, high heat resistance etc. that can obtain high surfaces planeness in the position easy to wear of part or working position can freely control the alloy hardening layer of cladding; the thickness obtaining 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.Which improves the wear-and corrosion-resistant impact resistance of metal roller material surface, and then improve the work-ing life of roll.
2, the present invention makes in the electrical spark region, top layer of compound coating, define the high rigidity non-equilibrium alloy tissue contained, containing 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 makes to have high rigidity, high strength, the powdered alloy of high-wearing feature and the cladding of ceramic hard alloy on the surface of metal roller material by the method for high-energy beam on metal roller, define the composite alloy layer of one deck and matrix metallurgical binding, wear-resistant, shock-resistant, high temperature resistant, corrosion-resistant.Because metallurgical bath single in cladding deposition process is on the roll mother metal of infinitely-great cold conditions, so the speed of cooling in molten bath is very large, with regard to whole roll, be still in normal temperature state or temperature rise lower, roll can not be annealed or thermal distortion.
4, on metal roller, the thickness of compound coating after cladding powdered alloy and ceramic deposition Wimet, quality are relevant with cladding deposition process parameters voltage, electric current, frequency and speed etc. with working efficiency, therefore by obtaining different technological effects to the regulable control of processing parameter.Method is simple, and easy to operate, good product quality, has very strong actual application value, and can be widely used in iron and steel metallurgical industry, economic and social benefit is huge.
Claims (2)
1. strengthen the method on metal roller surface with electric spark deposition in conjunction with plasma cladding, it is characterized in that, realized by following steps:
(1), prepare Fe-Ni Alloy Powder, this powdered alloy is by by weight percentage: Ni31%, Cr28%, C1.5%, Mo4%, B2.8%, Si4%, W3% and surplus are the powder of Fe, mix composition;
(2) plasma cladding wearable device breaker roll surface cladding FeNi powders last layer, is adopted, 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 FeNi powders last layer is, the worktable opening plasma cladding wearable device runs, plasmatorch is made to move on to above roll treatment sites, open plasmatorch shielding gas argon gas and the power supply starting the arc, with the processing parameter provided in step (2), by the conventional practices of plasma cladding wearable device, plasma beam cladding is carried out on breaker roll surface, at high temperature 10000-16000 DEG C of direct current plasma line, the Fe-Ni Alloy Powder configured in step (1) is synchronously sent in the plasma beam of plasmatorch, roller surface forms the molten bath with beam diameter adjoining dimensions fast successively, powder is through rapid heating, in fusing or semi-molten state and molten pool metal mixing diffusion reaction, along with the movement of plasma beam, alloy pool quick solidification, formation and matrix are the plasma cladding alloy coat of metallurgical binding,
(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 DZS-4000 type electric spark deposition equipment again, by electrode materials WC or TiC Wimet electrode bar, as work positive electrode, the roll making it in argon gas and be deposited is done to produce spark discharge between negative electrode, directly utilize the energy of spark discharge, 10
-5~ 10
-6in s, the position of electrode and roll contact reaches 10000 ~ 24500 DEG C, electrode materials is transferred to by the alloy coat of plasma cladding process surface, 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 is 1-4mm through electric spark deposition in conjunction with coat-thickness after plasma cladding.
2. strengthen the method on metal roller surface with electric spark deposition in conjunction with plasma cladding, it is characterized in that, realized by following steps:
(1), prepare Fe-Ni Alloy Powder, this powdered alloy is by weight percentage: Ni31%, Cr30%, C1%, Mo4.5%, B2.5%, Si5%, W2% and surplus are the powder of Fe, mix composition;
(2) plasma cladding wearable device breaker roll surface cladding FeNi powders last layer, is adopted, 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 FeNi powders last layer is, the worktable opening plasma cladding wearable device runs, plasmatorch is made to move on to above roll treatment sites, open plasmatorch shielding gas argon gas and the power supply starting the arc, with the processing parameter provided in step (2), by the conventional practices of plasma cladding wearable device, plasma beam cladding is carried out on breaker roll surface, at high temperature 10000-16000 DEG C of direct current plasma line, the Fe-Ni Alloy Powder configured in step (1) is synchronously sent in the plasma beam of plasmatorch, roller surface forms the molten bath with beam diameter adjoining dimensions fast successively, powder is through rapid heating, in fusing or semi-molten state and molten pool metal mixing diffusion reaction, along with the movement of plasma beam, alloy pool quick solidification, formation and matrix are the plasma cladding alloy coat of metallurgical binding,
(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 DZS-4000 type electric spark deposition equipment again, by electrode materials WC or TiC Wimet electrode bar, as work positive electrode, the roll making it in argon gas and be deposited is done to produce spark discharge between negative electrode, directly utilize the energy of spark discharge, 10
-5~ 10
-6in s, the position of electrode and roll contact reaches 10000 ~ 24500 DEG C, electrode materials is transferred to by the alloy coat of plasma cladding process surface, 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 is 1-4mm through electric spark deposition in conjunction with coat-thickness after plasma cladding.
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