CN1609256A - Powder metallurgy steel rolling guide roll and producing method thereof - Google Patents
Powder metallurgy steel rolling guide roll and producing method thereof Download PDFInfo
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Abstract
The present invention discloses one kind of steel rolling guide and guard roller for powder metallurgy and its making process. By means of material optimization, powder metallurgy and liquid phase sintering, steel rolling guide and guard roller with excellent performance is obtained. The powdered material includes Cr 8-20 wt%, Mo 0.8-3.6 wt%, W 0.5-2 wt%, Ni+Co+Cu 3.5-7 wt%, V 0.3-1.2 wt%, BN 0.1-0.5 wt%, C1.8-2.5 wt%, amide wax powder 0.5 wt% and surfactant 0.3-1 wt% except Fe. The making process includes the following steps: compounding material and mixing, pressing to form, sintering, heat treatment and machining. The guide and guard roller may be used continuously for 3-5 shifts to raise the steel rolling efficiency, and the used roller may be reused after repair and trimming.
Description
Technical field the present invention relates to the method for a kind of powder metallurgy steel rolling guide roller and manufacturing thereof.
Background technology is along with the technical progress of ferrous metallurgy equipment, and the roller steel rolling guide roller is used widely.Because the guide roll working conditions is abominable, must bear surperficial high temperature, high-speed friction wearing and tearing, stocking impact, cold and hot fatigue stress effect, often lost efficacy because of reasons such as wearing and tearing, cracking, steel bondings.At present, steel rolling guide roller mainly adopts spheroidal graphite cast iron, high chromium cast iron material, Cr
12MoV alloy steel material, Hardmetal materials and composite overlaying material.Situation about using from the scene, there are problems in these materials, influence the guide roll result of use.Spheroidal graphite cast iron is the material of selecting for use the earliest, and its wear resistance and thermal-shock resistance all can not meet the demands.High chromium cast iron material causes brittle cracking and processing difficulties along with the increase of chromium content, tendency that the alloying element segregation is grown up are obvious.Cr
12The MoV alloy steel material is easy to generate the annealing phenomenon under the pyritous working condition, lost wear resistance.Each order of classes or grades at school need be shut down the replacing guide roll, wastes a large amount of production times.Hardmetal materials has outstanding wear resistance, but cost an arm and a leg, fragility more greatly, particularly cracking back will make rolls damage in case be brought into roll, so be difficult to popularization.The composite overlaying material is subjected to the inefficiency that influences of production technique, has defective again inevitably, easily steel bonding or scuffing steel.Consider that according to composite factor people use Cr more
12The MoV alloy steel material, the method for employing per tour roll change is in the hope of producing stable carrying out.
In recent years, the research of high alloy powder metallurgy liquid phase sintered material caused people's attention, had done a large amount of work both at home and abroad.Although the research of this respect is still very unripe, some achievement is applied on I. C. engine exhaust valve seat, rocking arm are inserted.Relevant report is not seen in this class material application on rolling machinery as yet.
Summary of the invention the invention provides a kind of powder metallurgy steel rolled guiding roller and manufacture method thereof.By material optimization and powder metallurgy liquid phase sintering technology, obtained the steel rolling guide roller of excellent property.
Powder metallurgy steel rolled guiding roller, it is characterized in that the powder stock composition of leading a roller is: Cr 8～20%; Mo 0.8～3.6%; W 0.5～2%; Ni, Co, Cu 3.5～7%; V 0.3～1.2%; BN 0.1～0.5%; C 1.8～2.5%; Amide waxe powder 0.5%; Tensio-active agent 0.3～1%; Surplus is an iron powder;
Powder metallurgy steel rolled guiding roller physicals: density of material ρ 7.5～7.8g/cm
3Hardness HRC50～63; Bending strength 1000～1300Mpa; Radial crushing strength 1500～1800Mpa; Impelling strength α
K3.9～5J/cm
2Tensile strength sigma
b800～1200MPa.
The manufacture method of powder metallurgy steel rolled guiding roller is characterized in that this method may further comprise the steps:
A, batching and batch mixing
Adopt water atomization Fe-Ni-Mo to give alloy iron powder and reduced iron powder, it is 50～95% that the alloy iron powder content is given in water atomization, and reduced iron powder content is 5～50%, and chromium, molybdenum add with the form of high carbon ferro-chrome alloy, Ferromolybdenum Powder, regulate content; Ni, Cu, Co are electrolytic powder, and-200 orders, C are oildag, and W, V add to give the powdered alloy form, and six side BN powder sizes are-1 μ m;
Get Fe-Ni-Mo and give the alloy iron powder, its powder of 50% is put into mixer, get Fe-Cr powder, all the other various powder and stearates, add mixer, the Fe-Ni-Mo of remainder is given alloy iron powder adding mixer, mixed 1.5～3 hours, get reduced iron powder, add tensio-active agent, small-sized mixer mixed 1.5～3 hours; The reduced iron powder that is mixed with tensio-active agent is added mixer, remix 1.5～3 hours, discharging;
B, compression moulding
The die design parameter: retarded elasticity 0.03%～0.1, shrinkage coefficient: radially 3.0～4.0%, axial 4.0～4.5%, pressed compact design density: 6.0～6.6g/cm
3
Compacting: pressing pressure 500～750MPa, two-way compacting, stopper is spacing, 20～30 seconds dwell times;
C, sintering
Sintering adopts pure hydrogen sintering process or vacuum sintering technology, pure hydrogen sintering process: 1230 ℃～1300 ± 3 ℃ of sintering temperatures, soaking time 1～1.5 hour, dew point of hydrogen-50 ℃, hydrogen flowing quantity 5m
3/ hour, flame height 80～100cm pushes away 15～20 minutes/boat of boat speed, cooling water flow 2m
3/ h, filler are the mixture of 1～3% carbon black and aluminum oxide, and agglomerating plant is the push-down powder metallurgy sintering furnace;
Vacuum sintering technology: 1210 ℃～1280 ℃ ± 2 ℃ of sintering temperatures, soaking time 40～90 minutes, vacuum tightness＜5Pa, 100～180 ℃/hour of heat-up rates, 600～650 ℃ are incubated 30～60 minutes, outage cooling after sintering is finished, 600～700 ℃ feed the nitrogen cooling, tapping temperature＜70 ℃;
D, thermal treatment
Conventional Heat Treatment or vacuum heat treatment are adopted in thermal treatment, Conventional Heat Treatment: Equipment for Heating Processing is retort furnace or pit furnace through encapsulation process, protective atmosphere flow 〉=2m/h, safeguard malleation in the stove, 860～1020 ℃ of quenching temperatures, heat-up rate＜100 ℃, soaking time 40～180 minutes, the air cooling of coming out of the stove, 200～600 ℃ of tempering 1～2 hour;
Vacuum heat treatment: Equipment for Heating Processing is a vacuum heat treatment furnace, vacuum tightness＜10Pa, 80～100 ℃/hour of heat-up rates, 860～1020 ℃ of quenching temperatures, soaking time 60～180 minutes, oil quenching in the stove, 280～600 ℃ of tempering 2～3 hours;
E, mechanical workout
Equipment is the accurate digital control lathe, engineering ceramics blade, turning speed 60～200m/min, the finish turning depth of cut 0.01～0.2mm/r.
The present invention compared with prior art, its outstanding advantage and beneficial effect are embodied in: adopt the powder metallurgical technique technology, the steel rolling guide roller of the powder metallurgy with good over-all properties is provided.Its metallographic structure is alloy carbide, tempered martensite and a spot of residual austenite, crystal grain is tiny evenly, alloy-free element segregation and thick tissue form, therefore have anti-high-speed friction, polishing machine, can bear surperficial high temperature action, do not produce the annealing phenomenon, owing to added the self-lubricating material constituent element, not only have good wear, and non-stick steel.By the liquid phase sintering technology method, improved the density and the mechanical property of goods.The spherical voids that has a spot of microscopic closed in the matrix of goods can play the effect of rejected heat stress, has improved the ability of anti-hot and cold fatigue stress.
Adopt punching block compression moulding, can accurate calculation, the control sintering shrinks, near final morpheme size, machining amount is less to greatest extent for goods, and material use efficiency can reach more than 95%, makes manufacturing cost reduce.The powder metallurgy guide roll can use 3～5 order of classes or grades at school continuously, has reduced the number of times of changing guide roll, has improved the steel rolling working efficiency.Can repeatedly use through after the reconditioning.
Embodiment
Embodiment 1 powder metallurgy steel rolled guiding roller powder stock composition is: Cr 15%; Mo 1.2%; W 0.5%; Ni, Co, Cu 3.5%; V 0.5%; BN 0.3%; C 2.0%; Amide waxe powder 0.5%; Tensio-active agent 0.7%; Surplus is an iron powder.
Powder metallurgy steel rolled guiding roller manufacture method operation steps: 1, taking by weighing total amount is 10 kilograms of powder that prepare by the above-mentioned raw materials composition, adds efficient mixer successively, mixes 2 hours; Mixed 2 hours of this property paraffin of reduced iron powder adding 0.7% and the acetone soln of polyoxyethylene glycol add efficient bipyramid formula mixer mixer then, mix 2 hours, finish batch mixing.
2, by 10 on inspecting standard compacting sample, simplified 10 of the cylinder of φ 60 * φ 30 * H60, pressing force 680Mpa, pressed density 6.5g/cm
3, pressing device is a four-column type powder metallurgy hydropress.
3, the blank after the compacting carries out sintering, 1270 ℃ ± 3 ℃ of sintering temperatures; Soaking time 1.5 hours; Dew point of hydrogen-50 ℃; Hydrogen flowing quantity 5m
3/ hour; Cooling water flow 2m
3/ h; Filler is the mixture of 1.5% carbon black and aluminum oxide, and agglomerating plant is the push-down powder metallurgy sintering furnace.
4, the blank behind the sintering is heat-treated, and Equipment for Heating Processing is the retort furnace through encapsulation process.Adopt nitrogen+10% hydrogen shield, small amounts of carbon black landfill or dropping kerosene, protective atmosphere flow 〉=2m
3/ h is to safeguard malleation in the stove.940 ℃ of quenching temperatures, 80 ℃ of heat-up rates, soaking time 120 minutes, the air cooling of coming out of the stove.260 ℃ of tempering, 2 hours.
5, the blank after the thermal treatment carries out mechanical workout, and to the coupon ground finish, cylindrical tube finish turning, turning equipment are precise numerical control machine, engineering ceramics blade, turning speed 200m/min, finish turning depth of cut 0.02mm.
6, establishing criteria detects, and powder metallurgy steel rolled guiding roller physicals is: density of material ρ 7.56g/cm
3Hardness HRC56; Bending strength 1050Mpa; Radial crushing strength 1520Mpa; Impelling strength α K4.0J/cm
2Tensile strength sigma
b820MPa.
Embodiment 2 powder metallurgy steel rolled guiding roller powder stock compositions are with embodiment 1.
Powder metallurgy steel rolled guiding roller manufacture method operation steps: 1, method for mixing and drawing method mix 180 kilograms of compounds of system with embodiment 1.Suppress 120 guide roll blanks.
2, adopt vacuum sintering technology, 1240 ℃ ± 2 ℃ of sintering temperatures; Soaking time 50 minutes; Vacuum tightness 3Pa; 150 ℃/hour of heat-up rates; 600 ℃ are incubated 30 minutes; Outage cooling after sintering is finished, 600 ℃ feed the circulating nitrogen gas cooling, and room temperature is come out of the stove.
3, Equipment for Heating Processing is a vacuum heat treatment furnace, vacuum tightness 8Pa; 80 ℃/hour of heat-up rates; 920 ℃ of quenching temperatures; Soaking time 120 minutes; Oil quenching in the stove; 300 ℃ of tempering, 2 hours.
4, mechanical workout is identical with embodiment 1 with method for testing performance, and detected result is: density p 7.68g/cm
3Hardness HRC60; Radial crushing strength 1600Mpa; Bending strength 〉=1200Mpa; Impelling strength α
K4.5J/cm
2Tensile strength sigma
b1000MPa.
These goods are used for φ 20 round rolling productions, no cracking phenomena, and 0.6/ class of wear rate can use 3 order of classes or grades at school continuously.Still can use 3～5 times after the reconditioning.
Claims (2)
1, a kind of powder metallurgy steel rolled guiding roller, it is characterized in that the powder stock composition of leading a roller is: Cr 8～20%; Mo 0.8～3.6%; W 0.5～2%; Ni, Co, Cu 3.5～7%; V 0.3～1.2%; BN 0.1～0.5%; C 1.8～2.5%; Amide waxe powder 0.5%; Tensio-active agent 0.3～1%; Surplus is an iron powder;
Powder metallurgy steel rolled guiding roller physicals: density of material ρ 7.5～7.8g/cm
3Hardness HRC50～63; Bending strength 1000～1300Mpa; Radial crushing strength 1500～1800Mpa; Impelling strength α
K3.9～5J/cm
2Tensile strength sigma
b800～1200MPa.
2, the manufacture method of the described powder metallurgy steel rolled guiding of claim 1 roller is characterized in that this method may further comprise the steps:
A, batching and batch mixing
Adopt water atomization Fe-Ni-Mo to give alloy iron powder and reduced iron powder, it is 50～95% that the alloy iron powder content is given in water atomization, and reduced iron powder content is 5～50%, and chromium, molybdenum add with the form of high carbon ferro-chrome alloy, Ferromolybdenum Powder, regulate content; Ni, Cu, Co are electrolytic powder, and-200 orders, C are oildag, and W, V add to give the powdered alloy form, and six side BN powder sizes are-1 μ m;
Get Fe-Ni-Mo and give the alloy iron powder, its powder of 50% is put into mixer, get Fe-Cr powder, all the other various powder and stearates, add mixer, the Fe-Ni-Mo of remainder is given alloy iron powder adding mixer, mixed 1.5～3 hours, get reduced iron powder, add tensio-active agent, small-sized mixer mixed 1.5～3 hours; The reduced iron powder that is mixed with tensio-active agent is added mixer, remix 1.5～3 hours, discharging;
B, compression moulding
The die design parameter: retarded elasticity 0.03%～0.1, shrinkage coefficient: radially 3.0～4.0%, axial 4.0～4.5%, pressed compact design density: 6.0～6.6g/cm
3
Compacting: pressing pressure 500～750MPa, two-way compacting, stopper is spacing, 20～30 seconds dwell times;
C, sintering
Sintering adopts pure hydrogen sintering process or vacuum sintering technology, pure hydrogen sintering process: 1230 ℃～1300 ± 3 ℃ of sintering temperatures, soaking time 1～1.5 hour, dew point of hydrogen-50 ℃, hydrogen flowing quantity 5m
3/ hour, flame height 80～100cm pushes away 15～20 minutes/boat of boat speed, cooling water flow 2m
3/ h, filler are the mixture of 1～3% carbon black and aluminum oxide, and agglomerating plant is the push-down powder metallurgy sintering furnace;
Vacuum sintering technology: 1210 ℃～1280 ℃ ± 2 ℃ of sintering temperatures, soaking time 40～90 minutes, vacuum tightness＜5Pa, 100～180 ℃/hour of heat-up rates, 600～650 ℃ are incubated 30～60 minutes, outage cooling after sintering is finished, 600～700 ℃ feed the nitrogen cooling, tapping temperature＜70 ℃;
D, thermal treatment
Conventional Heat Treatment or vacuum heat treatment are adopted in thermal treatment, Conventional Heat Treatment: Equipment for Heating Processing is retort furnace or pit furnace through encapsulation process, protective atmosphere flow 〉=2m/h, safeguard malleation in the stove, 860～1020 ℃ of quenching temperatures, heat-up rate＜100 ℃, soaking time 40～180 minutes, the air cooling of coming out of the stove, 200～600 ℃ of tempering 1～2 hour;
Vacuum heat treatment: Equipment for Heating Processing is a vacuum heat treatment furnace, vacuum tightness＜10Pa, 80～100 ℃/hour of heat-up rates, 860～1020 ℃ of quenching temperatures, soaking time 60～180 minutes, oil quenching in the stove, 280～600 ℃ of tempering 2～3 hours;
E, mechanical workout
Equipment is the accurate digital control lathe, engineering ceramics blade, turning speed 60～200m/min, the finish turning depth of cut 0.01～0.2mm/r.
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| CN108660378A (en) * | 2018-06-15 | 2018-10-16 | 河南科技大学 | A kind of high nitrogen alloy steel and preparation method thereof |
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- 2003-10-17 CN CN 200310104870 patent/CN1609256A/en active Pending
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| CN102251085A (en) * | 2011-07-18 | 2011-11-23 | 哈尔滨工业大学（威海） | Plastic processing method for powder metallurgy high-speed steel |
| CN102251085B (en) * | 2011-07-18 | 2013-02-13 | 哈尔滨工业大学（威海） | Plastic processing method for powder metallurgy high-speed steel |
| CN103161915A (en) * | 2011-12-08 | 2013-06-19 | 现代自动车株式会社 | Scissors gear structure and manufacturing method thereof |
| CN102975423A (en) * | 2012-11-22 | 2013-03-20 | 宁波市群星粉末冶金有限公司 | Powder metallurgy brake caliper and production method thereof |
| CN102974824A (en) * | 2012-11-22 | 2013-03-20 | 宁波得利时泵业有限公司 | Method for preparing stator and rotor of homogeneous mixing pump |
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| CN103469047B (en) * | 2013-09-17 | 2015-10-28 | 北京科技大学 | A kind of method for preparing powder metallurgy of high anti-corrosion weathering steel |
| CN103628371B (en) * | 2013-12-11 | 2016-03-09 | 上海瑞纽机械股份有限公司 | A kind of manufacture method of hydraulic track-switching device base plate |
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