CN101760603A - Manufacture method of composite milling roller with good roller surface rigidity uniformity - Google Patents
Manufacture method of composite milling roller with good roller surface rigidity uniformity Download PDFInfo
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- CN101760603A CN101760603A CN201010033822A CN201010033822A CN101760603A CN 101760603 A CN101760603 A CN 101760603A CN 201010033822 A CN201010033822 A CN 201010033822A CN 201010033822 A CN201010033822 A CN 201010033822A CN 101760603 A CN101760603 A CN 101760603A
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Abstract
The invention discloses a manufacture method of a composite milling roller with good roller surface rigidity uniformity, which is characterized in that the method comprises the following steps: firstly, heating the composite milling roller to a temperature 80 to 150 DEG C higher than the critical point AC1 in a heating furnace; placing the composite milling roller into a cold controller after heat preservation; firstly, spraying and cooling the composite milling roller for 5 to 15 minutes; then, cooling the composite milling roller for 20 to 60 minutes by gas; finally, cooling the composite milling roller by air until the roller surface temperature is lower than 300 DEG C; putting the composite milling roller into a furnace for tempering treatment at the tempering heating temperature between 450 and 580 DEG C; cooling the furnace to the temperature lower than 200 DEG C after heat preservation; and cooling the composite milling roller to the room temperature by air. The rigidity of the rolling surface of the composite milling roller of the invention is uniform, the service life is obviously prolonged, and the invention has good economic benefits when being popularized and applied.
Description
Technical field
The present invention is a kind of composite roll manufacture method, and composite roll and manufacture method thereof that particularly a kind of roll surface uniformity of hardness is good belong to roll manufacturing technology field.
Background technology
Modern metallurgical industry production is that centralized procurement ore deposit, ore dressing, sintering, ironmaking, steel-making and steel rolling are the systems engineering of one, and steel rolling is last link of this systems engineering, and most metallurgic products will just can come into the market through the operation of rolling.And roll is a most important means of production in the operation of rolling, and the quality quality of roll directly affects the output and the quality of metallurgic product, and the height of the roll manufacturing technology of a country has directly reflected the height of this state's metallurgical industry level.Modern metallurgical roller has experienced several significant process from the development of material and manufacturing process: roll material develops into composite roll with high Minvar, the rich chromium cast iron casting high speed steel until recent development gradually from single white cast iron, spheroidal graphite cast iron, cast steel; It (is a kind of material of roll roll surface that manufacturing process also develops into composite casting technology from common integral casting process, the another kind of material of roller core, metallurgical binding between the two), composite casting technology develops into the so far state-of-the-art continuous casting composite casting of centrifugal casting (being the CPC method) roll manufacturing technology from static casting method (being press over system or irrigation).But domestic roll falls behind because of heat treatment technics, and its roll surface hardness ununiformity reaches about 8HSD, than international most advanced level superelevation 4～6HSD, roll surface hardness is inhomogeneous to cause the Roller Machining difficulty, and wear resistance, thermal fatigue resistance, cracking resistance line and resistance to fracture are poor, and roll is short work-ing life.
In order to improve roll roll surface uniformity of hardness, Chinese patent CN2545213 discloses roll curtain-type water ring refrigerating unit, its technical measures: mainly form by water storage storehouse (3), workpiece hole (4) and water jet (5) in water spray ring body (1), water-in (2), the water spray ring body (1), the ring body (1) that it is characterized in that spraying water is divided into water spray ring cowling (6) and water ring lower body (7) two portions, and water spray ring cowling (6) and water ring lower body (7) water jet (5) between the two are the annular slot formula.Advantage of the present utility model be to make its surface cool evenly and hardness quality height, no soft spots, quench thorough, be difficult for producing and be out of shape.But this device structure complexity is directly used in the quench cooled troublesome poeration of composite roll.People such as Guo Feng (Guo Feng; Liu Shiyu; Zhao Xiquan. the improvement of the whole differential heating fog quenching of fluting roll technology. heavy casting and forging; 2002 the 3rd phases: the 22-25 page or leaf) also studied the whole differential heating fog quenching of fluting roll technology; discover; when the fluting roll is sprayed after heating; angle, outer end, both sides collapses the limit; cause scrapping; developed and attach the angle, opposite end and protect, will attach during spraying and be placed on place, body of roll end angle, avoided fog to be directly injected to place, work end angle effectively; prevented that water smoke from collapsing the appearance of limit phenomenon to the cooling of work end angle is too drastic with the end angle, but had the deficiency of troublesome poeration.Chinese invention patent CN 1221036 also discloses a kind of roll, straightening roll method for quenching surface and quenching apparatus.Said quenching apparatus comprises lathe, argon welder, water jet composition, described roll, straightening roll method for quenching surface are, roll, straightening roll rotate with certain circumferential speed, and argon-arc torch with the speed of working good along roll, straightening roll axial motion, water jet is fixed on below the welding torch.The argon arc burning, heat on breaker roll, straightening roll surface, simultaneously roll, the straightening roll water spray Cooling Quenching of water jet to having heated.But this method needs the argon arc burning, and the roller surface temperature homogeneity is relatively poor, and roll roll surface uniformity of hardness is not high yet.
Summary of the invention
The present invention be directed to the deficiency that existing roll heat treatment technics exists, proposed a kind of preparation method who guarantees the uniform roll of roll roll surface hardness.
The present invention improves to form on the basis of existing wear-resistant composite roller.During existing wear-resistant composite roller quenching heat treatment, roll is placed directly in heat treatment furnace internal heating and insulation, with postcooling the time, generally adopt air-cooled, mist is cold or the air cooling mode, to obtain the good martensitic stucture of wear resistance.Adopt air cooling or air-cooled, hardness is low and depth of hardening zone is shallow, causes roll to wear no resistance, and work-ing life is short.And directly adopt mist deepfreeze, roll surface to be prone to crackle, and roll neck hardness is too high, bearing easy to wear in the use, and mist when cold roll neck intensity low, poor toughness, roll is prone to roll breakage accident in using.
The characteristics of the composite roll manufacture method that the roll surface uniformity of hardness is good are that composite roll is after heating and insulation, roll is placed controlled cooling device, and make in the roll process of cooling and rotate with certain speed, simultaneously at roller neck surface coating lagging material, and roll neck places beyond the controlled cooling device, it is good to obtain roll surface hardness height and uniformity of hardness like this, the composite roll that the roll neck obdurability is good.
The present invention can realize by following measure, referring to Fig. 1 composite roll cooling synoptic diagram.
At first with composite roll at the process furnace internal heating to more than the stagnation point AC1 80～150 ℃, be placed in the controlled cooling device (4) after 4-6 hour through insulation, the body of roll (3) is placed in the controlled cooling device (4), roll neck (1) places beyond the controlled cooling device, roll with the speed rotation of 25～35rpm, applies lagging material (2) at roller neck surface simultaneously in process of cooling; Roll is in controlled cooling device (4), and earlier through mist, gas water cooler (5) spray cooling 5～15 minutes, air cooling was 20～60 minutes then, and last air cooling to roll surface temperature is lower than 300 ℃; Go into stove and carry out temper this moment, 450～580 ℃ of tempering Heating temperatures, and air cooling was to room temperature after stove was chilled to temperature to be lower than 200 ℃ after being incubated 6-15 hour.
The thickness of above-mentioned described coating lagging material (2) is 2-4mm.
Above-mentioned described coating lagging material (2) is the lagging material of thermal conductivity less than 0.08 (w/m.k).
Principle of the present invention is as follows:
The present invention at first is heated to roll the stagnation point A of rolling body material
C1More than 80～150 ℃ purpose be to impel the matrix austenitizing, help obtaining in the subsequent cooling process martensitic stucture of high rigidity.Roll is placed in the controlled cooling device through insulation, and makes in the roll process of cooling speed rotation with 25～35rpm, helps the cooling of roll roll surface evenly, and is favourable to the homogeneity that improves roll surface hardness.Simultaneously show the coating lagging material, and roll neck places beyond the controlled cooling device, can guarantee the roll neck cooling slowly, help improving the roll neck obdurability, prevent that roll neck from fracture accident occurring in using at roller neck.
Roll in controlled cooling device, first spray cooling 5～15 minutes, air cooling is 20～60 minutes then.Spray cooling speed is fast, help promoting austenite to martensitic transformation, improve the roll depth of hardening zone, but the spray cooling overlong time, body of roll internal stress is big, easily germinates crackle, therefore, the spray cooling time was controlled at 5～15 minutes, reduces speed of cooling then, adopt air cooling 20～60 minutes.Go into stove when last air cooling to roll surface temperature is lower than 300 ℃ and carry out temper.The tempered purpose is for stabilizing tissue, eliminates stress, and guarantees that roll is safe and reliable.
The present invention compared with prior art has the following advantages:
1, roll roll surface uniformity of hardness of the present invention is good, and the roll surface difference of hardness is less than 2HSD.
2, roller neck intensity height of the present invention, good toughness improve 15～25% than thermal treatment process intensity commonly used, and toughness improves more than 30%.
3, roll long service life of the present invention, prolong 30～50% the work-ing life of identical material roll.
Description of drawings
Fig. 1 is composite roll cooling synoptic diagram
1-roll neck wherein, 2-lagging material, the 3-body of roll, 4-controlled cooling device, 5-mist, gas water cooler
Embodiment
The present invention at first with wear-resistant composite roller at the process furnace internal heating to stagnation point A
C1More than 80～150 ℃, be placed in the controlled cooling device (4) through insulation, and make in the roll process of cooling speed rotation with 25～35rpm, simultaneously at roller neck (1) surface applied lagging material (2), and roll neck (1) places controlled cooling device (4) in addition.Roll is in controlled cooling device (4), use mist, gas water cooler (5) spray cooling 5～15 minutes earlier, air cooling is 20～60 minutes then, go into stove when last air cooling to roll surface temperature is lower than 300 ℃ and carry out temper, 450～580 ℃ of tempering Heating temperatures, air cooling was to room temperature after stove was chilled to temperature and is lower than 200 ℃ after being incubated.
The present invention is described in further detail according to embodiment that technical scheme of the present invention is finished below in conjunction with accompanying drawing and contriver.These embodiment only are preferred embodiments of the present invention, but the present invention is not limited to these embodiment.
Embodiment 1:
With the body of roll (3) is that high-carbon high-high-vanadium high-speed steel, roll neck (1) are the centrifugally cast composite roll of spheroidal graphite cast iron, after annealing and roughing, at the stagnation point A of process furnace internal heating to the high-carbon high-vanadium high-speed steel
C1More than 150 ℃, be placed in the controlled cooling device (4) through being incubated 4 hours, the body of roll (3) places in the controlled cooling device (4), and roll neck (1) places controlled cooling device (4) in addition, and make in the roll process of cooling speed rotation with 35rpm, at roller neck (1) surface applied lagging material (2), its thickness is 2mm simultaneously.Wherein (massfraction %) is the main chemical compositions of high-carbon high-high-vanadium high-speed steel: 1.78C, 4.63V, 5.04Cr, 2.11Nb, 0.57Ni and 4.89Mo.Lagging material (2) is that thermal conductivity is the CaO/SiO of 0.043 (w/m.k)
2Composite roll is in controlled cooling device (4), use cold 5 minutes of mist, gas water cooler (5) spraying mist earlier, air cooling is 60 minutes then, go into stove when last air cooling to roll surface temperature is lower than 300 ℃ and carry out temper, 580 ℃ of tempering Heating temperatures, after being incubated 6 hours, air cooling was to room temperature after stove was chilled to temperature and is lower than 200 ℃.Be refined to specified dimension and precision at last, the measuring roller surface hardness reaches 83.7～85.4HSD, and the roll surface difference of hardness is less than 2HSD.
Embodiment 2:
With the body of roll (3) is that rich chromium cast iron, roll neck (1) are the centrifugally cast composite roll of spheroidal graphite cast iron, after annealing and roughing, at the stagnation point A of process furnace internal heating to rich chromium cast iron
C1More than 80 ℃, be placed in the controlled cooling device (4) through being incubated 6 hours, the body of roll (3) places in the controlled cooling device (4), and roll neck (1) places controlled cooling device (4) in addition, and make in the roll process of cooling speed rotation with 25rpm, at roller neck (1) surface applied lagging material (2), its thickness is 4mm simultaneously.Wherein (massfraction %) is the main chemical compositions of rich chromium cast iron: 2.89C, 18.61Cr, 1.04Ni, 1.88Mo and 0.17Ti.Lagging material (2) is that thermal conductivity is the woven asbesto of 0.069 (w/m.k).Composite roll is in controlled cooling device (4), use cold 15 minutes of mist, gas water cooler (5) spraying mist earlier, air cooling is 20 minutes then, go into stove when last air cooling to roll surface temperature is lower than 300 ℃ and carry out temper, 450 ℃ of tempering Heating temperatures, after being incubated 15 hours, air cooling was to room temperature after stove was chilled to temperature and is lower than 200 ℃.Roll surface hardness reaches 85.2～87.0HSD, and the roll surface difference of hardness is less than 2HSD.
Roll through above-mentioned processing has carried out industrial use examination on mill coil milling train and merchant bar mill, find that roll wear of the present invention is even, and the stocking surface quality is good, and the roll wear resistance is good, long service life.Non-cracking, cracking and peeling phenomenon occurred during roll used.Roll work-ing life, the roll than identical material prolonged 30～50%, used art breading roll of the present invention to have good economic benefits.
Claims (3)
1. the manufacture method of the composite roll that a roll surface uniformity of hardness is good is characterized in that, may further comprise the steps:
At first with composite roll at the process furnace internal heating to more than the stagnation point AC1 80～150 ℃, be placed in the controlled cooling device (4) after 4-6 hour through insulation, the body of roll (3) is placed in the controlled cooling device (4), roll neck (1) places beyond the controlled cooling device, roll with the speed rotation of 25～35rpm, applies lagging material (2) at roller neck surface simultaneously in process of cooling; Roll is in controlled cooling device (4), and earlier through mist, gas water cooler (5) spray cooling 5～15 minutes, air cooling was 20～60 minutes then, and last air cooling to roll surface temperature is lower than 300 ℃; Go into stove and carry out temper this moment, 450～580 ℃ of tempering Heating temperatures, and air cooling was to room temperature after stove was chilled to temperature to be lower than 200 ℃ after being incubated 6-15 hour.
2. by the described method of claim 1, it is characterized in that the thickness of described coating lagging material (2) is 2-4mm.
3. in accordance with the method for claim 1, it is characterized in that described coating lagging material (2) is the lagging material of thermal conductivity less than 0.08 (w/m.k).
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| CN201010033822A CN101760603A (en) | 2010-01-08 | 2010-01-08 | Manufacture method of composite milling roller with good roller surface rigidity uniformity |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102321795A (en) * | 2011-10-17 | 2012-01-18 | 中钢集团邢台机械轧辊有限公司 | Heat treatment method for high ferrochrome roll requiring stepped hardness of roll body |
| CN103572033A (en) * | 2012-08-07 | 2014-02-12 | 上海重型机器厂有限公司 | Thermal treatment method of wide and thick plate supporting roll |
| CN104480290A (en) * | 2014-12-31 | 2015-04-01 | 芜湖金龙模具锻造有限责任公司 | Thermal treatment method for stainless steel plate for automobile sheet metal part |
| CN104531969A (en) * | 2014-12-19 | 2015-04-22 | 芜湖金龙模具锻造有限责任公司 | Heat treatment method for reducing automobile insert deformation |
| CN104593783A (en) * | 2014-12-29 | 2015-05-06 | 芜湖金龙模具锻造有限责任公司 | Heat treatment method capable of reducing out-of-round deformation of large-diameter ring part |
| CN104878174A (en) * | 2014-02-28 | 2015-09-02 | 钢铁研究总院 | Method for controlling heat treatment cooling speed of high temperature alloy product |
| CN106086361A (en) * | 2016-07-25 | 2016-11-09 | 杭州汽轮动力集团有限公司 | A kind of Industrial Steam Turbine Rotors Aided forging piecewise heat treatment method |
| CN107488772A (en) * | 2017-08-21 | 2017-12-19 | 宜兴市永昌轧辊有限公司 | A kind of cold roll hardening and tempering method |
| CN107937673A (en) * | 2017-12-29 | 2018-04-20 | 江苏共昌轧辊股份有限公司 | A kind of heat treatment method of New Type of Cold Roller |
| CN107988479A (en) * | 2017-12-29 | 2018-05-04 | 中钢集团邢台机械轧辊有限公司 | A kind of quasi- differential temperature heat treatment method of large scale roll |
| CN108396114A (en) * | 2018-04-20 | 2018-08-14 | 三峡大学 | The rotating spraying quenching technical of high-chromium abrasion-proof cast iron part |
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2010
- 2010-01-08 CN CN201010033822A patent/CN101760603A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102321795B (en) * | 2011-10-17 | 2013-06-19 | 中钢集团邢台机械轧辊有限公司 | Heat treatment method for high ferrochrome roll requiring stepped hardness of roll body |
| CN102321795A (en) * | 2011-10-17 | 2012-01-18 | 中钢集团邢台机械轧辊有限公司 | Heat treatment method for high ferrochrome roll requiring stepped hardness of roll body |
| CN103572033A (en) * | 2012-08-07 | 2014-02-12 | 上海重型机器厂有限公司 | Thermal treatment method of wide and thick plate supporting roll |
| CN103572033B (en) * | 2012-08-07 | 2015-06-24 | 上海重型机器厂有限公司 | Thermal treatment method of wide and thick plate supporting roll |
| CN104878174B (en) * | 2014-02-28 | 2018-09-07 | 钢铁研究总院 | Control the process of high temperature alloy product heat treatment cooling velocity |
| CN104878174A (en) * | 2014-02-28 | 2015-09-02 | 钢铁研究总院 | Method for controlling heat treatment cooling speed of high temperature alloy product |
| CN104531969A (en) * | 2014-12-19 | 2015-04-22 | 芜湖金龙模具锻造有限责任公司 | Heat treatment method for reducing automobile insert deformation |
| CN104593783A (en) * | 2014-12-29 | 2015-05-06 | 芜湖金龙模具锻造有限责任公司 | Heat treatment method capable of reducing out-of-round deformation of large-diameter ring part |
| CN104593783B (en) * | 2014-12-29 | 2017-04-19 | 东莞市创宇模具配件有限公司 | Heat treatment method capable of reducing out-of-round deformation of large-diameter ring part |
| CN104480290A (en) * | 2014-12-31 | 2015-04-01 | 芜湖金龙模具锻造有限责任公司 | Thermal treatment method for stainless steel plate for automobile sheet metal part |
| CN106086361A (en) * | 2016-07-25 | 2016-11-09 | 杭州汽轮动力集团有限公司 | A kind of Industrial Steam Turbine Rotors Aided forging piecewise heat treatment method |
| CN107488772A (en) * | 2017-08-21 | 2017-12-19 | 宜兴市永昌轧辊有限公司 | A kind of cold roll hardening and tempering method |
| CN107937673A (en) * | 2017-12-29 | 2018-04-20 | 江苏共昌轧辊股份有限公司 | A kind of heat treatment method of New Type of Cold Roller |
| CN107988479A (en) * | 2017-12-29 | 2018-05-04 | 中钢集团邢台机械轧辊有限公司 | A kind of quasi- differential temperature heat treatment method of large scale roll |
| CN107988479B (en) * | 2017-12-29 | 2020-07-17 | 中钢集团邢台机械轧辊有限公司 | Quasi-differential temperature heat treatment method for large-size roller |
| CN108396114A (en) * | 2018-04-20 | 2018-08-14 | 三峡大学 | The rotating spraying quenching technical of high-chromium abrasion-proof cast iron part |
| CN108396114B (en) * | 2018-04-20 | 2020-07-07 | 三峡大学 | Rotary spray quenching process for high-chromium wear-resistant iron casting |
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Application publication date: 20100630 |