CN100497668C - High-speed tool steel wire vacuum heat treatment technique - Google Patents
High-speed tool steel wire vacuum heat treatment technique Download PDFInfo
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- CN100497668C CN100497668C CNB2007101584791A CN200710158479A CN100497668C CN 100497668 C CN100497668 C CN 100497668C CN B2007101584791 A CNB2007101584791 A CN B2007101584791A CN 200710158479 A CN200710158479 A CN 200710158479A CN 100497668 C CN100497668 C CN 100497668C
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Abstract
The invention relates to a high speed tool steel wire vacuum heat treatment technology, which belongs to the vacuum heat treatment field. The high speed tool steel wire vacuum heat treatment technology comprises high speed tool steel wire cleaning, drying, vacuum annealing, drawing, flat wire rolling, and vacuum welding. The vacuum annealing is performed under the vacuum degree of 2*10<-2>Pa to 3 Pa, after the work piece is heated to 600 plus or minus 5 DEG C for 60 minutes, and the thermal retardation is performed for 30 minutes, and is heated to 820 to 850 DEG C for 30minutes, and the temperature of the work piece is reduced to 600 plus or minus 5 DEG C at the cooling speed of 25 DEG C per hour, when a furnace is cooled at 400 to 350 DEG C, the nitrogen gas of two barometric pressures is filled into the furnace to perform circulation cooling, and the work piece is taken out of the furnace when the temperature is reduced to 60 DEG C; the period of the vacuum annealing is 22 to 27 hours. The invention has the advantages that the surface of the high speed tool steel wire vacuum annealing has no nitrogen leakage, to ensure that the welding seam has no air bubble and no welding missing during the welding; simultaneously the surface has no oxidation and no decarburization, and the size precision is high; The mechanical property and the hardness degree are even.
Description
Technical field
The present invention relates to a kind of high-speed tool steel wire vacuum heat treatment technique, belong to the vacuum heat treatment field.
Background technology
Sawing is the requisite a kind of working method of machine industry and metallurgy industry.From U.S.'s invention bimetal bandsaw, eliminated outmoded reciprocating saw and sawing machine, already bring a field technology revolution for sawing.Because its saw kerf is narrow, speed is fast, precision is high, has improved production efficiency greatly, save metallic substance, save energy with the band saw blanking.The bimetal bandsaw key is the fine bimetal saw blade, is used to make the required high-speed flat tool steel wire of composite band tooth portion of bimetal saw blade, and is with high content of technology, specification of quality is tight.Welding just is that with high-speed tool steel wire and the difference of general purpose steel wire high-speed tool steel wire through being processed into flat filament (being that cross section is the orthogonal steel wire), finally will be connected into bimetallic composite band with high-speed flat tool steel wire and alloy spring steel tape welding with vacuum electron beam welder.Therefore, for high-speed flat tool steel wire except that requiring it should have the conventional surface requirements such as ordinary steel wire not oxidation of surface, not decarburization, also its surface of special requirement can not carburizing, can not nitriding, and dimensional precision is wanted high (it is vertical mutually that want at four angles of orthogonal, and guarantee certain angle, garden); Especially it is higher to the requirement of quality with rapid tool steel M42 flat filament to produce band saw.So conventional thermal treatment process and complete processing are difficult to reach specification of quality.
Conventional thermal treatment process adopts nitrogen protection furnace annealing technology and sand seal jar carburetting annealing process, and Steel Wire Surface is easy to occur defect layers such as nitriding, carburizing, decarburization, oxidation, and steel wire must be removed surface imperfection through pickling repeatedly.Because atmosphere protection annealing makes the Steel Wire Surface nitriding; though remove the surface carburization layer through pickling; but clean still not thorough; being rolled into flat filament is easy to generate bubble, leaks defectives such as weldering, rosin joint in the commissure when finally welding; have a strong impact on the saw blade quality, cause band saw all to need from external import with high-speed flat tool steel wire.
The import high-speed flat tool steel wire no decarburization in surface at present, non-oxidation, the dimensional precision height, without test weld, still still there is content 100 * 10 in good uniformity during welding
-6～200 * 10
-6Nitrogen.Vacuum annealing process is generally all adopted in external high-speed tool steel wire annealing, the well vacuum stove of making in the Britain IPSEM industrial that " metal products " delivered on the magazine in 1987, be used for high-speed tool steel wire annealing in Peterstubs company, vacuumize vacuum tightness 5 * 10 after the shove charge
-2～5 * 10
-3Torr (6.67Pa～0.667Pa), reheat heats up, and arrives 850 ℃ after 4 hours, be incubated 4 hours, charges into nitrogen when arriving at high temperature, increases dividing potential drop, control speed for per hour 20 ℃ up to 650 ℃, charge into a large amount of nitrogen then, circulating is chilled to room temperature; Its high-speed tool steel disk circle of HIT adopts vacuum annealing to handle vacuum tightness 6.67Pa～0.667Pa (5 * 10 for another example
-2～5 * 10
-3Torr), in soaking time, also charge into nitrogen simultaneously.[Wu Yuanchang, " Dalian special steel collected works ", 1983, (1): 47].
External high-speed tool steel wire vacuum annealing process all charges into nitrogen at the soak section, causes steel wire to produce nitriding, reduces weldability, influences welding quality.Bimetal saw blade requires to have high weldability with high-speed flat tool steel wire, therefore requires in vacuum annealing, and nitriding can not take place on the surface.
Summary of the invention
The vacuum heat treatment process that the purpose of this invention is to provide a kind of high-speed tool steel wire no nitriding in surface improves bimetal saw blade high-speed flat tool steel wire weldability and welding quality.
For solving the problems of the technologies described above, the present invention takes following concrete technical scheme:
A kind of high-speed tool steel wire vacuum heat treatment technique flow process is included as high-speed tool steel wire cleaning, oven dry, vacuum annealing, drawing, rolling flat filament and carries out vacuum welding at last.Vacuum annealing is 2 * 10
-2Pa～3Pa vacuum tightness, heat 60 minutes to 600 ℃ ± 5 ℃ insulations after 30 minutes, 30 minutes to 820 ℃～850 ℃ insulations of reheat 270 minutes, be cooled to 600 ℃ ± 5 ℃ with 25 ℃ of/hour cooling rates afterwards, the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 400 ℃～350 ℃ with stove, be cooled to 60 ℃ and come out of the stove; The vacuum annealing cycle is 22～27 hours.
When thermal treatment rapid tool steel M42 steel wire, 2 * 10
-2Pa～3 * 10
-1Pa vacuum tightness heated insulation in 60 minutes to 605 ℃ after 30 minutes, and reheat insulation in 30 minutes to 850 ℃ 270 minutes is afterwards 2 * 10
-1Pa～3 * 10
-1Pa vacuum tightness is cooled to 597 ℃ with 25 ℃ of/hour cooling rates, and the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 350 ℃ with stove, be cooled to 60 ℃ and come out of the stove; The vacuum annealing cycle is 24～27 hours.
When thermal treatment rapid tool steel M3 steel wire, 3 * 10
-2Pa～3Pa vacuum tightness heated insulation in 60 minutes to 600 ℃ after 30 minutes, and reheat insulation in 30 minutes to 850 ℃ 270 minutes is afterwards 2 * 10
-1Pa～3 * 10
-1Pa vacuum tightness is cooled to 604 ℃ with 25 ℃ of/hour cooling rates, and the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 398 ℃ with stove, be cooled to 60 ℃ and come out of the stove; The vacuum annealing cycle is 22～24 hours.
When thermal treatment high-speed tool M2 steel wire, 3 * 10
-2Pa～3Pa vacuum tightness heated insulation in 60 minutes to 596 ℃ after 30 minutes, and reheat insulation in 30 minutes to 820 ℃ 270 minutes is afterwards 2 * 10
-1Pa～3 * 10
-1Pa vacuum tightness is cooled to 602 ℃ with 25 ℃ of/hour cooling rates, and the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 370 ℃ with stove, be cooled to 60 ℃ and come out of the stove; The vacuum annealing cycle is 22～24 hours.
Matting adopts the rust-preventive agent confining liquid.
Vacuum annealing furnace is provided with two lobe pumps, can use one of them lobe pump in turn during work, and can adjust vacuum tightness as required at any time.
High-speed tool steel wire conventional annealing technology and vacuum annealing process are analyzed.
The guiding theory of technique scheme is: vacuum heat treatment not only can realize the non-oxidation of high-speed tool steel wire, no decarburization, the degassing, degreasing, but also can realize few distortion of the pollution-free and workpiece produced, and when selecting not inflated with nitrogen, selecting appropriate vacuum degree simultaneously, promptly prevent nitriding, prevent the volatilization of metallic matrix element under the vacuum state again, guaranteed high-speed tool steel wire welding property, annealed structure and mechanical property and dimension precision requirement; And vacuum annealing process is easy to control.
The invention has the beneficial effects as follows:
1) owing to 820 ℃～850 ℃ of high temperature be cooled in 400 ℃～350 ℃ the process, remains 2 * 10
-2Pa～3Pa vacuum tightness, the high-speed tool steel wire assay shows that condition of surface " comes to the same thing with raw material "---nitriding and oxidative phenomena do not take place, decarburization is 0; The Mechanics Performance Testing result shows that relative reduction in area and uniformity of hardness are good.By after the technology vacuum heat treatment of the present invention, the high-speed tool steel wire physicochemical property is fine.
2) because after the vacuum heat treatment, the surface of high-speed tool steel wire does not have carburizing, no decarburization, non-oxidation, the degassing, degreasing, so surface size precision height, and is pollution-free.
3) because surface no nitriding, surface size precision height, high-speed flat tool steel wire contact tightly, weld seam does not have bubble, the nothing leakage is welded, and has improved the welding quality of composite band and bands for band with the alloy spring steel strip surface, the raising lumber recovery reduces cost, environmental.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the high-speed tool steel wire vacuum heat treatment technique curve.Wherein X-coordinate be the time (minute) coordinate, ordinate zou be temperature (℃) coordinate.High-speed tool steel wire vacuum annealing is in vacuum tightness 2 * 10
-2Among Pa～3Pa, heat 60 minutes to 600 ℃ ± 5 ℃ insulations after 30 minutes, 30 minutes to 820 ℃～850 ℃ insulations of reheat 270 minutes, be cooled to 600 ℃ ± 5 ℃ with 25 ℃ of/hour cooling rates afterwards, the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 400 ℃～350 ℃ with stove, be cooled to 60 ℃ and come out of the stove.The vacuum annealing cycle is 22～27 hours.
Embodiment
Embodiment 1: rapid tool steel M42 steel wire, and φ 4.9mm, 482kg uses confining liquid to clean up, and neither corrodes steel wire matrix, anti-Steel Wire Surface oxidation again, and drying and sealing back shove charge afterwards carried out vacuum annealing and handled.Two lobe pumps of vacuum annealing furnace can use one of them lobe pump in turn, adjust vacuum tightness as required at any time.The vacuum tightness of vacuum annealing is adjusted at 2 * 10
-2Pa～3 * 10
-1Pa began steel wire heating insulation in 60 minutes to 605 ℃ after 30 minutes, and reheat insulation in 30 minutes to 850 ℃ 270 minutes is adjusted at 2 * 10 with vacuum tightness afterwards
-1Pa～3 * 10
-1Pa is cooled to 597 ℃ with 25 ℃ of/hour cooling rates, and the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 350 ℃ with stove, be cooled to 60 ℃ and come out of the stove.The whole cycle of vacuum annealing is 24～27 hours.Come out of the stove steel wire again through drawing, be rolled into flat filament, with vacuum electron beam welder flat filament and alloy spring steel tape welding are connected into bimetallic composite band at last.
Embodiment 2: rapid tool steel M3 steel wire, and φ 3.0mm, 490kg uses confining liquid to clean up, and neither corrodes steel wire matrix, anti-Steel Wire Surface oxidation again, and drying and sealing back shove charge afterwards carried out vacuum annealing and handled.Two lobe pumps of vacuum annealing furnace can use one of them lobe pump in turn, adjust vacuum tightness as required at any time.The vacuum tightness of vacuum annealing is adjusted at 2 * 10
-2Pa～3Pa began steel wire heating insulation in 60 minutes to 600 ℃ after 30 minutes, and reheat insulation in 30 minutes to 850 ℃ 270 minutes is adjusted at 2 * 10 with vacuum tightness afterwards
-1Pa～3 * 10
-1Pa is cooled to 604 ℃ with 25 ℃ of/hour cooling rates, and the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 398 ℃ with stove, be cooled to 60 ℃ and come out of the stove.The whole cycle of vacuum annealing is 22～24 hours.Come out of the stove steel wire again through drawing, be rolled into flat filament, with vacuum electron beam welder flat filament and alloy spring steel tape welding are connected into bimetallic composite band at last.
Embodiment 3: rapid tool steel M2 steel wire, and φ 1.5mm, 502kg uses confining liquid to clean up, and neither corrodes steel wire matrix, anti-Steel Wire Surface oxidation again, and drying and sealing back shove charge afterwards carried out vacuum annealing and handled.Two lobe pumps of vacuum annealing furnace can use one of them lobe pump in turn, adjust vacuum tightness as required at any time.The vacuum tightness of vacuum annealing is adjusted at 2 * 10
-2Pa～3Pa began steel wire heating insulation in 60 minutes to 596 ℃ after 30 minutes, and reheat insulation in 30 minutes to 820 ℃ 270 minutes is adjusted at 2 * 10 with vacuum tightness afterwards
-1Pa～3 * 10
-1Pa is cooled to 602 ℃ with 25 ℃ of/hour cooling rates, and the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 370 ℃ with stove, be cooled to 60 ℃ and come out of the stove.The whole cycle of vacuum annealing is 22～24 hours.Come out of the stove steel wire again through drawing, be rolled into flat filament, with vacuum electron beam welder flat filament and alloy spring steel tape welding are connected into bimetallic composite band at last.
Following table has been listed material, specification, batch and the vacuum annealing process parameter list of the foregoing description.
Following table has been listed the physicochemical property assay data sheet of the foregoing description
In sum, the present invention not only fills up a blank of domestic this technical field, and has improved the deficiency of external technology, improves homemade bands for band quality greatly, enhances our international competitiveness.
Claims (6)
1, a kind of high-speed tool steel wire vacuum heat treatment technique, flow process are included as high-speed tool steel wire cleaning, oven dry, vacuum annealing, drawing, rolling flat filament and carry out vacuum welding at last, and it is characterized in that: vacuum annealing is 2 * 10
-2Pa～3Pa vacuum tightness, heat 60 minutes to 600 ℃ ± 5 ℃ insulations after 30 minutes, 30 minutes to 820 ℃～850 ℃ insulations of reheat 270 minutes, be cooled to 600 ℃ ± 5 ℃ with 25 ℃ of/hour cooling rates afterwards, the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 400 ℃～350 ℃ with stove, be cooled to 60 ℃ and come out of the stove; The vacuum annealing cycle is 22～27 hours.
2, according to the described high-speed tool steel wire vacuum heat treatment technique of claim 1, it is characterized in that: when thermal treatment rapid tool steel M42 steel wire, 2 * 10
-2Pa～3 * 10
-1Pa vacuum tightness heated insulation in 60 minutes to 605 ℃ after 30 minutes, and reheat insulation in 30 minutes to 850 ℃ 270 minutes is afterwards 2 * 10
-1Pa～3 * 10
-1Pa vacuum tightness is cooled to 604 ℃ with 25 ℃ of/hour cooling rates, and the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 398 ℃ with stove, be cooled to 60 ℃ and come out of the stove; The vacuum annealing cycle is 24～27 hours.
3, according to the described high-speed tool steel wire vacuum heat treatment technique of claim 1, it is characterized in that: when thermal treatment rapid tool steel M3 steel wire, 3 * 10
-2Pa～3Pa vacuum tightness heated insulation in 60 minutes to 600 ℃ after 30 minutes, and reheat insulation in 30 minutes to 850 ℃ 270 minutes is afterwards 2 * 10
-1Pa～3 * 10
-1Pa vacuum tightness is cooled to 602 ℃ with 25 ℃ of/hour cooling rates, and the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 370 ℃ with stove, be cooled to 60 ℃ and come out of the stove; The vacuum annealing cycle is 22～24 hours.
4, according to the described high-speed tool steel wire vacuum heat treatment technique of claim 1, it is characterized in that: when thermal treatment high-speed tool M2 steel wire, 3 * 10
-2Pa～3Pa vacuum tightness heated insulation in 60 minutes to 596 ℃ after 30 minutes, and reheat insulation in 30 minutes to 820 ℃ 270 minutes is afterwards 2 * 10
-1Pa～3 * 10
-1Pa vacuum tightness is cooled to 597 ℃ with 25 ℃ of/hour cooling rates, and the back begins to charge into two atmospheric nitrogen circulation coolings in stove when being chilled to 350 ℃ with stove, be cooled to 60 ℃ and come out of the stove; The vacuum annealing cycle is 22～24 hours.
According to the described hot high-speed tool steel wire vacuum heat treatment technique of claim 1, it is characterized in that 5, matting adopts the rust-preventive agent confining liquid.
6, according to the described high-speed tool steel wire vacuum heat treatment technique of claim 1, it is characterized in that: vacuum annealing furnace is provided with two lobe pumps, can use one of them lobe pump in turn during work, and adjusts vacuum tightness as required at any time.
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| CN101864511B (en) * | 2009-04-20 | 2012-06-27 | 无锡日月合金材料有限公司 | Annealing process of sealing welding flux |
| CN102534175A (en) * | 2012-02-15 | 2012-07-04 | 铃木加普腾钢丝（苏州）有限公司 | Steel wire tempering process |
| CN102873447A (en) * | 2012-10-12 | 2013-01-16 | 天津冶金集团中兴盛达钢业有限公司 | Steel wire connecting method |
| CN103114193B (en) * | 2013-03-20 | 2015-03-11 | 沈阳飞机工业（集团）有限公司 | Thermal treatment process for 9SiCr pin reamer |
| WO2018107473A1 (en) * | 2016-12-16 | 2018-06-21 | 蔡赛 | Annealing and heat treatment method for steel wire |
| CN109777925B (en) * | 2019-01-08 | 2020-11-24 | 苏州腾凯金属材料有限公司 | Vacuum annealing method for air outlet valve of safety air bag |
| CN109652627B (en) * | 2019-01-16 | 2020-09-15 | 天长市润源金属制品有限公司 | Annealing processing technology for producing high-performance metal wire |
| CN111192839B (en) * | 2020-01-07 | 2023-05-12 | 贵州振华风光半导体股份有限公司 | Method for controlling internal water vapor content of black ceramic low-melting glass shell integrated circuit |
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