CN1325691C - Rare earth controllable carburizing method for furnace for periodical operation - Google Patents
Rare earth controllable carburizing method for furnace for periodical operation Download PDFInfo
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- CN1325691C CN1325691C CNB2005100096594A CN200510009659A CN1325691C CN 1325691 C CN1325691 C CN 1325691C CN B2005100096594 A CNB2005100096594 A CN B2005100096594A CN 200510009659 A CN200510009659 A CN 200510009659A CN 1325691 C CN1325691 C CN 1325691C
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Abstract
The present invention relates to rare-earth controllable carbon potential change carburizing method for a carburizing furnace with periodical operation, particularly to a rare-earth controllable carbon potential change carburizing method. In the present invention, when temperature in a carburizing furnace is risen to 820 DEG C in a temperature rise exhaust stage, a rare-earth carburizer starts to be dropped in the carburizing furnace so that carbon potential Cp in the carburizing furnace is risen from 0.6% at 820 DEG C to 1.45% during hole closure in the mode of period division, and carburizing time is from 80 to 120 minutes; carburizing time in a strong carburizing stage I is from 2 to 4 hours, and the carbon potential Cp is reduced from 1.45% to 1.25% in the mode of period division; carburizing time in a strong carburizing stage II is from 4 to 6 hours, and the carbon potential Cp is reduced from 1.25% to 1.1%; time in a diffusion stage is from 6 to 8 hours, and the carbon potential Cp is reduced from 1.1% to 0.8%. The present invention can exploit the potential of the existing carburizing furnace, increase the carburizing speed and shorten the carburizing time. The carburizing method has obvious effect by the compound action of the rare-earth carburizer and the high carbon potential, generally shortens the carburizing time by more than 30% and saves the electricity by 25 to 35%.
Description
Technical field:
The present invention relates to a kind of rare earth controllable carburizing method for furnace for periodical operation.
Background technology:
Carburizing is a kind of high energy consumption heat processing technique, conventional carburizing needs and will be placed the special-purpose cementing furnace that is heated to 900～950 ℃ by the workpiece of carburizing, in carburizing medium, be incubated a few hours to tens of hours, workpiece surface is infiltrated carbon atom, then workpiece is taken out and quench,, make workpiece surface have high hardness, intensity and wear resistance so that workpiece surface hardness reaches HRC58～65, counter-bending, anti-contact fatigue property is significantly increased, to guarantee as part life-time service such as gear, bearings.This shows that not only the time is long but also work efficiency is low for existing carburization process, the power consumption high.How to shorten the carburization process time, improve carburizing speed, cut down the consumption of energy, usual method is to improve carburizing temperature and improve Carbon Potential Inside Furnace, but because of the restriction that is subjected to carburized workpiece and use steel characteristics is subjected to certain restriction, so, on producing, seldom use.
Summary of the invention:
The purpose of this invention is to provide a kind of rare earth controllable carburizing method for furnace for periodical operation, this method have the carburization process time short, carburizing speed is fast, energy consumption is low, be not subjected to carburized workpiece and use the characteristics of steel characteristics restriction.The present invention uses pit gas carburizing furnace or sealed-box type to use gas carbruizing furance more, and its method is realized by following four-stage: one, intensification exhaust phase; Two, ooze Phase I by force; Three, ooze Phase by force; Four, diffusion phase; Close the hole when the temperature in the intensification exhaust phase cementing furnace rises to 920～940 ℃ at once, the workpiece when diffusion phase finishes in the cementing furnace is cooled to 820～860 ℃ of quenchings of can coming out of the stove; When the temperature in the intensification exhaust phase cementing furnace rose to 820 ℃, beginning splashed into the re carburizing agent in cementing furnace, made the carbon potential C in the cementing furnace
pDuring from 820 ℃ 0.6% rise to 1.45% of Guan Kongshi at times, and carburizing time is 80～120 minutes; The carburizing time that oozes Phase I by force is 2～4 hours, carbon potential C
pReduce to 1.25% at times from 1.45%; The carburizing time that oozes Phase by force is 4～6 hours, carbon potential C
pReduce to 1.1% from 1.25%; The time of diffusion phase is 6～8 hours, carbon potential C
pReduce to 0.8% from 1.1%.Described re carburizing agent is mixed and made into by rare-earth energizer and carburizing medium, and rare-earth energizer accounts for 0.5～2%, carburizing medium accounts for 98～99.5%.Described rare-earth energizer is rare earth ammonia salt or different ring propylhomoserin rare earth.Described carburizing medium is one or both the combination in methyl alcohol, ethanol, Virahol, benzene, vinyl acetic monomer, kerosene, the acetone.The present invention carries out unconventional superelevation and becomes the controlled carburizing of carbon potential before and after promptly closing the hole at the carburizing initial stage of discontinuous running cementing furnace, can excavate the potentiality of existing cementing furnace, improves carburizing speed, shortens carburizing time.Its effect of the compound action of re carburizing agent and high carbon potential is more remarkable, generally can shorten carburizing time and reach more than 33%, economize on electricity 25～35%.
Embodiment:
Embodiment one: present embodiment uses pit gas carburizing furnace or sealed-box type to use gas carbruizing furance more, and its method is realized by following four-stage: one, intensification exhaust phase; Two, ooze Phase I by force; Three, ooze Phase by force; Four, diffusion phase; Close the hole when the temperature in the intensification exhaust phase cementing furnace rises to 920～940 ℃ at once, the workpiece when diffusion phase finishes in the cementing furnace is cooled to 820～860 ℃ of quenchings of can coming out of the stove; When the temperature in the intensification exhaust phase cementing furnace rose to 820 ℃, beginning splashed into the re carburizing agent in cementing furnace, made the carbon potential C in the cementing furnace
pDuring from 820 ℃ 0.6% rise to 1.45% of Guan Kongshi at times, and carburizing time is 80～130 minutes; The carburizing time that oozes Phase I by force is 2～4 hours, carbon potential C
pReduce to 1.25% at times from 1.45%; The carburizing time that oozes Phase by force is 4～6 hours, carbon potential C
pReduce to 1.1% from 1.25%; The time of diffusion phase is 6～8 hours, carbon potential C
pReduce to 0.8% from 1.1%.Described re carburizing agent is mixed and made into by rare-earth energizer and carburizing medium, and rare-earth energizer accounts for 0.5～2%, carburizing medium accounts for 98～99.5%.Described rare-earth energizer is rare earth ammonia salt or different ring propylhomoserin rare earth.Described carburizing medium is one or both the combination in methyl alcohol, ethanol, Virahol, benzene, vinyl acetic monomer, kerosene, the acetone.Described carbon potential C
pDuring from 820 ℃ 0.6% rise to 1.45% of Guan Kongshi at times: C
p0.6%/15～25 minutes, C
p0.8%/15～25 minutes, C
p1.0%/15～25 minutes, C
p1.2%/15～25 minutes, C
p1.45%/30～50 minutes.Described carbon potential C
pReducing to 1.25% at times from 1.45% is: C
p1.45%/40～80 minutes, C
p1.35%/40～80 minutes, C
p1.25%/40～80 minutes.
Example 1: 8～10 tons of bogie back axle master passive terminal drving sprial gears of certain factory and gearbox gear, modulus M8～10 and M4-6, requiring case depth is 1.7～2.1mm and 0.6-1.1mm, material is 20C
rMoH or 22C
rMoH, 930 ℃ of former technology carburizing temperatures.Because of this material forms thick strip or carbide claw-like, that pattern is not good enough surpasses the metallographic examination standard especially easily on the austenite grain boundary of carburized case or triangle crystal boundary, so can only adopt Carbon Potential Inside Furnace C
pStandard type 105 pit carburizing furnace carburizings are used in=1.0% low carbon potential carburizing, and to reaching carburized layer depth 1.7mm and the quenching of coming out of the stove more than the 0.6mm, required time is 24 and 7 hours from shove charge.And adopt method of the present invention, and workpiece only quenches to coming out of the stove with 16 hours and 5 hours from going into stove, and case depth reaches 1.8 ± 0.05mm and 0.7 scholar 0.05, and saving 8 hours man-hours and 2 hours, the raising infiltration rate is more than 33%.The metallographic structure carbide is 2～3 grades of fine particle shapes, and martensite and paralympicly be respectively 1～3 grade is all limit in control criterion.
Example 2: the big-and-middle-sized bearing of certain rail vehicle, material are 20C
rNiM.The steel carburizing requires carburized layer depth 2.7～3.1mm, and hardness is HRC59～63 behind the carburizing and quenching, and centre hardness is HRC38～42, makes carburizing treatment in the 180KW pit carburizing furnace, and medium is that methyl alcohol adds kerosene.The Carbon Potential Inside Furnace monitoring is oxygen probe, and it is the carbon-potential control intelligence instrument that control instruments is promptly carried out instrument, by computer control, when with conventional one-stage process carburizing temperature being 930 ℃, furnace gas control carbon potential C
p=1.2%, expend about 30 hours of man-hour from shove charge to the quenching of coming out of the stove, about the about 2.8mm of carburized layer depth.Under identical carburizing temperature condition, only needed just reach more than the carburized layer depth 2.8mm in 20～22 hours with method of the present invention, reduced work hours 8～10 hours, improve infiltration rate 26～33%, metallographic structure meets inspecting standard.(this bearing still need second-heating, pressurization, quenching and ground finish.)
Claims (3)
1, rare earth controllable carburizing method for furnace for periodical operation, this method use pit gas carburizing furnace or sealed-box type to use gas carbruizing furance more, and its method is realized by following four-stage: one, intensification exhaust phase; Two, ooze Phase I by force; Three, ooze Phase by force; Four, diffusion phase; Close the hole when the temperature in the intensification exhaust phase cementing furnace rises to 920～940 ℃ at once, the workpiece when diffusion phase finishes in the cementing furnace is cooled to 820～860 ℃ of quenchings of can coming out of the stove; It is characterized in that when the temperature in the intensification exhaust phase cementing furnace rises to 820 ℃ beginning splashes into the re carburizing agent in cementing furnace, make the carbon potential C in the cementing furnace
pDuring from 820 ℃ 0.6% rise to 1.45% of Guan Kongshi at times, and carburizing time is 80～120 minutes; The carburizing time that oozes Phase I by force is 2～4 hours, carbon potential C
pReduce to 1.25% at times from 1.45%; The carburizing time that oozes Phase by force is 4～6 hours, carbon potential C
pReduce to 1.1% from 1.25%; The time of diffusion phase is 6～8 hours, carbon potential C
pReduce to 0.8% from 1.1%, described re carburizing agent is mixed and made into by rare-earth energizer and carburizing medium, rare-earth energizer accounts for 0.5～2%, carburizing medium accounts for 98～99.5%, described rare-earth energizer is rare earth ammonia salt or different ring propylhomoserin rare earth, and described carburizing medium is one or both the combination in methyl alcohol, ethanol, Virahol, benzene, vinyl acetic monomer, kerosene, the acetone.
2, rare earth controllable carburizing method for furnace for periodical operation according to claim 1 is characterized in that described carbon potential C
pDuring from 820 ℃ 0.6% rise to 1.45% of Guan Kongshi at times: C
p0.6%/15～25 minutes, C
p0.8%/15～25 minutes, C
p1.0%C/15～25 minute, C
p1.2%/15～25 minutes, C
p1.45%/30～50 minutes.
3, rare earth controllable carburizing method for furnace for periodical operation according to claim 1 is characterized in that described carbon potential C
pReducing to 1.25% at times from 1.45% is: C
p1.45%/40～80 minutes, C
p1.35%/40～80 minutes, C
p1.25%/40～80 minutes.
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| CNB2005100096594A CN1325691C (en) | 2005-01-21 | 2005-01-21 | Rare earth controllable carburizing method for furnace for periodical operation |
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| CNB2005100096594A CN1325691C (en) | 2005-01-21 | 2005-01-21 | Rare earth controllable carburizing method for furnace for periodical operation |
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| CN1644750A CN1644750A (en) | 2005-07-27 |
| CN1325691C true CN1325691C (en) | 2007-07-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468577A (en) * | 2018-12-13 | 2019-03-15 | 周俊满 | A kind of annular element carburizing quenching process |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191364B (en) * | 2011-05-25 | 2012-11-14 | 浙江浦江齿轮有限公司 | Carburizing and quenching process for gear made of alloy steel |
| CN103276343B (en) * | 2013-06-17 | 2015-03-18 | 上海汇森益发工业炉有限公司 | Controllable atmosphere carburizing method for multi-use furnace |
| CN104213070B (en) * | 2014-07-30 | 2018-12-11 | 珠海市钧兴机电有限公司 | Sewing machine gear wheel carburization layer control technique |
| CN104711401B (en) * | 2015-02-09 | 2017-12-05 | 中车戚墅堰机车车辆工艺研究所有限公司 | Large heavy-load gear carburization quenching method |
| CN105483604B (en) * | 2015-12-30 | 2018-02-13 | 武汉材料保护研究所 | A kind of raising austenitic stainless steel cryogenic gas carburizing speed urges infiltration method |
| CN109536884A (en) * | 2018-12-06 | 2019-03-29 | 哈尔滨工业大学 | A kind of carburizing steel surface layer obtains method for carburizing and the application of high tough heterogeneous structure |
| CN110551967A (en) * | 2019-10-10 | 2019-12-10 | 吴江华宏真空科技有限公司 | rare earth catalytic infiltration process for improving workpiece heat treatment carburization speed |
| CN114214589A (en) * | 2021-12-17 | 2022-03-22 | 大连长丰实业总公司 | Carburizing method suitable for drop-feed gas carburizing furnace |
Citations (4)
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|---|---|---|---|---|
| CN1061443A (en) * | 1990-11-13 | 1992-05-27 | 哈尔滨工业大学 | Process of low temperature and high concentration gaseous carburizing of rare-earth elements |
| CN2295764Y (en) * | 1997-04-17 | 1998-10-28 | 阎牧夫 | Continuous rare earth accelarator feeding unit of air status controlling carburizing apparatus |
| JP2002256411A (en) * | 2001-02-28 | 2002-09-11 | Nsk Ltd | Carburizing method |
| JP2004244673A (en) * | 2003-02-13 | 2004-09-02 | Nissan Motor Co Ltd | Carburizing method |
-
2005
- 2005-01-21 CN CNB2005100096594A patent/CN1325691C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061443A (en) * | 1990-11-13 | 1992-05-27 | 哈尔滨工业大学 | Process of low temperature and high concentration gaseous carburizing of rare-earth elements |
| CN2295764Y (en) * | 1997-04-17 | 1998-10-28 | 阎牧夫 | Continuous rare earth accelarator feeding unit of air status controlling carburizing apparatus |
| JP2002256411A (en) * | 2001-02-28 | 2002-09-11 | Nsk Ltd | Carburizing method |
| JP2004244673A (en) * | 2003-02-13 | 2004-09-02 | Nissan Motor Co Ltd | Carburizing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468577A (en) * | 2018-12-13 | 2019-03-15 | 周俊满 | A kind of annular element carburizing quenching process |
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Assignee: Harbin Jinxin Electric Co., Ltd. Assignor: Harbin Institute of Technology Contract record no.: 2010230000035 Denomination of invention: Rare earth controllable carburizing method for furnace for periodical operation Granted publication date: 20070711 License type: Exclusive License Open date: 20050727 Record date: 20100622 |
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