CN103468916A - Heat treatment process for bevel gear - Google Patents
Heat treatment process for bevel gear Download PDFInfo
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- CN103468916A CN103468916A CN2013103239611A CN201310323961A CN103468916A CN 103468916 A CN103468916 A CN 103468916A CN 2013103239611 A CN2013103239611 A CN 2013103239611A CN 201310323961 A CN201310323961 A CN 201310323961A CN 103468916 A CN103468916 A CN 103468916A
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Abstract
The invention discloses a heat treatment process for a bevel gear. The process comprises the following successive steps: isothermal normalizing; carburizing; and quenching. According to the invention, common normalizing is changed into isothermal normalizing, and the carburizing process is changed into recrystallization twice; thus, heat treatment of the bevel gear is substantially simplified, and processing cost is reduced.
Description
Technical field
The present invention relates to a kind of conical gear thermal treatment process.
Background technology
Conical gear is the drive disk assembly of often using in power transmission, and it needs to improve its every characteristic through necessary thermal treatment in process of production.Existing conical gear thermal treatment process comprises common normalizing, carburizing, quenching, second-heating, the step such as quenching again, operates more various and cost of manufacture is higher.In prior art, urgent need is a kind of simple to operate, the conical gear thermal treatment process that cost is low.
Summary of the invention
The object of the invention is to overcome the defect existed in prior art, provide a kind of simple to operate, the conical gear thermal treatment process that cost is low.
For achieving the above object, technical scheme of the present invention has been to provide a kind of conical gear thermal treatment process, and described conical gear thermal treatment process is carried out according to isothermal normalizing, carburizing and quenching step successively.By changing common normalizing into isothermal normalizing, changing cementation process into twice recrystallization can simplify the heat treatment process of conical gear greatly, also can cut down finished cost simultaneously.
As preferably, described isothermal normalizing is insulation 60 minutes after first conical gear being preheated to 935 ℃; Then conical gear is chilled to 650 ℃ soon by fast cold mode, is incubated more than 120 minutes; Last naturally cooling or air-cooled cooling in air.
As preferably, then described fast cold mode sprays the combined cooling of water smoke for conical gear being placed in to air in air-cooled to conical gear.
As preferably, the described fast cold mode time length is within 30 minutes.
As preferably, described carburizing comprises the following steps:
The first step, conical gear is preheated to 880 ℃ after insulation 60 minutes, during this, keep carbon potential 0.8;
Second step, conical gear is preheated to 925 ℃ after insulation more than 60 minutes, during this, keep carbon potential 0.78 ~ 1.24;
The 3rd step, conical gear is cooled to 650 ℃ after insulation 90 minutes, during this, keep carbon potential 0.78;
The 4th step, conical gear is heated to 840 ℃ again after insulation 90 minutes, during this, keep carbon potential 0.78.
As preferably, described quenching refers to temperature after carburizing directly cooling by heat-eliminating medium at the conical gear of 840 ℃, and described heat-eliminating medium is water, salt solution, mineral oil or air.
As preferably, described preheating method is electrically heated.
Advantage of the present invention and beneficial effect are: by changing common normalizing into isothermal normalizing, changing cementation process into twice recrystallization can simplify the heat treatment process of conical gear greatly, also can cut down finished cost simultaneously.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is further described.Following examples are only for technical scheme of the present invention more clearly is described, and can not limit the scope of the invention with this.
As shown in Figure 1, a kind of conical gear thermal treatment process, described conical gear thermal treatment process is carried out according to isothermal normalizing, carburizing and quenching step successively.
Described isothermal normalizing is to be incubated 60 minutes after first conical gear being preheated to 935 ℃; Then conical gear is chilled to 650 ℃ soon by fast cold mode, is incubated more than 120 minutes; Last naturally cooling or air-cooled cooling in air.
The handled conical gear steel of the present invention are 17CrNiMo6, often adopt common normalizing pre-treatment in prior art, and it is directly cooling in air after 1h that workpiece is heated to 935 ℃ of insulations, owing to being the Cr-Ni steel, therefore its hardening capacity is relatively good, in air, just can obtain sorbite, troostite, Martensite-Bainite Mixed Microstructure, its hardness value is higher, is unfavorable for follow-up cold working, in addition because the perlite type tissue first formed can slowly be grown up, what then form is little, so its normalizing state tissue odds is even.And use the isothermal normalizing in invention to carry out pre-treatment, and workpiece is heated to after 935 ℃ of insulation 1h be as cold as soon the pearlitic transformation district, select suitable isothermal temperature according to hardness requirement, can obtain uniform perlite type tissue.
Therefore, select isothermal normalizing to there is tissue and performance more uniformly, can better for cold working and carburizing and quenching backward, carry out the tissue preparation, and can reduce distorsion during quenching.
Then described fast cold mode sprays the combined cooling of water smoke for conical gear being placed in to air in air-cooled to conical gear.
The described fast cold mode time length is within 30 minutes.
Described carburizing comprises the following steps:
The first step, conical gear is preheated to 880 ℃ after insulation 60 minutes, during this, keep carbon potential 0.8;
Second step, conical gear is preheated to 925 ℃ after insulation more than 60 minutes, during this, keep carbon potential 0.78 ~ 1.24;
The 3rd step, conical gear is cooled to 650 ℃ after insulation 90 minutes, during this, keep carbon potential 0.78;
The 4th step, conical gear is heated to 840 ℃ again after insulation 90 minutes, during this, keep carbon potential 0.78.
Existing carburizing tech is under common normalizing preheating prerequisite, carry out the carburizing operation, also to pass through second-heating and secondary quenching afterwards, the steel surface of gained is needle type martensite+a small amount of carbide+residual austenite, core is low-carbon lath martensite, similar with the result of gained of the present invention, loaded down with trivial details much but operation lacks.Carburizing mode of the present invention has reasonably been utilized the secondary recrystallization principle, under the prerequisite of avoiding coarse grain, abundant residues austenitic formation and metallographic structure and hardness, not only greatly saved production cost, enhance productivity, and do not need to carry out the second-heating quenching, its stress is reduced relatively, and technique is simpler, has reduced to a certain extent distorsion during quenching.
Described quenching refers to temperature after carburizing directly cooling by heat-eliminating medium at the conical gear of 840 ℃, and described heat-eliminating medium is water, salt solution, mineral oil or air.
Described preheating method is electrically heated.
More than comprehensive, the thermal treatment in advance of 17CrNiMo6 steel the best is isothermal normalizing, obtains uniform perlite type tissue, carries out tissue for carburizing and quenching and prepares.And carburizing quenching process is carburizing mode of the present invention, not only saves the production time, but also reduce distorsion during quenching.Its tissue is followed successively by the hypereutectoid layer: needle type martensite+a small amount of carbide+residual austenite, eutectoid layer: needle type martensite+residual austenite, hypoeutectoid layer: low carbon martensite+a small amount of tempering cryptocrystalline martensite, core: low carbon martensite+a small amount of ferrite.This tissue makes the steel top layer have high hardness, wear resistance and contact fatigue strength, and core has enough intensity and plasticity toughness, has met the different performance requriements of piece surface and core.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection domain of invention.
Claims (7)
1. a conical gear thermal treatment process, it is characterized in that: described conical gear thermal treatment process is carried out according to isothermal normalizing, carburizing and quenching step successively.
2. conical gear thermal treatment process as claimed in claim 1 is characterized in that: described isothermal normalizing is insulation 60 minutes after first conical gear being preheated to 935 ℃; Then conical gear is chilled to 650 ℃ soon by fast cold mode, is incubated more than 120 minutes; Last naturally cooling or air-cooled cooling in air.
3. conical gear thermal treatment process as claimed in claim 2 is characterized in that: then described fast cold mode sprays the combined cooling of water smoke for conical gear being placed in to air in air-cooled to conical gear.
4. conical gear thermal treatment process as claimed in claim 3, it is characterized in that: the described fast cold mode time length is within 30 minutes.
5. conical gear thermal treatment process as claimed in claim 4, it is characterized in that: described carburizing comprises the following steps:
The first step, conical gear is preheated to 880 ℃ after insulation 60 minutes, during this, keep carbon potential 0.8;
Second step, conical gear is preheated to 925 ℃ after insulation more than 60 minutes, during this, keep carbon potential 0.78 ~ 1.24;
The 3rd step, conical gear is cooled to 650 ℃ after insulation 90 minutes, during this, keep carbon potential 0.78;
The 4th step, conical gear is heated to 840 ℃ again after insulation 90 minutes, during this, keep carbon potential 0.78.
6. conical gear thermal treatment process as claimed in claim 5 is characterized in that: described quenching refers to temperature after carburizing directly cooling by heat-eliminating medium at the conical gear of 840 ℃, and described heat-eliminating medium is water, salt solution, mineral oil or air.
7. conical gear thermal treatment process as claimed in claim 6, it is characterized in that: described preheating method is electrically heated.
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| CN2013103239611A CN103468916A (en) | 2013-07-29 | 2013-07-29 | Heat treatment process for bevel gear |
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| CN2013103239611A CN103468916A (en) | 2013-07-29 | 2013-07-29 | Heat treatment process for bevel gear |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480260A (en) * | 2014-12-25 | 2015-04-01 | 湖北新冶钢汽车零部件有限公司 | Isothermal normalizing furnaceburdentray |
| CN104962705A (en) * | 2015-07-29 | 2015-10-07 | 山东伊莱特重工有限公司 | Isothermal normalizing treatment technique of wind power flange |
| CN105239033A (en) * | 2015-11-10 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Composite carburizing and quenching heat treatment method of gear |
| CN105349904A (en) * | 2015-11-10 | 2016-02-24 | 宁波市鸿博机械制造有限公司 | Preparation method of steel valve plug |
| CN105420615A (en) * | 2015-11-10 | 2016-03-23 | 宁波市鸿博机械制造有限公司 | Steel valve plug |
| CN110343823A (en) * | 2019-07-31 | 2019-10-18 | 北京机电研究所有限公司 | A kind of isothermal normalizing heat treatment process |
| CN111500834A (en) * | 2020-05-27 | 2020-08-07 | 江苏联峰实业有限公司 | Heat treatment process of gear steel for automobile gearbox |
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| CN101265582A (en) * | 2008-04-30 | 2008-09-17 | 上海热处理厂有限公司 | 20CrMnMo energy-saving carburizing composite heat treating process |
| JP2008266762A (en) * | 2007-04-25 | 2008-11-06 | Aisin Seiki Co Ltd | Method for manufacturing metal material including carburizing treatment process |
| KR20090008554A (en) * | 2007-07-18 | 2009-01-22 | 셰플러코리아(유) | Steel for bearing having high resistance to the outer particles and the heat treatment method thereof |
| CN101363073A (en) * | 2008-09-10 | 2009-02-11 | 江苏太平洋精密锻造有限公司 | Isothermal normalizing technology of carburized gears steel forging |
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2013
- 2013-07-29 CN CN2013103239611A patent/CN103468916A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008266762A (en) * | 2007-04-25 | 2008-11-06 | Aisin Seiki Co Ltd | Method for manufacturing metal material including carburizing treatment process |
| KR20090008554A (en) * | 2007-07-18 | 2009-01-22 | 셰플러코리아(유) | Steel for bearing having high resistance to the outer particles and the heat treatment method thereof |
| CN101265582A (en) * | 2008-04-30 | 2008-09-17 | 上海热处理厂有限公司 | 20CrMnMo energy-saving carburizing composite heat treating process |
| CN101363073A (en) * | 2008-09-10 | 2009-02-11 | 江苏太平洋精密锻造有限公司 | Isothermal normalizing technology of carburized gears steel forging |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480260A (en) * | 2014-12-25 | 2015-04-01 | 湖北新冶钢汽车零部件有限公司 | Isothermal normalizing furnaceburdentray |
| CN104480260B (en) * | 2014-12-25 | 2016-06-08 | 湖北新冶钢汽车零部件有限公司 | A kind of isothermal normalizing furnace charging tray |
| CN104962705A (en) * | 2015-07-29 | 2015-10-07 | 山东伊莱特重工有限公司 | Isothermal normalizing treatment technique of wind power flange |
| CN105239033A (en) * | 2015-11-10 | 2016-01-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Composite carburizing and quenching heat treatment method of gear |
| CN105349904A (en) * | 2015-11-10 | 2016-02-24 | 宁波市鸿博机械制造有限公司 | Preparation method of steel valve plug |
| CN105420615A (en) * | 2015-11-10 | 2016-03-23 | 宁波市鸿博机械制造有限公司 | Steel valve plug |
| CN105239033B (en) * | 2015-11-10 | 2017-08-08 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of Composite carburization quenching heat treatment method of gear |
| CN110343823A (en) * | 2019-07-31 | 2019-10-18 | 北京机电研究所有限公司 | A kind of isothermal normalizing heat treatment process |
| CN110343823B (en) * | 2019-07-31 | 2021-04-16 | 北京机电研究所有限公司 | Isothermal normalizing heat treatment process |
| CN111500834A (en) * | 2020-05-27 | 2020-08-07 | 江苏联峰实业有限公司 | Heat treatment process of gear steel for automobile gearbox |
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Application publication date: 20131225 |