CN104357796A - Carburizing and quenching process of automobile gear - Google Patents
Carburizing and quenching process of automobile gear Download PDFInfo
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- CN104357796A CN104357796A CN201410682009.5A CN201410682009A CN104357796A CN 104357796 A CN104357796 A CN 104357796A CN 201410682009 A CN201410682009 A CN 201410682009A CN 104357796 A CN104357796 A CN 104357796A
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- kerosene
- automobile gear
- carburizing
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- 238000010791 quenching Methods 0.000 title claims abstract description 36
- 238000005255 carburizing Methods 0.000 title claims abstract description 35
- 230000000171 quenching effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 21
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 72
- 239000003350 kerosene Substances 0.000 claims description 48
- 229910052799 carbon Inorganic materials 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 238000009413 insulation Methods 0.000 claims description 16
- 238000009792 diffusion process Methods 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 230000002045 lasting effect Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 230000003245 working effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention provides a carburizing and quenching process of an automobile gear. By adopting a pit-type gas carburizing furnace to perform carburizing treatment on the automobile gear, the carburizing and quenching process comprises the following steps: a) performing primary preheating, namely, gradually raising the temperature in the furnace to 880 +/-5 DEG C and then putting the automobile gear in the furnace, gradually reducing the temperature in the furnace to 750 +/-5 DEG C, preserving the heat for 30 minutes. The carburizing and quenching process of the automobile gear disclosed by the invention adopts a manner of repeatedly preheating and diffusing, so that the depth of an effective carburizing layer of the automobile gear is 1.1-1.2mm after carburizing to obtain a finished product, and the surface hardness is 58-62HRC, and therefore, the wear resistance, the strength and the fatigue limit of the components are improved, and the mechanical performances of the gear material are sufficiently brought into play. Moreover, distortions such as diameters changes, uneven changes in an addendum circle and an inner hole, plane warpage as well as dimension changes between gears are not produced, so that the reliability and the service life of the automobile gear are guaranteed.
Description
Technical field
The present invention relates to technical field of heat treatment, particularly relate to a kind of carburizing quenching process of automobile gear.
Background technology
Thermal treatment process refers to the whole process of part heat treatment operation, complete thermal treatment process, not only can be high-quality and efficient produce qualified product, improve the service life of product, and can production cost be reduced, improve the benefit of enterprise.
Thermo-chemical treatment is the Technology that surface alloying is combined with heat treatment phase, it is that active media metal or alloy workpiece being placed in certain temperature is incubated, that one or several elements infiltrate in workpiece surface, be equipped with different subsequent heat treatment, surface strengthening is realized by surface alloying, in raising surface strength, hardness, while the performance such as wear-resisting, keep the obdurability in heart portion, that product has higher comprehensive mechanical property, wherein carburizing is carbon content in order to increase steel part top layer and certain carbon profile, steel part is heated in carburizing medium and is incubated, carbon atom is made to infiltrate the chemical heat treatment process on top layer.Quenching after carbunse tempering, can make piece surface hardness improve, wear-resisting, and good core toughness.
Automobile gear can change interior tissue by carburizing quenching process, improve the wear resistance of part, intensity and safe range of stress, give full play to the mechanical property of gear material, improve stability and the work-ing life of automobile gear, traditional carburizing quenching process for automobile gear, the distortion such as the change of such as diameter, the uneven change of point circle and endoporus, plane warping and between cog dimensional change can be produced after gear finished product, this badly influences the mechanical property of automobile gear, even causes scrapping of gear.
Summary of the invention
The technical problem to be solved in the present invention is: in order to solve in prior art producing the distortion such as the change of such as diameter, the uneven change of point circle and endoporus, plane warping and between cog dimensional change after carburizing after the carburization process finished product of automobile gear, this badly influences the mechanical property of automobile gear, even cause the problem of scrapping of gear, the carburizing quenching process that the invention provides a kind of automobile gear solves the problems referred to above.
The technical solution adopted for the present invention to solve the technical problems is: a kind of carburizing quenching process of automobile gear, uses pit gas carburizing furnace to carry out carburizing treatment to automobile tooth, comprises the following steps:
A) one-level preheating: after the temperature in stove is risen to 880 ± 5 DEG C gradually, automobile gear is positioned in stove, in-furnace temperature is dropped to 750 ± 5 DEG C, insulation 30min;
B) secondary preheating: in 80min, in-furnace temperature is risen to 910 ± 5 DEG C gradually, in 80min, continue instillation methyl alcohol, the amount of dripping methyl alcohol is 170 ± 5/min, and continue to drip kerosene in the rear 30min of 80min, the amount of dripping kerosene is 170 ± 5/min;
C) be vented: in 35min by furnace air emptying and lasting kerosene, the amount of dripping kerosene is 185 ± 5/min;
D) ooze by force: in-furnace temperature is risen to 920 ± 5 DEG C, carbon potential is 1.2%Cp, and furnace pressure is 15 ~ 20Pa, and insulation 100 ± 10min also drips kerosene, and the amount of dripping kerosene is 35/min;
E) one-level diffusion: in-furnace temperature is down to 900 ± 5 DEG C, carbon potential is 1.03%Cp, and furnace pressure is 10 ~ 15Pa, insulation 80 ± 5min also drips kerosene, and the amount of dripping kerosene is 28/min;
F) secondary diffusion: in-furnace temperature is down to 880 ± 5 DEG C, carbon potential is 0.82%Cp, and furnace pressure is 10 ~ 15Pa, insulation 60 ± 5min also drips kerosene, and the amount of dripping kerosene is 22/min;
G) precooling: in-furnace temperature be down to gradually 850 ± 5 DEG C in 100min and drip methyl alcohol and kerosene, the amount of dripping kerosene is 15/min, and the amount of dripping methyl alcohol is 25/min, carbon potential is 0.8%Cp, furnace pressure is 10 ~ 15Pa, then is incubated 50min and drips methyl alcohol, and the amount of dripping methyl alcohol is 25/min;
H) quench: come out of the stove by automobile gear and carry out oil quenching, the temperature of quenching oil controls at 70 ± 5 DEG C;
I) clean: the oil stain removing automobile gear surface, rinse liquid temperature controls at 65 ± 5 DEG C;
J) tempering: carry out low-temperaturetempering, control in-furnace temperature 165 ± 5 DEG C, the time is 80 ~ 100min;
K) cool: automobile gear is taken out from stove and carries out air cooling.
As preferably, in described step I) automobile gear is placed in the environment of 75 ± 10 DEG C after cleaning dry.
As preferably, described quenching oil is quick bright quenc hing oil.
The invention has the beneficial effects as follows, the carburizing quenching process of this automobile gear adopts the mode repeating preheating and diffusion, automobile gear effective case depth after carburizing finished product is made to reach 1.1 ~ 1.2mm, surface hardness is 58 ~ 62HRC, improve the wear resistance of part, intensity and safe range of stress, give full play to the mechanical property of gear material, and do not produce the distortion such as the change of such as diameter, the uneven change of point circle and endoporus, plane warping and between cog dimensional change, ensure that reliability and the work-ing life of automobile gear.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the process curve figure of the optimum embodiment of the carburizing quenching process of automobile gear of the present invention.
Embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
The invention provides a kind of carburizing quenching process of automobile gear, use pit gas carburizing furnace to carry out carburizing treatment to the transmission gear in automobile gearbox, material is 20CrMnTi, comprises the following steps:
A) one-level preheating: after the temperature in stove is risen to 880 ± 5 DEG C gradually, automobile gear is positioned in stove, in-furnace temperature is dropped to 750 ± 5 DEG C, insulation 30min;
B) secondary preheating: in 80min, in-furnace temperature is risen to 910 ± 5 DEG C gradually, in 80min, continue instillation methyl alcohol, the amount of dripping methyl alcohol is 170 ± 5/min, and continue to drip kerosene in the rear 30min of 80min, the amount of dripping kerosene is 170 ± 5/min;
C) be vented: in 35min by furnace air emptying and lasting kerosene, the amount of dripping kerosene is 185 ± 5/min;
D) ooze by force: in-furnace temperature is risen to 920 ± 5 DEG C, carbon potential is 1.2%Cp, and furnace pressure is 15 ~ 20Pa, and insulation 100 ± 10min also drips kerosene, and the amount of dripping kerosene is 35/min;
E) one-level diffusion: in-furnace temperature is down to 900 ± 5 DEG C, carbon potential is 1.03%Cp, and furnace pressure is 10 ~ 15Pa, insulation 80 ± 5min also drips kerosene, and the amount of dripping kerosene is 28/min;
F) secondary diffusion: in-furnace temperature is down to 880 ± 5 DEG C, carbon potential is 0.82%Cp, and furnace pressure is 10 ~ 15Pa, insulation 60 ± 5min also drips kerosene, and the amount of dripping kerosene is 22/min;
G) precooling: in-furnace temperature be down to gradually 850 ± 5 DEG C in 100min and drip methyl alcohol and kerosene, the amount of dripping kerosene is 15/min, and the amount of dripping methyl alcohol is 25/min, carbon potential is 0.8%Cp, furnace pressure is 10 ~ 15Pa, then is incubated 50min and drips methyl alcohol, and the amount of dripping methyl alcohol is 25/min;
H) quench: come out of the stove by automobile gear and carry out oil quenching, the temperature of quenching oil controls at 70 ± 5 DEG C;
I) clean: the oil stain removing automobile gear surface, rinse liquid temperature controls at 65 ± 5 DEG C;
J) tempering: carry out low-temperaturetempering, control in-furnace temperature 165 ± 5 DEG C, the time is 80 ~ 100min;
K) cool: automobile gear is taken out from stove and carries out air cooling.
In described step I) automobile gear is placed in the environment of 75 ± 10 DEG C after cleaning dry, described quenching oil is quick bright quenc hing oil.
The carburizing quenching process of this automobile gear adopts the mode repeating preheating and diffusion, automobile gear effective case depth after carburizing finished product is made to reach 1.1 ~ 1.2mm, surface hardness is 58 ~ 62HRC, improve the wear resistance of part, intensity and safe range of stress, give full play to the mechanical property of gear material, and do not produce the distortion such as the change of such as diameter, the uneven change of point circle and endoporus, plane warping and between cog dimensional change, ensure that reliability and the work-ing life of automobile gear.
In order to further illustrate technical scheme of the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
Embodiment
Use pit gas carburizing furnace to carry out carburizing treatment to the transmission gear in automobile gearbox, material is 20CrMnTi, as shown in Figure 1, comprises the following steps:
A) one-level preheating: after the temperature in stove is risen to 880 DEG C gradually, automobile gear is positioned in stove, in-furnace temperature is dropped to 750 DEG C, insulation 30min;
B) secondary preheating: in 80min, in-furnace temperature is risen to 910 DEG C gradually, in 80min, continue instillation methyl alcohol, the amount of dripping methyl alcohol is 170/min, and continue to drip kerosene in the rear 30min of 80min, the amount of dripping kerosene is 170/min;
C) be vented: in 35min by furnace air emptying and lasting kerosene, the amount of dripping kerosene is 185/min;
D) ooze by force: in-furnace temperature is risen to 920 DEG C, carbon potential is 1.2%Cp, and furnace pressure is 15 ~ 20Pa, and insulation 100min also drips kerosene, and the amount of dripping kerosene is 35/min;
E) one-level diffusion: in-furnace temperature is down to 900 DEG C, carbon potential is 1.03%Cp, and furnace pressure is 10 ~ 15Pa, insulation 80min also drips kerosene, and the amount of dripping kerosene is 28/min;
F) secondary diffusion: in-furnace temperature is down to 880 DEG C, carbon potential is 0.82%Cp, and furnace pressure is 10 ~ 15Pa, insulation 60min also drips kerosene, and the amount of dripping kerosene is 22/min;
G) precooling: in-furnace temperature be down to gradually 850 DEG C in 100min and drip methyl alcohol and kerosene, the amount of dripping kerosene is 15/min, and the amount of dripping methyl alcohol is 25/min, carbon potential is 0.8%Cp, furnace pressure is 10 ~ 15Pa, then is incubated 50min and drips methyl alcohol, and the amount of dripping methyl alcohol is 25/min;
H) quench: come out of the stove by automobile gear and carry out oil quenching, the temperature of quenching oil controls at 70 DEG C;
I) clean: the oil stain removing automobile gear surface, rinse liquid temperature controls at 65 DEG C;
I ') automobile gear is placed in the environment of 75 DEG C dry;
J) tempering: carry out low-temperaturetempering, control in-furnace temperature 165 DEG C, the time is 90min;
K) cool: automobile gear is taken out from stove and carries out air cooling.
Carry out performance measurement to the automobile gear after the present embodiment carburizing treatment, wherein the degree of depth reaches 1.1mm, and surface hardness is 61.2HRC, and it is 0.03mm that endoporus loses circle, and flank of tooth cydariform amount is 0.01, illustrates that distortion degree is minimum, laminating production requirement.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification sheets, must determine its technical scope according to right.
Claims (3)
1. a carburizing quenching process for automobile gear, is characterized in that: use pit gas carburizing furnace to carry out carburizing treatment to automobile tooth, comprise the following steps:
A) one-level preheating: after the temperature in stove is risen to 880 ± 5 DEG C gradually, automobile gear is positioned in stove, in-furnace temperature is dropped to 750 ± 5 DEG C, insulation 30min;
B) secondary preheating: in 80min, in-furnace temperature is risen to 910 ± 5 DEG C gradually, in 80min, continue instillation methyl alcohol, the amount of dripping methyl alcohol is 170 ± 5/min, and continue to drip kerosene in the rear 30min of 80min, the amount of dripping kerosene is 170 ± 5/min;
C) be vented: in 35min by furnace air emptying and lasting kerosene, the amount of dripping kerosene is 185 ± 5/min;
D) ooze by force: in-furnace temperature is risen to 920 ± 5 DEG C, carbon potential is 1.2%Cp, and furnace pressure is 15 ~ 20Pa, and insulation 100 ± 10min also drips kerosene, and the amount of dripping kerosene is 35/min;
E) one-level diffusion: in-furnace temperature is down to 900 ± 5 DEG C, carbon potential is 1.03%Cp, and furnace pressure is 10 ~ 15Pa, insulation 80 ± 5min also drips kerosene, and the amount of dripping kerosene is 28/min;
F) secondary diffusion: in-furnace temperature is down to 880 ± 5 DEG C, carbon potential is 0.82%Cp, and furnace pressure is 10 ~ 15Pa, insulation 60 ± 5min also drips kerosene, and the amount of dripping kerosene is 22/min;
G) precooling: in-furnace temperature be down to gradually 850 ± 5 DEG C in 100min and drip methyl alcohol and kerosene, the amount of dripping kerosene is 15/min, and the amount of dripping methyl alcohol is 25/min, carbon potential is 0.8%Cp, furnace pressure is 10 ~ 15Pa, then is incubated 50min and drips methyl alcohol, and the amount of dripping methyl alcohol is 25/min;
H) quench: come out of the stove by automobile gear and carry out oil quenching, the temperature of quenching oil controls at 70 ± 5 DEG C;
I) clean: the oil stain removing automobile gear surface, rinse liquid temperature controls at 65 ± 5 DEG C;
J) tempering: carry out low-temperaturetempering, control in-furnace temperature 165 ± 5 DEG C, the time is 80 ~ 100min;
K) cool: automobile gear is taken out from stove and carries out air cooling.
2. the carburizing quenching process of automobile gear as claimed in claim 1, is characterized in that: in described step I) automobile gear is placed at after cleaning in the environment of 75 ± 10 DEG C dry.
3. the carburizing quenching process of automobile gear as claimed in claim 1, is characterized in that: described quenching oil is quick bright quenc hing oil.
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| CN201410682009.5A CN104357796B (en) | 2014-11-24 | 2014-11-24 | The carburizing quenching process of automobile gear |
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| CN201410682009.5A CN104357796B (en) | 2014-11-24 | 2014-11-24 | The carburizing quenching process of automobile gear |
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| CN104357796B CN104357796B (en) | 2016-11-23 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805271A (en) * | 2015-04-28 | 2015-07-29 | 柳州科尔特锻造机械有限公司 | Heat treatment process for automobile gears |
| CN104831291A (en) * | 2015-05-11 | 2015-08-12 | 吴芳吉 | Carburization process for automobile hub |
| CN104831290A (en) * | 2015-05-11 | 2015-08-12 | 柳州金盾机械有限公司 | Carburizing and quenching process of straight-tooth cylindrical gear |
| CN104962700A (en) * | 2015-06-17 | 2015-10-07 | 柳州金特新型耐磨材料股份有限公司 | Wear-resistant material quenching process |
| CN105154633A (en) * | 2015-10-26 | 2015-12-16 | 江苏保捷锻压有限公司 | Rapid carburizing heat treatment technology of driving gear for automobile differential mechanism |
| CN105483603A (en) * | 2015-12-10 | 2016-04-13 | 常州天山重工机械有限公司 | Thermal treatment process for hardness gradient of shallow deep carburized gear |
| CN105506539A (en) * | 2015-12-10 | 2016-04-20 | 常州天山重工机械有限公司 | Carburizing and quenching process of high-hardness micro carbide on surface of carburizing part |
| CN106756753A (en) * | 2016-12-12 | 2017-05-31 | 中车戚墅堰机车车辆工艺研究所有限公司 | The carburization quenching method of low-speed heavy-loaded gear |
| CN106756754A (en) * | 2016-12-12 | 2017-05-31 | 中车戚墅堰机车车辆工艺研究所有限公司 | The carburization quenching method of automobile gearbox gear |
| CN107356622A (en) * | 2017-05-16 | 2017-11-17 | 沈阳透平机械股份有限公司 | A kind of distortion sample for the test of carburizing and quenching gear deflection |
| CN111394686A (en) * | 2020-04-03 | 2020-07-10 | 南阳浩帆车辆部件有限公司 | Heat treatment method of small module gear |
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| JP2006097096A (en) * | 2004-09-29 | 2006-04-13 | Daido Steel Co Ltd | Bearing steel component subjected to carburizing or carbonitriding |
| CN102154652A (en) * | 2011-03-11 | 2011-08-17 | 江苏南方轴承股份有限公司 | Medium-deep-layer carburization or carbonitriding thermal processing technology for bearings or clutch parts |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805271A (en) * | 2015-04-28 | 2015-07-29 | 柳州科尔特锻造机械有限公司 | Heat treatment process for automobile gears |
| CN104831291A (en) * | 2015-05-11 | 2015-08-12 | 吴芳吉 | Carburization process for automobile hub |
| CN104831290A (en) * | 2015-05-11 | 2015-08-12 | 柳州金盾机械有限公司 | Carburizing and quenching process of straight-tooth cylindrical gear |
| CN104962700A (en) * | 2015-06-17 | 2015-10-07 | 柳州金特新型耐磨材料股份有限公司 | Wear-resistant material quenching process |
| CN105154633A (en) * | 2015-10-26 | 2015-12-16 | 江苏保捷锻压有限公司 | Rapid carburizing heat treatment technology of driving gear for automobile differential mechanism |
| CN105154633B (en) * | 2015-10-26 | 2018-05-29 | 江苏保捷锻压有限公司 | A kind of rapid carburization heat treatment process of automobile differential drive gear |
| CN105506539A (en) * | 2015-12-10 | 2016-04-20 | 常州天山重工机械有限公司 | Carburizing and quenching process of high-hardness micro carbide on surface of carburizing part |
| CN105483603B (en) * | 2015-12-10 | 2018-02-16 | 常州天山重工机械有限公司 | A kind of Technology for Heating Processing of shallow-layer deep cementing gear hardness gradient |
| CN105483603A (en) * | 2015-12-10 | 2016-04-13 | 常州天山重工机械有限公司 | Thermal treatment process for hardness gradient of shallow deep carburized gear |
| CN106756753A (en) * | 2016-12-12 | 2017-05-31 | 中车戚墅堰机车车辆工艺研究所有限公司 | The carburization quenching method of low-speed heavy-loaded gear |
| CN106756754A (en) * | 2016-12-12 | 2017-05-31 | 中车戚墅堰机车车辆工艺研究所有限公司 | The carburization quenching method of automobile gearbox gear |
| CN106756753B (en) * | 2016-12-12 | 2018-10-02 | 中车戚墅堰机车车辆工艺研究所有限公司 | The carburization quenching method of low-speed heavy-loaded gear |
| CN106756754B (en) * | 2016-12-12 | 2019-09-27 | 中车戚墅堰机车车辆工艺研究所有限公司 | The carburization quenching method of automobile gearbox gear |
| CN107356622A (en) * | 2017-05-16 | 2017-11-17 | 沈阳透平机械股份有限公司 | A kind of distortion sample for the test of carburizing and quenching gear deflection |
| CN111394686A (en) * | 2020-04-03 | 2020-07-10 | 南阳浩帆车辆部件有限公司 | Heat treatment method of small module gear |
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|---|---|
| CN104357796B (en) | 2016-11-23 |
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