CN104032116A - Thermal treatment process of steel bevel gear - Google Patents
Thermal treatment process of steel bevel gear Download PDFInfo
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- CN104032116A CN104032116A CN201410300131.1A CN201410300131A CN104032116A CN 104032116 A CN104032116 A CN 104032116A CN 201410300131 A CN201410300131 A CN 201410300131A CN 104032116 A CN104032116 A CN 104032116A
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Abstract
The invention relates to a thermal treatment process of a steel bevel gear. The process comprises the following steps: S1, unloading 12Cr2Ni4A steel; S2, carrying out advanced thermal treatment of a forging stock; S3, carrying out mechanical cutting and processing; S4, carrying out air cooling after carburization; S5, high-temperature tempering; S6, carrying out step hardening; S7, washing; S8, carrying out cold treatment; S9, carrying out low-temperature tempering; and S10, carrying out sand-blast cleaning. The thermal treatment process provided by the invention overcomes the condition that after the existing thermal treatment process, unstable tissue retained austenite is more. The depth of the carburized layer of the bevel gear prepared by the process is 0.85-1.05mm, the carbide is greater than or equal to level 5, the martensite is less than or equal to level 4, the retained austenite is less than or equal to level 3 and the hardness is greater than or equal to 61HRC.
Description
Technical field
The present invention relates to a kind of thermal treatment process of steel gear.
Background technology
Secondary quenching technique after steel gear many employing common gases carburizing in the past.Carburizing rear surface carbon concentration is 1.0% ~ 1.3%, when follow-up grinding, often there is netted or parallel streak flaw, and there is the defects such as pit in surface sometimes, after the reason that this defect produces is the cementation zone quenching that carbon content is higher, there is more retained austenite, this unsettled tissue changes the newborn martensite that stress is larger under high-speed grinding impact and pressure-acting, under the effect of the powerful tensile stress in surface and produce.
Summary of the invention
Technical problem to be solved by this invention is to provide the thermal treatment process of a kind of steel cone gear.Overcome the more situation of unstable tissue residue austenite after existing thermal treatment process; The case depth of using the cone gear of this technique manufacture is 0.85 ~ 1.05mm, carbide≤5 grade, martensite≤4 grade, retained austenite≤3 grade, hardness >=61HRC.
The present invention adopts following scheme: the thermal treatment process of a kind of steel cone gear, comprises following step:
Step 1, blanking: adopt 12Cr2Ni4A steel;
Step 2, forging stock conditioning heat treatment;
Step 3, mechanical cutting processing;
Air cooling after step 4, carburizing;
Step 5, high tempering;
Step 6, marquenching;
Step 7, cleaning;
Step 8, deepfreeze;
Step 9, low-temperaturetempering;
Step 10, sandblast cleaning.
Described forging stock conditioning heat treatment: 880 ~ 900 ℃, air cooling after insulation 70 ~ 90min; Air cooling after 640 ~ 680 ℃ of insulation 2h.
Described carburizing: gear is at room temperature with axle location (filling the cushion block of suitable thickness below each gear), whole extension is lifted in RQ3-75-9 gas carbruizing furance together, through 860 ~ 880 ℃, adding heat penetration burns after 60min, be warmed up to 900 ~ 910 ℃ insulation 90min, then be warmed up to 920 ℃ insulation 2 ~ 4h after air cooling.
Described high tempering: be heated to 640 ~ 680 ℃ in RJJ-36-6 tempering stove, and be incubated air cooling after 2h.
Described marquenching: gear is packed in tray, and with charcoal or the protection of new cast iron filing, in RX3-45-9 in temperature type resistance furnace 800 ~ 820 ℃ heat and be incubated 40 ~ 60min; After coming out of the stove, remove protection bits, tooth portion is upwards lain in the hanging box of wire netting, the melting salt made from earth containing a comparatively high percentage of sodium chloride that hangs in rapidly 160 ~ 220 ℃ is bathed interior cooling 7 ~ 12min, and air cooling is to room temperature.
Described deepfreeze: gear packs in the deepfreeze case that dry ice+alcohol is refrigeration agent after cleaning, keeps ging up to room temperature after 1 ~ 1.5h.
Described tempering: 180 ℃ of heating in resistance furnace, air cooling after insulation 2h.
Beneficial effect of the present invention:
The case depth of using the cone gear of this technique manufacture is 0.85 ~ 1.05mm, carbide≤5 grade, martensite≤4 grade, retained austenite≤3 grade, hardness >=61HRC.
12Cr2Ni4A steel belongs to the senior high duty alloy converted steel that hardening capacity is fabulous, and after carburizing, air cooling can harden, and heat treatment deformation susceptibility and superheated susceptivity all very little; Have that wear resistance is good, fatigue strength advantages of higher; After carburizing, in tissue, exist more unsettled retained austenite to make it change martensite into by deepfreeze, thereby further improve hardness and the wear resistance of gear, be conducive to stablize the precision of gear simultaneously.
Embodiment
A thermal treatment process for steel cone gear, comprises following step:
Step 1, blanking: adopt 12Cr2Ni4A steel;
Step 2, forging stock conditioning heat treatment;
Step 3, mechanical cutting processing;
Air cooling after step 4, carburizing;
Step 5, high tempering;
Step 6, marquenching;
Step 7, cleaning;
Step 8, deepfreeze;
Step 9, low-temperaturetempering;
Step 10, sandblast cleaning.
Described forging stock conditioning heat treatment: 880 ~ 900 ℃, air cooling after insulation 70 ~ 90min; Air cooling after 640 ~ 680 ℃ of insulation 2h.
Described carburizing: gear is at room temperature with axle location (filling the cushion block of suitable thickness below each gear), whole extension is lifted in RQ3-75-9 gas carbruizing furance together, through 860 ~ 880 ℃, adding heat penetration burns after 60min, be warmed up to 900 ~ 910 ℃ insulation 90min, then be warmed up to 920 ℃ insulation 2 ~ 4h after air cooling.
Described high tempering: be heated to 640 ~ 680 ℃ in RJJ-36-6 tempering stove, and be incubated air cooling after 2h.
Described marquenching: gear is packed in tray, and with charcoal or the protection of new cast iron filing, in RX3-45-9 in temperature type resistance furnace 800 ~ 820 ℃ heat and be incubated 40 ~ 60min; After coming out of the stove, remove protection bits, tooth portion is upwards lain in the hanging box of wire netting, the melting salt made from earth containing a comparatively high percentage of sodium chloride that hangs in rapidly 160 ~ 220 ℃ is bathed interior cooling 7 ~ 12min, and air cooling is to room temperature.
Described deepfreeze: gear packs in the deepfreeze case that dry ice+alcohol is refrigeration agent after cleaning, keeps ging up to room temperature after 1 ~ 1.5h.
Described tempering: 180 ℃ of heating in resistance furnace, air cooling after insulation 2h.
The thermal treatment process of steel cone gear of the present invention, has overcome the more situation of unstable tissue residue austenite after existing thermal treatment process; The case depth of using the cone gear of this technique manufacture is 0.85 ~ 1.05mm, carbide≤5 grade, martensite≤4 grade, retained austenite≤3 grade, hardness >=61HRC.
12Cr2Ni4A steel belongs to the senior high duty alloy converted steel that hardening capacity is fabulous, and after carburizing, air cooling can harden, and heat treatment deformation susceptibility and superheated susceptivity all very little; Have that wear resistance is good, fatigue strength advantages of higher; After carburizing, in tissue, exist more unsettled retained austenite to make it change martensite into by deepfreeze, thereby further improve hardness and the wear resistance of gear, be conducive to stablize the precision of gear simultaneously.
Claims (7)
1. a thermal treatment process for steel cone gear, is characterized in that, comprises following step:
Step 1, blanking: adopt 12Cr2Ni4A steel;
Step 2, forging stock conditioning heat treatment;
Step 3, mechanical cutting processing;
Air cooling after step 4, carburizing;
Step 5, high tempering;
Step 6, marquenching;
Step 7, cleaning;
Step 8, deepfreeze;
Step 9, low-temperaturetempering;
Step 10, sandblast cleaning.
2. the thermal treatment process of steel cone gear according to claim 1, is characterized in that, described forging stock conditioning heat treatment: 880 ~ 900 ℃, and air cooling after insulation 70 ~ 90min; Air cooling after 640 ~ 680 ℃ of insulation 2h.
3. the thermal treatment process of steel cone gear according to claim 1, it is characterized in that, described carburizing: gear is at room temperature with axle location (filling the cushion block of suitable thickness below each gear), whole extension is lifted in RQ3-75-9 gas carbruizing furance together, through 860 ~ 880 ℃, adding heat penetration burns after 60min, be warmed up to 900 ~ 910 ℃ insulation 90min, then be warmed up to 920 ℃ insulation 2 ~ 4h after air cooling.
4. the thermal treatment process of steel cone gear according to claim 1, is characterized in that, described high tempering: in RJJ-36-6 tempering stove, be heated to 640 ~ 680 ℃, and be incubated air cooling after 2h.
5. the thermal treatment process of steel cone gear according to claim 1, it is characterized in that, described marquenching: gear is packed in tray, and with charcoal or the protection of new cast iron filing, in RX3-45-9 in temperature type resistance furnace 800 ~ 820 ℃ heat and be incubated 40 ~ 60min; After coming out of the stove, remove protection bits, tooth portion is upwards lain in the hanging box of wire netting, the melting salt made from earth containing a comparatively high percentage of sodium chloride that hangs in rapidly 160 ~ 220 ℃ is bathed interior cooling 7 ~ 12min, and air cooling is to room temperature.
6. the thermal treatment process of steel cone gear according to claim 1, is characterized in that, described deepfreeze: gear packs in the deepfreeze case that dry ice+alcohol is refrigeration agent after cleaning, and keeps ging up to room temperature after 1 ~ 1.5h.
7. the thermal treatment process of steel cone gear according to claim 1, is characterized in that, described tempering: 180 ℃ of heating in resistance furnace, air cooling after insulation 2h.
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| CN201410300131.1A CN104032116A (en) | 2014-06-30 | 2014-06-30 | Thermal treatment process of steel bevel gear |
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| CN201410300131.1A CN104032116A (en) | 2014-06-30 | 2014-06-30 | Thermal treatment process of steel bevel gear |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357642A (en) * | 2014-10-27 | 2015-02-18 | 无锡乐华自动化科技有限公司 | Heat processing technology for high-carbon steel bevel gear |
| CN104498696A (en) * | 2014-12-15 | 2015-04-08 | 中国南方航空工业(集团)有限公司 | Heat treatment method of gear parts |
| CN104673975A (en) * | 2015-01-30 | 2015-06-03 | 南通弘峰机电有限公司 | Processing technology of high-carbon steel gear for ship |
| CN104805267A (en) * | 2015-04-28 | 2015-07-29 | 柳州科尔特锻造机械有限公司 | Heat treatment process of gear |
| CN104894573A (en) * | 2015-05-11 | 2015-09-09 | 柳州金盾机械有限公司 | Method for carburizing and quenching of cylindrical gear |
| CN108441619A (en) * | 2018-04-08 | 2018-08-24 | 何盼 | A kind of ring gear quenching technology |
| CN108468014A (en) * | 2018-04-16 | 2018-08-31 | 岭南师范学院 | A kind of heat treatment method that tool steel surface carburizing is modified |
| CN109385596A (en) * | 2018-11-27 | 2019-02-26 | 中国航发贵州黎阳航空动力有限公司 | A kind of 12Cr2Ni4A material gas carburization quenching method |
| CN109628726A (en) * | 2017-10-09 | 2019-04-16 | 徐州东鹏工具制造有限公司 | A kind of heat treatment process of gear |
| CN110791640A (en) * | 2019-11-27 | 2020-02-14 | 南京工程学院 | High-temperature carburization gear composite preparatory heat treatment process |
| CN110846472A (en) * | 2019-11-27 | 2020-02-28 | 中国航发中传机械有限公司 | Heat treatment method for controlling hardness and deformation of low-carbon alloy steel gear |
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| CN103223577A (en) * | 2013-05-03 | 2013-07-31 | 天津市天瑞硬化工程有限公司 | Anti-fatigue manufacturing method of spiral bevel gear |
| CN103290419A (en) * | 2013-06-25 | 2013-09-11 | 清华大学 | Gear treatment method |
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| CN1227876A (en) * | 1998-03-03 | 1999-09-08 | 张自国 | Technique for increasing service life of carburizing gear |
| CN102605378A (en) * | 2012-01-13 | 2012-07-25 | 浙江吉利汽车研究院有限公司 | Carburizing and quenching method |
| CN103223577A (en) * | 2013-05-03 | 2013-07-31 | 天津市天瑞硬化工程有限公司 | Anti-fatigue manufacturing method of spiral bevel gear |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357642A (en) * | 2014-10-27 | 2015-02-18 | 无锡乐华自动化科技有限公司 | Heat processing technology for high-carbon steel bevel gear |
| CN104498696A (en) * | 2014-12-15 | 2015-04-08 | 中国南方航空工业(集团)有限公司 | Heat treatment method of gear parts |
| CN104498696B (en) * | 2014-12-15 | 2016-09-21 | 中国南方航空工业(集团)有限公司 | The heat treatment method of tooth class part |
| CN104673975A (en) * | 2015-01-30 | 2015-06-03 | 南通弘峰机电有限公司 | Processing technology of high-carbon steel gear for ship |
| CN104805267A (en) * | 2015-04-28 | 2015-07-29 | 柳州科尔特锻造机械有限公司 | Heat treatment process of gear |
| CN104894573A (en) * | 2015-05-11 | 2015-09-09 | 柳州金盾机械有限公司 | Method for carburizing and quenching of cylindrical gear |
| CN109628726A (en) * | 2017-10-09 | 2019-04-16 | 徐州东鹏工具制造有限公司 | A kind of heat treatment process of gear |
| CN108441619A (en) * | 2018-04-08 | 2018-08-24 | 何盼 | A kind of ring gear quenching technology |
| CN108468014A (en) * | 2018-04-16 | 2018-08-31 | 岭南师范学院 | A kind of heat treatment method that tool steel surface carburizing is modified |
| CN109385596A (en) * | 2018-11-27 | 2019-02-26 | 中国航发贵州黎阳航空动力有限公司 | A kind of 12Cr2Ni4A material gas carburization quenching method |
| CN110791640A (en) * | 2019-11-27 | 2020-02-14 | 南京工程学院 | High-temperature carburization gear composite preparatory heat treatment process |
| CN110846472A (en) * | 2019-11-27 | 2020-02-28 | 中国航发中传机械有限公司 | Heat treatment method for controlling hardness and deformation of low-carbon alloy steel gear |
| CN110791640B (en) * | 2019-11-27 | 2021-06-29 | 南京工程学院 | High-temperature carburization gear composite preparatory heat treatment process |
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Application publication date: 20140910 |