CN104120378A - Gear production process facilitating gear surface quality - Google Patents
Gear production process facilitating gear surface quality Download PDFInfo
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- CN104120378A CN104120378A CN201410354590.8A CN201410354590A CN104120378A CN 104120378 A CN104120378 A CN 104120378A CN 201410354590 A CN201410354590 A CN 201410354590A CN 104120378 A CN104120378 A CN 104120378A
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Abstract
The invention discloses a gear production process facilitating gear surface quality. The gear production process comprises the bar blanking, the cutting, the heat treatment, the fine cutting and the grinding performed in sequence; the material of a bar is 20CrMnTiH; the heat treatment comprises the following steps: when a blank obtained by the cutting is heated to 830-920 DEG C, the carburizing treatment is performed; and in the carburizing treatment, the temperature keeping time is not lower than 3 h; the slow cooling is performed after the carburizing treatment; when the blank is slowly cooled not higher than 550 DEG C, the secondary heating is performed, and the insulation is performed not lower than 2 h; then, the quenching is performed; the quenched blank is heated for the third time to 170-200 DEG C; the insulation is performed not lower than 3 h; then, the tempering is performed; the blank is heated to 840-870 DEG C in the secondary heating; and the carburizing treatment comprises the preheating phase, the strong carburizing phase and the dispersing phase performed in sequence. The process is simple in steps, and is convenient to obtain a gear with differently released surface hardened layer and proper impact resistance, wear resistance and strength.
Description
Technical field
The present invention relates to the drive disk assembly manufacturing process for transmission of torque, particularly relate to a kind of Gear Production technique that is conducive to gear surface quality.
Background technology
Gear is the key part in mechanical means, and the quality of gear quality is directly connected to the work-ing life of whole equipment.And the quality of gear quality depends on gear material and thermal treatment process thereof to a great extent.Therefore, the domestic and international producer relevant to gear manufacture all very payes attention to the research and development of gear material and heat treatment technics thereof.
The material of prior art middle gear is selected the generally stressed and Working environment in transmission system according to gear, and thermal treatment process is that the corrosion resistance that ensures gear surface thin hardened layer, gear surface and centre hardness, gear meets the means of processing requirement.The higher grade of product martensite metallographic that the thermal treatment that is 20CrMnTiH gear for material in prior art obtains, in use very easily there is under external force work hardening in the gear obtaining like this, cause gear within a short period of time upper layer disengaging to occur, have a strong impact on gear-driven stability and work-ing life.
Summary of the invention
The higher grade of product martensite metallographic obtaining for the thermal treatment that is 20CrMnTiH gear for material in above-mentioned prior art, in use very easily there is under external force work hardening in the gear obtaining like this, causing gear that upper layer occurs within a short period of time departs from, have a strong impact on the problem in gear-driven stability and work-ing life, the invention provides a kind of Gear Production technique that is conducive to gear surface quality.
For the problems referred to above, a kind of Gear Production technique that is conducive to gear surface quality provided by the invention reaches goal of the invention by following technical essential: a kind of Gear Production technique that is conducive to gear surface quality, comprise bar blank in sequence, machining, thermal treatment, essence cutting and ground finish, the material of described bar is 20CrMnTiH, described thermal treatment comprises that the blank that machining is obtained is heated to 830-920 DEG C and carries out carburizing treatment, and in carburizing treatment, above temperature hold-time is no less than 3h, after carburizing treatment, carry out Slow cooling, blank Slow cooling heats for the second time when not higher than 550 DEG C and is incubated after being no less than 2h and quenches, blank after quenching is heated to 170-200 DEG C and insulation to be for the third time no less than 3h and to carry out tempering, describedly be heated to be blank is heated to 840-870 DEG C for the second time, described carburizing treatment comprises the pre-heating stage successively carrying out, surging carburizing stage and diffusion phase,
Described pre-heating stage is blank to be placed in to methyl alcohol and the propane gas hot 20-30min altogether of 830-860 DEG C, the described surging carburizing stage is warming up to 875-920 DEG C by the blank of above-mentioned pre-heating stage, methyl alcohol and propane gas environment and keeps 2-3h, and control the magnitude of recruitment of methyl alcohol and propane gas, maintain carbon potential and remain 1.0-1.15%, described diffusion phase is to 830-880 DEG C of maintenance 1.5-2h by the blank in surging carburizing stage, methyl alcohol and propane gas environment temperature reduction, and control the magnitude of recruitment of methyl alcohol and propane gas, maintain carbon potential and remain 0.7-0.75%.
Further technical scheme is:
Between described machining and thermal treatment, also comprise oil removing cleaning step.
Described oil removing cleaning step is that to adopt temperature be the oil-removing cleaning agent of 50-65 DEG C is no less than 30min immersion treatment to blank.
Between described thermal treatment and essence cutting, also comprise the shot peening that is no less than 15min.
Described Slow cooling is that stove is cold.
Heating for the second time to blank is also incubated blank and is arranged in restitutive protection's atmosphere surrounding.
To blank heat for the second time and be incubated after quenching be oil cooling.
Between described oil cooling and tempering step, also comprise cleaning step.
The present invention has following beneficial effect:
1, ring gauge manufacturing approach craft provided by the invention is simple, the energy consumption of thermal treatment process only has more 20% compared to prior art, but the metallographic structure crystal grain of final gear product has obtained refinement, gear product martensitic stucture metallographic grade is 3, adopt gear martensitic stucture metallographic grade that this material obtains 2-3 the grade that declined compared to prior art, simultaneously, by above thermal treatment process, the gear surface hardness obtaining remains on 59-60HRC, it is upper that centre hardness grade remains on 35-36HRC, and case-hardening layer thickness is 1.2-1.4mm.Above product gear parameter make gear in use cementation zone be difficult for disengagings, gear impact resistance, wear resistance and intensity suitable, be equal 5-7 times of adopting gear that existing thermal treatment process obtains the work-ing life of gear.
2, this operational path adopts carburizing treatment temperature parameter and each time length in stage, be convenient to realize that residual austenite content after the enough hardening capacity of blank, little superheated susceptivity, good carburizing ability, thermal treatment is few, carburizing and quenching deflection is little.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples.
Embodiment 1:
A kind of Gear Production technique that is conducive to gear surface quality, comprise bar blank in sequence, machining, thermal treatment, essence cutting and ground finish, the material of described bar is 20CrMnTiH, described thermal treatment comprises that the blank that machining is obtained is heated to 830-920 DEG C and carries out carburizing treatment, and in carburizing treatment, above temperature hold-time is no less than 3h, after carburizing treatment, carry out Slow cooling, blank Slow cooling heats for the second time when not higher than 550 DEG C and is incubated after being no less than 2h and quenches, blank after quenching is heated to 170-200 DEG C and insulation to be for the third time no less than 3h and to carry out tempering, describedly be heated to be blank is heated to 840-870 DEG C for the second time, described carburizing treatment comprises the pre-heating stage successively carrying out, surging carburizing stage and diffusion phase,
Described pre-heating stage is blank to be placed in to methyl alcohol and the propane gas hot 20-30min altogether of 830-860 DEG C, the described surging carburizing stage is warming up to 875-920 DEG C by the blank of above-mentioned pre-heating stage, methyl alcohol and propane gas environment and keeps 2-3h, and control the magnitude of recruitment of methyl alcohol and propane gas, maintain carbon potential and remain 1.0-1.15%, described diffusion phase is to 830-880 DEG C of maintenance 1.5-2h by the blank in surging carburizing stage, methyl alcohol and propane gas environment temperature reduction, and control the magnitude of recruitment of methyl alcohol and propane gas, maintain carbon potential and remain 0.7-0.75%.
Ring gauge manufacturing approach craft provided by the invention is simple, the energy consumption of thermal treatment process only has more 20% compared to prior art, but the metallographic structure crystal grain of final gear product has obtained refinement, gear product martensitic stucture metallographic grade is 3, adopt gear martensitic stucture metallographic grade that this material obtains 2-3 the grade that declined compared to prior art, simultaneously, by above thermal treatment process, the gear surface hardness obtaining remains on 59-60HRC, it is upper that centre hardness grade remains on 35-36HRC, and case-hardening layer thickness is 1.2-1.4mm.Above product gear parameter make gear in use cementation zone be difficult for disengagings, gear impact resistance, wear resistance and intensity suitable, be equal 5-7 times of adopting gear that existing thermal treatment process obtains the work-ing life of gear.
The carburizing treatment temperature parameter that this operational path adopts and each time length in stage, be convenient to realize that residual austenite content after the enough hardening capacity of blank, little superheated susceptivity, good carburizing ability, thermal treatment is few, carburizing and quenching deflection is little.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1, for the oil pollution that in operational path between elimination machining, mechanical means or environment cause blank, avoid greasy dirt to affect thermal effectiveness, between described machining and thermal treatment, also comprise oil removing cleaning step.
For obtaining good oil removing cleaning performance and cleaning efficiency, described oil removing cleaning step is that to adopt temperature be the oil-removing cleaning agent of 50-65 DEG C is no less than 30min immersion treatment to blank.
For further strengthening the surface quality of product, between described thermal treatment and essence cutting, also comprise the shot peening that is no less than 15min.
For preventing that in process of cooling, oxidizing gas etc. impacts the surface of blank, described Slow cooling is that stove is cold.Further, the heating for the second time to blank be incubated blank and be arranged in restitutive protection's atmosphere surrounding.Further, blank is heated for the second time and be incubated after quenching be oil cooling.
For avoiding tempering effect to be subject to the impact of other factors, between described oil cooling and tempering step, also comprise cleaning step.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, not departing from other embodiments that draw under technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (8)
1. one kind is conducive to the Gear Production technique of gear surface quality, comprise bar blank in sequence, machining, thermal treatment, essence cutting and ground finish, it is characterized in that, the material of described bar is 20CrMnTiH, described thermal treatment comprises that the blank that machining is obtained is heated to 830-920 DEG C and carries out carburizing treatment, and in carburizing treatment, above temperature hold-time is no less than 3h, after carburizing treatment, carry out Slow cooling, blank Slow cooling heats for the second time when not higher than 550 DEG C and is incubated after being no less than 2h and quenches, blank after quenching is heated to 170-200 DEG C and insulation to be for the third time no less than 3h and to carry out tempering, describedly be heated to be blank is heated to 840-870 DEG C for the second time, described carburizing treatment comprises the pre-heating stage successively carrying out, surging carburizing stage and diffusion phase,
Described pre-heating stage is blank to be placed in to methyl alcohol and the propane gas hot 20-30min altogether of 830-860 DEG C, the described surging carburizing stage is warming up to 875-920 DEG C by the blank of above-mentioned pre-heating stage, methyl alcohol and propane gas environment and keeps 2-3h, and control the magnitude of recruitment of methyl alcohol and propane gas, maintain carbon potential and remain 1.0-1.15%, described diffusion phase is to 830-880 DEG C of maintenance 1.5-2h by the blank in surging carburizing stage, methyl alcohol and propane gas environment temperature reduction, and control the magnitude of recruitment of methyl alcohol and propane gas, maintain carbon potential and remain 0.7-0.75%.
2. a kind of Gear Production technique that is conducive to gear surface quality according to claim 1, is characterized in that, also comprises oil removing cleaning step between described machining and thermal treatment.
3. a kind of Gear Production technique that is conducive to gear surface quality according to claim 2, is characterized in that, described oil removing cleaning step is that to adopt temperature be the oil-removing cleaning agent of 50-65 DEG C is no less than 30min immersion treatment to blank.
4. a kind of Gear Production technique that is conducive to gear surface quality according to claim 1, is characterized in that, between described thermal treatment and essence cutting, also comprises the shot peening that is no less than 15min.
5. a kind of Gear Production technique that is conducive to gear surface quality according to claim 1, is characterized in that, described Slow cooling is that stove is cold.
6. a kind of Gear Production technique that is conducive to gear surface quality according to claim 1, is characterized in that, the heating for the second time to blank is also incubated blank and is arranged in restitutive protection's atmosphere surrounding.
7. a kind of Gear Production technique that is conducive to gear surface quality according to claim 1, is characterized in that, to blank heat for the second time and be incubated after quenching be oil cooling.
8. a kind of Gear Production technique that is conducive to gear surface quality according to claim 7, is characterized in that, also comprises cleaning step between described oil cooling and tempering step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410354590.8A CN104120378A (en) | 2014-07-24 | 2014-07-24 | Gear production process facilitating gear surface quality |
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| CN201410354590.8A CN104120378A (en) | 2014-07-24 | 2014-07-24 | Gear production process facilitating gear surface quality |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498965A (en) * | 2014-12-02 | 2015-04-08 | 南车戚墅堰机车车辆工艺研究所有限公司 | Carburizing and quenching method for cylindrical gear |
| CN114779601A (en) * | 2022-05-06 | 2022-07-22 | 江苏沙龙机电科技有限公司 | Wear-resistant mechanical timer transmission assembly and production process thereof |
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| US5427600A (en) * | 1992-11-30 | 1995-06-27 | Sumitomo Electric Industries, Ltd. | Low alloy sintered steel and method of preparing the same |
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| CN102373400A (en) * | 2011-10-25 | 2012-03-14 | 哈尔滨汇隆汽车箱桥有限公司 | Heat treatment method of spiral bevel gear of cargo truck on double-row rare earth carburization equipment |
| CN102618817A (en) * | 2012-03-22 | 2012-08-01 | 温州天和汽车部件有限公司 | Process for machining parts of automobile gear box by using 20CrMnTi steel |
| CN102776470A (en) * | 2012-07-09 | 2012-11-14 | 陈曦 | Surface chemico-thermal treatment method for mechanical parts and equipment used thereby |
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2014
- 2014-07-24 CN CN201410354590.8A patent/CN104120378A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5427600A (en) * | 1992-11-30 | 1995-06-27 | Sumitomo Electric Industries, Ltd. | Low alloy sintered steel and method of preparing the same |
| CN1804128A (en) * | 2005-11-30 | 2006-07-19 | 重庆长江轴承工业有限公司 | High carbon chromium bearing parts surface chemical heat-treatment process |
| CN102373400A (en) * | 2011-10-25 | 2012-03-14 | 哈尔滨汇隆汽车箱桥有限公司 | Heat treatment method of spiral bevel gear of cargo truck on double-row rare earth carburization equipment |
| CN102618817A (en) * | 2012-03-22 | 2012-08-01 | 温州天和汽车部件有限公司 | Process for machining parts of automobile gear box by using 20CrMnTi steel |
| CN102776470A (en) * | 2012-07-09 | 2012-11-14 | 陈曦 | Surface chemico-thermal treatment method for mechanical parts and equipment used thereby |
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| 陈葵 等: ""带内齿和内花键的汽车齿轮热处理变形的控制方法"", 《汽车工艺与材料》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104498965A (en) * | 2014-12-02 | 2015-04-08 | 南车戚墅堰机车车辆工艺研究所有限公司 | Carburizing and quenching method for cylindrical gear |
| CN114779601A (en) * | 2022-05-06 | 2022-07-22 | 江苏沙龙机电科技有限公司 | Wear-resistant mechanical timer transmission assembly and production process thereof |
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Application publication date: 20141029 |
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