CN104762629A - Processing technology for gearbox gear - Google Patents
Processing technology for gearbox gear Download PDFInfo
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- CN104762629A CN104762629A CN201410749697.2A CN201410749697A CN104762629A CN 104762629 A CN104762629 A CN 104762629A CN 201410749697 A CN201410749697 A CN 201410749697A CN 104762629 A CN104762629 A CN 104762629A
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Abstract
The invention relates to a processing method for a gear, especially to a processing technology for a gearbox gear. The processing technology comprises the following steps: step 1, blanking and forging so as to obtain a cylindrical blank; step 2, homogenization treatment of components of the forged blank and drilling of a center hole through lathing; step 3, gear hobbing out of the cylindrical blank via a hobbing machine; step 4, carbonization of a workpiece; step 5, cooling and quenching after carbonization; and step 6, machining of the workpiece so as to form the gear. The processing technology provided by the invention has the following beneficial effects: a, carburizing temperature and quenching temperature are reduced, carburizing time is not prolonged, and energy consumption is reduced; b, generation of a black structure is prevented, a uniform carburizing layer is obtained, the microstructure of the carburizing layer having undergone carbonization and quenching is improved, an optimal metallographic structure is obtained, and thus, surface hardness, wear resistance and fatigue resistance of the gear are obviously improved; and c, deformation is reduced, gear processing and assembling dimension precision of the gear is improved, gear transmission balance is enhanced, noise is reduced, and the service life of the gear is prolonged.
Description
Technical field
The present invention relates to a kind of working method of gear, particularly relate to a kind of high-power and complete processing of the marine gear of good toughness.
Background technology
Gearbox gear is one of the highest component of technical requirements, and gear is in operation process, intermeshing
Between the flank of tooth, existing rolling has slip again, gear is also subject to the effect of pulse stress and alternate flexural stress simultaneously, therefore require that gear need through Overheating Treatment to have good hardness, wear resistance, anti-fatigue performance, high dimensional accuracy, the performance of the low noise in running.
Carburizing and quenching, carbonitriding are the topmost heat treating methods of gearbox gear surface strengthening.In existing carburizing and quenching, carburizing temperature is generally 920-940 DEG C, and carburizing carbon potential CP is generally 1.0-1.2C%, and to obtaining high-quality carburizing top layer, but it has following deficiency: 1, carburizing temperature is high, and the time is long, and energy consumption is large; 2, distortion is large; 3, there is dark structure, cause lower hardness, reduce antifatigue, reduce wear resistance, reduction of service life.
Traditional processing process of gear: blanking (casting, forging) → normalizing (modified) → metalworking (teeth portion adopts gear hobbing gear shaping technique) → carry out high-frequency quenching again to form.Although this type gear manufacturing cost is lower, but be mainly limited by the limitation of conventional machining process: show as the material that can not adopt more high-quality, surface hardness is on the low side (≤HRC45-52), and thermal treatment is as final operation, quenching after strain amount cannot be eliminated, all the time≤0.8, tooth core tensile strength is generally at >=420Mpa for surfaceness.Manufacturing accuracy and kinematic accuracy all≤8-8-8GB10095-88.Obviously, this type of transmitting gear is confined to be applied in rotating speed, and high-load is not relatively low, the field that kinematic accuracy is not high.
Also the complete processing about gear is disclosed in present open file; as Chinese patent: " manufacture craft (CN102494106A) of 20CrMo converted steel gear " comprises following operation: forging stock one normalizing one machining one underannealing one machining one carburizing and quenching one tempering one throws nine; wherein underannealing technique is under the protection of atmosphere; in Ac1+(30-50) DEG C temperature condition under insulation 2 hours, and air cooling after cooling to 700 ~ 720 DEG C with the furnace.But this method exists dark structure, cause lower hardness, reduce antifatigue, reduce wear resistance, reduction of service life.
Application number be 201410037805.3 patent application disclose a kind of high-strength gear complete processing, comprise following processing step: (1) selects 20CrMnTi alloyed steel round billet material as raw material; (2) cylindrical grinding is carried out to circle blank, remove surperficial minute crack; (3) ball blast is carried out after circle blank being carried out anneal; (4) circle blank is processed respectively in Phosphating Solution and saponification liquor; (5) circle blank is obtained blank by extruded material viscous deformation, blank one end is involute profile, and the blank the other end is cylinder; (6) again extruded by extruded material viscous deformation by the blank that step (5) obtains, the blank one end obtained is involute profile, and the other end is annular fin; (7) endoporus is gone out at blank center car; (8) carburizing and quenching process is carried out by flat for workpiece; (9) workpiece is carried out temper; (10) ball blast.The gear surface hardness that the present invention obtains is hard, and core good toughness, improves the single-tooth strength of gear (2 modulus).But what its gear material was selected is select 20CrMnTi alloyed steel round billet material as raw material, and the cost of steel alloy is higher, and needs through multiple tracks cold-press process, tooling cost is simultaneously also higher.
Summary of the invention
The invention provides a kind of kinematic accuracy high, load is high, and surface hardness is high, the soft steel Gearmaking Technology peculiar to vessel of good toughness; The hardness solving the gear of the processing existed in prior art is low, and toughness is inadequate, the shortcoming that kinematic accuracy is not high.
Technical scheme of the present invention is:
A kind of gearbox gear complete processing, comprises the following steps:
The first step, blanking is carried out being forged to a cylindrical stock; Second step, forging stock component Homogenization Treatments, then Vehicle Processing drill centers; 3rd step, utilizes hobbing machine in the outer gear hobbing of cylindrical stock; 4th step, carries out carburizing treatment to workpiece; 5th step, carries out Cooling Quenching after carburizing; 6th step, carries out machining formative gear to workpiece; Carburization step, is placed in gear in process furnace, and process furnace is raised to 900 ± 5 DEG C with carburizing from room temperature, carburizing time 3 ~ 4 hours, and the carbon potential CP in stage of oozing by force in carburizing is 1.06 ± 0.03C%, and the carbon potential CP of diffusion phase is 0.85 ± 0.03C%; B. quenching Step, is cooled to 830 ± 5 DEG C by the gear after carburizing, then samming 25 ~ 35 minutes, then at 90 ± 10 DEG C of quenching oil quenchings; C. tempering step.
This gear material is soft steel.
This gear material is 20CrMnTi.
In this carburization step, after process furnace is raised to 900 ± 5 DEG C, carburizing is divided into initial period, oozes stage and diffusion phase by force; The carbon potential CP of this initial period is 0.95 ± 0.03C%; The carbon potential CP oozing by force the stage is 1.06 ± 0.03C%; Carbon potential 0.85 ± the 0.03C% of diffusion phase.
In this carburization step, the time of initial period is 9-11 minute, oozes by force the time 170-190 minute in stage, and the time of diffusion phase is 25-35 minute.
In this carburization step, in process furnace, pass into methyl alcohol and propane.
Carry out secondary high-temperature oil treatment again after described 5th step quenching Step to eliminate stress;
High temperature oil process is immersed 2 ~ 3 hours in the high temperature oil that temperature is 280 DEG C ~ 380 DEG C.
The beneficial effect of a kind of gearbox gear complete processing of the present invention is:
The invention provides a kind of gearbox gear complete processing, under the prerequisite ensureing quality of carburized layer, suitable reduction carburizing temperature and quenching temperature, improve quenching oil temperature, suitable raising carburizing carbon potential, to produce following technique effect: a, reduction carburizing temperature and quenching temperature, do not extend carburizing time, reduces energy consumption; B, can prevent dark structure from producing, obtain uniform cementation zone, improve the cementation zone microstructure after carburizing and quenching, obtain best microstructure, to significantly improve gear surface hardness, wear resistance and fatigue resistance; C, Reducing distortion, improve Gear Processing and fitted position precision, improves geartransmission balance, reduces noise, improves service life of gear.
In addition, present invention process passes into the carbon potential in methyl alcohol and propane energy adjusting and optimizing furnace atmosphere.
Embodiment
Below by embodiment, the technical scheme of invention is described in further detail.
embodiment one:
The heat treating method of gearbox gear carburizing and quenching, comprising:
A. carburization step, loads charging basket by gear, then inserts in the multiplex process furnace of sealed-box type, and process furnace is raised to 900 ± 5 DEG C with carburizing from room temperature, carburizing time 3 ~ 4 hours; Among the present embodiment, this process furnace is raised to 900 DEG C from room temperature, carburizing time 3 hours 40 minutes.This carburizing is divided into initial period, oozes stage and diffusion phase by force; Wherein: the carbon potential CP of the initial period of carburizing is 0.95 ± 0.03C%, 9-11 minute;
The carbon potential CP in the stage of oozing by force of carburizing is 1.06 ± 0.03C%, 170-190 minute; The carbon potential CP of the diffusion phase of carburizing is 0.85 ± 0.03C%, 25-35 minute; Among the present embodiment, the carbon potential CP of initial period is 0.95C%, 10 minutes; The carbon potential CP oozing by force the stage is 1.06C%, 180 minutes; The carbon potential CP of diffusion phase is 0.85C%, 30 minutes;
B. quenching Step, is cooled to 830 ± 5 DEG C by the gear after carburizing, then samming 25 ~ 35 minutes, then at 90 ± 10 DEG C of quenching oil quenchings; Among the present embodiment, the gear after carburizing is cooled to 830 DEG C, then samming 30 minutes, then at 90 ± 5 DEG C of quenching oil quenchings, and stirring at low speed;
C. tempering step, the gear after quenching carries out tempering in 2 ~ 3 hours in 165 DEG C.
Such as, among the present embodiment: this gear material is soft steel, selects 20CrMnTi.
Adopt above-mentioned treatment process to produce following technique effect: the gear 1, after thermal treatment, effective case depth is 0.5-0.8mm, and surface hardness is HRC59-63, and sclerosis rank is 1 grade; 2, prevent from, because internal oxidition produces dark structure, obtaining best microstructure; 3, be out of shape minimizing 1/2, precision improves 2-3 level, and carbide rank is 1 grade, reduces noise; 4,5% is economized on electricity.
embodiment two:
The heat treating method of gearbox gear carburizing and quenching, comprising:
A. carburization step, loads charging basket by gear, then inserts in the multiplex process furnace of sealed-box type, and process furnace is raised to 900 ± 5 DEG C with carburizing from room temperature, carburizing time 3 ~ 4 hours; Among the present embodiment, this process furnace is raised to 900 DEG C from room temperature, carburizing time 3 hours 40 minutes.Pass into methyl alcohol and propane and start carburizing being warmed up to 900 ± 5 DEG C of backward process furnace, this carburizing is divided into initial period, oozes stage and diffusion phase by force; Wherein: the carbon potential CP of the initial period of carburizing is 0.95 ± 0.03C%, 9-11 minute;
The carbon potential CP in the stage of oozing by force of carburizing is 1.06 ± 0.03C%, 170-190 minute; The carbon potential CP of the diffusion phase of carburizing is 0.85 ± 0.03C%, 25-35 minute; Among the present embodiment, the carbon potential CP of initial period is 0.95C%, 10 minutes; The carbon potential CP oozing by force the stage is 1.06C%, 180 minutes; The carbon potential CP of diffusion phase is 0.85C%, 30 minutes;
B. quenching Step, is cooled to 830 ± 5 DEG C by the gear after carburizing, then samming 25 ~ 35 minutes, then at 90 ± 10 DEG C of quenching oil quenchings; Among the present embodiment, the gear after carburizing is cooled to 830 DEG C, then samming 30 minutes, then at 90 ± 5 DEG C of quenching oil quenchings, and stirring at low speed;
C. tempering step, the gear after quenching carries out tempering in 2 ~ 3 hours in 165 DEG C.
Such as, among the present embodiment: this gear material is soft steel, selects 20CrMnTi.
Among the present embodiment, the additional proportion of this methyl alcohol and propane: 10:3-4.The add-on of this methyl alcohol such as
60-76ml/min/ cubic meter (heated furnace volume).
Adopt above-mentioned treatment process to produce following technique effect: the gear 1, after thermal treatment, effective case depth is 0.6-0.9mm, and surface hardness is HRC62-65, and sclerosis rank is 1 grade; 2, prevent from, because internal oxidition produces dark structure, obtaining best microstructure; 3, be out of shape minimizing 1/2, precision improves 2-3 level, and carbide rank is 1 grade, reduces noise; 4,5% is economized on electricity.
embodiment three:
The heat treating method of gearbox gear carburizing and quenching, comprising:
A. carburization step, loads charging basket by gear, then inserts in the multiplex process furnace of sealed-box type, and process furnace is raised to 900 ± 5 DEG C with carburizing from room temperature, carburizing time 3 ~ 4 hours; Among the present embodiment, this process furnace is raised to 900 DEG C from room temperature, carburizing time 3 hours 40 minutes.Pass into methyl alcohol and propane and start carburizing being warmed up to 900 ± 5 DEG C of backward process furnace, this carburizing is divided into initial period, oozes stage and diffusion phase by force; Wherein: the carbon potential CP of the initial period of carburizing is 0.95 ± 0.03C%, 9-11 minute;
The carbon potential CP in the stage of oozing by force of carburizing is 1.06 ± 0.03C%, 170-190 minute; The carbon potential CP of the diffusion phase of carburizing is 0.85 ± 0.03C%, 25-35 minute; Among the present embodiment, the carbon potential CP of initial period is 0.95C%, 10 minutes; The carbon potential CP oozing by force the stage is 1.06C%, 180 minutes; The carbon potential CP of diffusion phase is 0.85C%, 30 minutes;
B. quenching Step, is cooled to 830 ± 5 DEG C by the gear after carburizing, then samming 25 ~ 35 minutes, then at 90 ± 10 DEG C of quenching oil quenchings; Among the present embodiment, the gear after carburizing is cooled to 830 DEG C, then samming 30 minutes, then at 90 ± 5 DEG C of quenching oil quenchings, and stirring at low speed;
C. tempering step, the gear after quenching carries out tempering in 2 ~ 3 hours in 165 DEG C.
In the present embodiment, carry out secondary high-temperature oil treatment after quenching Step again and eliminate stress; High temperature oil process is immersed 2 ~ 3 hours in the high temperature oil that temperature is 280 DEG C ~ 380 DEG C.
Such as, among the present embodiment: this gear material is soft steel, selects 20CrMnTi.
Among the present embodiment, the additional proportion of this methyl alcohol and propane: 10:3-4.The add-on of this methyl alcohol such as
60-76ml/min/ cubic meter (heated furnace volume).
Adopt above-mentioned treatment process to produce following technique effect: the gear 1, after thermal treatment, effective case depth is 0.5-0.9mm, and surface hardness is HRC61-67, and sclerosis rank is 1 grade; 2, prevent from, because internal oxidition produces dark structure, obtaining best microstructure; 3, be out of shape minimizing 1/2, precision improves 2-3 level, and carbide rank is 1 grade, reduces noise; 4,5% is economized on electricity.
Claims (8)
1. a gearbox gear complete processing, comprises the following steps:
The first step, blanking is carried out being forged to a cylindrical stock; Second step, forging stock component Homogenization Treatments, then Vehicle Processing drill centers; 3rd step, utilizes hobbing machine in the outer gear hobbing of cylindrical stock; 4th step, carries out carburizing treatment to workpiece; 5th step, carries out Cooling Quenching after carburizing; 6th step, carries out machining formative gear to workpiece; It is characterized in that carburization step, be placed in by gear in process furnace, process furnace is raised to 900 ± 5 DEG C with carburizing from room temperature, carburizing time 3 ~ 4 hours, and the carbon potential CP in stage of oozing by force in carburizing is 1.06 ± 0.03C%, the carbon potential CP of diffusion phase is 0.85 ± 0.03C%; B. quenching Step, is cooled to 830 ± 5 DEG C by the gear after carburizing, then samming 25 ~ 35 minutes, then at 90 ± 10 DEG C of quenching oil quenchings; C. tempering step.
2. a kind of gearbox gear complete processing according to claim 1, is characterized in that this gear material is soft steel.
3. a kind of gearbox gear complete processing according to claim 1, is characterized in that this gear material is 20CrMnTi.
4. a kind of gearbox gear complete processing according to claim 1 or 2 or 3, is characterized in that in this carburization step, and after process furnace is raised to 900 ± 5 DEG C, carburizing is divided into initial period, oozes stage and diffusion phase by force; The carbon potential CP of this initial period is 0.95 ± 0.03C%; The carbon potential CP oozing by force the stage is 1.06 ± 0.03C%; Carbon potential 0.85 ± the 0.03C% of diffusion phase.
5. a kind of gearbox gear complete processing according to claim 4, is characterized in that in this carburization step, and the time of initial period is 9-11 minute, oozes by force the time 170-190 minute in stage, and the time of diffusion phase is 25-35 minute.
6. a kind of gearbox gear complete processing according to claim 1 or 2 or 3, is characterized in that, in this carburization step, passing into methyl alcohol and propane in process furnace.
7. a kind of gearbox gear complete processing according to claim 1, carries out secondary high-temperature oil treatment again after it is characterized in that described 5th step quenching Step and eliminates stress.
8. a kind of gearbox gear complete processing according to claim 7, is characterized in that high temperature oil process is immersed 2 ~ 3 hours in the high temperature oil that temperature is 280 DEG C ~ 380 DEG C.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105855812A (en) * | 2016-03-31 | 2016-08-17 | 杭州科技职业技术学院 | Machining process of automobile transmission gears |
| CN105886999A (en) * | 2016-06-13 | 2016-08-24 | 含山县朝霞铸造有限公司 | Superficial layer carburization process for automobile hub |
| CN106222605A (en) * | 2016-08-29 | 2016-12-14 | 盐城圣奥热处理有限公司 | A kind of gear carburizing quenching process |
| 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 |
| CN107443032A (en) * | 2017-09-29 | 2017-12-08 | 太仓市三源机电有限公司 | A kind of processing technology of gear |
| CN108676992A (en) * | 2018-06-25 | 2018-10-19 | 温岭市万泰热处理厂（普通合伙） | A kind of heat treatment process of output shaft |
| CN108747241A (en) * | 2018-08-06 | 2018-11-06 | 合肥银泉铸造有限责任公司 | A kind of spiral case making technique |
| CN108747242A (en) * | 2018-08-06 | 2018-11-06 | 合肥银泉铸造有限责任公司 | A kind of worm-gear toothing processing technology |
| CN110125623A (en) * | 2019-05-21 | 2019-08-16 | 台州格凌机械有限公司 | A kind of production technology of gear |
| CN110216429A (en) * | 2019-04-30 | 2019-09-10 | 兴化市统一齿轮有限公司 | A kind of automobile gearbox gear and its manufacturing method |
| CN110592331A (en) * | 2019-09-16 | 2019-12-20 | 河南广瑞汽车部件股份有限公司 | Heat treatment production method for cast steel wear-resistant part |
| CN113084466A (en) * | 2021-03-08 | 2021-07-09 | 华南理工大学 | Method for processing helical gear with three-section consistent precision and helical gear |
| CN113305581A (en) * | 2021-06-09 | 2021-08-27 | 南京二机齿轮机床有限公司 | Automatic production line for gear machining |
| CN115091150A (en) * | 2022-06-23 | 2022-09-23 | 中国第一汽车股份有限公司 | Rapid trial-manufacturing method of high-precision transmission gear and transmission gear |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105855812A (en) * | 2016-03-31 | 2016-08-17 | 杭州科技职业技术学院 | Machining process of automobile transmission gears |
| CN105886999A (en) * | 2016-06-13 | 2016-08-24 | 含山县朝霞铸造有限公司 | Superficial layer carburization process for automobile hub |
| CN106222605A (en) * | 2016-08-29 | 2016-12-14 | 盐城圣奥热处理有限公司 | A kind of gear carburizing quenching process |
| 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 |
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| CN107443032A (en) * | 2017-09-29 | 2017-12-08 | 太仓市三源机电有限公司 | A kind of processing technology of gear |
| CN108676992A (en) * | 2018-06-25 | 2018-10-19 | 温岭市万泰热处理厂（普通合伙） | A kind of heat treatment process of output shaft |
| CN108747241A (en) * | 2018-08-06 | 2018-11-06 | 合肥银泉铸造有限责任公司 | A kind of spiral case making technique |
| CN108747242A (en) * | 2018-08-06 | 2018-11-06 | 合肥银泉铸造有限责任公司 | A kind of worm-gear toothing processing technology |
| CN110216429A (en) * | 2019-04-30 | 2019-09-10 | 兴化市统一齿轮有限公司 | A kind of automobile gearbox gear and its manufacturing method |
| CN110125623A (en) * | 2019-05-21 | 2019-08-16 | 台州格凌机械有限公司 | A kind of production technology of gear |
| CN110592331A (en) * | 2019-09-16 | 2019-12-20 | 河南广瑞汽车部件股份有限公司 | Heat treatment production method for cast steel wear-resistant part |
| CN113084466A (en) * | 2021-03-08 | 2021-07-09 | 华南理工大学 | Method for processing helical gear with three-section consistent precision and helical gear |
| CN113305581A (en) * | 2021-06-09 | 2021-08-27 | 南京二机齿轮机床有限公司 | Automatic production line for gear machining |
| CN115091150A (en) * | 2022-06-23 | 2022-09-23 | 中国第一汽车股份有限公司 | Rapid trial-manufacturing method of high-precision transmission gear and transmission gear |
| CN115091150B (en) * | 2022-06-23 | 2024-04-16 | 中国第一汽车股份有限公司 | Rapid trial-manufacturing processing method of high-precision transmission gear and transmission gear |
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