CN112575169A - Heat treatment process for automobile transmission gear - Google Patents
Heat treatment process for automobile transmission gear Download PDFInfo
- Publication number
- CN112575169A CN112575169A CN202011462004.3A CN202011462004A CN112575169A CN 112575169 A CN112575169 A CN 112575169A CN 202011462004 A CN202011462004 A CN 202011462004A CN 112575169 A CN112575169 A CN 112575169A
- Authority
- CN
- China
- Prior art keywords
- gear
- heat
- treatment process
- automobile transmission
- heat treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
Abstract
The invention discloses a heat treatment process for an automobile transmission gear; relates to the technical field of automobile parts, comprising the following steps: (1) placing the gear in a resistance furnace, introducing inert gas, rapidly heating to 780-810 ℃, and preserving heat for 40 min; (2) carrying out water quenching treatment on the heat-insulated gear to obtain a water quenched gear; (3) heating the water quenching gear to 550-580 ℃, then introducing a mixed gas of methane and carbon dioxide, preserving the heat for 10-20min, adjusting the temperature to 700-730 ℃, continuing to preserve the heat for 1-1.5 h, then removing the gear, and naturally recovering the temperature to room temperature to obtain a pretreated gear; (4) slowly heating the pretreated gear to 350-400 ℃, preserving heat for 2-3 hours, taking out, and naturally recovering to room temperature; the gear for the automobile transmission prepared by the method has excellent wear resistance.
Description
Technical Field
The invention belongs to the technical field of automobile parts, and particularly relates to a heat treatment process for an automobile transmission gear.
Background
A vehicle transmission is a set of speed change devices for coordinating the rotation speed of an engine and the actual running speed of wheels, and is used for exerting the optimal performance of the engine. The transmission can produce different transmission ratios between the engine and the wheels during the running of the vehicle.
The engine can be operated in its optimum power performance state by shifting gears. The development trend of the transmission is more and more complex, the automation degree is higher and higher, and the automatic transmission is the mainstream in the future.
Gears in an automobile transmission are one of main parts, and the gears rotate at high speed when working, contact and rub with each other, and a great deal of abrasion is caused.
Disclosure of Invention
The invention aims to provide a heat treatment process for an automobile transmission gear, which aims to overcome the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a heat treatment process for an automobile transmission gear comprises the following steps:
(1) placing the gear in a resistance furnace, introducing inert gas, rapidly heating to 780-810 ℃, and preserving heat for 40 min;
(2) carrying out water quenching treatment on the heat-insulated gear to obtain a water quenched gear;
(3) heating the water quenching gear to 550-580 ℃, then introducing a mixed gas of methane and carbon dioxide, preserving the heat for 10-20min, adjusting the temperature to 700-730 ℃, continuing to preserve the heat for 1-1.5 h, then removing the gear, and naturally recovering the temperature to room temperature to obtain a pretreated gear;
(4) slowly heating the pretreated gear to 350-400 ℃, preserving heat for 2-3 hours, taking out, and naturally recovering to room temperature.
The inert gas is neon.
The rapid heating rate was 20 ℃/s.
The water temperature of the water quenching is 20 ℃.
The mixing volume ratio of the methane to the carbon dioxide is 1: 2.
The slow heating rate was 2 ℃/s.
Has the advantages that:
the gear for the automobile transmission prepared by the method has excellent wear resistance, can greatly improve the surface hardness of the gear by performing high-temperature heating treatment on the gear and then performing water quenching, can greatly improve the wear resistance of the surface of the gear, can improve the surface hardness of the gear by about 30 percent on average, and can further improve the performance of the surface structure of the gear by performing high-temperature reaction treatment by adopting methane and carbon dioxide gas, and can further improve the service life and prolong the working time by remarkably improving the surface wear resistance of the gear.
Detailed Description
A heat treatment process for an automobile transmission gear comprises the following steps:
(1) placing the gear in a resistance furnace, introducing inert gas, rapidly heating to 780-810 ℃, and preserving heat for 40 min;
(2) carrying out water quenching treatment on the heat-insulated gear to obtain a water quenched gear;
(3) heating the water quenching gear to 550-580 ℃, then introducing a mixed gas of methane and carbon dioxide, preserving the heat for 10-20min, adjusting the temperature to 700-730 ℃, continuing to preserve the heat for 1-1.5 h, then removing the gear, and naturally recovering the temperature to room temperature to obtain a pretreated gear;
(4) slowly heating the pretreated gear to 350-400 ℃, preserving heat for 2-3 hours, taking out, and naturally recovering to room temperature.
The inert gas is neon.
The rapid heating rate was 20 ℃/s.
The water temperature of the water quenching is 20 ℃.
The mixing volume ratio of the methane to the carbon dioxide is 1: 2.
The slow heating rate was 2 ℃/s.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A heat treatment process for an automobile transmission gear comprises the following steps:
(1) placing the gear in a resistance furnace, introducing inert gas, rapidly heating to 780 ℃, and preserving heat for 40 min;
(2) carrying out water quenching treatment on the heat-insulated gear to obtain a water quenched gear;
(3) heating the water quenching gear to 550 ℃, introducing a mixed gas of methane and carbon dioxide, preserving the heat for 10min, adjusting the temperature to 700 ℃, continuing preserving the heat for 1 hour, then removing the gear, and naturally recovering the temperature to room temperature to obtain a pretreated gear;
(4) and slowly heating the pretreated gear to 350 ℃, preserving the heat for 2 hours, taking out, and naturally recovering to room temperature.
The inert gas is neon.
The rapid heating rate was 20 ℃/s.
The water temperature of the water quenching is 20 ℃.
The mixing volume ratio of the methane to the carbon dioxide is 1: 2.
The slow heating rate was 2 ℃/s.
Example 2
A heat treatment process for an automobile transmission gear comprises the following steps:
(1) placing the gear in a resistance furnace, introducing inert gas, rapidly heating to 810 ℃, and preserving heat for 40 min;
(2) carrying out water quenching treatment on the heat-insulated gear to obtain a water quenched gear;
(3) heating the water quenching gear to 580 ℃, then introducing a mixed gas of methane and carbon dioxide, preserving the heat for 20min, adjusting the temperature to 730 ℃, continuing to preserve the heat for 1-1.5 hours, then removing the gear, and naturally recovering the temperature to room temperature to obtain a pretreated gear;
(4) and slowly heating the pretreated gear to 400 ℃, preserving heat for 2-3 hours, taking out, and naturally recovering to room temperature.
The inert gas is neon.
The rapid heating rate was 20 ℃/s.
The water temperature of the water quenching is 20 ℃.
The mixing volume ratio of the methane to the carbon dioxide is 1: 2.
The slow heating rate was 2 ℃/s.
Example 3
A heat treatment process for an automobile transmission gear comprises the following steps:
(1) placing the gear in a resistance furnace, introducing inert gas, rapidly heating to 790 ℃, and preserving heat for 40 min;
(2) carrying out water quenching treatment on the heat-insulated gear to obtain a water quenched gear;
(3) heating the water quenching gear to 560 ℃, then introducing a mixed gas of methane and carbon dioxide, preserving the heat for 15min, adjusting the temperature to 710 ℃, continuing preserving the heat for 1.2 h, then removing the gear, and naturally recovering to room temperature to obtain a pretreated gear;
(4) and slowly heating the pretreated gear to 380 ℃, preserving heat for 2.5 hours, taking out, and naturally recovering to room temperature.
The inert gas is neon.
The rapid heating rate was 20 ℃/s.
The water temperature of the water quenching is 20 ℃.
The mixing volume ratio of the methane to the carbon dioxide is 1: 2.
The slow heating rate was 2 ℃/s.
The wear resistance test comparison was carried out on the gears of examples:
20 hours abrasion loss, comparison:
the ball material ratio is 1: 2;
the rotating speed of the grinding ball is 1500 r/min;
TABLE 1
| Abrasion mg | |
| Example 1 | 0.0012 |
| Example 2 | 0.0014 |
| Example 3 | 0.0011 |
As can be seen from Table 1, the wear resistance of the gears treated by the method of the present invention is greatly improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (6)
1. The heat treatment process for the automobile transmission gear is characterized by comprising the following steps of:
(1) placing the gear in a resistance furnace, introducing inert gas, rapidly heating to 780-810 ℃, and preserving heat for 40 min;
(2) carrying out water quenching treatment on the heat-insulated gear to obtain a water quenched gear;
(3) heating the water quenching gear to 550-580 ℃, then introducing a mixed gas of methane and carbon dioxide, preserving the heat for 10-20min, adjusting the temperature to 700-730 ℃, continuing to preserve the heat for 1-1.5 h, then removing the gear, and naturally recovering the temperature to room temperature to obtain a pretreated gear;
(4) slowly heating the pretreated gear to 350-400 ℃, preserving heat for 2-3 hours, taking out, and naturally recovering to room temperature.
2. The heat treatment process for the automobile transmission gear according to claim 1, characterized in that: the inert gas is neon.
3. The heat treatment process for the automobile transmission gear according to claim 1, characterized in that: the rapid heating rate was 20 ℃/s.
4. The heat treatment process for the automobile transmission gear according to claim 1, characterized in that: the water temperature of the water quenching is 20 ℃.
5. The heat treatment process for the automobile transmission gear according to claim 1, characterized in that: the mixing volume ratio of the methane to the carbon dioxide is 1: 2.
6. The heat treatment process for the automobile transmission gear according to claim 1, characterized in that: the slow heating rate was 2 ℃/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462004.3A CN112575169A (en) | 2020-12-14 | 2020-12-14 | Heat treatment process for automobile transmission gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462004.3A CN112575169A (en) | 2020-12-14 | 2020-12-14 | Heat treatment process for automobile transmission gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112575169A true CN112575169A (en) | 2021-03-30 |
Family
ID=75132244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011462004.3A Pending CN112575169A (en) | 2020-12-14 | 2020-12-14 | Heat treatment process for automobile transmission gear |
Country Status (1)
| Country | Link |
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| CN (1) | CN112575169A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000234128A (en) * | 1998-12-18 | 2000-08-29 | Ntn Corp | Gear shaft support device of transmission for vehicle |
| US20030205297A1 (en) * | 2002-05-01 | 2003-11-06 | Tipps Jerry A. | Carburizing method |
| CN103643000A (en) * | 2013-11-26 | 2014-03-19 | 常熟市东风齿轮厂 | Thermal processing technology for wear-resistant gears |
| CN104805256A (en) * | 2015-04-28 | 2015-07-29 | 柳州科尔特锻造机械有限公司 | Heat treatment technology for low-load gear |
| CN105734589A (en) * | 2014-12-09 | 2016-07-06 | 重庆渝南科技股份有限公司 | Heat treatment process for high-abrasion-resistance gear |
-
2020
- 2020-12-14 CN CN202011462004.3A patent/CN112575169A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000234128A (en) * | 1998-12-18 | 2000-08-29 | Ntn Corp | Gear shaft support device of transmission for vehicle |
| US20030205297A1 (en) * | 2002-05-01 | 2003-11-06 | Tipps Jerry A. | Carburizing method |
| CN103643000A (en) * | 2013-11-26 | 2014-03-19 | 常熟市东风齿轮厂 | Thermal processing technology for wear-resistant gears |
| CN105734589A (en) * | 2014-12-09 | 2016-07-06 | 重庆渝南科技股份有限公司 | Heat treatment process for high-abrasion-resistance gear |
| CN104805256A (en) * | 2015-04-28 | 2015-07-29 | 柳州科尔特锻造机械有限公司 | Heat treatment technology for low-load gear |
Non-Patent Citations (1)
| Title |
|---|
| 沙莫毫茨基等: "《金属学》", 28 February 1955, 机械工业出版社 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210330 |
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| RJ01 | Rejection of invention patent application after publication |