CN105734253A - 38 CrMoAlA gear thermal treatment method - Google Patents
38 CrMoAlA gear thermal treatment method Download PDFInfo
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- CN105734253A CN105734253A CN201410760096.1A CN201410760096A CN105734253A CN 105734253 A CN105734253 A CN 105734253A CN 201410760096 A CN201410760096 A CN 201410760096A CN 105734253 A CN105734253 A CN 105734253A
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Abstract
The invention discloses a 38 CrMoAlA gear thermal treatment method. The method comprises the following procedures that 38 CrMoAlA is selected as a material; the thermal treatment technology is conducted and includes annealing, tempering, high-temperature stress removing and nitriding; in the annealing procedure, complete annealing is conducted, forging stress is eliminated, and the annealing procedure is conducted before cutting; in the tempering procedure, 930 DEG C*3 h oil or water cooling is conducted, 650 DEG C*5-6 h high-temperature tempering is conducted, the hardness ranges from 265 HB to 295 HB, the amount of ferrite at the position 10 mm away from the surface is smaller than 5% in the metallographic examination, and the tempering procedure is conducted before outer circle finish turning; in the high-temperature stress removing procedure, 630 DEG C*5 h furnace cooling and 350 DEG C discharging air cooling are conducted, residual stress caused by cutting is eliminated, and the high-temperature stress removing procedure is conducted after outer circle rough grinding; and in the nitriding procedure, two-section nitriding of 500 DEG C-520 DEG C*5 h+550 DEG C-560 DEG C*25 h is conducted, the depth of a nitriding layer is not smaller than 0.45 mm, the hardness of the nitriding layer is larger than 950 HV, the embrittlement of the nitriding layer is not larger than 2 levels, and the nitriding procedure is conducted before outer circle finish grinding.
Description
Technical field
The present invention relates to a kind of 38CrMoAlA gear heat treatment method.
Background technology
The adjustment in processing step and device parameter etc. of the existing 38CrMoAlA gear heat treatment method there is also certain empirical and technical, for the operator newly started with, also need to carry out substantial amounts of exercise and could grasp operation skill, produce the good product of quality.
Summary of the invention
In order to realize the purpose of the present invention, the present invention provides a kind of 38CrMoAlA gear heat treatment method of easy to operate, quick, easy left-hand seat.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that
A kind of 38CrMoAlA gear heat treatment method, including following operation:
Material selection 38CrMoAlA. Technology for Heating Processing: annealing one modified high temperature de-stress one nitriding；
Annealing: full annealing, eliminates forging stress, carries out before machining；
Modified: 930 DEG C of * 3h oil or water-cooled, 650 DEG C of * 5～6h high temperings, HB265～295, metallographic examination, carries out before outer circle finish turning from 10mm place, surface ferrite content less than 5%；
High temperature de-stress: 630 DEG C of * 5h stoves are cold, come out of the stove air-cooled for 350 DEG C, eliminates the residual stress that machining causes, and carries out after corase grind cylindrical；
Nitriding: 5h+550 DEG C～560 DEG C * 25h two-stage nitration of 500 DEG C～520 DEG C * nitrogenize, and nitride layer depth is not less than 0.45mm, and hardness is more than 950HV, and embrittlement is not more than 2 grades, carries out before fine grinding cylinder.
The present invention is simple to operate, and operator's skill requirement is low, and product quality is high.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
A kind of 38CrMoAlA gear heat treatment method, including following operation:
Material selection 38CrMoAlA. Technology for Heating Processing: annealing one modified high temperature de-stress one nitriding；
Annealing: full annealing, eliminates forging stress, carries out before machining；
Modified: 930 DEG C of * 3h oil or water-cooled, 650 DEG C of * 5～6h high temperings, HB265～295, metallographic examination, carries out before outer circle finish turning from 10mm place, surface ferrite content less than 5%；
High temperature de-stress: 630 DEG C of * 5h stoves are cold, come out of the stove air-cooled for 350 DEG C, eliminates the residual stress that machining causes, and carries out after corase grind cylindrical；Nitriding: 5h+550 DEG C～560 DEG C * 25h two-stage nitration of 500 DEG C～520 DEG C * nitrogenize, and nitride layer depth is not less than 0.45mm, and hardness is more than 950HV, and embrittlement is not more than 2 grades, carries out before fine grinding cylinder.
Claims (1)
1. a 38CrMoAlA gear heat treatment method, is characterized in that: include following operation:
Material selection 38CrMoAlA. Technology for Heating Processing: annealing one modified high temperature de-stress one nitriding；
Annealing: full annealing, eliminates forging stress, carries out before machining；
Modified: 930 DEG C of * 3h oil or water-cooled, 650 DEG C of * 5～6h high temperings, HB265～295, metallographic examination, carries out before outer circle finish turning from 10mm place, surface ferrite content less than 5%；
High temperature de-stress: 630 DEG C of * 5h stoves are cold, come out of the stove air-cooled for 350 DEG C, eliminates the residual stress that machining causes, and carries out after corase grind cylindrical；Nitriding: 5h+550 DEG C～560 DEG C * 25h two-stage nitration of 500 DEG C～520 DEG C * nitrogenize, and nitride layer depth is not less than 0.45mm, and hardness is more than 950HV, and embrittlement is not more than 2 grades, carries out before fine grinding cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410760096.1A CN105734253A (en) | 2014-12-12 | 2014-12-12 | 38 CrMoAlA gear thermal treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410760096.1A CN105734253A (en) | 2014-12-12 | 2014-12-12 | 38 CrMoAlA gear thermal treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105734253A true CN105734253A (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410760096.1A Pending CN105734253A (en) | 2014-12-12 | 2014-12-12 | 38 CrMoAlA gear thermal treatment method |
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| CN (1) | CN105734253A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011779A (en) * | 2022-06-23 | 2022-09-06 | 东风商用车有限公司 | High-speed heavy-load automobile nitrided inner gear ring and production process thereof |
-
2014
- 2014-12-12 CN CN201410760096.1A patent/CN105734253A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011779A (en) * | 2022-06-23 | 2022-09-06 | 东风商用车有限公司 | High-speed heavy-load automobile nitrided inner gear ring and production process thereof |
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Application publication date: 20160706 |