CN105269279A - Manufacturing process for carburizing steel gear - Google Patents
Manufacturing process for carburizing steel gear Download PDFInfo
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- CN105269279A CN105269279A CN201410341113.8A CN201410341113A CN105269279A CN 105269279 A CN105269279 A CN 105269279A CN 201410341113 A CN201410341113 A CN 201410341113A CN 105269279 A CN105269279 A CN 105269279A
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- carburizing
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- steel gear
- carburizing steel
- quenching
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Abstract
The invention discloses a manufacturing process for a 20CrMo carburizing steel gear. The manufacturing process comprises the following procedures of stock forging, normalizing, machining, slack annealing, machining, carburizing and quenching, tempering and shot blasting, wherein in the procedure of the slack annealing, heat preservation is conducted for 2 hours under the protection of atmosphere and under the temperature condition of Acl+(30-50) DEG C, and air cooling is conducted after the temperature is cooled to 700-720 DEG C through furnace cooling. The manufacturing process for the 20CrMo carburizing steel gear can not only eliminate internal stress of a workpiece more thoroughly but also improve the crystalline phase organization structure of the workpiece, so that the matrix structure of the workpiece is more uniform; the deformation is smaller in the follow-up carburizing and quenching procedure, and the machining precision of the workpiece is ensured.
Description
Technical field
The present invention relates to a kind of Gearmaking Technology, concrete is a kind of gear manufacture craft adopting 20CrMo carburizing steel to make gear.
Background technology
Motorcycle-gear generally adopts 20CrMo steel to do, and in the cold working process adopting 20CrMo steel making gear, in order to eliminate inner stress of work, reducing the distortion of workpiece and preventing workpiece from ftractureing, usually adopting the stress relief annealing of 500 ~ 600 DEG C to process.Although adopt this stress relief annealing technique can remove inner stress of work to a certain extent, but inner stress of work is removed also not exclusively, matrix is also even not, and in the carburizing quenching process causing machining gears follow-up, the deflection of workpiece is wayward, and sex change is larger.
Given this, the present invention proposes a kind of manufacture craft of carburizing steel gear, the manufacture craft of this carburizing steel gear can not only eliminate inner stress of work more up hill and dale, and the crystalline phase institutional framework of workpiece can be improved, workpiece substrate is organized more even, deflection in follow-up carburizing and quenching operation is less, ensures the machining accuracy of workpiece.
Summary of the invention
The technical problem solved is the manufacture craft proposing a kind of carburizing steel gear, this 20CrMo
The manufacture craft of carburizing steel gear can not only eliminate inner stress of work more up hill and dale, and the crystalline phase institutional framework of workpiece can be improved, workpiece substrate is organized more even, the deflection in follow-up carburizing and quenching operation is less, ensures the machining accuracy of workpiece.
State technical purpose, the manufacture craft of carburizing steel gear of the present invention, comprises following work
Sequence: forging stock → normalizing → machined → partial annealing → machined → carburizing and quenching → tempering → ball blast; wherein partial annealing technique is under the protection of atmosphere; at Ac1+(30-50) DEG C temperature conditions under insulation 2 hours, and air cooling after cooling to 700 ~ 720 DEG C with the furnace.
Described protective atmosphere is methanol gas.
Beneficial effect of the present invention is: the manufacture craft of carburizing steel gear of the present invention due to the heating-up temperature of partial annealing operation be the Ac1+(30-50 of 20CrMo steel) DEG C, the crystalline phase tissue part austenitizing of 20CrMo carburizing steel can be made, in process air cooler subsequently, structural transformation is fine pearlite and ferrite, effectively eliminates the stress produced in cold working process; Meanwhile, due to tissue part's austenitizing, the relatively general stress relief annealing that tissue change does not occur, destressing is effective, and matrix is more equal
Even, follow-up carburizing and quenching distortion more easy to control; Therefore, the manufacture craft of carburizing steel gear of the present invention can not only eliminate inner stress of work more up hill and dale, and can improve the crystalline phase institutional framework of workpiece, workpiece substrate is organized more even, deflection in follow-up carburizing and quenching operation is less, ensures the machining accuracy of workpiece.
Detailed description of the invention
Below the specific embodiment of the present invention is elaborated.
The manufacture craft of carburizing steel gear of the present invention; comprise following operation: forging stock → normalizing → machined → partial annealing → machined → carburizing and quenching → tempering → ball blast; wherein partial annealing technique is under the atmosphere protection of methanol gas; at Ac1+(30-50) DEG C temperature conditions under insulation 2 hours, and air cooling after cooling to 700 ~ 720 DEG C with the furnace.Other operations of the manufacture craft of carburizing steel gear of the present invention are same as the prior art, tire out no longer one by one and state.
The manufacture craft of carburizing steel gear of the present invention due to the heating-up temperature of partial annealing operation be the Ac1+(30-50 of 20CrMo steel) DEG C, the critical-temperature Ac1 of 20CrMo steel is 743 DEG C, the crystalline phase tissue part austenitizing of 20CrMo carburizing steel can be made, in process air cooler subsequently, structural transformation is fine pearlite and ferrite, effectively eliminates the stress produced in cold working process; Meanwhile, due to tissue part's austenitizing, the relatively general stress relief annealing that tissue change does not occur, destressing is effective, and matrix evenly, follow-up carburizing and quenching more easy to control distortion; Therefore, the manufacture craft of carburizing steel gear of the present invention can not only eliminate inner stress of work more up hill and dale, and can improve the crystalline phase institutional framework of workpiece, workpiece substrate is organized more even, deflection in follow-up carburizing and quenching operation is less, ensures the machining accuracy of workpiece.
First embodiment
The manufacture craft of the present embodiment carburizing steel gear; comprise following operation: forging stock → normalizing → machined → partial annealing → machined → carburizing and quenching → tempering → ball blast; wherein partial annealing technique is under the atmosphere protection of methanol gas; 2 hours are incubated under the temperature conditions of 780 DEG C, and air cooling after cooling to 720 DEG C with the furnace.Other operations of the manufacture craft of the present embodiment carburizing steel gear are same as the prior art, tire out no longer one by one and state.
The manufacture craft of the present embodiment carburizing steel gear due to the heating-up temperature of partial annealing operation be 780 DEG C, this temperature drops on the Ac1+(30-50 of 20CrMo steel) DEG C between, the crystalline phase tissue part austenitizing of 20CrMo carburizing steel can be made, in process air cooler subsequently, structural transformation is fine pearlite and ferrite, effectively eliminates the stress produced in cold working process.Meanwhile, due to tissue part's austenitizing, the relatively general stress relief annealing that tissue change does not occur, destressing is effective, and matrix evenly, follow-up carburizing and quenching more easy to control distortion.Therefore, the manufacture craft of carburizing steel gear of the present invention can not only eliminate inner stress of work more up hill and dale, and can improve the crystalline phase institutional framework of workpiece, workpiece substrate is organized more even, deflection in follow-up carburizing and quenching operation is less, ensures the machining accuracy of workpiece.
Second embodiment
The manufacture craft of the present embodiment carburizing steel gear; comprise following operation: forging stock → normalizing → machined → partial annealing → machined → carburizing and quenching → tempering → ball blast; wherein partial annealing technique is under the atmosphere protection of methanol gas; 2 hours are incubated under the temperature conditions of 775 DEG C, and air cooling after cooling to 700 DEG C with the furnace.Other operations of the manufacture craft of the present embodiment carburizing steel gear are same as the prior art, tire out no longer one by one and state.
The manufacture craft of the present embodiment carburizing steel gear due to the heating-up temperature of partial annealing operation be 775 DEG C, this temperature drops on the Ac1+(30-50 of 20CrMo steel) DEG C between, the crystalline phase tissue part austenitizing of 20CrMo carburizing steel can be made, in process air cooler subsequently, structural transformation is fine pearlite and ferrite, effectively eliminates the stress produced in cold working process.Meanwhile, due to tissue part's austenitizing, the relatively general stress relief annealing that tissue change does not occur, destressing is effective, and matrix evenly, follow-up carburizing and quenching more easy to control distortion.Therefore, the manufacture craft of carburizing steel gear of the present invention can not only eliminate inner stress of work more up hill and dale, and can improve the crystalline phase institutional framework of workpiece, workpiece substrate is organized more even, deflection in follow-up carburizing and quenching operation is less, ensures the machining accuracy of workpiece.
The manufacture craft of the 3rd embodiment the present embodiment carburizing steel gear; comprise following operation: forging stock → normalizing → machined → partial annealing → machined → carburizing and quenching → tempering → ball blast; wherein partial annealing technique is under the atmosphere protection of methanol gas; 2 hours are incubated under the temperature conditions of 790 DEG C, and air cooling after cooling to 710 DEG C with the furnace.Other operations of the manufacture craft of the present embodiment carburizing steel gear are same as the prior art, tire out no longer one by one and state.
The manufacture craft of the present embodiment carburizing steel gear due to the heating-up temperature of partial annealing operation be 790 DEG C, this temperature drops on the Ac1+(30-50 of 20CrMo steel) DEG C between, the crystalline phase tissue part austenitizing of 20CrMo carburizing steel can be made, in process air cooler subsequently, structural transformation is fine pearlite and ferrite, effectively eliminates the stress produced in cold working process.Meanwhile, due to tissue part's austenitizing, the relatively general stress relief annealing that tissue change does not occur, destressing is effective, and matrix evenly, follow-up carburizing and quenching more easy to control distortion.Therefore, the manufacture craft of carburizing steel gear of the present invention can not only eliminate inner stress of work more up hill and dale, and can improve the crystalline phase institutional framework of workpiece, workpiece substrate is organized more even, deflection in follow-up carburizing and quenching operation is less, ensures the machining accuracy of workpiece.
Certainly, above-mentioned explanation is not limitation of the present invention, the present invention is also not limited to above-mentioned citing, those skilled in the art, in essential scope of the present invention, the change made, remodeling, add or replace, the technical staff that should belong to the industry of the present invention should understand, the present invention is not restricted to the described embodiments, what describe in above-described embodiment and description just illustrates principle of the present invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (2)
1. the manufacture craft of a carburizing steel gear; it is characterized in that: comprise following operation: forging stock → normalizing → machined → partial annealing → machined → carburizing and quenching → tempering → ball blast; wherein partial annealing technique is under the protection of atmosphere; at Ac1+(30-50) DEG C temperature conditions under insulation 2 hours, and air cooling after cooling to 700 ~ 720 DEG C with the furnace.
2. the manufacture craft of carburizing steel gear according to claim 1, is characterized in that: described protective atmosphere is methanol gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410341113.8A CN105269279A (en) | 2014-07-18 | 2014-07-18 | Manufacturing process for carburizing steel gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410341113.8A CN105269279A (en) | 2014-07-18 | 2014-07-18 | Manufacturing process for carburizing steel gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105269279A true CN105269279A (en) | 2016-01-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410341113.8A Pending CN105269279A (en) | 2014-07-18 | 2014-07-18 | Manufacturing process for carburizing steel gear |
Country Status (1)
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|---|---|
| CN (1) | CN105269279A (en) |
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2014
- 2014-07-18 CN CN201410341113.8A patent/CN105269279A/en active Pending
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160127 |
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| WD01 | Invention patent application deemed withdrawn after publication |