CN105648448A - Bevel gear heat-treatment technology - Google Patents
Bevel gear heat-treatment technology Download PDFInfo
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- CN105648448A CN105648448A CN201410740996.XA CN201410740996A CN105648448A CN 105648448 A CN105648448 A CN 105648448A CN 201410740996 A CN201410740996 A CN 201410740996A CN 105648448 A CN105648448 A CN 105648448A
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Abstract
The invention discloses a bevel gear heat-treatment technology. The bevel gear heat-treatment technology is performed according to the steps of isothermal normalizing, carburization and quenching in sequence. By changing common normalizing into isothermal normalizing and changing a carburization process into two times of recrystallization, the bevel gear heat-treatment technology has the advantages that the heat treatment process of a bevel gear is greatly simplified and meanwhile the processing cost can be reduced.
Description
Technical field
The present invention relates to a kind of conical gear thermal treatment process.
Background technology
Conical gear is the transmission parts often used in power transmission, and it needs the thermal treatment through necessity to improve its every characteristic in process of production. Existing conical gear thermal treatment process comprises the steps such as common normalizing, carburizing, quenching, second-heating, again quenching, operates more various and cost of manufacture is higher. Prior art is badly in need of a kind of simple to operate, the conical gear thermal treatment process that cost is low.
Summary of the invention
It is an object of the invention to overcome in prior art the defect existed, it is provided that a kind of simple to operate, the conical gear thermal treatment process that cost is low.
For achieving the above object, the technical scheme of the present invention there is provided a kind of conical gear thermal treatment process, and described conical gear thermal treatment process carries out according to isothermal normalizing, carburizing and quenching step successively. By changing common normalizing into isothermal normalizing, cementation process changes into twice recrystallization can be simplified greatly by the heat treatment process of conical gear, can also reduce tooling cost simultaneously.
As preferably, described isothermal normalizing is incubated 60 minutes after first conical gear being preheated to 935 DEG C; Then conical gear is chilled to 650 DEG C soon by rapid cooling mode, it is incubated more than 120 minutes; Last naturally cooling or air-cooled cooling in atmosphere.
As preferably, described rapid cooling mode is that conical gear is placed in the combined cooling that then air sprays water smoke while air-cooled to conical gear.
As preferably, the described rapid cooling mode time length is within 30 minutes.
As preferably, described carburizing comprises the following steps:
The first step, is incubated 60 minutes after conical gear is preheated to 880 DEG C, keeps carbon gesture 0.8 during this; 2nd step, is incubated more than 60 minutes after conical gear is preheated to 925 DEG C, keeps carbon gesture 0.78��1.24 during this; 3rd step, is incubated 90 minutes after conical gear is cooled to 650 DEG C, keeps carbon gesture 0.78 during this; 4th step, is incubated 90 minutes after conical gear is heated to 840 DEG C again, keeps carbon gesture 0.78 during this.
As preferably, described quenching is referred to and is directly cooled by heat-eliminating medium by the conical gear of temperature after carburizing at 840 DEG C, and described heat-eliminating medium is water, salt solution, mineral oil or air. As preferably, described preheating method is electrically heated.
Advantage and the useful effect of the present invention are: by changing common normalizing into isothermal normalizing, and cementation process changes into twice recrystallization can be simplified greatly by the heat treatment process of conical gear, can also reduce tooling cost simultaneously.
Embodiment
Described isothermal normalizing is incubated 60 minutes after first conical gear being preheated to 935 DEG C; Then conical gear is chilled to 650 DEG C soon by rapid cooling mode, it is incubated more than 120 minutes; Last naturally cooling or air-cooled cooling in atmosphere.
Conical gear steel handled by the present invention are 17CrNiMo6, often adopt common normalizing pre-treatment in prior art, and workpiece directly cools after being heated to 935 DEG C of insulation 1h in atmosphere, owing to being Cr-Ni steel, therefore its hardening capacity is relatively good, just can obtain sorbite, Tuo Shi body in atmosphere, bainite mixed structure, its hardness value is higher, is unfavorable for follow-up cold working, and in addition perlite types of tissue owing to first being formed can slowly be grown up, what then formed is little, so its normalizing state uneven microstructure.And use the isothermal normalizing in invention to carry out pre-treatment, it is as cold as pearlitic transformation district soon after workpiece is heated to 935 DEG C of insulation 1h, requires according to hardness and select suitable isothermal temperature, it is possible to obtain uniform perlite types of tissue.
Therefore, select isothermal normalizing to have more uniform structure and properties, it is possible to better to carry out tissue for cold working backward and carburizing and quenching and prepare, and distorsion during quenching can be reduced.
Described rapid cooling mode is that conical gear is placed in the combined cooling that then air sprays water smoke while air-cooled to conical gear.
The described rapid cooling mode time length is within 30 minutes.
Described carburizing comprises the following steps:
The first step, is incubated 60 minutes after conical gear is preheated to 880 DEG C, keeps carbon gesture 0.8 during this; 2nd step, is incubated more than 60 minutes after conical gear is preheated to 925 DEG C, keeps carbon gesture 0.78��1.24 during this; 3rd step, is incubated 90 minutes after conical gear is cooled to 650 DEG C, keeps carbon gesture 0.78 during this; 4th step, is incubated 90 minutes after conical gear is heated to 840 DEG C again, keeps carbon gesture 0.78 during this.
Existing carburizing tech is under common normalizing preheating prerequisite, carry out carburizing operation, afterwards also will through second-heating and secondary quenching, the steel surface of gained is needle type martensite+a small amount of carbide+residual austenite, core portion is low-carbon lath martensite, similar with the result of gained of the present invention, but operation lacks loaded down with trivial details a lot. Carburizing mode of the present invention reasonably make use of secondary recrystallization principle, under the prerequisite avoiding coarse grain, abundant residues austenitic formation and metallographic structure and hardness, not only greatly save production cost, improve production efficiency, and do not need to carry out second-heating quenching, its stress is reduced relatively, and technique is more simple, decreases distorsion during quenching to a certain extent.
Described quenching is referred to and is directly cooled by heat-eliminating medium by the conical gear of temperature after carburizing at 840 DEG C, and described heat-eliminating medium is water, salt solution, mineral oil or air.
Described preheating method is electrically heated.
More than comprehensive, the best heat treatment in advance of 17CrNiMo6 steel is isothermal normalizing, obtains uniform perlite types of tissue, carries out tissue for carburizing and quenching and prepares. And carburizing quenching process is carburizing mode of the present invention, not only save the production time, but also reduce distorsion during quenching. Its tissue is followed successively by hypereutectoid layer: needle type martensite+a small amount of carbide+residual austenite, eutectoid layer: needle type martensite+residual austenite, hypoeutectoid layer: low carbon martensite+a small amount of tempering cryptocrystalline martensite, core portion: low carbon martensite+a small amount of ferrite. This tissue makes steel top layer have high hardness, wear resistance and contact fatigue strength, and core portion has enough intensity and plasticity toughness, meets the different performance requriements of piece surface and core portion.
The above is only the preferred embodiment of the present invention; it is noted that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also making some improvements and modifications, these improvements and modifications also should be considered as the protection domain of invention.
Claims (7)
1. a conical gear thermal treatment process, it is characterised in that: described conical gear thermal treatment process carries out according to isothermal normalizing, carburizing and quenching step successively.
2. conical gear thermal treatment process as claimed in claim 1, it is characterised in that: described isothermal normalizing is incubated 60 minutes after first conical gear being preheated to 935 DEG C;Then conical gear is chilled to 650 DEG C soon by rapid cooling mode, it is incubated more than 120 minutes; Last naturally cooling or air-cooled cooling in atmosphere.
3. conical gear thermal treatment process as claimed in claim 2, it is characterised in that: described rapid cooling mode is that conical gear is placed in the combined cooling that then air sprays water smoke while air-cooled to conical gear.
4. conical gear thermal treatment process as claimed in claim 3, it is characterised in that: the described rapid cooling mode time length is within 30 minutes.
5. conical gear thermal treatment process as claimed in claim 4, it is characterised in that: described carburizing comprises the following steps: the first step, is incubated 60 minutes, keeps carbon gesture 0.8 during this after conical gear is preheated to 880 DEG C; 2nd step, is incubated more than 60 minutes after conical gear is preheated to 925 DEG C, keeps carbon gesture 0.78��1.24 during this; 3rd step, is incubated 90 minutes after conical gear is cooled to 650 DEG C, keeps carbon gesture 0.78 during this; 4th step, is incubated 90 minutes after conical gear is heated to 840 DEG C again, keeps carbon gesture 0.78 during this.
6. conical gear thermal treatment process as claimed in claim 5, it is characterised in that: described quenching is referred to and is directly cooled by heat-eliminating medium by the conical gear of temperature after carburizing at 840 DEG C, and described heat-eliminating medium is water, salt solution, mineral oil or air.
7. conical gear thermal treatment process as claimed in claim 6, it is characterised in that: described preheating method is electrically heated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410740996.XA CN105648448A (en) | 2014-12-05 | 2014-12-05 | Bevel gear heat-treatment technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410740996.XA CN105648448A (en) | 2014-12-05 | 2014-12-05 | Bevel gear heat-treatment technology |
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| CN105648448A true CN105648448A (en) | 2016-06-08 |
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| CN201410740996.XA Pending CN105648448A (en) | 2014-12-05 | 2014-12-05 | Bevel gear heat-treatment technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217131A (en) * | 2017-05-19 | 2017-09-29 | 成都亨通兆业精密机械有限公司 | A kind of processing technology of camshaft |
| CN112226586A (en) * | 2020-10-20 | 2021-01-15 | 北京北方车辆集团有限公司 | Variable-temperature normalizing process method for small-size 42CrMo product |
| CN114836613A (en) * | 2022-04-01 | 2022-08-02 | 南京钢铁有限公司 | Method for preparing forged waste heat isothermal normalizing fine-grain gear |
-
2014
- 2014-12-05 CN CN201410740996.XA patent/CN105648448A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217131A (en) * | 2017-05-19 | 2017-09-29 | 成都亨通兆业精密机械有限公司 | A kind of processing technology of camshaft |
| CN112226586A (en) * | 2020-10-20 | 2021-01-15 | 北京北方车辆集团有限公司 | Variable-temperature normalizing process method for small-size 42CrMo product |
| CN114836613A (en) * | 2022-04-01 | 2022-08-02 | 南京钢铁有限公司 | Method for preparing forged waste heat isothermal normalizing fine-grain gear |
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Application publication date: 20160608 |
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| WD01 | Invention patent application deemed withdrawn after publication |