CN101994081A - Heat treatment method - Google Patents
Heat treatment method Download PDFInfo
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- CN101994081A CN101994081A CN2009100132156A CN200910013215A CN101994081A CN 101994081 A CN101994081 A CN 101994081A CN 2009100132156 A CN2009100132156 A CN 2009100132156A CN 200910013215 A CN200910013215 A CN 200910013215A CN 101994081 A CN101994081 A CN 101994081A
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- heat treatment
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Abstract
The invention relates to a heat treatment method in a heat treatment processing flow, which aims at providing a green heat treatment method having good quality (no oxidized black tissues) of workpieces after heat treatment, low energy consumption, quick penetrating rate and no pollution. A workpiece which needs to be thermally treated is put into a low-vacuum heat treatment furnace to carry out a surface chemical heat treatment process on the workpiece. The chemical heat treatment process is characterized by comprising the following steps of: firstly, pumping a vacuum furnace into a low vacuum mode, then, sucking or injecting a permeation agent (gas or liquid) into the furnace in order to quickly discharge air or waste gas (aging atmosphere) in the furnace; secondly, after the fresh permeation agent is quantitively, directionally and quickly diffuses in the furnace by a flow meter to enable the negative pressure in the furnace raise to normal pressure and continuously raise to positive pressure, maintaining a certain time at the positive pressure; and repeating the steps many times until the workpiece obtains a needed permeation layer.
Description
Technical field:
The present invention relates to a kind of heat treating method in the heat treatment process process.
Background technology:
At present, existing carburizing, carbonitriding are generally carried out under constant voltage, penetration enhancer in the burner hearth around the workpiece is a mobile, when fresh penetration enhancer advances burner hearth continuously, waste gas in the stove (aging atmosphere) continuously is discharged from outside the stove, take away a large amount of heat energy simultaneously, workpiece is finished the carburizing or carbonitriding process under constant voltage and penetration enhancer flow condition.This kind technology is owing to will constantly add fresh penetration enhancer, constantly waste gas is drained simultaneously, to keep carbon potential or nitrogen gesture in the burner hearth to meet the requirements, and the useful penetration enhancer of part pyritous also will be drained inevitably in the exhaust gas discharging process, like this, not only wasted penetration enhancer, the more important thing is and to consume a large amount of energy, simultaneously, owing to remain malleation in the burner hearth, remain between workpiece between slight gap waste gas (aging atmosphere) and be not easy to flow and obtain changing, make this part surface of workpiece can not obtain required infiltration layer, therefore, certain clearance must be kept between the workpiece in the burner hearth, output certainly will be influenced like this, in addition, blind hole is arranged on the workpiece, during micropore, because blind hole under constant voltage, waste gas in the micropore (aging atmosphere) can not be drained, and makes blind hole, micropore can not obtain required infiltration layer, as for the groove on the workpiece surface, if groove is very dark, then can not get required infiltration layer equally because of the waste gas in the groove can not obtain upgrading.
Summary of the invention:
Goal of the invention of the present invention be to provide the workpiece quality after a kind of thermal treatment good (the black tissue that non-oxidation generates), less energy consumption, infiltration rate soon, the heat treating method of pollution-free green.
Heat treating method of the present invention is achieved in that and comprises the heat treated workpiece of needs put in the airtight thermal treatment retort and to the workpiece in the thermal treatment retort and carry out the heat treated process of surface chemistry.The present invention compared with the prior art, owing to adopted the thermal treatment process of exhaust of rough vacuum transformation and malleation pressurization, be provided with water jacket on retort top, the valve tube of bleeding that connects with the furnace wall is arranged in the water jacket skill, bleed valve tube and the vacuum means atmosphere of drawing from water jacket is not easy to flow and obtains changing, air in the stove or waste gas (aging atmosphere) emptying quantitatively can be added penetration enhancer then; Penetration enhancer can be distributed to rapidly in the stove equably, and penetration enhancer is to enter quantitatively voluntarily in the retort and by blower fan to make furnace gas carry out internal recycle; Vacuum extractor adopts the water ring vacuum extractor, puts into sterilizing agent in the recirculated water of water ring vacuum extractor, carries out disinfection voluntarily behind the cyclic water tank of harmful furnace gas by the water ring vacuum extractor of extracting out in the retort; Sterilizing agent is ferrous sulfate or chlorinated lime.
Beneficial effect of the present invention:
Structure for simplified apparatus, the volume of reduction equipment, be provided with water jacket on retort top, the valve tube of bleeding that connects with the furnace wall is arranged in the water jacket skill, the bleed valve tube and the vacuum means atmosphere of drawing from water jacket) be not easy to flow and obtain changing, make this part surface of workpiece can not obtain required infiltration layer, therefore, must keep certain clearance between the workpiece in the burner hearth, certainly will influence output like this, in addition, on the workpiece blind hole is arranged, during micropore, owing to blind hole under constant voltage, waste gas in the micropore (aging atmosphere) can not be drained, make blind hole, micropore can not obtain required infiltration layer, as for the groove on the workpiece surface,, then can not get required infiltration layer equally because of the waste gas in the groove can not obtain upgrading if groove is very dark.After the penetration enhancer atmosphere in the retort was aging, vacuum pump started, and repeated first, second above-mentioned step then voluntarily, obtained required infiltration layer until workpiece, reached best thermal effectiveness.
Embodiment:
Heat treating method of the present invention is achieved in that and comprises the heat treated workpiece of needs put in the airtight heat treatment furnace and to the workpiece in the heat treatment furnace and carry out the heat treated process of surface chemistry that its special feature is that the thermo-chemical treatment process is such:
The first step: earlier retort is pumped into rough vacuum, then in retort, sucks or injection penetration enhancer (gas or liquid), so that rapidly air in the retort or waste gas (aging atmosphere) are discharged; In order to guarantee that said process can repeat repeatedly with air in the retort or waste gas (aging atmosphere) emptying; Pressure in the said process in the retort remains in the one 0.05 one 0.005MP scopes;
Second step: fresh penetration enhancer enters retort by under meter immediately quantitatively, directionally, rapidly under negative pressure, and be diffused into automatically in the retort everywhere, fresh penetration enhancer advances behind the stove jar pressure in the retort and is elevated to normal pressure from negative pressure and is elevated to malleation again, keep the atmosphere of regular hour in retort aging in malleation, the time that malleation keeps is 1 to 20 minute; After the penetration enhancer atmosphere in the retort was aging, vacuum pump started, and repeated first, second above-mentioned step then, obtained required infiltration layer until workpiece.
Sterilizing agent is ferrous sulfate or chlorinated lime.
Water jacket is the waste gas in valve tube cooling, prevents the seal washer Yin Gaowen below the retort lid and softening transform makes its loss of seal performance.
Claims (6)
1. heat treating method comprises the heat treated workpiece of needs put in the rough vacuum heat treatment furnace workpiece is carried out the heat treated process of surface chemistry, it is characterized in that the thermo-chemical treatment process is such:
The first step: earlier vacuum oven is pumped into rough vacuum, then in stove, sucks or injection penetration enhancer (gas or liquid), so that rapidly with air in the stove or waste gas (aging atmosphere) emptying;
Second step: fresh penetration enhancer passes through under meter immediately quantitatively, directionally, rapidly at the stove internal diffusion, makes the interior pressure of stove be elevated to normal pressure from negative pressure and is elevated to malleation again, keeps the regular hour in malleation; Above-mentioned steps repeats repeatedly to obtain required infiltration layer until workpiece.
2. heat treating method according to claim 1 is characterized in that the first step can repeat repeatedly air in retort or waste gas (aging atmosphere) emptying.
3. heat treating method according to claim 1 and 2, when it is characterized in that carrying out the first step, the pressure in the stove remains in the one 0.05 one 0.005MP scopes.
4. heat treating method according to claim 1 is characterized in that penetration enhancer makes furnace gases carry out internal recycle by blower fan in stove.
5. heat treating method according to claim 1, it is characterized in that vacuum extractor adopts the water ring vacuum extractor, in the recirculated water of water ring vacuum extractor, put into sterilizing agent, carry out disinfection voluntarily behind the cyclic water tank of harmful furnace gas of extracting out in the retort by the water ring vacuum extractor.
6. heat treating method according to claim 5 is characterized in that sterilizing agent can be ferrous sulfate or chlorinated lime.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100132156A CN101994081A (en) | 2009-08-18 | 2009-08-18 | Heat treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100132156A CN101994081A (en) | 2009-08-18 | 2009-08-18 | Heat treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101994081A true CN101994081A (en) | 2011-03-30 |
Family
ID=43784828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100132156A Pending CN101994081A (en) | 2009-08-18 | 2009-08-18 | Heat treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101994081A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106185850A (en) * | 2016-07-15 | 2016-12-07 | 合肥正帆电子材料有限公司 | Electron level arsenic hydride, hydrogen phosphide and the passivation process of gas mixture steel cylinder thereof |
| CN106676443A (en) * | 2016-12-15 | 2017-05-17 | 贵州安吉航空精密铸造有限责任公司 | Vacuum heat treatment technology for magnesium alloy casting |
| CN107448254A (en) * | 2017-06-20 | 2017-12-08 | 扬州光辉汽车零部件有限公司 | A kind of boronising wear-resistant coating valve |
| CN112095073A (en) * | 2020-08-20 | 2020-12-18 | 湖南申亿五金标准件有限公司 | QPQ treatment process with high toughness |
-
2009
- 2009-08-18 CN CN2009100132156A patent/CN101994081A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106185850A (en) * | 2016-07-15 | 2016-12-07 | 合肥正帆电子材料有限公司 | Electron level arsenic hydride, hydrogen phosphide and the passivation process of gas mixture steel cylinder thereof |
| CN106676443A (en) * | 2016-12-15 | 2017-05-17 | 贵州安吉航空精密铸造有限责任公司 | Vacuum heat treatment technology for magnesium alloy casting |
| CN107448254A (en) * | 2017-06-20 | 2017-12-08 | 扬州光辉汽车零部件有限公司 | A kind of boronising wear-resistant coating valve |
| CN112095073A (en) * | 2020-08-20 | 2020-12-18 | 湖南申亿五金标准件有限公司 | QPQ treatment process with high toughness |
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| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Jiang Hui Document name: Notification of Publication of the Application for Invention |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110330 |