CN101538643A - Process for quenching H13 steel by high-pressure gas stepped quick cooling - Google Patents
Process for quenching H13 steel by high-pressure gas stepped quick cooling Download PDFInfo
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- CN101538643A CN101538643A CN200810034906A CN200810034906A CN101538643A CN 101538643 A CN101538643 A CN 101538643A CN 200810034906 A CN200810034906 A CN 200810034906A CN 200810034906 A CN200810034906 A CN 200810034906A CN 101538643 A CN101538643 A CN 101538643A
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Abstract
The invention relates to a process for quenching H13 steel by high-pressure gas stepped quick cooling. The near surface and the heart part of a workpiece are provided with a thermoelectric couple respectively; after heat preservation at an austenitizing temperature is finished, the quick cooling is performed; when the surface temperature reaches 400 to 450 DEG C, the gas cooling capability is reduced by adjusting gas pressure and/or gas flow rate; and when the temperature of the heart part reaches 400 to 450 DEG C, the gas cooling capability is increased by adjusting the gas pressure and/or the gas flow rate until the quenching is finished. The technological method ensures that the workpiece enters a slow cooling state upon stepping and is quickly cooled at the end of stepping; and an H13 mold processed by the quenching process has the characteristics of little deformation, excellent organization and good performance.
Description
Technical field
The present invention relates to a kind of thermal treatment process, relate in particular to a kind of quenching technology.
Background technology
Along with the development of automotive industry and related industries, the application of die casting is more and more, and the H13 steel is present domestic most widely used die casting steel, and the life-span of therefore improving the H13 transfer mold has very great economic and social benefit.Present domestic vacuum high-pressure technology and equipment development provides equipment guarantee for the high-quality thermal treatment of H13 steel rapidly.
At present, the mode of the high pressure gas quenching of H13 steel is when the austenitizing temperature insulation finishes, and cools off fast by adjustments of gas pressure and flow velocity, finishes up to quenching, easy like this distortion or the cracking of causing.In order to reduce distortion, developed stepped quenching by high pressure gas technology, stepped quenching by high pressure gas technology is to cool off fast in the starting stage of quenching, avoid successive transformation curve " nose ", avoid austenite structure to ferrite and pearlite transformation, when the part temperature reaches martensite and begins transition point, reduce gaseous tension and flow velocity cools off at a slow speed, dwindle the workpiece internal-external temperature difference, make workpiece evenly finish the transformation of tissue.This technology can produce more austenite when reducing to be out of shape, more bainite structure, and less quenched martensite tissue also produces bigger residual compressive stress, is unfavorable for the work-ing life of mould.
Summary of the invention
Technical problem to be solved by this invention provide a kind of can reduce to be out of shape also can produce more quenched martensite tissue, help improving the H13 steel high pressure gas quenching technology of die life.
The present invention solves the problems of the technologies described above the technical scheme that adopts to be:
H13 steel high pressure gas quenching technology, adopt the stepped quick cooling quenching technology, respectively be provided with thermopair on nearly surface of workpiece and heart portion, after the austenitizing temperature insulation finishes, cool off fast, when surface temperature reaches 400 ℃-450 ℃, reduce the gas cooling ability by adjustments of gas pressure and/or gas flow rate, when reaching 400 ℃-450 ℃, increase the gas cooling ability by adjustments of gas pressure and/or gas flow rate again, finish up to quenching Deng heart portion temperature.
The quenching technology of high-pressure gas stepped quick cooling provided by the invention, employing respectively is provided with thermopair on nearly surface of workpiece and heart portion, when being quickly cooled to surface temperature from austenitizing temperature, workpiece reaches 400 ℃-450 ℃, reduce speed of cooling, implement quick cooling when also reaching 400 ℃-450 ℃ again Deng the temperature of workpiece heart portion, this processing method has adopted the surface of the quantitative observing and controlling heat treated part of thermopair and the actual temperature of heart portion, guarantee to enter when workpiece begins classification the slow cooling state, classification is promptly cooled off after finishing fast.
Because in the marquenching process, reduced speed of cooling, make residual austenite that stabilization take place, cooling fast after the vacuum high pressure gas quenching classification, thereby fast by the bainite transformation district, minimizing can worsen the generation of the bainite structure of steel mechanical property, the quenched martensite that changes into as much as possible.
In addition because at present, the cooling power of high-pressure gas quenching furnace (pressure is not more than 0.6MPa) is less relatively, after quenching based on thermal stresses, workpiece (especially larger-size workpiece) surface can produce bigger residual compressive stress like this, easily makes workpiece produce bigger distortion, and cools off fast after the classification, then can produce more structural stress, offset portion of hot stress, make workpiece surface produce less residual compressive stress
The H13 mould that adopts quenching technology of the present invention to handle, it is little to have a distortion, organize good, the characteristics that performance is good.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is a H13 steel high-pressure gas stepped quick cooling quenching technology curve.
Embodiment
Fig. 1 shows H13 steel workpiece high-pressure gas stepped quick cooling quenching technology curve, before implementing, quenching technology at first one thermopair respectively is set on nearly surface of workpiece and heart portion, after the austenitizing temperature insulation finishes, cool off fast, when surface temperature reaches 430 ℃, with 430 ℃ as hierarchical temperature, reduce the gas cooling ability by adjustments of gas pressure and/or gas flow rate, reach or during near 430 ℃, increase the gas cooling ability Deng heart portion temperature, finish up to quenching.
Through the workpiece that above-mentioned high-pressure gas stepped quick cooling quenching technology is handled, unrelieved stress is significantly less than the unrelieved stress of conventional vacuum heat treatment process, and the tendency that more little its distortion of the unrelieved stress of workpiece and crackle produce is just more little.
Simultaneously, because the difference hierarchical temperature of other conditions can slightly change, the hierarchical temperature of H13 steel is 400 ℃-450 ℃ (same quenching technology workpiece carries out quench treatment with 400 ℃, 450 ℃ as hierarchical temperature respectively, can both finish satisfactory thermal treatment).
Claims (1)
1. the quenching technology of a H13 steel high-pressure gas stepped quick cooling adopts the stepped quick cooling quenching technology, and its feature exists:
Respectively be provided with thermopair on nearly surface of workpiece and heart portion, after the austenitizing temperature insulation finishes, cool off fast, when surface temperature reaches 400 ℃-450 ℃, reduce the gas cooling ability by adjustments of gas pressure and/or gas flow rate, when reaching 400 ℃-450 ℃, increase the gas cooling ability by adjustments of gas pressure and/or gas flow rate again, finish up to quenching Deng heart portion temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200810034906A CN101538643A (en) | 2008-03-20 | 2008-03-20 | Process for quenching H13 steel by high-pressure gas stepped quick cooling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810034906A CN101538643A (en) | 2008-03-20 | 2008-03-20 | Process for quenching H13 steel by high-pressure gas stepped quick cooling |
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| CN101538643A true CN101538643A (en) | 2009-09-23 |
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| CN200810034906A Pending CN101538643A (en) | 2008-03-20 | 2008-03-20 | Process for quenching H13 steel by high-pressure gas stepped quick cooling |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102808188A (en) * | 2012-09-11 | 2012-12-05 | 上海汽车变速器有限公司 | Gas carburizing and quenching technology for annular gears of transmissions |
| CN103255269A (en) * | 2013-04-02 | 2013-08-21 | 广州市型腔模具制造有限公司 | Quench cooling process for H13 steel |
| CN103668026A (en) * | 2013-12-13 | 2014-03-26 | 无锡透平叶片有限公司 | Quasi beta thermal treatment technology of TC4-DT titanium alloy structural component |
| CN105400932A (en) * | 2010-03-25 | 2016-03-16 | 株式会社Ihi | Heat Treatment Method |
| CN107739790A (en) * | 2017-11-01 | 2018-02-27 | 广东和胜工业铝材股份有限公司 | Heat treatment method and vacuum high-pressure the air cooling stove of extrusion die |
| CN109321716A (en) * | 2018-11-20 | 2019-02-12 | 上海电气上重铸锻有限公司 | A kind of large size medium and low carbon steel forging shaft surface hardening heat-treating methods |
| CN111719114A (en) * | 2019-03-21 | 2020-09-29 | 上海汽车变速器有限公司 | Gas quenching method for controlling part aperture shrinkage |
-
2008
- 2008-03-20 CN CN200810034906A patent/CN101538643A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105400932A (en) * | 2010-03-25 | 2016-03-16 | 株式会社Ihi | Heat Treatment Method |
| CN102808188A (en) * | 2012-09-11 | 2012-12-05 | 上海汽车变速器有限公司 | Gas carburizing and quenching technology for annular gears of transmissions |
| CN102808188B (en) * | 2012-09-11 | 2014-10-15 | 上海汽车变速器有限公司 | Gas carburizing and quenching technology for annular gears of transmissions |
| CN103255269A (en) * | 2013-04-02 | 2013-08-21 | 广州市型腔模具制造有限公司 | Quench cooling process for H13 steel |
| CN103255269B (en) * | 2013-04-02 | 2014-07-09 | 广州市型腔模具制造有限公司 | Quench cooling process for H13 steel |
| CN103668026A (en) * | 2013-12-13 | 2014-03-26 | 无锡透平叶片有限公司 | Quasi beta thermal treatment technology of TC4-DT titanium alloy structural component |
| CN103668026B (en) * | 2013-12-13 | 2016-03-02 | 无锡透平叶片有限公司 | A kind of beta-phase transformation point thermal treatment process of TC4-DT titanium alloy structure part |
| CN107739790A (en) * | 2017-11-01 | 2018-02-27 | 广东和胜工业铝材股份有限公司 | Heat treatment method and vacuum high-pressure the air cooling stove of extrusion die |
| CN109321716A (en) * | 2018-11-20 | 2019-02-12 | 上海电气上重铸锻有限公司 | A kind of large size medium and low carbon steel forging shaft surface hardening heat-treating methods |
| CN111719114A (en) * | 2019-03-21 | 2020-09-29 | 上海汽车变速器有限公司 | Gas quenching method for controlling part aperture shrinkage |
| CN111719114B (en) * | 2019-03-21 | 2023-04-28 | 上海汽车变速器有限公司 | Gas quenching method for controlling aperture shrinkage of part |
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Open date: 20090923 |