CN105112634A - Heat treatment process for hot-working die - Google Patents
Heat treatment process for hot-working die Download PDFInfo
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- CN105112634A CN105112634A CN201510613268.7A CN201510613268A CN105112634A CN 105112634 A CN105112634 A CN 105112634A CN 201510613268 A CN201510613268 A CN 201510613268A CN 105112634 A CN105112634 A CN 105112634A
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Abstract
The invention discloses a heat treatment process for a hot-working die. The heat treatment process comprises the following steps: 1), primarily preheating: placing the die into a heat treatment furnace, heating to 560-600 DEG C and carrying out heat preservation for 1-2 h; 2), heating: heating the die to austenitizing temperature of die steel, introducing methanol into a heating furnace for protecting and carrying out heat preservation for 2-3 h; 3), carrying out gas quenching primarily: feeding the die into a gas quenching furnace for gas quenching; 4), tempering primarily: feeding the die into a tempering furnace with the temperature of 590-620 DEG C and carrying out heat preservation for 1-2 h; 5), carrying out gas quenching secondarily: feeding the die into the gas quenching furnace for gas quenching; 6), tempering secondarily: feeding the die into the tempering furnace with the temperature of 390-410 DEG C and carrying out heat preservation for 1-2 h; 7), carrying out oil quenching: feeding the die into an oil quenching furnace for oil quenching; 8), tempering for the third time: feeding the die into the tempering furnace with the temperature of 190-220 DEG C and carrying out heat preservation for 5-6 h so as to increase toughness;9), naturally cooling to room temperature. According to the invention, the temperature is increased section by section, so that the whole die is uniform in temperature and thermal stress and deformation are reduced effectively.
Description
Technical field
The present invention relates to technical field of heat treatment, specifically a kind of thermal treatment process of hot-work die.
Background technology
In recent years, along with the develop rapidly of China's equipment manufacture, Die Industry and die steel manufacturing enterprise all achieve significant progress, and meanwhile, the performance of hot-work industry to die steel is had higher requirement.Mould needs to heat-treat to strengthen its mechanical property.Traditional die & mold treatment technique, can avoid hardening break, and the structural state obtained based on martensite and higher strength property.But because the alloying element content of hot-work die steel is low, hardening capacity general, the region, heart portion of die steel will inevitably produce upper bainite tissue when oil quenchinng, and die steel size is larger, and the region shared by upper bainite tissue is larger.Cause the use properties of material significantly to reduce, worsen the impelling strength of die steel, exist mold use security and threaten.
Summary of the invention
The object of the present invention is to provide a kind of thermal treatment process of hot-work die, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
A thermal treatment process for hot-work die, step is as follows:
1) preliminary preheating: mould is placed in heat treatment furnace, is heated to 560-600 DEG C with the temperature rise rate of 120-200 DEG C/h, insulation 1-2 hour;
2) heat treated: austenitizing temperature mould being heated to die steel with the temperature rise rate of 80-100 DEG C/h, passes into methanol gas protection in process furnace, isothermal holding 2-3 hour;
3) once gas is quenched: by through step 2) mould after process sends in air-quenching furnace and carries out gas and to quench process, until the centre surface temperature of die-face reaches 600 ~ 650 DEG C;
4) tempering: mould is sent in the tempering stove of 590-620 DEG C, insulation 1-2 hour;
5) secondary gas is quenched: sent into by mould in air-quenching furnace and carry out gas and to quench process, until the centre surface temperature of die-face reaches 430 ~ 480 DEG C;
6) double tempering: mould is sent in the tempering stove of 390-410 DEG C, insulation 1-2 hour;
7) oil quenching process: sent into by mould in oil quenching furnace and carry out oil quenching process, until the centre surface temperature of die-face reaches 200 ~ 230 DEG C;
8) three tempering: the mould after oil quenching process is sent in 190-220 DEG C of tempering stove, insulation 5-6 hour, to increase toughness;
9) naturally cooling: mould is naturally cooled to room temperature.
As the further scheme of the present invention: step 2) in the austenitizing temperature of die steel be 780-900 DEG C.
Compared with prior art, the invention has the beneficial effects as follows: 1, the thermal treatment process temperature-gradient method of this hot-work die, make whole die temperature even, effectively reduce thermal stresses and distortion; 2, the thermal treatment process of this hot-work die adopts the quenching technology stage by stage of the different heat-eliminating medium of differing temps, has ensured the structure property of hot-work die steel; 3, the thermal treatment process of this hot-work die not direct cool to room temperature after quenching, and after being through third time tempering, just naturally cooling to room temperature, effectively reduce the tearing tendency of die quenching.
Embodiment
Be described in more detail below in conjunction with the technical scheme of embodiment to this patent.
Embodiment 1
A thermal treatment process for hot-work die, step is as follows:
1) preliminary preheating: mould is placed in heat treatment furnace, is heated to 570 DEG C with the temperature rise rate of 130 DEG C/h, be incubated 2 hours;
2) heat treated: mould is heated to 800 DEG C with the temperature rise rate of 80 DEG C/h, passes into methanol gas protection in process furnace, isothermal holding 2 hours;
3) once gas is quenched: by through step 2) mould after process sends in air-quenching furnace and carries out gas and to quench process, until the centre surface temperature of die-face reaches 610 DEG C;
4) tempering: sent into by mould in the tempering stove of 600 DEG C, is incubated 1 hour;
5) secondary gas is quenched: sent into by mould in air-quenching furnace and carry out gas and to quench process, until the centre surface temperature of die-face reaches 450 DEG C;
6) double tempering: sent into by mould in the tempering stove of 390 DEG C, is incubated 1 hour;
7) oil quenching process: sent into by mould in oil quenching furnace and carry out oil quenching process, until the centre surface temperature of die-face reaches 210 DEG C;
8) three tempering: sent into by the mould after oil quenching process in 200 DEG C of tempering stoves, are incubated 5 hours, to increase toughness;
9) naturally cooling: mould is naturally cooled to room temperature.
Embodiment 2
A thermal treatment process for hot-work die, step is as follows:
1) preliminary preheating: mould is placed in heat treatment furnace, is heated to 590 DEG C with the temperature rise rate of 180 DEG C/h, be incubated 2 hours;
2) heat treated: mould is heated to 870 DEG C with the temperature rise rate of 100 DEG C/h, passes into methanol gas protection in process furnace, isothermal holding 2.5 hours;
3) once gas is quenched: by through step 2) mould after process sends in air-quenching furnace and carries out gas and to quench process, until the centre surface temperature of die-face reaches 640 DEG C;
4) tempering: sent into by mould in the tempering stove of 610 DEG C, is incubated 2 hours;
5) secondary gas is quenched: sent into by mould in air-quenching furnace and carry out gas and to quench process, until the centre surface temperature of die-face reaches 470 DEG C;
6) double tempering: sent into by mould in the tempering stove of 410 DEG C, is incubated 2 hours;
7) oil quenching process: sent into by mould in oil quenching furnace and carry out oil quenching process, until the centre surface temperature of die-face reaches 220 DEG C;
8) three tempering: sent into by the mould after oil quenching process in 210 DEG C of tempering stoves, are incubated 6 hours, to increase toughness;
9) naturally cooling: mould is naturally cooled to room temperature.
Embodiment 3
A thermal treatment process for hot-work die, step is as follows:
1) preliminary preheating: mould is placed in heat treatment furnace, is heated to 580 DEG C with the temperature rise rate of 150 DEG C/h, be incubated 1.5 hours;
2) heat treated: mould is heated to 850 DEG C with the temperature rise rate of 90 DEG C/h, passes into methanol gas protection in process furnace, isothermal holding 2.5 hours;
3) once gas is quenched: by through step 2) mould after process sends in air-quenching furnace and carries out gas and to quench process, until the centre surface temperature of die-face reaches 630 DEG C;
4) tempering: sent into by mould in the tempering stove of 600 DEG C, is incubated 1.5 hours;
5) secondary gas is quenched: sent into by mould in air-quenching furnace and carry out gas and to quench process, until the centre surface temperature of die-face reaches 450 DEG C;
6) double tempering: sent into by mould in the tempering stove of 400 DEG C, is incubated 1.5 hours;
7) oil quenching process: sent into by mould in oil quenching furnace and carry out oil quenching process, until the centre surface temperature of die-face reaches 220 DEG C;
8) three tempering: sent into by the mould after oil quenching process in 210 DEG C of tempering stoves, are incubated 5.5 hours, to increase toughness;
9) naturally cooling: mould is naturally cooled to room temperature.
Embodiment 4
A thermal treatment process for hot-work die, step is as follows:
1) preliminary preheating: mould is placed in heat treatment furnace, is heated to 590 DEG C with the temperature rise rate of 140 DEG C/h, be incubated 2 hours;
2) heat treated: mould is heated to 820 DEG C with the temperature rise rate of 80 DEG C/h, passes into methanol gas protection in process furnace, isothermal holding 2 hours;
3) once gas is quenched: by through step 2) mould after process sends in air-quenching furnace and carries out gas and to quench process, until the centre surface temperature of die-face reaches 640 DEG C;
4) tempering: sent into by mould in the tempering stove of 590 DEG C, is incubated 2 hours;
5) secondary gas is quenched: sent into by mould in air-quenching furnace and carry out gas and to quench process, until the centre surface temperature of die-face reaches 440 DEG C;
6) double tempering: sent into by mould in the tempering stove of 390 DEG C, is incubated 1 hour;
7) oil quenching process: sent into by mould in oil quenching furnace and carry out oil quenching process, until the centre surface temperature of die-face reaches 230 DEG C;
8) three tempering: sent into by the mould after oil quenching process in 220 DEG C of tempering stoves, are incubated 6 hours, to increase toughness;
9) naturally cooling: mould is naturally cooled to room temperature.
Simultaneous test
Table 1 is by the mechanical performance data after traditional technology process hot-work die steel and by the mechanical performance data after the method process of embodiment 1, embodiment 2, embodiment 3 and embodiment 4, and table 2 is by the mechanical performance data after traditional technology process hot-work die steel and by the thermal fatigue property after the method process of embodiment 1, embodiment 2, embodiment 3 and embodiment 4.
Table 1 is mechanical property synopsis under steel hardness is HRC47-48 condition
| Performance | Tensile strength (MPa) | Ballistic work (J) |
| Prior heat treatment | 1610 | 15.8 |
| Embodiment 1 | 1660 | 16.8 |
| Embodiment 2 | 1690 | 17.0 |
| Embodiment 3 | 1685 | 16.9 |
| Embodiment 4 | 1655 | 16.7 |
Compared with traditional technology, the tensile strength of mould is on average improve 3.88% by the present invention, and ballistic work on average improves 6.64%.
Table 2 is thermal fatigue property synopsis (circulating 1000 times) under steel hardness is HRC47-48 condition
| State | 20-650℃ | 20-750℃ |
| Prior heat treatment | 11.4 | 13.9 |
| Embodiment 1 | 10.2 | 12.4 |
| Embodiment 2 | 9.9 | 12.1 |
| Embodiment 3 | 10 | 12.2 |
| Embodiment 4 | 10.4 | 12.6 |
Note: rank is according to Uddeholm standard rating.
Compared with traditional technology, the thermal fatigue property of mould is obtained reduction to a certain extent by the present invention.
The thermal treatment process temperature-gradient method of described hot-work die, makes whole die temperature even, effectively reduces thermal stresses and distortion; The thermal treatment process of described hot-work die adopts the quenching technology stage by stage of the different heat-eliminating medium of differing temps, has ensured the structure property of hot-work die steel; The thermal treatment process not direct cool to room temperature after quenching of described hot-work die, and after being through third time tempering, just naturally cooling to room temperature, effectively reduce the tearing tendency of die quenching.
Above the better embodiment of this patent is explained in detail, but this patent is not limited to above-mentioned embodiment, in the ken that one skilled in the relevant art possesses, various change can also be made under the prerequisite not departing from this patent aim.
Claims (2)
1. a thermal treatment process for hot-work die, is characterized in that, step is as follows:
1) preliminary preheating: mould is placed in heat treatment furnace, is heated to 560-600 DEG C with the temperature rise rate of 120-200 DEG C/h, insulation 1-2 hour;
2) heat treated: austenitizing temperature mould being heated to die steel with the temperature rise rate of 80-100 DEG C/h, passes into methanol gas protection in process furnace, isothermal holding 2-3 hour;
3) once gas is quenched: by through step 2) mould after process sends in air-quenching furnace and carries out gas and to quench process, until the centre surface temperature of die-face reaches 600 ~ 650 DEG C;
4) tempering: mould is sent in the tempering stove of 590-620 DEG C, insulation 1-2 hour;
5) secondary gas is quenched: sent into by mould in air-quenching furnace and carry out gas and to quench process, until the centre surface temperature of die-face reaches 430 ~ 480 DEG C;
6) double tempering: mould is sent in the tempering stove of 390-410 DEG C, insulation 1-2 hour;
7) oil quenching process: sent into by mould in oil quenching furnace and carry out oil quenching process, until the centre surface temperature of die-face reaches 200 ~ 230 DEG C;
8) three tempering: the mould after oil quenching process is sent in 190-220 DEG C of tempering stove, insulation 5-6 hour, to increase toughness;
9) naturally cooling: mould is naturally cooled to room temperature.
2. the thermal treatment process of hot-work die according to claim 1, is characterized in that, step 2) in the austenitizing temperature of die steel be 780-900 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510613268.7A CN105112634A (en) | 2015-09-23 | 2015-09-23 | Heat treatment process for hot-working die |
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| CN201510613268.7A CN105112634A (en) | 2015-09-23 | 2015-09-23 | Heat treatment process for hot-working die |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853363A (en) * | 2021-01-04 | 2021-05-28 | 安徽黄山恒久链传动有限公司 | Processing technology of high-strength die steel |
| CN113278776A (en) * | 2021-05-21 | 2021-08-20 | 无锡烨隆精密机械股份有限公司 | Hot core box stability improving process |
| CN113862432A (en) * | 2021-08-31 | 2021-12-31 | 大连环新精密特钢股份有限公司 | Carbon steel wire air quenching method and device |
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|---|---|---|---|---|
| JPS58141333A (en) * | 1982-02-16 | 1983-08-22 | Daido Steel Co Ltd | Heat treatment of forging |
| CN101649383A (en) * | 2009-09-02 | 2010-02-17 | 南方金康汽车零部件有限公司 | Heat treatment process for manufacturing mold of automotive rear longeron |
| CN101818234A (en) * | 2010-04-20 | 2010-09-01 | 广州市型腔模具制造有限公司 | Quenching process of H13 steel for compression molds |
| CN102676752A (en) * | 2012-05-08 | 2012-09-19 | 无锡宏达热处理锻造有限公司 | Thermal treatment process for die steel H13 of automobile forged piece |
| 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 |
| CN103014297A (en) * | 2012-11-27 | 2013-04-03 | 大连经济技术开发区圣洁真空技术开发有限公司 | Heat treatment technology for abrasion-resistant gear |
| CN103924045A (en) * | 2014-05-06 | 2014-07-16 | 大连圣洁真空技术开发有限公司 | Quenching heat treatment process for composite steel and composite steel obtained by adopting heat treatment process |
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2015
- 2015-09-23 CN CN201510613268.7A patent/CN105112634A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141333A (en) * | 1982-02-16 | 1983-08-22 | Daido Steel Co Ltd | Heat treatment of forging |
| CN101649383A (en) * | 2009-09-02 | 2010-02-17 | 南方金康汽车零部件有限公司 | Heat treatment process for manufacturing mold of automotive rear longeron |
| CN101818234A (en) * | 2010-04-20 | 2010-09-01 | 广州市型腔模具制造有限公司 | Quenching process of H13 steel for compression molds |
| CN102676752A (en) * | 2012-05-08 | 2012-09-19 | 无锡宏达热处理锻造有限公司 | Thermal treatment process for die steel H13 of automobile forged piece |
| 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 |
| CN103014297A (en) * | 2012-11-27 | 2013-04-03 | 大连经济技术开发区圣洁真空技术开发有限公司 | Heat treatment technology for abrasion-resistant gear |
| CN103924045A (en) * | 2014-05-06 | 2014-07-16 | 大连圣洁真空技术开发有限公司 | Quenching heat treatment process for composite steel and composite steel obtained by adopting heat treatment process |
Non-Patent Citations (1)
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| 崔忠圻: "《金属学与热处理》", 30 November 1989, 机械工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853363A (en) * | 2021-01-04 | 2021-05-28 | 安徽黄山恒久链传动有限公司 | Processing technology of high-strength die steel |
| CN113278776A (en) * | 2021-05-21 | 2021-08-20 | 无锡烨隆精密机械股份有限公司 | Hot core box stability improving process |
| CN113862432A (en) * | 2021-08-31 | 2021-12-31 | 大连环新精密特钢股份有限公司 | Carbon steel wire air quenching method and device |
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Application publication date: 20151202 |