CN102925903B - Heat treatment method for die-casting die - Google Patents
Heat treatment method for die-casting die Download PDFInfo
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- CN102925903B CN102925903B CN201210366288.5A CN201210366288A CN102925903B CN 102925903 B CN102925903 B CN 102925903B CN 201210366288 A CN201210366288 A CN 201210366288A CN 102925903 B CN102925903 B CN 102925903B
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Abstract
The invention discloses a heat treatment method for a die-casting die. The heat treatment method for the die-casting die which is made of H13 steel and used for producing a copper alloy tap, comprises the following steps of: A, a quenching phase: a) placing the die-casting die in a vacuum high-pressure gas-quenching furnace to perform staged heating and heat insulating; b) charging N2 in the vacuum high-pressure gas-quenching furnace to cool the die-casting die to 470-550 DEG C, and insulating heat for 25-40 minutes; and c) cooling the die-casting die to 95-115 DEG C, and turning into a tempering furnace; B, a tempering phase; and C, a nitrocarburizing phase: placing the die-casting die in a vacuum furnace having an interior temperature of 550-600 DEG C, charging methanol and NH3, and reacting for 4-6 hours. The die-casting die is cooled to 470-550 DEG C and insulated for 25-40 minutes, thus reducing thermal stress and thermal-stress stress; and the die-casting die is placed in the vacuum furnace to be subjected to nitrocarburizing, thus improving the wear resistance and the anti-fatigue performance of the surface of the die-casting die.
Description
Technical field
The present invention relates to a kind of heat treating method of transfer mold.
Background technology
Transfer mold due to cavity shape complexity, difficulty of processing is large, the manufacturing cycle is long, mold performance require high, and transfer mold always heat-treats in the situation that cavity shape has approached or approach design tolerance, thus take effective heat treatment technics guarantee transfer mold quality, prevent that the distortion of transfer mold from just seeming quite important.
The application of transfer mold is more and more, and H13 steel is the widest transfer mold steel of current domestic application.At present, the gas mode of quenching that H13 is firm is when austenitizing temperature insulation finishes, and is undertaken coolingly fast by adjustments of gas pressure and flow velocity, until quench, finishes, and easily like this causes larger distortion, makes transfer mold internal stress excessive.When transfer mold is subject to high-temp liquid repeated stock and huge transfer force effect, easily there is be full of cracks, and progressively expand or occur spot corrosion and peel off after certain die casting number of times, even press and fall into, thus inefficacy in advance.Therefore, the work-ing life of transfer mold is quite short at present.
Summary of the invention
The invention provides a kind of heat treating method of transfer mold, can extend the use casting life of transfer mold.The technical solution adopted for the present invention to solve the technical problems is:
A heat treating method for transfer mold, transfer mold material is that H13 is firm, and transfer mold is for the production of copper alloy water tap, and it comprises the following steps:
A, quenching stage
A) transfer mold is placed in to high-pressure gas quenching furnace and carries out classification heating and insulation;
B) to high-pressure gas quenching furnace, be filled with N
2transfer mold is cooled to 470 ℃-550 ℃, insulation 25-40 minute;
C) transfer mold is cooled to 95 ℃-115 ℃, proceeds to tempering stove;
B, tempering stage
C, carbonitriding stage
Transfer mold is placed in vacuum oven, and in stove, 550 ℃-600 ℃ of temperature, are filled with methyl alcohol and NH
3, reaction 4-6 hour.
Among one preferred embodiment: methyl alcohol accounts for 40%-60%, NH
3account for 40%-60%, methyl alcohol and NH
3add up to very.
Among one preferred embodiment: in the carbonitriding stage, methyl alcohol accounts for 50%, NH
3account for 50%, in stove, 570 ℃ of temperature, react 4.5 hours.
Among one preferred embodiment: carbonitriding compound layer depth 9-10 μ m.
Among one preferred embodiment: carbonitriding compound diffusion layer depth 0.2-0.3mm.
Among one preferred embodiment: transfer mold surface hardness 1100HV0.1.
Among one preferred embodiment: the step in the stage of quenching a) in classification be heated to be: with 160 ℃/h-200 ℃/h, be warmed up to 620 ℃-650 ℃, insulation 40-90 minute; Then with 160 ℃/h-200 ℃/h, be warmed up to 820 ℃-850 ℃, insulation 40-60 minute; Then be warmed up to 1010 ℃-1050 ℃, insulation (15+ material thickness/2) minute.
Among one preferred embodiment: the step in the stage of quenching a) middle classification is heated to be: be warmed up to 620 ℃ with 200 ℃/h, be incubated 50 minutes; Then with 165 ℃/h, be warmed up to 820 ℃, be incubated 45 minutes; Then be warmed up to 1030 ℃, insulation (15+ material thickness/2) minute.
Among one preferred embodiment: when the tempering stage finishes, transfer mold surface hardness is 46-48HRc.
Among one preferred embodiment: in the quenching stage, the pressure of high-pressure gas quenching furnace is 0.6MPa-0.8MPa.
The technical program is compared with background technology, and its tool has the following advantages:
Transfer mold is cooled to 470 ℃-550 ℃, in this temperature province, cross cold martensite very stable, long period insulation does not undergo phase transition, insulation 25-40 minute, dwindle transfer mold inner poor with outside temperature, reduce thermal stresses and transformation stress, to reach the object of Reducing distortion, raising transfer mold intensity; Transfer mold is placed in carbonitriding in vacuum oven, has improved wear resistance and the anti-fatigue performance on transfer mold surface, guarantees that transfer mold life-time service does not chap, do not peel off.Therefore, the heat treating method of transfer mold of the present invention has advantages of the use casting life that extends transfer mold.
Embodiment
The heat treating method of a kind of transfer mold of the present invention, is for being that the transfer mold that H13 is firm is heat-treated to material, thereby improves the work-ing life of transfer mold.Described transfer mold is for the production of copper alloy water tap.
Embodiment mono-
The heat treating method of transfer mold, it comprises the following steps:
A, quenching stage
A) transfer mold being placed in to pressure is that the high-pressure gas quenching furnace of 0.6MPa carries out classification heating and insulation;
Concrete: with 160 ℃/h, be warmed up to 620 ℃, be incubated 40 minutes; Then with 160 ℃/h, be warmed up to 820 ℃, be incubated 40 minutes; Then be warmed up to 1010 ℃, insulation (15+ material thickness/2) minute, if moulding stock thickness is Dmm, soaking time is (15+D/2) minute.
B) to high-pressure gas quenching furnace, be filled with N
2transfer mold is cooled to 470 ℃, is incubated 25 minutes;
C) transfer mold is cooled to 95 ℃, proceeds to tempering stove;
B, tempering stage
580 ℃ of tempering temperatures, after tempering, transfer mold surface hardness is about 50-52HRc.
C, carbonitriding stage
Transfer mold is placed in vacuum oven, and in stove, 550 ℃ of temperature, are filled with 40% methyl alcohol and 60%NH
3, react 4 hours.The about 9-10 μ of carbonitriding compound layer depth m.The about 0.2-0.3mm of carbonitriding compound diffusion layer depth.Transfer mold surface hardness is 1100HV0.1.
Embodiment bis-
The heat treating method of transfer mold, it comprises the following steps:
A, quenching stage
A) transfer mold being placed in to pressure is that the high-pressure gas quenching furnace of 0.8MPa carries out classification heating and insulation;
Concrete: with 200 ℃/h, be warmed up to 650 ℃, be incubated 90 minutes; Then with 200 ℃/h, be warmed up to 850 ℃, be incubated 60 minutes; Then be warmed up to 1050 ℃, insulation (15+ material thickness/2) minute, if moulding stock thickness is Dmm, soaking time is (15+D/2) minute.
B) to high-pressure gas quenching furnace, be filled with N
2transfer mold is cooled to 550 ℃, is incubated 40 minutes;
C) transfer mold is cooled to 115 ℃, proceeds to tempering stove;
B, tempering stage
630 ℃ of tempering temperatures, after tempering, transfer mold surface hardness is about 41-43HRc.
C, carbonitriding stage
Transfer mold is placed in vacuum oven, and in stove, 550 ℃ of temperature, are filled with 60% methyl alcohol and 40%NH
3, react 6 hours.The about 9-10 μ of carbonitriding compound layer depth m.The about 0.2-0.3mm of carbonitriding compound diffusion layer depth.Transfer mold surface hardness is 1100HV0.1.
Embodiment tri-
The heat treating method of transfer mold, it comprises the following steps:
A, quenching stage
A) transfer mold being placed in to pressure is that the high-pressure gas quenching furnace of 0.6MPa carries out classification heating and insulation;
Concrete: with 200 ℃/h, be warmed up to 620 ℃, be incubated 50 minutes; Then with 165 ℃/h, be warmed up to 820 ℃, be incubated 45 minutes; Then be warmed up to 1030 ℃, insulation (15+ material thickness/2) minute, if moulding stock thickness is Dmm, soaking time is (15+D/2) minute.
B) to high-pressure gas quenching furnace, be filled with N
2transfer mold is cooled to 500 ℃, is incubated 30 minutes;
C) transfer mold is cooled to 100 ℃, proceeds to tempering stove;
B, tempering stage
600 ℃ of tempering temperatures, after tempering, transfer mold surface hardness is about 46-48HRc.
C, carbonitriding stage
Transfer mold is placed in vacuum oven, and in stove, 570 ℃ of temperature, are filled with 50% methyl alcohol and 50%NH
3, react 4.5 hours.The about 9-10 μ of carbonitriding compound layer depth m.The about 0.2-0.3mm of carbonitriding compound diffusion layer depth.Transfer mold surface hardness is 1100HV0.1.
Adopt heat treating method of the present invention to heat-treat transfer mold, can make the life-span of transfer mold reach 15-20 ten thousand times, be far longer than 100,000 times of prior art level.
The above, only for preferred embodiment of the present invention, therefore can not limit according to this scope of the invention process, the equivalence of doing according to the scope of the claims of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (9)
1. a heat treating method for transfer mold, transfer mold material is H13 steel, and transfer mold, for the production of copper alloy water tap, is characterized in that, and it comprises the following steps:
A, quenching stage
A) transfer mold is placed in to high-pressure gas quenching furnace and carries out classification heating and insulation, described classification is heated to be: with 160 ℃/h-200 ℃/h, be warmed up to 620 ℃-650 ℃, insulation 40-90 minute; Then with 160 ℃/h-200 ℃/h, be warmed up to 820 ℃-850 ℃, insulation 40-60 minute; Then be warmed up to 1010 ℃-1050 ℃, insulation 15+ material thickness/2 minute;
B) to high-pressure gas quenching furnace, be filled with N
2transfer mold is cooled to 470 ℃-550 ℃, insulation 25-40 minute;
C) transfer mold is cooled to 95 ℃-115 ℃, proceeds to tempering stove;
B, tempering stage
580 ℃ or 600 ℃ or 630 ℃ of tempering temperatures;
C, carbonitriding stage
Transfer mold is placed in vacuum oven, and in stove, 550 ℃-600 ℃ of temperature, are filled with methyl alcohol and NH
3, reaction 4-6 hour.
2. the heat treating method of a kind of transfer mold according to claim 1, is characterized in that: methyl alcohol accounts for 40%-60% NH
3account for 40%-60%, methyl alcohol and NH
3add up to very.
3. the heat treating method of a kind of transfer mold according to claim 2, is characterized in that: in the carbonitriding stage, methyl alcohol accounts for 50%, NH
3account for 50%, in stove, 570 ℃ of temperature, react 4.5 hours.
4. the heat treating method of a kind of transfer mold according to claim 3, is characterized in that: carbonitriding compound layer depth 9-10 μ m.
5. the heat treating method of a kind of transfer mold according to claim 3, is characterized in that: carbonitriding compound diffusion layer depth 0.2-0.3mm.
6. the heat treating method of a kind of transfer mold according to claim 3, is characterized in that: transfer mold surface hardness 1100HV0.1.
7. the heat treating method of a kind of transfer mold according to claim 1, is characterized in that: the step in the stage of quenching a) middle classification is heated to be: with 200 ℃/h, be warmed up to 620 ℃, be incubated 50 minutes; Then with 165 ℃/h, be warmed up to 820 ℃, be incubated 45 minutes; Then be warmed up to 1030 ℃, insulation 15+ material thickness/2 minute.
8. the heat treating method of a kind of transfer mold according to claim 7, is characterized in that: when the tempering stage finishes, transfer mold surface hardness is 46-48HRC.
9. the heat treating method of a kind of transfer mold according to claim 8, is characterized in that: in the quenching stage, the pressure of high-pressure gas quenching furnace is 0.6MPa-0.8MPa.
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|---|---|---|---|
| CN201210366288.5A CN102925903B (en) | 2012-09-27 | 2012-09-27 | Heat treatment method for die-casting die |
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| CN201210366288.5A CN102925903B (en) | 2012-09-27 | 2012-09-27 | Heat treatment method for die-casting die |
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| CN102925903B true CN102925903B (en) | 2014-04-16 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372351A (en) * | 2014-11-14 | 2015-02-25 | 无锡阳工机械制造有限公司 | Heat treatment method for die-casting mould |
| CN104372353A (en) * | 2014-11-14 | 2015-02-25 | 无锡阳工机械制造有限公司 | Heat treatment method for die-casting mould |
| CN104372352A (en) * | 2014-11-14 | 2015-02-25 | 无锡阳工机械制造有限公司 | Heat treatment method for die-casting mould |
| CN105002458A (en) * | 2015-08-06 | 2015-10-28 | 潘桂枝 | Gaseous carbonitriding method of steel |
| CN107723631A (en) * | 2017-09-01 | 2018-02-23 | 东风精密铸造安徽有限公司 | A kind of compression mod heat-treatment technology 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 |
| CN109128734A (en) * | 2018-10-15 | 2019-01-04 | 苏州金瑞阳模具有限公司 | A kind of processing method of OEM aluminum-alloy wheel casting mould bed die |
| CN112157929B (en) * | 2020-09-25 | 2022-07-08 | 湖南科嘉新材料有限公司 | Hot-press forming and demoulding method for short fiber reinforced carbon/resin composite material |
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| EP0249855A1 (en) * | 1986-06-18 | 1987-12-23 | Carpenter Technology Corporation | Hot work tool steel |
| CN101928912A (en) * | 2010-08-31 | 2010-12-29 | 华南理工大学 | Low temperature carburization method of hot-working die steel |
| CN102021588A (en) * | 2010-12-04 | 2011-04-20 | 江苏飞船股份有限公司 | 20Cr2Ni4A steel carburizing and nitrocarburizing multiplex heat treatment process |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4696975B2 (en) * | 2006-03-03 | 2011-06-08 | 日本精工株式会社 | Rolling bearing |
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|---|---|---|---|---|
| EP0249855A1 (en) * | 1986-06-18 | 1987-12-23 | Carpenter Technology Corporation | Hot work tool steel |
| CN101928912A (en) * | 2010-08-31 | 2010-12-29 | 华南理工大学 | Low temperature carburization method of hot-working die steel |
| CN102021588A (en) * | 2010-12-04 | 2011-04-20 | 江苏飞船股份有限公司 | 20Cr2Ni4A steel carburizing and nitrocarburizing multiplex heat treatment process |
| 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 |
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