CN109161644A - A kind of heavy die block mould steel process for quenching - Google Patents
A kind of heavy die block mould steel process for quenching Download PDFInfo
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- CN109161644A CN109161644A CN201811053850.2A CN201811053850A CN109161644A CN 109161644 A CN109161644 A CN 109161644A CN 201811053850 A CN201811053850 A CN 201811053850A CN 109161644 A CN109161644 A CN 109161644A
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- die block
- quenching
- heavy die
- temperature
- mould steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The heavy die block mould steel process for quenching that the present invention designs, it is characterised in that: heavy die block mould steel to be processed is heated to austenitic temperature section and keeps the temperature 8~9 hours；Water cooling simultaneously controls center portion temperature, hangs out the air-cooled self tempering of heavy die block mould steel to be processed；Repeatedly water cooling, it is four times air-cooled after so that the center portion temperature of heavy die block mold to be processed reach martensite start temperature complete quenching.Intensity of cooling of the present invention guarantees to avoid water quenching cracking while heavy die block through hardening between oil quenching and water quenching.It takes multiple water lift to slow down cooling velocity, reduces quenching stress, also prevent hardening break while improving high temperature section cooling velocity.Structural stress can be reduced greatly, and low-temperature zone is avoided to crack.
Description
Technical field
The invention belongs to technical field of heat treatment, and in particular to a kind of 1.2738 heavy die block mould steel process for quenching.
Background technique
1.2738 mould steel are the materials applied to production Bulk plastic mold, are required uniformity of hardness very harsh.
The quenching-and-tempering process of the material generally comprises: heating, heat preservation, quenching, high tempering easily occur during quenched
Following problems: 1. hardness are uneven；2. quenching easy to crack；3. comprehensive mechanical performance is unqualified.Material usually is forged to small-sized 1.2738,
Oil quenching generally can be used to improve material property.And if will appear as 1.2738 heavy die block using traditional oil quenching and quench
Impermeable, heart table difference of hardness is larger, or even center portion occurs without hardness phenomenon.In addition oil quenching is at high cost, and safety is poor, pollution also compared with
Greatly, therefore for plastic die steels such as large sizes 1.2738 using oil quenching mode there are significant limitations.
Summary of the invention
Background technique there are aiming at the problem that, be the purpose of the present invention is to provide a kind of for 1.2738 mould steel
The heavy die block oil quenching big problem easy to crack of impermeable, water quenching cooling intensity of quenching proposes a kind of to substitute using water quenching+air quenching technique
Oil quenching mode simultaneously solves the problems, such as water quenching heavy die block mould steel process for quenching easy to crack.
In order to achieve the above objectives, the heavy die block mould steel process for quenching that the present invention designs, it is characterised in that: will be to be processed
Heavy die block mould steel be heated to austenitic temperature section and keep the temperature 8~9 hours；Water cooling simultaneously controls center portion temperature, hang out to
The air-cooled self tempering of heavy die block mould steel of processing；Repeatedly water cooling, it is four times air-cooled after so that heavy die block mold to be processed
Center portion temperature reaches martensite start temperature and completes quenching.
Preferably, enter for the first time water water cooling 42~48 minutes, control 500 DEG C of center portion temperature, air-cooled 3 minutes, rise again 350
℃；
Preferably, enter for the second time water water cooling 12~15 minutes, control 400 DEG C of center portion temperature, air-cooled 2 minutes, rise again 300
℃；
Preferably, enter for the third time water water cooling 10~12 minutes, control 300 DEG C of center portion temperature, air-cooled 2 minutes, rise again 260
℃；
Preferably, enter water water cooling 7~10 minutes the 4th time, control 250 DEG C of center portion temperature, air-cooled 2 minutes, rise again 230 DEG C.
Preferably, tempering temperature is the surface temperature of heavy die block mold to be processed.
Preferably, water cooling uses and heavy die block mold to be processed is completely immersed in water, and controlling water velocity is 45
~50L/min.
The beneficial effects of the present invention are: 1. by the way of water quenching and air cooling, the multiple air-cooled carry out self tempering of water lift eliminates table
Covering weave changes stress, and intensity of cooling guarantees that avoiding water quenching while heavy die block through hardening opens between oil quenching and water quenching
It splits.2.1.2738 pearlite nose transition temperature is 580 DEG C, is directly cooled to 500 DEG C of center portion water outlets fastly for the first time, avoids hardening
There is perlitic transformation.It takes multiple water lift to slow down cooling velocity later, reduces quenching stress, improve high temperature section cooling velocity
Hardening break is also prevented simultaneously.3. be cooled to 1.2738 martensite start temperature, progress is air-cooled, slows down martensite
Formation speed avoid low-temperature zone from cracking so as to reduce structural stress greatly.
Specific embodiment
It is (including preferred to technical solution of the present invention below by the mode for enumerating some alternative embodiments of the invention
Technical solution) it is described in further detail.Obviously, described embodiment is only a part of the embodiments of the present invention, and
The embodiment being not all of.Based on the embodiment of the present invention, those of ordinary skill in the art are not before making creative work
Every other embodiment obtained is put, shall fall within the protection scope of the present invention.
Embodiment one
The heavy die block mould steel process for quenching that the present invention designs, steps are as follows:
1. workpiece is heated to 870 DEG C ± 10 DEG C, 8 hours are kept the temperature；
2. first time enters water water cooling 42 minutes, 500 DEG C of center portion temperature are controlled, air-cooled 3 minutes, is risen again 350 DEG C；
3. second enters water water cooling 15 minutes, 400 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 300 DEG C；
4. third time enters water water cooling 10 minutes, 300 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 260 DEG C；
5. the 4th time enters water water cooling 8 minutes, 250 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 230 DEG C；
Embodiment two
The heavy die block mould steel process for quenching that the present invention designs, steps are as follows:
1. workpiece is heated to 870 DEG C ± 10 DEG C, 8.5 hours are kept the temperature；
2. first time enters water water cooling 46 minutes, 500 DEG C of center portion temperature are controlled, air-cooled 3 minutes, is risen again 350 DEG C；
3. second enters water water cooling 12 minutes, 400 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 300 DEG C；
4. third time enters water water cooling 12 minutes, 300 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 260 DEG C；
5. the 4th time enters water water cooling 10 minutes, 250 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 230 DEG C；
Embodiment three
The heavy die block mould steel process for quenching that the present invention designs, steps are as follows:
1. workpiece is heated to 870 DEG C ± 10 DEG C, 9 hours are kept the temperature；
2. first time enters water water cooling 48 minutes, 500 DEG C of center portion temperature are controlled, air-cooled 3 minutes, is risen again 350 DEG C；
3. second enters water water cooling 13 minutes, 400 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 300 DEG C；
4. third time enters water water cooling 11 minutes, 300 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 260 DEG C；
5. the 4th time enters water water cooling 9 minutes, 250 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 230 DEG C；
Preferably, tempering temperature is the surface temperature of heavy die block mold to be processed.
Preferably, water cooling uses and heavy die block mold to be processed is completely immersed in water, and controlling water velocity is 45
~50L/min.
It should be readily apparent to one skilled in the art that the above is merely preferred embodiments of the present invention, not to limit this hair
Bright, all any modification, combination, replacement, improvement etc. made under the spirit and principles in the present invention are all contained in guarantor of the invention
Within the scope of shield.
Claims (7)
1. a kind of heavy die block mould steel process for quenching, it is characterised in that: heavy die block mould steel to be processed is heated to Austria
Family name's temperature section simultaneously keeps the temperature 8~9 hours；Water cooling simultaneously controls center portion temperature, and it is air-cooled to hang out heavy die block mould steel to be processed
Self tempering；Repeatedly water cooling, it is four times air-cooled after so that the center portion temperature of heavy die block mold to be processed reach martensite start turn
Temperature completes quenching.
2. heavy die block mould steel process for quenching according to claim 1, it is characterised in that: enter for the first time water water cooling 42~
48 minutes, 500 DEG C of center portion temperature are controlled, air-cooled 3 minutes, is risen again 350 DEG C.
3. heavy die block mould steel process for quenching according to claim 1, it is characterised in that: enter for the second time water water cooling 12~
15 minutes, 400 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 300 DEG C.
4. heavy die block mould steel process for quenching according to claim 1, it is characterised in that: enter for the third time water water cooling 10~
12 minutes, 300 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 260 DEG C.
5. heavy die block mould steel process for quenching according to claim 1, it is characterised in that: enter for the 4th time water water cooling 7~
10 minutes, 250 DEG C of center portion temperature are controlled, air-cooled 2 minutes, is risen again 230 DEG C.
6. according to the heavy die block mould steel process for quenching any in claim 2~5, it is characterised in that: tempering temperature
For the surface temperature of heavy die block mold to be processed.
7. heavy die block mould steel process for quenching according to claims 1 to 5, it is characterised in that: water cooling uses will be wait locate
The heavy die block mold of reason is completely immersed in water, and controlling water velocity is 45~50L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811053850.2A CN109161644A (en) | 2018-09-11 | 2018-09-11 | A kind of heavy die block mould steel process for quenching |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811053850.2A CN109161644A (en) | 2018-09-11 | 2018-09-11 | A kind of heavy die block mould steel process for quenching |
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| CN109161644A true CN109161644A (en) | 2019-01-08 |
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| CN201811053850.2A Pending CN109161644A (en) | 2018-09-11 | 2018-09-11 | A kind of heavy die block mould steel process for quenching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779382A (en) * | 2019-11-08 | 2021-05-11 | 佛山顶锋日嘉模具有限公司 | Heat treatment method for hot work die steel |
Citations (5)
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|---|---|---|---|---|
| CN101363070A (en) * | 2007-08-07 | 2009-02-11 | 上海重型机器厂有限公司 | Water quenching and air cooling modified treatment technology of 42CrMo material |
| CN106929656A (en) * | 2017-03-01 | 2017-07-07 | 上海电气上重铸锻有限公司 | A kind of hardening and tempering method of 34CrNiMo6 large forgings |
| CN107699800A (en) * | 2017-08-30 | 2018-02-16 | 唐山志威科技有限公司 | A kind of core rod ZW633 Used for Large-sized Plastics containing Nb and preparation method thereof |
| CN107699801A (en) * | 2017-09-04 | 2018-02-16 | 唐山志威科技有限公司 | A kind of core rod ZW616 of plastic die steel containing V and preparation method thereof |
| CN107937672A (en) * | 2017-12-18 | 2018-04-20 | 南阳汉冶特钢有限公司 | The process for quenching that a kind of special thick structural alloy steel different medium is alternately cooled |
-
2018
- 2018-09-11 CN CN201811053850.2A patent/CN109161644A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101363070A (en) * | 2007-08-07 | 2009-02-11 | 上海重型机器厂有限公司 | Water quenching and air cooling modified treatment technology of 42CrMo material |
| CN106929656A (en) * | 2017-03-01 | 2017-07-07 | 上海电气上重铸锻有限公司 | A kind of hardening and tempering method of 34CrNiMo6 large forgings |
| CN107699800A (en) * | 2017-08-30 | 2018-02-16 | 唐山志威科技有限公司 | A kind of core rod ZW633 Used for Large-sized Plastics containing Nb and preparation method thereof |
| CN107699801A (en) * | 2017-09-04 | 2018-02-16 | 唐山志威科技有限公司 | A kind of core rod ZW616 of plastic die steel containing V and preparation method thereof |
| CN107937672A (en) * | 2017-12-18 | 2018-04-20 | 南阳汉冶特钢有限公司 | The process for quenching that a kind of special thick structural alloy steel different medium is alternately cooled |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779382A (en) * | 2019-11-08 | 2021-05-11 | 佛山顶锋日嘉模具有限公司 | Heat treatment method for hot work die steel |
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Application publication date: 20190108 |