CN111979380A - Metal die heat treatment processing technology - Google Patents
Metal die heat treatment processing technology Download PDFInfo
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- CN111979380A CN111979380A CN202010792836.5A CN202010792836A CN111979380A CN 111979380 A CN111979380 A CN 111979380A CN 202010792836 A CN202010792836 A CN 202010792836A CN 111979380 A CN111979380 A CN 111979380A
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- Prior art keywords
- die
- tempering
- heat treatment
- heating
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention provides a heat treatment processing technology of a metal die, which comprises the following processing steps of selecting a die blank and naturally drying the die blank; putting the die into a quenching furnace, respectively heating for three times, increasing the heating temperature from low to high, and respectively carrying out heat preservation treatment after heating; then the mould is put into a nitriding furnace for medium temperature gas carbonitriding, and is cooled in the air; then the mould is continuously put into a tempering furnace for tempering; continuously and repeatedly tempering after tempering; finally, polishing; the metal die heat treatment processing technology has good stability and wear resistance, can resist fracture and deformation, improves the strength and hardness of die steel, and can effectively prolong the service life of the die steel; the mode of medium temperature carburization is adopted, the deformation of the die steel is reduced, and the requirement of the alloy tool steel on the market is met.
Description
Technical Field
The invention relates to the technical field of mold heat treatment processing, in particular to a metal mold heat treatment processing technology.
Background
In recent years, with the rapid development of the manufacturing industry in China, the mold industry and mold steel production enterprises have made progress and development, so the mold industry has made higher requirements on the performance of the mold.
When the metal steel material is produced, the metal steel material is subjected to heat treatment, namely, the structure and the performance of the steel are changed by heating and cooling. Steel is an important metal material in economic construction, and is roughly classified into carbon steel and alloy steel, and although carbon steel has good technological properties and is low in price, the properties of carbon steel cannot meet the use requirements due to the development of modern industrial and technological technologies, and thus, people begin to develop various alloy steels with good properties.
The existing alloy steel is used as spare and accessory parts of various machines or as an engineering structure, most of the existing alloy steel has the problems of low hardness and rigidity, short service life and the like caused by deformation, abrasion, fracture or aging easily caused by long-time use, the rejection rate of processed workpieces is influenced, the production cost is increased finally, the use requirement of the market cannot be met, and the economic benefit is influenced. Therefore, a heat treatment process for a metal mold is needed to solve the above drawbacks.
Disclosure of Invention
In order to solve the problems and overcome the defects of the prior art, the invention provides a heat treatment processing technology of a metal die, which has good stability, wear resistance, fracture resistance and deformation resistance, improves the strength and hardness of die steel, and meets the requirement of a large part of dies with strong rigidity.
The invention discloses a heat treatment processing technology of a metal die, which comprises the following processing steps,
s1, selecting a die blank, cleaning the die blank after forging and before machining, and naturally drying the die blank in the air;
s2, placing the die into a quenching furnace, carrying out first heating to 500 ℃ for 300-;
s3, putting the die obtained through quenching treatment in the step S2 into a nitriding furnace for medium-temperature gas carbonitriding at the temperature of 500-;
s4, placing the die obtained in the step S3 into a tempering furnace for tempering, wherein the heating temperature is 450-650 ℃, preserving heat for 2-3h, and then naturally cooling;
s5, repeating the operation of S4 and continuing tempering;
and S6, polishing the die obtained in the step S5 by a polishing machine to obtain a finished product.
Further, the die is made of Cr12MoV die steel or 3Cr2W8V die steel.
Further, in the gas carbonitriding in step S3, the mass ratio of carbon atoms to nitrogen atoms is 3: 2.
The implementation of the heat treatment processing technology for the metal die provided by the invention has the following beneficial technical effects:
the die heat treatment processing technology of the invention mainly comprises three times of quenching and two times of tempering, so that the die steel has good stability, wear resistance, fracture resistance and deformation resistance, the strength and hardness of the die steel are improved, and the service life of the die steel can be effectively prolonged; and the deformation of the die steel is reduced by adopting a medium-temperature carburization mode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention relates to a heat treatment processing technology of a metal die, which comprises the following processing steps,
s1, selecting a die blank, cleaning the die blank after forging and before machining, and naturally drying the die blank in the air;
s2, placing the die into a quenching furnace, carrying out first heating, keeping the temperature for 15 minutes after the first heating is carried out to 300 ℃, then carrying out second heating, keeping the temperature for 20 minutes after the second heating is carried out to 500 ℃, and finally carrying out third heating, keeping the temperature for 20 minutes after the third heating is carried out to 1000 ℃;
s3, putting the die obtained through quenching treatment in the step S2 into a nitriding furnace for medium-temperature gas carbonitriding at 500 ℃ for 5 hours, and then cooling the die to 50 ℃ in air;
s4, putting the die obtained in the step S3 into a tempering furnace for tempering, keeping the temperature for 2 hours at the heating temperature of 450 ℃, and then naturally cooling;
s5, repeating the operation of S4 and continuing tempering;
and S6, polishing the die obtained in the step S5 by a polishing machine to obtain a finished product.
The die is made of Cr12MoV die steel.
In the step S3, in the gas carbonitriding, the mass ratio of carbon atoms to nitrogen atoms is 3: 2.
Example 2
S1, selecting a die blank, cleaning the die blank after forging and before machining, and naturally drying the die blank in the air;
s2, placing the die into a quenching furnace, carrying out first heating, wherein the first heating is carried out to 400 ℃, preserving heat for 18 minutes, then carrying out second heating, the second heating is carried out to 800 ℃, preserving heat for 23 minutes, finally carrying out third heating, the third heating is carried out to 1300 ℃, and preserving heat for 25 minutes;
s3, putting the die obtained through quenching treatment in the step S2 into a nitriding furnace for medium-temperature gas carbonitriding at 550 ℃ for 8 hours, and then cooling the die to 65 ℃ in air;
s4, putting the die obtained in the step S3 into a tempering furnace for tempering, keeping the temperature at 520 ℃ for 2.5 hours, and naturally cooling;
s5, repeating the operation of S4 and continuing tempering;
and S6, polishing the die obtained in the step S5 by a polishing machine to obtain a finished product.
The die is made of Cr12MoV die steel or 3Cr2W8V die steel.
In the step S3, in the gas carbonitriding, the mass ratio of carbon atoms to nitrogen atoms is 3: 2.
Example 3
S1, selecting a die blank, cleaning the die blank after forging and before machining, and naturally drying the die blank in the air;
s2, placing the die into a quenching furnace, carrying out first heating, wherein the first heating is carried out to 500 ℃, preserving heat for 20 minutes, then carrying out second heating, the second heating is carried out to 1000 ℃, preserving heat for 25 minutes, finally carrying out third heating, the third heating is carried out to 1600 ℃, and preserving heat for 30 minutes;
s3, putting the die obtained through quenching treatment in the step S2 into a nitriding furnace for medium-temperature gas carbonitriding at the temperature of 600 ℃ for 10 hours, and then cooling the die to 80 ℃ in air;
s4, putting the die obtained in the step S3 into a tempering furnace for tempering, keeping the temperature for 3 hours at the heating temperature of 650 ℃, and then naturally cooling;
s5, repeating the operation of S4 and continuing tempering;
and S6, polishing the die obtained in the step S5 by a polishing machine to obtain a finished product.
The die is made of Cr12MoV die steel or 3Cr2W8V die steel.
In the step S3, in the gas carbonitriding, the mass ratio of carbon atoms to nitrogen atoms is 3: 2.
The die heat treatment processing technology mainly comprises three times of quenching and two times of tempering, wherein the quenching and tempering times can be determined according to the use requirements of the die, and the quenching and tempering times of the die determine the stability, the wear resistance, the fracture resistance and the deformation resistance of die steel; compared with the traditional die steel processing technology, the die steel has the advantages that the strength and hardness are obviously improved, the service life of the die steel is further prolonged, and the market demand is met; the heat treatment adopts a medium temperature carburization mode, so that the deformation of the die steel is reduced, and the tensile strength and the hardness are enhanced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A heat treatment processing technology for a metal die is characterized by comprising the following steps: comprises the following process steps of the following steps,
s1, selecting a die blank, cleaning the die blank after forging and before machining, and naturally drying the die blank in the air;
s2, placing the die into a quenching furnace, carrying out first heating to 500 ℃ for 300-;
s3, putting the die obtained through quenching treatment in the step S2 into a nitriding furnace for medium-temperature gas carbonitriding at the temperature of 500-;
s4, placing the die obtained in the step S3 into a tempering furnace for tempering, wherein the heating temperature is 450-650 ℃, preserving heat for 2-3h, and then naturally cooling;
s5, repeating the operation of S4 and continuing tempering;
and S6, polishing the die obtained in the step S5 by a polishing machine to obtain a finished product.
2. The heat treatment process for metal molds according to claim 1, wherein the molds are made of Cr12MoV mold steel or 3Cr2W8V mold steel.
3. The heat treatment process for metal molds according to claim 1, wherein in the step S3, the ratio of the mass of carbon atoms to the mass of nitrogen atoms is 3: 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010792836.5A CN111979380A (en) | 2020-08-10 | 2020-08-10 | Metal die heat treatment processing technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010792836.5A CN111979380A (en) | 2020-08-10 | 2020-08-10 | Metal die heat treatment processing technology |
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| CN111979380A true CN111979380A (en) | 2020-11-24 |
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| CN202010792836.5A Pending CN111979380A (en) | 2020-08-10 | 2020-08-10 | Metal die heat treatment processing technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846225A (en) * | 2021-01-07 | 2021-05-28 | 武汉嘉安特精密机械有限公司 | 3D forming process for laser instrument accessories |
| CN113430353A (en) * | 2021-05-21 | 2021-09-24 | 东台升华工具有限公司 | Heat treatment method of high-wind-pressure drilling tool down-the-hole drill bit |
| CN114481011A (en) * | 2021-12-31 | 2022-05-13 | 锦州捷通铁路机械股份有限公司 | Solid nitriding process for surface strengthening of hot die steel with low deformation |
Citations (3)
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| CN103866333A (en) * | 2014-03-05 | 2014-06-18 | 辽宁工业大学 | Nitrocarburizing process of Cr12MoV steel |
| CN108676990A (en) * | 2018-05-18 | 2018-10-19 | 西京学院 | A kind of heat treatment process of 3Cr2W8V molds |
| US20190300976A1 (en) * | 2018-03-28 | 2019-10-03 | Doosan Heavy Industries & Construction Co., Ltd. | Hot-work mold steel for die casting and method of manufacturing the same |
-
2020
- 2020-08-10 CN CN202010792836.5A patent/CN111979380A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866333A (en) * | 2014-03-05 | 2014-06-18 | 辽宁工业大学 | Nitrocarburizing process of Cr12MoV steel |
| US20190300976A1 (en) * | 2018-03-28 | 2019-10-03 | Doosan Heavy Industries & Construction Co., Ltd. | Hot-work mold steel for die casting and method of manufacturing the same |
| CN108676990A (en) * | 2018-05-18 | 2018-10-19 | 西京学院 | A kind of heat treatment process of 3Cr2W8V molds |
Non-Patent Citations (1)
| Title |
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| 易文质主编: "《模具热处理》", 30 April 1981, 湖南科学技术出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846225A (en) * | 2021-01-07 | 2021-05-28 | 武汉嘉安特精密机械有限公司 | 3D forming process for laser instrument accessories |
| CN113430353A (en) * | 2021-05-21 | 2021-09-24 | 东台升华工具有限公司 | Heat treatment method of high-wind-pressure drilling tool down-the-hole drill bit |
| CN113430353B (en) * | 2021-05-21 | 2023-08-22 | 东台升华工具有限公司 | Heat treatment method for high-wind-pressure down-the-hole drill bit of drill tool |
| CN114481011A (en) * | 2021-12-31 | 2022-05-13 | 锦州捷通铁路机械股份有限公司 | Solid nitriding process for surface strengthening of hot die steel with low deformation |
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