CN110684890B - Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method - Google Patents
Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method Download PDFInfo
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- CN110684890B CN110684890B CN201911056525.6A CN201911056525A CN110684890B CN 110684890 B CN110684890 B CN 110684890B CN 201911056525 A CN201911056525 A CN 201911056525A CN 110684890 B CN110684890 B CN 110684890B
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
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- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention discloses a cryogenic treatment method for a forged steel cold roll and a novel nozzle adopted by the cryogenic treatment method, wherein the nozzle is provided with an installation part and a nozzle head, and the nozzle head is provided with 1 large nozzle with the diameter of 0.8-1.2 mm and a plurality of small nozzles with the diameter of 0.4-0.6 mm arranged around the large nozzle; the cryogenic treatment method comprises the following steps: firstly, placing a forged steel cold roll in a cryogenic box, and closing the cryogenic box; secondly, spraying liquid nitrogen into the cryogenic box from a nozzle, and reducing the temperature in the cryogenic box to-160 to-120 ℃ after 1-2 hours; thirdly, preserving heat for 2-5 hours at the temperature; and fourthly, after the heat preservation is finished, opening the cryogenic box, and naturally restoring the forged steel cold roll to the room temperature in the room temperature environment. By designing a novel nozzle and matching with a corresponding cryogenic treatment method, the invention can enable the sprayed liquid nitrogen to be more dispersed and more uniform, thereby enabling the surface hardness of the forged steel cold roll to be more uniform, the hardness of the finished product to be uniform and greatly reducing the blockage phenomenon of the nozzle.
Description
Technical Field
The invention belongs to the technical field of cryogenic treatment, and particularly relates to a cryogenic treatment method for a forged steel cold roll and a novel nozzle adopted by the cryogenic treatment method.
Background
The forged steel cold roll is the most important part of a rolling mill in a cold rolling mill, most of the cold roll manufacturing process is subjected to cryogenic treatment, which is an extension of the cold roll heat treatment cooling process, and the cryogenic treatment is to place the cold roll in a specific low-temperature environment to change the microstructure of the cold roll so as to achieve the purpose of improving the comprehensive performance of the cold roll.
At present, the cryogenic treatment of the forged steel cold roll mainly adopts a liquid nitrogen direct spraying mode, and the cryogenic treatment equipment mainly comprises: the system comprises a liquid nitrogen storage tank, a cryogenic tank, a liquid nitrogen spray pipe and nozzle, an ultralow temperature electromagnetic valve and a control system.
At present, the problems of the direct liquid nitrogen spraying cryogenic treatment mode are as follows: the hardness uniformity of the finished product is poor, and the applicant finds that the problem is greatly related to the existing liquid nitrogen nozzle structure through a large amount of research.
As shown in figures 1-2, the conventional liquid nitrogen nozzle structure comprises a mounting part 1 'and a nozzle head 2', wherein the mounting part 1 'comprises a threaded connection part 11' and a hexagon screw rotating part 12 ', only 1 nozzle 21' with the diameter of about 2mm is arranged on the nozzle head 2 ', and a cavity 3' in the nozzle is only about 4 mm. The liquid nitrogen sprayed out by the nozzle is concentrated, the cooling strength is high, the temperature of the local area of the forged steel cold roll is low, so that a soft belt and even cracks are generated, and the nozzle blockage phenomenon is easy to generate.
Chinese patent document CN103468918A discloses a method for spraying liquid nitrogen into a fine mist by installing a mesh at the nozzle of a liquid nitrogen spray pipe, however, this method does not solve the above problems well.
Disclosure of Invention
The invention aims to solve the problems and provides a cryogenic treatment method for a forged steel cold roll, which can effectively improve the hardness uniformity of a forged steel cold roll finished product, and a novel nozzle adopted by the cryogenic treatment method.
The technical scheme for realizing the purpose of the invention is as follows: a cryogenic treatment method for a forged steel cold roll comprises the following steps: firstly, placing a forged steel cold roll in a cryogenic box, and closing the cryogenic box; secondly, spraying liquid nitrogen into the cryogenic box from a nozzle, and reducing the temperature in the cryogenic box to-160 to-120 ℃ after 1-2 hours; thirdly, preserving heat for 2-5 hours at the temperature of-160 to-120 ℃; and fourthly, after the heat preservation is finished, opening the cryogenic box, and naturally recovering the forged steel cold roll to the room temperature (15-25 ℃ and the same below) in the environment.
The novel nozzle that above-mentioned forged steel cold roll cryogenic treatment method adopted has installation department and nozzle head, the installation department includes threaded connection portion and hex bolts rotating part, it sets up to be equipped with 1 big spout and a plurality of on the nozzle head big spout little spout all around.
The diameter of the large nozzle is 0.8-1.2 mm, and the diameter of the small nozzle is 0.4-0.6 mm.
The cavity inside the nozzle is 5.5-7 mm.
The invention has the following positive effects: by designing a novel nozzle and matching with a corresponding cryogenic treatment method, the sprayed liquid nitrogen can be dispersed and uniform, so that the surface hardness of the forged steel cold roll is uniform, the hardness uniformity of a finished product is greatly improved, and the nozzle blockage phenomenon is also greatly reduced.
Drawings
Fig. 1 is a schematic structural view of a conventional liquid nitrogen nozzle.
Fig. 2 is a right side view of fig. 1.
FIG. 3 is a schematic view of the structure of the liquid nitrogen nozzle of the present invention.
Fig. 4 is a right side view of fig. 3.
FIG. 5 is a graph of the cooling process of the cryogenic treatment of example 1.
Detailed Description
(example 1)
Referring to fig. 3 and 4, the novel nozzle of the present embodiment has a mounting portion 1 and a nozzle head 2, the mounting portion 1 includes a threaded connection portion 11 and a hexagon screw rotating portion 12, a cavity 3 inside the nozzle can reach 6mm, and the nozzle head 2 is provided with 1 large nozzle 21 having a diameter of about 1mm and a plurality of small nozzles 22 having a diameter of about 0.5mm and disposed around the large nozzle 21.
The cryogenic treatment method of the embodiment is as follows:
firstly, a forged steel cold roll is placed in a deep cooling box, and the deep cooling box is closed.
Secondly, controlling an ultralow temperature electromagnetic valve through a control system, spraying liquid nitrogen into the cryogenic box from a liquid nitrogen storage tank through a liquid nitrogen spray pipe and a spray nozzle, and reducing the temperature in the cryogenic box to-140 +/-1 ℃ for 1.5 hours;
and thirdly, preserving heat for 3.5 hours at the temperature of minus 140 +/-1 ℃, and in the heat preservation process, spraying liquid nitrogen to the cryogenic box to ensure that the temperature in the box is unchanged.
And fourthly, after the heat preservation is finished (5 hours in total), opening the cryogenic box, placing the forged steel cold roll in a room temperature environment, and naturally recovering to the room temperature.
The cooling process curve of the cryogenic treatment of the embodiment is shown in figure 5.
Claims (6)
1. A cryogenic treatment method for a forged steel cold roll is characterized by comprising the following steps:
firstly, placing a forged steel cold roll in a cryogenic box, and closing the cryogenic box;
secondly, spraying liquid nitrogen into the cryogenic box from a nozzle, and reducing the temperature in the cryogenic box to-160 to-120 ℃ after 1-2 hours;
thirdly, preserving heat for 2-5 hours at the temperature of-160 to-120 ℃;
fourthly, after the heat preservation is finished, opening the cryogenic box, placing the forged steel cold roll in a room temperature environment, and naturally recovering to the room temperature;
the nozzle is provided with an installation part (1) and a nozzle head (2), the installation part (1) comprises a threaded connection part (11) and a hexagon screw rotating part (12), and the nozzle head (2) is provided with 1 large nozzle (21) and a plurality of small nozzles (22) arranged around the large nozzle (21).
2. The cryogenic treatment method for the cold roll of forged steel according to claim 1, characterized by comprising the following steps: the diameter of the large nozzle (21) is 0.8-1.2 mm, and the diameter of the small nozzle (22) is 0.4-0.6 mm.
3. The cryogenic treatment method for the cold roll of forged steel according to claim 1 or 2, characterized by comprising the following steps: the cavity (3) inside the nozzle is 5.5-7 mm.
4. A novel nozzle adopted by the cryogenic treatment method for the forged steel cold roll according to claim 1, which is provided with an installation part (1) and a nozzle head (2), wherein the installation part (1) comprises a threaded connection part (11) and a hexagon screw rotating part (12), and is characterized in that: the nozzle head (2) is provided with 1 large nozzle (21) and a plurality of small nozzles (22) arranged around the large nozzle (21).
5. The novel nozzle of claim 4, wherein: the diameter of the large nozzle (21) is 0.8-1.2 mm, and the diameter of the small nozzle (22) is 0.4-0.6 mm.
6. The novel nozzle of claim 4 or 5, characterized in that: the cavity (3) inside the nozzle is 5.5-7 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911056525.6A CN110684890B (en) | 2019-10-31 | 2019-10-31 | Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911056525.6A CN110684890B (en) | 2019-10-31 | 2019-10-31 | Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method |
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| Publication Number | Publication Date |
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| CN110684890A CN110684890A (en) | 2020-01-14 |
| CN110684890B true CN110684890B (en) | 2021-08-03 |
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| CN201911056525.6A Active CN110684890B (en) | 2019-10-31 | 2019-10-31 | Cryogenic treatment method for forged steel cold roll and novel nozzle adopted by cryogenic treatment method |
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Families Citing this family (1)
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| CN114350928B (en) * | 2021-12-28 | 2023-04-28 | 宝钢轧辊科技有限责任公司 | Homogenization cryogenic treatment method for roller and cryogenic treatment tank adopted by homogenization cryogenic treatment method |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5553783A (en) * | 1995-01-09 | 1996-09-10 | Bete Fog Nozzle, Inc. | Flat fan spray nozzle |
| JP2917013B1 (en) * | 1998-02-12 | 1999-07-12 | 華光造機株式会社 | Painting gun equipment |
| US20060027679A1 (en) * | 2004-08-03 | 2006-02-09 | Mr. Jack Gratteau | Ejector Nozzle |
| CN201632338U (en) * | 2009-10-15 | 2010-11-17 | 川圆科技股份有限公司 | Water mist nozzle |
| CN201567350U (en) * | 2009-12-07 | 2010-09-01 | 昆明理工大学 | Atomizing gas quenching device |
| US9290823B2 (en) * | 2010-02-23 | 2016-03-22 | Air Products And Chemicals, Inc. | Method of metal processing using cryogenic cooling |
| US9617611B2 (en) * | 2011-03-28 | 2017-04-11 | Ipsen, Inc. | Quenching process and apparatus for practicing said process |
| CN103468918B (en) * | 2013-09-29 | 2015-12-16 | 宝钢轧辊科技有限责任公司 | The deep cooling box of major diameter cold roll cryogenic treating process and employing thereof |
| CN103834780B (en) * | 2014-03-10 | 2016-03-09 | 宜兴市永昌轧辊有限公司 | A kind of horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus |
| CN104032117B (en) * | 2014-05-12 | 2016-09-14 | 宜兴市永昌轧辊有限公司 | A kind of heat treatment method of ultrahigh hardness non-ferrous metal cold roll |
| CN105080740B (en) * | 2014-05-14 | 2017-07-14 | 湖南科伦制药有限公司 | A kind of wash bottle shower nozzle |
| CN104775011B (en) * | 2015-04-28 | 2016-08-24 | 辽宁工业大学 | A kind of axial workpiece fast quenching appts and method |
| GB2554568A (en) * | 2015-06-05 | 2018-04-04 | Halliburton Energy Services Inc | MMC downhole tool region comprising an allotropic material |
| CN105420613B (en) * | 2015-12-02 | 2018-01-05 | 中钢集团邢台机械轧辊有限公司 | Cold roll and its manufacture method with high roughness surface |
| CN107345730B (en) * | 2017-07-21 | 2022-09-20 | 中国科学院理化技术研究所 | Cryogenic treatment device |
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