CN116411160A - Large forging semisteel vertical roll heat treatment cooling method - Google Patents
Large forging semisteel vertical roll heat treatment cooling method Download PDFInfo
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- CN116411160A CN116411160A CN202111667718.2A CN202111667718A CN116411160A CN 116411160 A CN116411160 A CN 116411160A CN 202111667718 A CN202111667718 A CN 202111667718A CN 116411160 A CN116411160 A CN 116411160A
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- cooling
- semisteel
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- vertical roller
- temperature
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- 238000001816 cooling Methods 0.000 title claims abstract description 76
- 238000010438 heat treatment Methods 0.000 title claims abstract description 14
- 238000005242 forging Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 239000007921 spray Substances 0.000 claims description 25
- 230000007704 transition Effects 0.000 claims description 11
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000005496 tempering Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000007600 charging Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 6
- 238000010080 roll forging Methods 0.000 abstract description 3
- 230000006032 tissue transformation Effects 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
-
- 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
- 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
- C21D1/62—Quenching devices
-
- 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
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A heat treatment cooling method for a large-scale forging semisteel vertical roll comprises the following steps: step one: a rapid cooling stage; step two: a stationary cooling stage; step three: a core diathermy stage; step four: and (3) a temperature homogenizing stage. The device adopted by the invention has the advantages of simple structure, low cost, simple and convenient operation and wide application range, can provide cooling speeds with different sizes from air cooling to fog cooling, is convenient to adjust and flexibly convert each cooling speed, meets the requirements of different products and different cooling speeds, is flexible and mobile in movement, and has small requirements on space of a field. The cooling equipment is used, and the cooling process is matched, so that the cooling intensity can be effectively controlled when the large-scale forged semisteel vertical roll forging is produced, the target tissue transformation is realized, and the semisteel vertical roll has excellent mechanical property and service performance.
Description
Technical Field
The invention belongs to the field of heat treatment and cooling of large-scale forging semisteel vertical rolls, and particularly relates to a heat treatment and cooling method of a large-scale forging semisteel vertical roll.
Background
The vertical roller is a main working part of the universal rolling mill, has high manufacturing cost and high consumption, and has important influence on the production, use and maintenance cost of rolling mill equipment. When the vertical roller works, the vertical roller bears huge stress, and the material of the vertical roller is required to have high toughness and metallurgical quality with excellent comprehensive performance. The alloy semisteel vertical roll is made of high-carbon composite semisteel, has mechanical properties between steel and iron, has the strength and toughness of a steel roll and the high hardness of an iron roll, has the unique properties of small hardness drop, high wear resistance and the like, and can bear the requirements of rolling load and rolling quality.
The carbon content of the semisteel is between that of steel and iron, a large amount of carbide is contained in the structure to ensure the high hardness and thermal state wear resistance of the semisteel, and the matrix structure has a larger influence on the toughness and impact resistance of the material. In order to refine and strengthen the matrix structure, increase the vertical crack resistance, accident resistance and the like, the heat treatment process of the semisteel vertical roll, particularly the cooling mode, needs to be strictly controlled. Because of high carbon content, the quenching cracking tendency is larger, and the quenching is difficult to bear overstress. And a slower cooling mode is adopted, net carbide is easy to appear in the tissue, the strength and the toughness of the vertical roller are greatly damaged, and the breakage resistance of the vertical roller is reduced. Therefore, conventional liquid medium quenching or air cooling cannot meet the performance requirements of the vertical rolls.
Disclosure of Invention
The invention provides a heat treatment cooling method for a large forged semisteel vertical roll, which is used for solving the defects in the prior art.
The invention is realized by the following technical scheme:
a heat treatment cooling method for a large-scale forging semisteel vertical roll comprises the following steps:
step one: and (3) a rapid cooling stage: in the initial stage of cooling, a fan is turned on, the water inflow is regulated to the maximum, rapid spray cooling is carried out, the surface temperature of the vertical roller is rapidly reduced, the precipitation of netlike carbide is avoided, and the temperature of the vertical roller is reduced to 500-550 ℃;
step two: and (3) a stable cooling stage: regulating water inflow at a constant speed, reducing spray intensity, reducing the cooling speed of the vertical roller, further reducing the secondary surface temperature of the vertical roller, increasing the depth of a quenching layer, and reducing the temperature of the vertical roller to 400-450 ℃;
step three: core diathermy stage: after the water inlet pipe is closed, continuing to perform blowing cooling to enable heat in the vertical roller to be conducted outwards, enabling the core structure to be transformed, and reducing the temperature of the vertical roller to 350-380 ℃;
step four: a temperature homogenizing stage; and (3) after the fan is closed, air cooling is carried out, so that the surface and core temperature of the vertical roller are homogenized, the internal and external temperature difference is reduced, the stress is reduced, the temperature of the vertical roller is reduced to 300-330 ℃, cooling is finished, and furnace charging is carried out for tempering.
The cooling device comprises a water pump, a water inlet pipe, a fan, a transition pipe, a spray pipe, a support and rollers, wherein the water pump is communicated with one end of the transition pipe through the water inlet pipe, the other end of the transition pipe is communicated with the spray pipe, the spray pipe is arranged on the front side of a blade of the fan, the inner side of the spray pipe is provided with a plurality of water spray holes, the fan is arranged on the support, and the four corners of the lower part of the support are respectively provided with one roller.
The heat treatment cooling method for the large forged semisteel vertical roll is characterized by comprising the following steps of: the diameter of the water spraying hole is 2-5mm.
The invention has the advantages that: the device adopted by the invention has the advantages of simple structure, low cost, simple and convenient operation and wide application range, can provide cooling speeds with different sizes from air cooling to fog cooling, is convenient to adjust and flexibly convert each cooling speed, meets the requirements of different products and different cooling speeds, is flexible and mobile in movement, and has small requirements on space of a field. The cooling equipment is used, and the cooling process is matched, so that the cooling intensity can be effectively controlled when the large-scale forged semisteel vertical roll forging is produced, the target tissue transformation is realized, and the semisteel vertical roll has excellent mechanical property and service performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic view of a cooling apparatus of the present invention;
FIG. 2 is a schematic view of the water jet pipe structure of the cooling device of the present invention.
Reference numerals: 1. a water pump; 2. a water inlet pipe; 3. a blower; 4. a transition pipe; 5. a water spray pipe; 6. a bracket; 7. a roller; 8. and water spraying holes.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the cooling device comprises a water pump 1, a water inlet pipe 2, a fan 3, a transition pipe 4, a spray pipe 5, a support 6 and rollers 7, wherein the water pump 1 is communicated with one end of the transition pipe 4 through the water inlet pipe 2, the other end of the transition pipe 4 is communicated with the spray pipe 5, the spray pipe 5 is arranged on the front side of a blade of the fan 3, the inner side of the spray pipe 5 is provided with a plurality of water spray holes 8, the fan 3 is arranged on the support 6, and the four corners of the lower part of the support 6 are respectively provided with a roller 7. When the spray nozzle is used, the water pump 1 is turned on, water flows through the water inlet pipe 2 and the transition pipe 4 to enter the spray pipe 5, and is sprayed out through the water spraying holes 8 at the inner side of the spray pipe 5, fine water columns are formed by spraying to the center, the fan 3 is turned on, and the water columns are scattered into mist by strong air flow generated by the blades, so that the forgings placed in front of the fan can be blown to mist and cooled.
The water spraying pipe 5 in the embodiment is a rubber pipe or a steel pipe, which is rolled into a circle shape, and a plurality of water spraying holes 8 with diameters of 2-5mm are uniformly distributed on the wall of the circular inner side pipe.
The cooling equipment is adopted for carrying out heat treatment cooling on the large semisteel vertical roll, and the specific process steps are as follows:
after the vertical rolls are fully austenitized, the vertical rolls are lifted out of the heating furnace by using the lifting tool, the vertical rolls are moved to the front of the fan, the fan and the water inlet pipe are opened, the vertical rolls are cooled, and the lifting tool drives the vertical rolls to rotate at a constant speed in the cooling process, so that different positions of the vertical rolls are cooled uniformly. The quenching cooling process is mainly completed in four stages, namely a rapid cooling stage, a stable cooling stage, a core diathermanous stage and a temperature homogenizing stage. And after cooling, charging and tempering.
Wherein the four stages specifically operate as follows:
step one: in the rapid cooling stage, in the initial cooling stage, a fan is turned on, the water inflow is regulated to the maximum, and rapid spray cooling is carried out, so that the surface temperature of the vertical roller is rapidly reduced, the precipitation of netlike carbide is avoided, and the temperature of the vertical roller is 500-550 ℃;
step two: in the stable cooling stage, the water inflow is regulated down at a constant speed, the spray intensity is reduced, the cooling speed of the vertical roller is reduced, the secondary surface temperature of the vertical roller is further reduced, the depth of the quenching layer is increased, and the water inlet pipe is closed until the temperature of the vertical roller is 400-450 ℃;
step three: the central part diathermy stage, after closing the water inlet pipe, continuing to perform blowing cooling to enable the heat in the vertical roller to be conducted outwards, enabling the central part structure to be transformed, and closing the fan until the temperature of the vertical roller is 350-380 ℃;
step four: and in the temperature homogenizing stage, the air cooling is carried out after the fan is closed, so that the surface temperature and the core temperature of the vertical roller are homogenized, the internal and external temperature difference is reduced, the stress is reduced, the surface temperature of the vertical roller is 300-330 ℃, the cooling is finished, and the furnace is filled for tempering.
The device adopted by the invention has the advantages of simple structure, low cost, simple and convenient operation and wide application range, can provide cooling speeds with different sizes from air cooling to fog cooling, is convenient to adjust and flexibly convert each cooling speed, meets the requirements of different products and different cooling speeds, is flexible and mobile in movement, and has small requirements on space of a field. The cooling equipment is used, and the cooling process is matched, so that the cooling intensity can be effectively controlled when the large-scale forged semisteel vertical roll forging is produced, the target tissue transformation is realized, and the semisteel vertical roll has excellent mechanical property and service performance. Therefore, the invention has high industrial utilization value.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A heat treatment cooling method for a large-scale forging semisteel vertical roll is characterized by comprising the following steps of: the method comprises the following steps:
step one: and (3) a rapid cooling stage: in the initial stage of cooling, a fan is turned on, the water inflow is regulated to the maximum, rapid spray cooling is carried out, the surface temperature of the vertical roller is rapidly reduced, the precipitation of netlike carbide is avoided, and the temperature of the vertical roller is reduced to 500-550 ℃;
step two: and (3) a stable cooling stage: regulating water inflow at a constant speed, reducing spray intensity, reducing the cooling speed of the vertical roller, further reducing the secondary surface temperature of the vertical roller, increasing the depth of a quenching layer, and reducing the temperature of the vertical roller to 400-450 ℃;
step three: core diathermy stage: after the water inlet pipe is closed, continuing to perform blowing cooling to enable heat in the vertical roller to be conducted outwards, enabling the core structure to be transformed, and reducing the temperature of the vertical roller to 350-380 ℃;
step four: a temperature homogenizing stage; and (3) after the fan is closed, air cooling is carried out, so that the surface and core temperature of the vertical roller are homogenized, the internal and external temperature difference is reduced, the stress is reduced, the temperature of the vertical roller is reduced to 300-330 ℃, cooling is finished, and furnace charging is carried out for tempering.
2. The method for cooling the large forged semisteel vertical roll by heat treatment according to claim 1, which is characterized in that: the cooling device comprises a water pump, a water inlet pipe, a fan, a transition pipe, a spray pipe, a support and rollers, wherein the water pump is communicated with one end of the transition pipe through the water inlet pipe, the other end of the transition pipe is communicated with the spray pipe, the spray pipe is arranged on the front side of a blade of the fan, the inner side of the spray pipe is provided with a plurality of spray holes, the fan is arranged on the support, and the four corners of the lower portion of the support are respectively provided with one roller.
3. The method for cooling the large forged semisteel vertical roll by heat treatment according to claim 2, which is characterized in that: the diameter of the water spraying hole is 2-5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111667718.2A CN116411160A (en) | 2021-12-30 | 2021-12-30 | Large forging semisteel vertical roll heat treatment cooling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111667718.2A CN116411160A (en) | 2021-12-30 | 2021-12-30 | Large forging semisteel vertical roll heat treatment cooling method |
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| Publication Number | Publication Date |
|---|---|
| CN116411160A true CN116411160A (en) | 2023-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111667718.2A Pending CN116411160A (en) | 2021-12-30 | 2021-12-30 | Large forging semisteel vertical roll heat treatment cooling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117701864A (en) * | 2024-02-05 | 2024-03-15 | 山西天宝集团有限公司 | Rotary spraying cooling device and method for heat treatment annular forging |
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2021
- 2021-12-30 CN CN202111667718.2A patent/CN116411160A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117701864A (en) * | 2024-02-05 | 2024-03-15 | 山西天宝集团有限公司 | Rotary spraying cooling device and method for heat treatment annular forging |
| CN117701864B (en) * | 2024-02-05 | 2024-04-19 | 山西天宝集团有限公司 | Rotary spraying cooling device and method for heat treatment annular forging |
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