CN117070735A - Large roller heat treatment process for offshore wind power generation and engineering machinery - Google Patents
Large roller heat treatment process for offshore wind power generation and engineering machinery Download PDFInfo
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- CN117070735A CN117070735A CN202311322014.0A CN202311322014A CN117070735A CN 117070735 A CN117070735 A CN 117070735A CN 202311322014 A CN202311322014 A CN 202311322014A CN 117070735 A CN117070735 A CN 117070735A
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- Prior art keywords
- roller
- equal
- heat treatment
- temperature
- treatment process
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Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010248 power generation Methods 0.000 title claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 15
- 238000005496 tempering Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005261 decarburization Methods 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims abstract description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001294 propane Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 7
- 229910000734 martensite Inorganic materials 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract 1
- 238000004321 preservation Methods 0.000 description 2
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a large-scale roller heat treatment process for offshore wind power generation and engineering machinery, which comprises the following steps of firstly, cleaning a roller; step two, conveying the cleaned roller into a preheating furnace; step three, the preheated roller enters an austenitizing furnace; step four, cooling the roller after austenitizing; step five, the cooled roller passes through an air cooling table of four stations; step six, performing secondary cooling by using the air-cooled roller; step seven, washing and spraying water by a roller after secondary cooling; and step eight, roller tempering. The advantages that for the roller with the diameter of more than 80mm, the material is 100CrMo7-3, the difference between the surface hardness and the core hardness is less than or equal to 2HRC, the core hardness is more than or equal to HRC57, the surface hardness is more than or equal to HRC59, and the residual austenite is less than or equal to 3%; the non-working surface does not allow decarburization; the internal oxidation and austenite grain size reaches more than or equal to 9 grades, and the martensitic structure has no microscopic cracks; meets the quality requirements of the SKF, the Rothe Erde, the IMO and the NKE foreign famous bearing companies on the high-end roller.
Description
Technical Field
The invention relates to the field of bearing roller processing, in particular to a large roller heat treatment process for offshore wind power generation and engineering machinery.
Background
The heat treatment process of the large roller (with the diameter larger than 60 mm) for offshore wind power generation and mechanical engineering comprises roller cleaning, rinsing, preheating, austenitizing (heating, temperature equalizing, heat preservation), nitrate cooling, air cooling, cold cleaning, post cleaning, water spraying and tempering. Difficulty in control: proper selection of austenitizing temperature, how to avoid roller decarburization risk by long-time heat preservation at high temperature, how to control nitrate water content, how to ensure core hardness, how to reduce the temperature to below 70 ℃ after air cooling of a large roller, and how to avoid microscopic cracks of a martensitic structure by secondary cooling.
Mainly, the difference between the surface of the roller > HRC58 and the core hardness > HRC56 is less than or equal to 2HRC. The residual austenite is less than 3%, the working surface does not allow decarburization, and the present requirement for intergranular oxidation is also met. In addition to the austenite grain size. The length of the martensitic needle leaf is definitely required; the heat treatment difficulties are: the hardness difference between the surface and the core is controlled (2 HRC or less), the retained austenite is controlled (2% or less), and the decarburization is specifically required (decarburization is not allowed on the non-working surface). In addition, there are special requirements (grade 9 or more) for internal oxidation and austenite grain size, and special requirements for the time required for quenching to tempering of the large roller for this special purpose, and for heat treatment stability and consistency.
Disclosure of Invention
In order to solve the technical problems, the invention provides a heat treatment process of a large roller for offshore wind power generation and engineering machinery, which is perfect and meets the quality requirements of customers on high-end rollers.
The technical scheme of the invention is as follows:
a large-scale roller heat treatment process for offshore wind power generation and engineering machinery,
step one, cleaning a 100CrMo7-3 roller with the diameter of more than 60mm to remove dirt on the surface of the roller;
step two, conveying the cleaned roller into a preheating furnace, wherein the temperature is 300-20 ℃; the water on the surface of the cleaned roller is removed fully, and meanwhile, the tensile stress during roller turning is removed; the temperature fluctuation caused when the roller enters the austenitizing furnace is avoided;
step three, the preheated roller enters an austenitizing furnace, a protective atmosphere of nitrogen, methanol and propane is used, and the carbon potential of the austenitizing furnace is precisely controlled through an oxygen probe and a carbon potential controller, so that decarburization of the working surface and the non-working surface of the roller is avoided;
step four, the austenitized roller enters a nitrate tank at 160-170 ℃ for cooling, and the cooling time of the roller is controlled to be 25 minutes, so that the surface temperature of the roller is ensured to be consistent with the core temperature, and the occurrence of roller temperature return is avoided;
step five, the cooled roller passes through an air cooling table of four stations (the air cooling time is more than or equal to 24 minutes), and the temperature of the surface of the roller and the temperature of the core part are reduced to 65 ℃ before secondary cooling;
step six, the air-cooled roller enters secondary cooling, the secondary cooling temperature is controlled at 5-10 ℃, and the purposes of reducing residual austenite and stabilizing the size of the roller are achieved;
step seven, cleaning and spraying water after entering the secondarily cooled roller, so as to fully remove residual salt on the surface of the roller and in a big roller top pinhole, and avoid corrosion to heating elements of the tempering furnace;
and step eight, the roller which is cleaned and sprayed with water after the step is put into a tempering furnace for tempering.
The difference of the surface hardness and the core hardness of the roller treated by the heat treatment process is less than or equal to 2HRC, the core hardness is more than or equal to HRC57, the surface hardness is more than or equal to HRC59, and the residual austenite is less than or equal to 3%.
The heat treatment process is aimed at rollers with the diameter of more than 80 mm.
The invention has the advantages that the material is 100CrMo7-3 material aiming at the roller heat treatment process with the diameter of more than 80mm, after the heat treatment process is adopted, the difference between the surface hardness and the core hardness is less than or equal to 2HRC, the core hardness is more than or equal to HRC57, the surface hardness is more than or equal to HRC59, and the residual austenite is less than or equal to 3%; the non-working surface does not allow decarburization; the internal oxidation and austenite grain size reaches more than or equal to 9 grades, and the martensitic structure has no microscopic cracks; meets the quality requirements of the SKF, the Rothe Erde, the IMO and the NKE foreign famous bearing companies on the high-end roller.
Detailed Description
A large-scale roller heat treatment process for offshore wind power generation and engineering machinery aims at the roller heat treatment process with the diameter of more than 80 mm; the material is 100CrMo7-3 material, after the heat treatment process is adopted, the difference between the surface hardness and the core hardness is less than or equal to 2HRC, the core hardness is more than or equal to HRC57, the surface hardness is more than or equal to HRC59, and the residual austenite is less than or equal to 3%; can meet the quality requirements of the foreign famous bearing companies of SKF, rothe Erde, IMO and NKE on the high-end roller.
The heat treatment process comprises roller cleaning, rinsing, preheating, austenitizing (heating, temperature equalizing, heat preserving), nitrate cooling, air cooling, cold cleaning, post cleaning, water spraying and tempering.
A large-scale roller heat treatment process for offshore wind power generation and engineering machinery,
1. cleaning a 100CrMo7-3 roller with the diameter of more than 80mm to remove dirt on the surface of the roller;
2. the cleaned roller is sent into a preheating furnace, and the temperature is 300-20 ℃. The function is to fully remove the roller after cleaning
The surface moisture can also achieve the aim of removing the tensile stress during the turning of the roller. The temperature fluctuation caused when the roller enters the austenitizing furnace can be avoided;
3. the preheated roller enters an austenitizing furnace, and the carbon potential of the austenitizing furnace can be precisely controlled by using a protective atmosphere of nitrogen, methanol and propane through an oxygen probe and a carbon potential controller, so that decarburization of the working surface and the non-working surface of the roller is avoided;
4. the austenitized roller enters a nitrate tank at 160-170 ℃ for cooling, and the cooling time of the roller is controlled to be 25 minutes, so that the surface temperature of the roller is ensured to be consistent with the core temperature, and the occurrence of roller temperature return is avoided;
5. the cooled roller passes through an air cooling table with four stations (the air cooling time is more than or equal to 24 minutes), and the temperature of the surface of the roller and the temperature of the core part are reduced to 65 ℃ before the roller enters secondary cooling;
6. the air-cooled roller enters secondary cooling, the secondary cooling temperature is controlled at 5-10 ℃, and the purposes of reducing residual austenite and stabilizing the size of the roller are achieved;
7. cleaning and spraying water after entering the secondarily cooled roller, and fully removing residual salt on the surface of the roller and in a big roller top pinhole, so that corrosion to heating components of a tempering furnace is avoided;
8. the roller after being cleaned and sprayed with water enters a tempering furnace for tempering.
For the roller heat treatment process with the diameter of more than 80mm, the material is 100CrMo7-3 material, after the heat treatment process is adopted, the difference between the surface hardness and the core hardness is less than or equal to 2HRC, the core hardness is more than or equal to HRC57, the surface hardness is more than or equal to HRC59, and the residual austenite is less than or equal to 3%; the non-working surface does not allow decarburization; the internal oxidation and austenite grain size reaches more than or equal to 9 grades, and the martensitic structure has no microscopic cracks; meets the quality requirements of the SKF, the Rothe Erde, the IMO and the NKE foreign famous bearing companies on the high-end roller.
Claims (3)
1. A heat treatment process for large rollers for offshore wind power generation and engineering machinery is characterized in that,
step one, cleaning a 100CrMo7-3 roller with the diameter of more than 60mm to remove dirt on the surface of the roller;
step two, conveying the cleaned roller into a preheating furnace, wherein the temperature is 300-20 ℃; the water on the surface of the cleaned roller is removed fully, and meanwhile, the tensile stress during roller turning is removed; the temperature fluctuation caused when the roller enters the austenitizing furnace is avoided;
step three, the preheated roller enters an austenitizing furnace, a protective atmosphere of nitrogen, methanol and propane is used, and the carbon potential of the austenitizing furnace is precisely controlled through an oxygen probe and a carbon potential controller, so that decarburization of the working surface and the non-working surface of the roller is avoided;
step four, the austenitized roller enters a nitrate tank at 160-170 ℃ for cooling, and the cooling time of the roller is controlled to be 25 minutes, so that the surface temperature of the roller is ensured to be consistent with the core temperature, and the occurrence of roller temperature return is avoided;
step five, the cooled roller passes through an air cooling table with four stations, the air cooling time is 24 minutes, and the temperature of the surface of the roller and the temperature of the core part are reduced to 65 ℃ before the roller enters secondary cooling;
step six, the air-cooled roller enters secondary cooling, the secondary cooling temperature is controlled at 5-10 ℃, and the purposes of reducing residual austenite and stabilizing the size of the roller are achieved;
step seven, cleaning and spraying water after entering the secondarily cooled roller, so as to fully remove residual salt on the surface of the roller and in a big roller top pinhole, and avoid corrosion to heating elements of the tempering furnace;
and step eight, the roller subjected to post-cleaning and water spraying enters a tempering furnace for tempering and air cooling.
2. The heat treatment process of the large roller for offshore wind power generation and engineering machinery according to claim 1, wherein the difference between the surface hardness and the core hardness of the roller treated by the heat treatment process is less than or equal to 2HRC, the core hardness is more than or equal to HRC57, the surface hardness is more than or equal to HRC59 and the residual austenite is less than or equal to 3%.
3. The heat treatment process for large-scale rollers for offshore wind power generation and engineering machinery according to claim 1, wherein the heat treatment process is aimed at rollers with the diameter of more than 80 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311322014.0A CN117070735A (en) | 2023-10-13 | 2023-10-13 | Large roller heat treatment process for offshore wind power generation and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311322014.0A CN117070735A (en) | 2023-10-13 | 2023-10-13 | Large roller heat treatment process for offshore wind power generation and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117070735A true CN117070735A (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311322014.0A Pending CN117070735A (en) | 2023-10-13 | 2023-10-13 | Large roller heat treatment process for offshore wind power generation and engineering machinery |
Country Status (1)
| Country | Link |
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| CN (1) | CN117070735A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758073A (en) * | 2012-07-18 | 2012-10-31 | 浙江天马轴承股份有限公司 | Heat treatment method of bearing |
| CN103710509A (en) * | 2014-01-08 | 2014-04-09 | 江苏力星通用钢球股份有限公司 | Manufacturing method of precise tapered roller specially for high speed train unit |
| CN105936972A (en) * | 2016-06-24 | 2016-09-14 | 中航工业哈尔滨轴承有限公司 | Heat treatment technique for special-purpose bearing part made of high-carbon-chromium bearing steel |
| CN108504825A (en) * | 2018-05-24 | 2018-09-07 | 洛阳市洛凌轴承科技股份有限公司 | A kind of heat treatment process of the extremely low retained austenite of high-carbon chromium bearing ring |
| CN108588392A (en) * | 2018-05-14 | 2018-09-28 | 洛阳Lyc轴承有限公司 | A kind of method after oversize self-aligning bearing ring salt bath quenching |
| CN109338047A (en) * | 2018-11-18 | 2019-02-15 | 柳州中通科技有限公司 | One rail traffic high-precision bearing roller heat treatment process |
| CN112760460A (en) * | 2020-12-31 | 2021-05-07 | 山东泰扬精密轴承制造有限公司 | Quenching and cooling method for large-scale self-aligning roller bearing ring |
| CN115537540A (en) * | 2022-09-05 | 2022-12-30 | 扬州市久盈精密主轴有限公司 | Heat treatment method for small conical bearing |
| CN115717232A (en) * | 2022-11-16 | 2023-02-28 | 山东金帝精密机械科技股份有限公司 | Heat treatment method of bearing retainer |
-
2023
- 2023-10-13 CN CN202311322014.0A patent/CN117070735A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758073A (en) * | 2012-07-18 | 2012-10-31 | 浙江天马轴承股份有限公司 | Heat treatment method of bearing |
| CN103710509A (en) * | 2014-01-08 | 2014-04-09 | 江苏力星通用钢球股份有限公司 | Manufacturing method of precise tapered roller specially for high speed train unit |
| CN105936972A (en) * | 2016-06-24 | 2016-09-14 | 中航工业哈尔滨轴承有限公司 | Heat treatment technique for special-purpose bearing part made of high-carbon-chromium bearing steel |
| CN108588392A (en) * | 2018-05-14 | 2018-09-28 | 洛阳Lyc轴承有限公司 | A kind of method after oversize self-aligning bearing ring salt bath quenching |
| CN108504825A (en) * | 2018-05-24 | 2018-09-07 | 洛阳市洛凌轴承科技股份有限公司 | A kind of heat treatment process of the extremely low retained austenite of high-carbon chromium bearing ring |
| CN109338047A (en) * | 2018-11-18 | 2019-02-15 | 柳州中通科技有限公司 | One rail traffic high-precision bearing roller heat treatment process |
| CN112760460A (en) * | 2020-12-31 | 2021-05-07 | 山东泰扬精密轴承制造有限公司 | Quenching and cooling method for large-scale self-aligning roller bearing ring |
| CN115537540A (en) * | 2022-09-05 | 2022-12-30 | 扬州市久盈精密主轴有限公司 | Heat treatment method for small conical bearing |
| CN115717232A (en) * | 2022-11-16 | 2023-02-28 | 山东金帝精密机械科技股份有限公司 | Heat treatment method of bearing retainer |
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