CN116814941A - Quenching cooling uniformity control method for intensive hot coil continuous heat treatment - Google Patents
Quenching cooling uniformity control method for intensive hot coil continuous heat treatment Download PDFInfo
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- CN116814941A CN116814941A CN202310800651.8A CN202310800651A CN116814941A CN 116814941 A CN116814941 A CN 116814941A CN 202310800651 A CN202310800651 A CN 202310800651A CN 116814941 A CN116814941 A CN 116814941A
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- 238000010791 quenching Methods 0.000 title claims abstract description 82
- 230000000171 quenching effect Effects 0.000 title claims abstract description 82
- 238000001816 cooling Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 230000006698 induction Effects 0.000 claims abstract description 21
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000005496 tempering Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 43
- 230000008569 process Effects 0.000 claims description 24
- 230000009466 transformation Effects 0.000 claims description 11
- 229910000734 martensite Inorganic materials 0.000 claims description 10
- 238000005336 cracking Methods 0.000 claims description 6
- 229910000510 noble metal Inorganic materials 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 230000004992 fission Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910001562 pearlite Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to the technical field of quenching and cooling, and discloses a quenching and cooling uniformity control method for intensive hot coil continuous heat treatment. According to the quenching cooling uniformity control method for the intensive hot coil continuous heat treatment, the wind power gear is placed in the induction coil, the induction coil is electrified, an induction circuit is gradually generated, when the temperature of the wind power gear is gradually increased, a water pump is started, the surface of the wind power gear is quenched, the quenching depth is generally controlled within 1-2MM, the wind power gear is 54-60HRC hardness, tempering is carried out at 180 ℃, the quenching cooling uniformity can be controlled, the purpose of controlling the surface uniformity of the wind power gear can be achieved, the quality of the wind power gear is improved, the using effect of the wind power gear at the later stage is improved, the wind power gear is quenched in a low-temperature salt bath or an alkali bath furnace, the temperature of the salt bath or the alkali bath is close to an MS point, and the purpose of quenching cooling the wind power gear can be achieved.
Description
Technical Field
The invention relates to the technical field of quenching and cooling, in particular to a quenching and cooling uniformity control method for intensive hot coil continuous heat treatment.
Background
Quenching cooling refers to a technique in which a metal material and a component are heated to a certain temperature and then cooled in a predetermined manner and at a predetermined rate to obtain a desired structure and performance, and includes quenching process and process optimization, quenching medium and performance assessment thereof, quenching device, cooling process and parameter control thereof, cooling process simulation and performance prediction, quenching distortion, cracking and residual stress control. Quenching cooling belongs to the basic process of heat treatment. With the progress of technology, a great deal of research results are obtained in the fields of quenching medium evaluation, quenching and cooling process mechanism research, process simulation, controlled cooling and the like. However, because the quenching and cooling process is very complex, the influence of the flow field and the temperature field which have uneven complex changes of the heat exchange medium, the influence of uneven distribution of metallurgical components of the component, and the like, and the influence of the uneven components of the component increase the difficulty of researching the interaction of three fields (temperature field, tissue field and stress/strain field) which occur in the moment inside the originally very complex component.
At present, in the quenching cooling process of the wind power gear, the uniformity of the wind power gear cannot be well controlled, so that the phenomenon that the wind power gear is uniform in surface is easily caused, the quality of the wind power gear is affected, the later use of the wind power gear is not facilitated, and the defect exists.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a quenching cooling uniformity control method for intensive hot coil continuous heat treatment, which has the advantage of high uniformity and solves the problem of non-uniformity.
(II) technical scheme
In order to achieve the purpose of high uniformity, the invention provides the following technical scheme: a quenching cooling uniformity control method for intensive hot coil continuous heat treatment comprises the following steps:
s1, quenching cooling of wind power gear
The wind power gear is quenched in a low-temperature salt bath or an alkali bath furnace, the temperature of the salt bath or the alkali bath is close to an MS point, the wind power gear is kept at the temperature for 2 to 5 minutes and then is removed for air cooling, the cooling method is called gradient quenching, the internal and external temperatures of the wind power gear are more uniform, and martensitic transformation is carried out simultaneously, so that quenching stress can be greatly reduced, deformation and cracking are prevented, after the internal and external temperatures of the wind power gear are consistent and enter a martensitic region, the grading temperature is preset to be slightly higher than the MS point, and at the moment, the surface of the wind power gear shows different heat transfer properties and quality transformation processes.
S2, quenching cooling uniformity control
The wind power gear is placed in the induction coil, the induction coil is electrified, an induction circuit is gradually generated by the induction coil, when the temperature of the wind power gear is gradually increased, a water pump is started, the power of the water pump is controlled between 550 and 1500 watts, the surface of the wind power gear is quenched, the quenching depth is generally controlled within 1-2MM, the wind power gear is 54-60HRC hardness at the moment, tempering is carried out at 180 ℃, and the quenching and cooling uniformity can be controlled.
S3, quenching cooling uniformity test
The temperature sensor is selected and is a temperature measuring frame, the temperature measuring frame is mainly used for fixing a test thermocouple, the thermocouple is judged by adopting a heat-resistant alloy, a stainless steel tube or other proper shape and size of the temperature measuring frame, the test thermocouple is firmly fixed at the corresponding position of the temperature measuring frame or is placed at the corresponding position in a furnace from a temperature measuring hole, the test thermocouple is led out of the furnace and is directly connected with a test instrument through a compensation lead, the numerical value on the test instrument can be observed at the moment, and the uniformity of quenching and cooling is judged.
Preferably, in the step S1, the wind power gear is first heated to a temperature Ac3 or Ac1 or higher, and then heat is preserved for a period of time.
Preferably, in the step S2, the uniformity of quenching and cooling has a great relationship with the original structure, the heating temperature and the cooling effect.
Preferably, in the step S2, during the quenching of the wind power gear, the outer diameter of the wind power gear may shrink, and at this time, the outer diameter of the wind power gear may be rapidly cooled, so as to avoid the expansion of the wind power gear.
Preferably, in the step S2, the water is in favor of pearlite transformation of the wind power gear in a high temperature stage, and cooling intensity in the high temperature stage is relatively mild, so that the problem of fission of the wind power gear in the quenching process can be effectively controlled.
Preferably, in the step S3, the temperature sensor mainly includes a noble metal thermocouple and a cheap metal thermocouple. The noble metal thermocouple has graduation number B, R, S, the common type is S-shaped, the working temperature range (0-1600) ". DEG C, the cheap metal thermocouple has graduation number N, K, E, J, T, and the like.
Preferably, in the step S3, the furnace temperature uniformity test of the heat treatment furnace is generally an idle test, and may be a loading test if necessary, and the loading test may be a rated furnace loading, 50% of the rated furnace loading, or a general furnace loading of the process, which should be generally not less than 50% of the rated furnace loading.
Preferably, in the step S3, the furnace should maintain the working state during normal production in the test process, including heating at a common heating rate, maintaining the atmosphere furnace at a common gas amount and pressure, and operating the circulating fan normally.
(III) beneficial effects
Compared with the prior art, the invention provides a quenching cooling uniformity control method for continuous heat treatment of an intensive hot coil, which has the following beneficial effects:
1. according to the quenching cooling uniformity control method for the intensive hot coil continuous heat treatment, the wind power gear is placed in the induction coil, the induction coil is electrified, an induction circuit is gradually generated by the induction coil, when the temperature of the wind power gear is gradually increased, a water pump is started, the surface of the wind power gear is quenched, the quenching depth is generally controlled within 1-2MM, the wind power gear is 54-60HRC in hardness, tempering is carried out at 180 ℃, the quenching cooling uniformity can be controlled, the purpose of controlling the surface uniformity of the wind power gear can be achieved, the quality of the wind power gear is improved, and therefore the use effect of the wind power gear at the later stage is improved.
2. According to the quenching cooling uniformity control method for the intensive hot coil continuous heat treatment, the wind power gear is quenched in a low-temperature salt bath or alkali bath furnace, the temperature of the salt bath or alkali bath is close to an MS point, the wind power gear is kept at the temperature for 2-5 minutes and then is removed for air cooling, the cooling method is called gradient quenching, the internal temperature and the external temperature of the wind power gear are more uniform, and martensitic transformation is performed simultaneously, so that quenching stress can be greatly reduced, deformation and cracking are prevented, after the internal temperature and the external temperature of the wind power gear are consistent and enter a martensitic region, the preset grading temperature is slightly higher than the MS point, and at the moment, the surface of the wind power gear shows different heat transfer properties and quality change processes, and the quenching cooling purpose of the wind power gear can be realized.
3. According to the quenching cooling uniformity control method for the intensive hot coil continuous heat treatment, a temperature sensor is selected, a temperature measuring frame is used for fixing a test thermocouple, the test thermocouple is firmly fixed at a corresponding position of the temperature measuring frame or is placed at a corresponding position in a furnace from a temperature measuring hole, the test thermocouple is led out of the furnace and is directly connected with a test instrument through a compensation wire, the numerical value on the test instrument can be observed at the moment, and the purpose of judging the quenching cooling uniformity is achieved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
Embodiment one:
a quenching cooling uniformity control method for intensive hot coil continuous heat treatment comprises the following steps:
s1, quenching cooling of wind power gear
The wind power gear is quenched in a low-temperature salt bath or an alkali bath furnace, the temperature of the salt bath or the alkali bath is close to an MS point, the wind power gear is kept at the temperature for 2 to 5 minutes and then is removed for air cooling, the cooling method is called gradient quenching, the internal and external temperatures of the wind power gear are more uniform, and martensitic transformation is carried out simultaneously, so that quenching stress can be greatly reduced, deformation and cracking are prevented, after the internal and external temperatures of the wind power gear are consistent and enter a martensitic region, the grading temperature is preset to be slightly higher than the MS point, and at the moment, the surface of the wind power gear shows different heat transfer properties and quality transformation processes.
S2, quenching cooling uniformity control
The wind power gear is placed in the induction coil, the induction coil is electrified, an induction circuit is gradually generated by the induction coil, when the temperature of the wind power gear is gradually increased, a water pump is started, the power of the water pump is controlled between 550 and 1500 watts, the surface of the wind power gear is quenched, the quenching depth is generally controlled within 1-2MM, the wind power gear is 54-60HRC hardness at the moment, tempering is carried out at 180 ℃, and the quenching and cooling uniformity can be controlled.
S3, quenching cooling uniformity test
The temperature sensor is selected and is a temperature measuring frame, the temperature measuring frame is mainly used for fixing a test thermocouple, the thermocouple is judged by adopting a heat-resistant alloy, a stainless steel tube or other proper shape and size of the temperature measuring frame, the test thermocouple is firmly fixed at the corresponding position of the temperature measuring frame or is placed at the corresponding position in a furnace from a temperature measuring hole, the test thermocouple is led out of the furnace and is directly connected with a test instrument through a compensation lead, the numerical value on the test instrument can be observed at the moment, and the uniformity of quenching and cooling is judged.
Firstly, the wind power gear is heated to a temperature Ac3 or Ac1, and the temperature is kept for a period of time. The uniformity of quenching cooling has a great relationship with the original structure, the heating temperature and the cooling effect. In the quenching process of the wind power gear, the outer diameter of the wind power gear is likely to shrink, and the outer diameter of the wind power gear can be rapidly cooled at the moment, so that the phenomenon that the wind power gear expands is avoided. The water is favorable for pearlite transformation of the wind power gear at a high temperature stage, and the cooling intensity at the high temperature stage is relatively mild, so that the problem of fission of the wind power gear in the quenching process can be effectively controlled. The temperature sensor mainly comprises a noble metal thermocouple and a cheap metal thermocouple. The noble metal thermocouple has an index number of B, R, S, is commonly used in an S-type, and has a working temperature range (0-1600) ". DEG C.A furnace temperature uniformity test of the heat treatment furnace is commonly an idle test, and can be also carried out if necessary, wherein the rated furnace loading amount, 50% of the rated furnace loading amount or commonly used furnace loading amount of the process can be adopted in the loading test, and the temperature uniformity test is generally not less than 50% of the rated furnace loading amount. The furnace should be kept in working state during normal production in the test process, including heating up at a common heating rate, keeping the atmosphere furnace at a common gas amount and pressure, and the circulation fan is normally operated.
The quenching cooling uniformity control method for the intensive hot coil continuous heat treatment comprises the steps of quenching a wind power gear in a low-temperature salt bath or an alkaline bath furnace, wherein the temperature of the salt bath or the alkaline bath is close to an MS point, the wind power gear is kept at the temperature for 2 to 5 minutes and then is removed for air cooling, the cooling method is called gradient quenching, the internal temperature and the external temperature of the wind power gear are more uniform, and martensitic transformation is carried out simultaneously, thus greatly reducing quenching stress, preventing deformation and cracking, after the internal temperature and the external temperature of the wind power gear are consistent and enter a martensitic region, the preset grading temperature is slightly higher than the MS point, the surface of the wind power gear shows different heat transfer properties and quality change processes, the quenching cooling purpose of the wind power gear can be realized, the wind power gear is placed inside an induction coil, the induction coil is electrified, the induction circuit is gradually generated by the self, when the temperature of the wind power gear is gradually increased, the water pump is started, the surface of the wind power gear is quenched, the quenching depth is generally controlled within 1-2MM, the wind power gear is 54-60HRC hardness at the moment, tempering is carried out at 180 ℃, the quenching and cooling uniformity can be controlled, the purpose of controlling the uniformity of the surface of the wind power gear can be realized, the quality of the wind power gear is improved, the use effect of the wind power gear at the later stage is improved, the temperature sensor and the temperature measuring rack are selected, the temperature measuring rack is mainly used for fixing the test thermocouple, the test thermocouple is firmly fixed at the corresponding position of the temperature measuring rack or is placed at the corresponding position in the furnace from the temperature measuring hole, the test thermocouple is led out of the furnace and is connected with a test instrument through a compensation wire or directly, at the moment, the numerical value on the test instrument can be observed, and the purpose of judging the quenching and cooling uniformity is realized.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The quenching cooling uniformity control method for the intensive hot coil continuous heat treatment is characterized by comprising the following steps of:
s1, quenching cooling of wind power gear
The wind power gear is quenched in a low-temperature salt bath or an alkali bath furnace, the temperature of the salt bath or the alkali bath is close to an MS point, the wind power gear is kept at the temperature for 2 to 5 minutes and then is removed for air cooling, the cooling method is called gradient quenching, so that the internal and external temperatures of the wind power gear are more uniform, and martensite transformation is carried out simultaneously, the quenching stress can be greatly reduced, deformation and cracking are prevented, after the internal and external temperatures of the wind power gear are consistent and enter a martensite region, the grading temperature is preset to be slightly higher than the MS point, and the surface of the wind power gear shows different heat transfer properties and quality transformation processes;
s2, quenching cooling uniformity control
The wind power gear is placed in the induction coil, the induction coil is electrified, an induction circuit is gradually generated, when the temperature of the wind power gear is gradually increased, a water pump is started, the power of the water pump is controlled between 550 and 1500 watts, the surface of the wind power gear is quenched, the quenching depth is generally controlled within 1-2MM, the wind power gear is 54-60HRC hardness, tempering is carried out at 180 ℃, and the quenching and cooling uniformity can be controlled;
s3, quenching cooling uniformity test
The temperature sensor is selected and is a temperature measuring frame, the temperature measuring frame is mainly used for fixing a test thermocouple, the thermocouple is judged by adopting a heat-resistant alloy, a stainless steel tube or other proper shape and size of the temperature measuring frame, the test thermocouple is firmly fixed at the corresponding position of the temperature measuring frame or is placed at the corresponding position in a furnace from a temperature measuring hole, the test thermocouple is led out of the furnace and is directly connected with a test instrument through a compensation lead, the numerical value on the test instrument can be observed at the moment, and the uniformity of quenching and cooling is judged.
2. The method for controlling quenching and cooling uniformity of continuous heat treatment of an intensive hot coil according to claim 1, wherein in the step S1, the wind power gear is first heated to a temperature Ac3 or Ac1 or higher, and then kept for a period of time.
3. The method for controlling the uniformity of quenching and cooling in the continuous heat treatment of an intensive hot coil according to claim 1, wherein in the step S2, the uniformity of quenching and cooling has a great relationship with the original structure, the heating temperature and the cooling effect.
4. The method for controlling quenching and cooling uniformity of intensive hot coil continuous heat treatment according to claim 1, wherein in the step S2, during the quenching process of the wind power gear, the outer diameter of the wind power gear may shrink, and at this time, the outer diameter of the wind power gear may be rapidly cooled, so as to avoid expansion of the wind power gear.
5. The quenching and cooling uniformity control method for intensive hot coil continuous heat treatment according to claim 1, wherein in the step S2, water is favorable for pearlite transformation of the wind power gear in a high temperature stage, and cooling intensity in the high temperature stage is relatively mild, so that the problem of fission of the wind power gear in the quenching process can be effectively controlled.
6. The method for controlling the quenching and cooling uniformity of continuous heat treatment of an intensive hot coil according to claim 1, wherein in the step S3, the temperature sensor mainly comprises a noble metal thermocouple and a cheap metal thermocouple. The noble metal thermocouple has graduation number B, R, S, the common type is S-shaped, the working temperature range (0-1600) ". DEG C, the cheap metal thermocouple has graduation number N, K, E, J, T, and the like.
7. The quenching and cooling uniformity control method for continuous heat treatment of intensive hot coil according to claim 1, wherein in step S3, the furnace temperature uniformity test of the heat treatment furnace is generally an idle test, and if necessary, a loading test is also carried out, and the loading test can be carried out by using a rated furnace loading amount, 50% of the rated furnace loading amount or a common furnace loading amount of the process, and generally should not be less than 50% of the rated furnace loading amount.
8. The method for controlling the quenching and cooling uniformity of continuous heat treatment of an intensive hot coil according to claim 1, wherein in the step S3, the furnace should be kept in a working state during normal production during the test process, including heating up at a common heating rate, keeping the atmosphere furnace at a common gas amount and pressure, keeping the circulating fan in normal operation, and the like.
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| CN202310800651.8A CN116814941A (en) | 2023-07-03 | 2023-07-03 | Quenching cooling uniformity control method for intensive hot coil continuous heat treatment |
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