CN113862457B - Temperature control method for thermoforming furnace - Google Patents
Temperature control method for thermoforming furnace Download PDFInfo
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- CN113862457B CN113862457B CN202111113212.7A CN202111113212A CN113862457B CN 113862457 B CN113862457 B CN 113862457B CN 202111113212 A CN202111113212 A CN 202111113212A CN 113862457 B CN113862457 B CN 113862457B
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- 238000000034 method Methods 0.000 title claims abstract description 84
- 238000003856 thermoforming Methods 0.000 title claims abstract description 63
- 238000004321 preservation Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 31
- 238000012423 maintenance Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 13
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000001351 cycling effect Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- C21D9/70—Furnaces for ingots, i.e. soaking pits
-
- 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
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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)
- Control Of Temperature (AREA)
Abstract
The invention provides a temperature control method of a thermoforming furnace, which adopts a thermoforming furnace temperature control system to control, can automatically set target temperature, realizes stepped temperature rise, high-temperature heat preservation and stepped temperature reduction of the thermoforming furnace temperature, does not need repeated setting of target temperature by personnel, reduces labor intensity of personnel, avoids the condition of breakage of a conveying roller caused by too low intermediate target temperature due to manual errors, and prolongs the service life of the conveying roller.
Description
Technical Field
The invention belongs to the field of thermoforming, and particularly relates to a temperature control method of a thermoforming furnace.
Background
The hot forming furnace is used for heating billets, is an important process of hot rolling production, and is provided with a plurality of temperature control sections from front to back; according to the technological requirements, the temperature of each temperature control section is maintained within a certain error range, so that the steel billet can be stably heated under the conveying of a conveying rod in a thermoforming furnace, and the heating requirement of the steel billet before hot stamping is completed. But the temperature of the billet furnace needs to be lowered or raised once the furnace needs to be brought into a non-productive phase (temporary shut down, overhaul) or put back into production. And the conveying rod inside the thermoforming furnace is extremely easy to break in the process of rapid cooling or rapid heating, so that unnecessary loss is caused. Therefore, in the heating or cooling process, a person is required to set the target temperature continuously according to the current temperature of the thermoforming furnace, so that the thermoforming furnace is cooled slowly or heated slowly, the whole process takes 8 hours at least, and the labor intensity of the person is greatly increased.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is designed to provide a method for controlling the temperature of a thermoforming oven, which can automatically give a target temperature to be reached next according to the current temperature of the thermoforming oven, and automatically realize slow rise or slow fall of the temperature of the thermoforming oven, so as to greatly reduce labor intensity of personnel and avoid stick breakage caused by excessively high or excessively low setting target temperature of personnel.
To achieve the above and other related objects, the present invention provides a method for controlling a temperature of a thermoforming oven, which is controlled by a thermoforming oven temperature control system, the thermoforming oven temperature control system comprising a first controller, a second controller, a process temperature database and a mode switch; the mode switch is used for switching the connection between the second controller and the first controller or the process temperature database; the hot forming furnace is provided with at least one temperature control section, and the second controller comprises temperature control units which are in one-to-one correspondence with the temperature control sections; each temperature control unit comprises a temperature regulation module, a temperature sensor and a heating element; the process temperature database comprises process set temperatures of different parts in each temperature control section; the temperature control method of the thermoforming furnace comprises the following steps:
when the mode switch receives a heating signal, the mode switch switches the second controller to be connected with the first controller, so that the thermoforming furnace enters a step heating mode;
the first controller receives the process set temperature of the current part in each temperature control section transmitted from the process temperature database, and calls out a preset temperature parameter set of each temperature control section according to the process set temperature of each temperature control section; the temperature parameter set comprises a temperature node parameter set and a temperature node maintenance time parameter set, and the temperature node parameter set comprises temperature nodes T which are sequentially increased 1 Temperature node T 2 Temperature node T 3 … … temperature node T n The method comprises the steps of carrying out a first treatment on the surface of the The temperature node T n The process set temperature is equal to the process set temperature of the corresponding temperature control section; the temperature node maintaining time parameter set comprises temperature node maintaining time t1, temperature node maintaining time t2 and temperature node maintaining time t3 … … which are in one-to-one correspondence with each temperature node, and temperature node maintaining time tn;
the temperature sensor acquires the current temperature value T of each temperature control section in real time and transmits the acquired current temperature value T to the temperature control units corresponding to the first controller and the second controller;
the first controller sequentially searches for a first target temperature T in the temperature node parameter set of the corresponding temperature control section according to the obtained current temperature value T of each temperature control section A And determines a first target temperature maintenance time t A The method comprises the steps of carrying out a first treatment on the surface of the Then the first target temperature T A And a first target temperature maintaining time t A Sending the temperature control signals to a corresponding temperature control unit in the second controller to adjust parameters of the heating element, so that the temperature of the corresponding temperature control section in the thermoforming furnace is increased until the current temperature value T of the corresponding temperature control section reaches the first target temperature T A And maintaining the first target temperature for a time t A Time; the step is circulated until the current temperature value T of each temperature control section reaches the temperature node T of the corresponding temperature control section n The method comprises the steps of carrying out a first treatment on the surface of the The first target temperature T A For the minimum temperature node in all the temperature nodes greater than the current temperature value T in the corresponding temperature node parameter set, the first target temperature maintaining time T A And maintaining time for the temperature node corresponding to the minimum temperature node.
In an embodiment of the invention, the method for controlling the temperature of the thermoforming oven further comprises: when the current temperature values T of all the temperature control sections reach the temperature nodes T of the corresponding temperature control sections n When the hot forming furnace is in a high-temperature heat preservation mode, the mode switch switches the second controller to be connected with the process temperature database; the process temperature database respectively sends the process set temperature of the current part in each temperature control section to the corresponding temperature control unit in the second controller so as to adjust the parameters of each heating element, and the temperature of each temperature control section of the thermoforming furnace is maintained at the corresponding process set temperature.
In an embodiment of the invention, the method for controlling the temperature of the thermoforming oven further comprises:
when the mode switch receives the cooling signal, the second controller is switched to be connected with the first controller, so that the thermoforming furnace enters a stepped cooling mode;
the first controller searches a second target temperature T in reverse order in the temperature setting parameter set of the corresponding temperature control section according to the obtained current temperature value T of each temperature control section B And determining a second target temperature maintenance time t B The method comprises the steps of carrying out a first treatment on the surface of the Then, the first controller sets a second target temperature T B And a second target temperature maintenance time t B Sending the temperature values to the corresponding temperature control units to control parameters of the heating elements so as to cool the corresponding temperature control sections in the thermoforming furnace until the current temperature value T of the corresponding temperature control sections reaches the second target temperature T B And in the second orderTarget temperature T B Maintenance of t B Time; the step is circulated until the current temperature value T of each temperature control section reaches the temperature node T of the corresponding temperature control section 1 The method comprises the steps of carrying out a first treatment on the surface of the The second target temperature T B For the maximum temperature node of all the temperature nodes smaller than the current temperature value T in the corresponding temperature node parameter set, the second target temperature maintaining time T B And maintaining time for the temperature node corresponding to the maximum temperature node.
In an embodiment of the invention, the temperature adjustment module is a PI temperature adjustment module.
In an embodiment of the invention, the first controller is a PC controller.
In an embodiment of the present invention, the temperature node T 1 For ambient temperature or an initial temperature set by the user.
In an embodiment of the present invention, the temperature node T 1 And temperature node T n Each temperature node is obtained by experiments.
As described above, the temperature control method of the thermoforming oven of the invention has the following beneficial effects:
when the first controller receives a heating signal or a cooling signal, the mode switch automatically switches the connection between the second controller and the first controller, so that the first controller calls a preset temperature parameter set of each temperature control section according to the process set temperature of each temperature control section of the thermoforming furnace; then the first controller automatically searches the target temperature and the target temperature maintaining time in the corresponding temperature parameter set according to the current temperature of each temperature control section in real time, and sends the target temperature and the target temperature maintaining time to the corresponding temperature control unit in the second controller to complete heating or cooling of each temperature control section in a PI control mode until the current temperature of each temperature control section meets the requirement, so that the step heating or step cooling of thermoforming is realized, and the problem of roller breakage caused by too large temperature difference between the inside and outside of a conveying roller is avoided; the invention can automatically realize real-time setting of the target temperature according to the current temperature of each temperature control section, thereby greatly reducing the labor intensity of personnel; in addition, the control system is obtained by additionally arranging the first controller and the mode switch on the basis of the existing thermoforming furnace control system (namely the second controller), has low transformation cost and is convenient to popularize and apply.
Drawings
FIG. 1 is a schematic diagram of a temperature control system for a thermoforming oven in accordance with the present invention;
FIG. 2 is a flow chart of a method for heating a thermoforming oven in accordance with the present invention;
FIG. 3 is a flow chart of a method of maintaining a hot forming furnace at high temperature in accordance with the present invention;
FIG. 4 is a flow chart of a method of cooling a thermoforming oven in accordance with the present invention;
description of the reference numerals
A first controller 01, a second controller 02, a process temperature database 03, a mode switch 04.
Description of the embodiments
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
The invention provides a temperature control system of a thermoforming furnace, which is used for controlling the temperature of the thermoforming furnace.
As shown in fig. 1, the thermoforming oven temperature control system comprises a first controller 01, a second controller 02, a process temperature database 03 and a mode switch 04; the first controller 01 is connected with a process temperature database 03; the mode switch 04 is used for switching the connection of the second controller 02 and the first controller 01 or the process temperature database 03 so as to automatically transmit the target temperature to the second controller 02 through the first controller 01 or the process temperature database 03; the thermoforming oven is provided with at least one temperature control section, and the second controller 02 comprises temperature control units which are in one-to-one correspondence with the temperature control sections; each temperature control unit comprises a temperature adjusting module, a temperature sensor and a heating element, the temperature sensor acquires the current temperature value T of the corresponding temperature control section in real time, and the temperature adjusting module adjusts the parameter of the corresponding heating element according to the difference value between the target temperature of the corresponding temperature control section and the current temperature value T, so that the purpose of controlling the temperature of the corresponding temperature control section is achieved; the process temperature database 03 includes process set temperatures of different parts in each temperature control section to transmit the process set temperatures of the current part in each temperature control section to the first controller 01 or the second controller 02.
It is understood that the first controller is a control device such as a PC controller having an input end and a display end, which is not limited thereto, and the PC controller is preferably selected in this embodiment.
It can be understood that the temperature adjusting module is a PI control module, a PID control module, a fuzzy PID control module, or other corresponding control modules of various correction systems, which is not limited to this, and the PI control module is preferably selected in this embodiment.
The first controller 01 and the mode switch 04 are additionally arranged on the original control system of the thermoforming furnace, and the source of the target temperature is switched by switching the temperature mode of the thermoforming furnace, so that the target temperature set value is automatically output to realize the automatic control of the temperature of the thermoforming furnace, thereby meeting the requirement of automatic slow cooling or slow heating of the thermoforming furnace and greatly reducing the labor intensity of personnel.
As shown in fig. 2 to 4, the temperature control method using the above-mentioned temperature control system for a thermal forming furnace includes three operation modes, namely a step heating mode, a high temperature holding mode and a step cooling mode.
When the thermoforming furnace needs to be processed, only a heating signal is input through the first controller 01, and the heating signal is sent to the mode switch 04, so that the mode switch 04 automatically switches the connection between the second controller 02 and the first controller 01, and the thermoforming furnace enters a step heating mode; as shown in fig. 2, the temperature control method of the thermoforming oven in the step-heating mode is shown:
the first controller 01 receives the process set temperature of the current part in each temperature control section transmitted from the process temperature database 03, and calls out a preset temperature parameter set of each temperature control section according to the process set temperature of each temperature control section; the temperature parameter set comprises a temperature node parameter set and a temperature node maintenance time parameter set, and the temperature node parameter set comprises temperature nodes T which are sequentially increased 1 Temperature node T 2 Temperature node T 3 … … temperature node T n The method comprises the steps of carrying out a first treatment on the surface of the The temperature node T n Setting a temperature for a process corresponding to the temperature control section; temperature node T 1 An initial temperature or an ambient temperature set for a user; the temperature node maintaining time parameter set comprises temperature node maintaining time t1, temperature node maintaining time t2 and temperature node maintaining time t3 … … which are in one-to-one correspondence with each temperature node, and temperature node maintaining time tn;
the temperature sensor acquires the current temperature value T of each temperature control section in real time and transmits the acquired current temperature value T to the temperature control units corresponding to the first controller 01 and the second controller 02;
the first controller 01 sequentially searches for a first target temperature T in the temperature node parameter set of the corresponding temperature control section according to the obtained current temperature value T of each temperature control section A And determines a first target temperature maintenance time t A The method comprises the steps of carrying out a first treatment on the surface of the Then the first target temperature T A And a first target temperature maintaining time t A Sending the temperature control signals to a corresponding temperature control unit in the second controller to adjust parameters of the heating element, so that the temperature of the corresponding temperature control section in the thermoforming furnace is increased until the current temperature value T of the corresponding temperature control section reaches the first target temperature T A And at a first target temperature T A Maintenance of t A Time; the step is circulated to continuously obtain a new first target temperature T A And a first target temperature maintaining time t A Until the current temperature value T of each temperature control section reaches the temperature node T of the corresponding temperature control section n The method comprises the steps of carrying out a first treatment on the surface of the The first target temperature T A For the minimum temperature node in all the temperature nodes greater than the current temperature value T in the corresponding temperature node parameter set, the first target temperature maintaining time T A And maintaining time for the temperature node corresponding to the minimum temperature node.
As shown in fig. 3, when the current temperature values T of all the temperature control sections reach the temperature nodes T of the corresponding temperature control sections n When the hot forming furnace is in a high-temperature heat preservation mode (namely a normal working mode), the mode switch 04 automatically switches the connection between the second controller 02 and the process temperature database 03;
the process temperature database 03 respectively sends the process set temperatures of the current part in each temperature control section to the corresponding temperature control units in the second controller 02 so as to adjust the parameters of each heating element, and the temperature of each temperature control section of the thermoforming furnace is maintained at the corresponding process set temperature.
When the thermoforming furnace needs to be stopped, only a cooling signal is input through the first controller 01 and is sent to the mode switch 04, so that the mode switch 04 automatically switches the connection between the second controller 02 and the first controller 01, and the thermoforming furnace enters a stepped cooling mode; as shown in fig. 4, the temperature control method of the thermoforming oven in the step-down mode is shown:
the first controller 01 searches a second target temperature T in reverse order in the temperature setting parameter set of the corresponding temperature control section according to the obtained current temperature value T of each temperature control section B And determining a second target temperature maintenance time t B The method comprises the steps of carrying out a first treatment on the surface of the Then, the first controller sets a second target temperature T B And a second target temperature maintenance time t B Sending the temperature values to the corresponding temperature control units to control parameters of the heating elements so as to cool the corresponding temperature control sections in the thermoforming furnace until the current temperature value T of the corresponding temperature control sections reaches the second target temperature T B And at a second target temperature T B Maintenance of t B Time; the step is circulated to continuously obtain a new second target temperature T B And a second target temperature maintenance time t B Until the current temperature value T of each temperature control section reaches the temperature node T of the corresponding temperature control section 1 The method comprises the steps of carrying out a first treatment on the surface of the The second target temperature T B For corresponding temperature node parameterThe maximum temperature node of all temperature nodes which are smaller than the current temperature value T is concentrated, and the second target temperature is maintained for time T B And maintaining time for the temperature node corresponding to the maximum temperature node.
Further, each temperature node and the corresponding temperature node maintaining time are obtained through experiments, and the situation that the conveying stick is broken due to overlarge temperature difference between two adjacent temperature nodes determined through manual experience is avoided.
In summary, according to the temperature control method of the thermoforming furnace, under the temperature raising and lowering mode, each target temperature parameter can be automatically given through the first controller, so that the temperature of the thermoforming furnace slowly rises or slowly falls in a stepwise manner, and the problem of breakage caused by the fact that the temperature difference between the inside and the outside of a conveying rod is increased due to the fact that the temperature of the thermoforming furnace is raised or lowered too quickly is avoided; meanwhile, the labor intensity of personnel is reduced, and the problem that the conveying stick is broken due to the fact that the target temperature parameter is set too low due to errors is avoided; in addition, the high-temperature heat preservation mode is controlled by the control system of the original thermoforming furnace, so that the energy consumption of the whole control system is effectively reduced.
In summary, the present invention effectively overcomes the various disadvantages of the prior art and has high industrial utility value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (5)
1. The temperature control method of the thermoforming oven adopts a thermoforming oven temperature control system to control, and is characterized in that the thermoforming oven temperature control system comprises a first controller, a second controller, a process temperature database and a mode switch; the mode switch is used for switching the connection between the second controller and the first controller or the process temperature database; the hot forming furnace is provided with at least one temperature control section, and the second controller comprises temperature control units which are in one-to-one correspondence with the temperature control sections; each temperature control unit comprises a temperature regulation module, a temperature sensor and a heating element; the process temperature database comprises process set temperatures of different parts in each temperature control section; the temperature control method of the thermoforming furnace comprises the following steps:
when the mode switch receives a heating signal, the mode switch switches the second controller to be connected with the first controller, so that the thermoforming furnace enters a step heating mode;
the first controller receives the process set temperature of the current part in each temperature control section transmitted from the process temperature database, and calls out a preset temperature parameter set of each temperature control section according to the process set temperature of each temperature control section; the temperature parameter set comprises a temperature node parameter set and a temperature node maintenance time parameter set, and the temperature node parameter set comprises temperature nodes T which are sequentially increased 1 Temperature node T 2 Temperature node T 3 … … temperature node T n The method comprises the steps of carrying out a first treatment on the surface of the The temperature node T n Setting a temperature for a process corresponding to the temperature control section; the temperature node maintaining time parameter set comprises temperature node maintaining time t1, temperature node maintaining time t2 and temperature node maintaining time t3 … … which are in one-to-one correspondence with each temperature node, and temperature node maintaining time tn; the temperature node T 1 And temperature node T n Each temperature node in between is obtained by experiment;
the temperature sensor acquires the current temperature value T of each temperature control section in real time and transmits the acquired current temperature value T to corresponding temperature control units in the first controller and the second controller;
the first controller sequentially searches for a first target temperature T in the temperature node parameter set of the corresponding temperature control section according to the obtained current temperature value T of each temperature control section A And determines a first target temperature maintenance time t A The method comprises the steps of carrying out a first treatment on the surface of the Then the first target temperature T A And a first target temperature maintaining time t A Sending the temperature control signals to a corresponding temperature control unit in the second controller to adjust parameters of the heating element so as to heat a corresponding temperature control section in the thermoforming furnace until the temperature is corresponding to the temperatureThe current temperature value T of the control section reaches the first target temperature T A And maintaining the first target temperature for a time t A Time; the step is circulated until the current temperature value T of each temperature control section reaches the temperature node T of the corresponding temperature control section n The method comprises the steps of carrying out a first treatment on the surface of the The first target temperature T A For the minimum temperature node in all the temperature nodes greater than the current temperature value T in the corresponding temperature node parameter set, the first target temperature maintaining time T A Maintaining time for the temperature node corresponding to the minimum temperature node;
when the current temperature values T of all the temperature control sections reach the temperature nodes T of the corresponding temperature control sections n When the hot forming furnace is in a high-temperature heat preservation mode, the mode switch switches the second controller to be connected with the process temperature database;
the process temperature database respectively sends the process set temperature of the current part in each temperature control section to the corresponding temperature control unit in the second controller so as to adjust the parameters of each heating element, and the temperature of each temperature control section of the thermoforming furnace is maintained at the corresponding process set temperature.
2. The thermoforming oven temperature control method of claim 1, further comprising:
when the mode switch receives the cooling signal, the second controller is switched to be connected with the first controller, so that the thermoforming furnace enters a stepped cooling mode;
the first controller searches a second target temperature T in reverse order in the temperature setting parameter set of the corresponding temperature control section according to the obtained current temperature value T of each temperature control section B And determining a second target temperature maintenance time t B The method comprises the steps of carrying out a first treatment on the surface of the Then, the first controller sets a second target temperature T B And a second target temperature maintenance time t B Sending the temperature values to the corresponding temperature control units to control parameters of the heating elements so as to cool the corresponding temperature control sections in the thermoforming furnace until the current temperature value T of the corresponding temperature control sections reaches the second target temperature T B And at a second target temperature T B Maintenance of t B Time; cycling the step until the current temperature value T of each temperature control section reaches the corresponding valueTemperature node T of temperature control section 1 The method comprises the steps of carrying out a first treatment on the surface of the The second target temperature T B For the maximum temperature node of all the temperature nodes smaller than the current temperature value T in the corresponding temperature node parameter set, the second target temperature maintaining time T B And maintaining time for the temperature node corresponding to the maximum temperature node.
3. The method of claim 1, wherein the temperature regulation module is a PI temperature regulation module.
4. The method of claim 1, wherein the first controller is a PC controller.
5. The method according to claim 1, wherein the temperature node T is a temperature control device 1 For ambient temperature or an initial temperature set by the user.
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