CN115889964A - Gear shifting temperature control method and circuit for hot press welding - Google Patents
Gear shifting temperature control method and circuit for hot press welding Download PDFInfo
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Abstract
The invention relates to the technical field of hot-press welding, and discloses a gear shifting and temperature controlling method and circuit for hot-press welding. The gear shifting temperature control circuit comprises a power grid, an anti-parallel thyristor, a power frequency transformer and a resistor; the two ends of the power grid are respectively connected with the input end of the anti-parallel thyristor and the second pin of the power frequency transformer, the output end of the anti-parallel thyristor is connected with the first pin of the power frequency transformer, and the third pin of the power frequency transformer are respectively connected with the two ends of the resistor. The gear shifting and temperature controlling method comprises the steps that a gear shifting regulating switch outputs a matched gear shifting signal to a control chip according to a gear set by a user; the control chip receives the gear shifting signal and calculates a conduction angle range corresponding to the gear shifting signal; the control chip regulates the voltage output to the gear shifting and temperature controlling circuit in different voltage ranges according to the corresponding conduction angle range so as to realize temperature control and gear shifting. The invention simplifies the circuit structure, reduces the working cost and improves the convenience of the user in the gear shifting and temperature control process.
Description
Technical Field
The invention relates to the technical field of hot-press welding, in particular to a gear shifting and temperature controlling method and circuit for hot-press welding.
Background
The heating principle of the pulse hot-press welder is that pulse heavy current generates heat energy when flowing through high-resistance materials such as molybdenum, titanium and the like, and then the pulse heavy current is in heating contact with a workpiece to be heated so as to conduct heat to the workpiece to be heated. The pulse current heating device is used for instantaneous heating, a thermocouple is connected to the front end of the nozzle to monitor the temperature of the heating nozzle, the temperature is adjusted by controlling the output power, the start and stop of the hot-press welder are accurately controlled by an automatic device control switch, welding can be started when a workpiece needs to be heated, and the temperature of the heating nozzle is controlled according to an actually required temperature curve.
The hot-press welder is generally connected with a multi-winding power frequency transformer through a thyristor output, and the multi-winding power frequency transformer is added on high-resistance metal after voltage reduction. The power adjustment is realized by controlling the conduction angle of the thyristor, and because the resistance value of the heated high-resistance metal is small, the voltage of a power grid needs to be reduced to 1-5V by a step-down transformer, and hundreds of amperes of large current are generated. The voltage shift switch is installed on the operation panel of the machine and used for selecting the turn ratio of the multi-winding transformer.
The method and the circuit for regulating power of the multi-winding transformer by matching with the thyristor have better temperature control effect, but the multi-winding transformer has high cost and large volume, and a gear regulator needs to be added, so that the overall cost is higher. Therefore, the method and circuit for regulating and controlling the temperature of the gear in the hot-press welding process need to be improved, so that the circuit structure is simplified, the working cost is reduced, and the convenience of the process of regulating and controlling the temperature of the gear is improved.
Disclosure of Invention
The invention aims to solve the technical problem of improving the gear shifting and temperature controlling method and the circuit of the hot-press welding so as to simplify the circuit structure, reduce the working cost and improve the convenience of the gear shifting and temperature controlling process.
In a first aspect, the present invention provides a gear shifting and temperature controlling method for thermocompression bonding, where the gear shifting and temperature controlling method is applied to a gear shifting and temperature controlling system, the gear shifting and temperature controlling system includes a gear shifting and temperature controlling circuit, a control chip, and a gear shifting and temperature controlling switch, the control chip establishes communication connections with the gear shifting and temperature controlling circuit and the gear shifting and temperature controlling switch respectively to implement transmission of signals and data information, and the gear shifting and temperature controlling method includes:
the gear shifting regulation and control switch outputs a matched gear shifting signal to the control chip according to a gear set by a user;
the control chip receives the gear shifting signal and calculates a conduction angle range corresponding to the gear shifting signal;
and the control chip regulates the voltage output to the gear shifting and temperature controlling circuit within different voltage ranges according to the corresponding conduction angle range so as to realize temperature control and gear shifting.
Preferably, the transmission in order to realize signal and data information is connected to the gear shifting temperature control system, the display is used for showing monitor interface, gear shifting regulation and control switch according to the gear output assorted gear shifting signal that the user set up extremely control chip includes:
displaying data information in the gear shifting regulation and control switch on the monitoring interface to form a gear shifting regulation and control area for receiving user input information; the gear shifting regulation switch comprises a plurality of preset gears;
matching the corresponding gear in the plurality of preset gears according to user input information;
and matching the output voltages of different grades according to the corresponding gears.
Preferably, before the control chip receives the gear shifting signal and calculates a conduction angle range corresponding to the gear shifting signal, the method further includes:
if the input sampling workpiece temperature is received, comparing the sampling workpiece temperature with a preset temperature to obtain an error value;
inputting the error value into a preset operation model for operation to obtain an output value; the operation model consists of a proportional unit, an integral unit and a differential unit;
obtaining a conduction angle through conversion; the conduction angle is pi minus the output value.
Preferably, the control chip receives the gear shifting signal and calculates a conduction angle range corresponding to the gear shifting signal, including:
the control chip continuously receives the current temperature value input under the corresponding gear;
continuously inputting a plurality of current temperature values into the operation model for operation to obtain a plurality of conduction angles;
and integrating a plurality of the conduction angles to obtain the corresponding conduction angle range.
Preferably, the step-up temperature control circuit adjusts the voltage output to the step-up temperature control circuit within different voltage ranges according to the corresponding conduction angle range, and includes:
the control chip receives input sampled power grid voltage and obtains a power grid phase through a phase-locking algorithm;
and controlling an output port of the control chip to drive in the corresponding conduction angle range, and stopping driving at pi and 2 pi, so that the gear-shifting temperature control circuit is conducted to realize the regulation of the output voltage.
Preferably, the gear shifting control switch is preset with one to five gears.
In a second aspect, an embodiment of the present invention provides a shift adjusting and temperature controlling circuit for thermocompression bonding, where the shift adjusting and temperature controlling circuit uses the steps of the shift adjusting and temperature controlling method according to any one of the embodiments of the first aspect, and the shift adjusting and temperature controlling circuit includes a power grid, an anti-parallel thyristor, a power frequency transformer, and a resistor; the two ends of the power grid are respectively connected with the input end of the anti-parallel thyristor and the second pin of the power frequency transformer, the output end of the anti-parallel thyristor is connected with the first pin of the power frequency transformer, and the third pin and the fourth pin of the power frequency transformer are respectively connected with the two ends of the resistor.
Preferably, the anti-parallel thyristor comprises a first unidirectional thyristor and a second unidirectional thyristor, an anode of the first unidirectional thyristor is connected with a cathode of the second unidirectional thyristor to form a first connection point, the power grid is connected with the first connection point, a cathode of the first unidirectional thyristor is connected with an anode of the second unidirectional thyristor to form a second connection point, a first pin of the power frequency transformer is connected with the second connection point, and a control electrode of the first unidirectional thyristor and a control electrode of the second unidirectional thyristor are respectively connected with the control chip.
Compared with the prior art, the invention has at least one of the following beneficial technical effects:
the gear shifting temperature control circuit comprises a power grid, an anti-parallel thyristor, a power frequency transformer and a resistor; the two ends of the power grid are respectively connected with the input end of the anti-parallel thyristor and the second pin of the power frequency transformer, the output end of the anti-parallel thyristor is connected with the first pin of the power frequency transformer, and the third pin of the power frequency transformer are respectively connected with the two ends of the resistor. The gear shifting and temperature controlling method is applied to a control system of a gear shifting and temperature controlling circuit, and specifically comprises the following steps: the gear shifting regulating switch outputs a matched gear shifting signal to the control chip according to a gear set by a user; the control chip receives the gear shifting signal and calculates a conduction angle range corresponding to the gear shifting signal; the control chip regulates the voltage output to the gear shifting and temperature controlling circuit within different voltage ranges according to the corresponding conduction angle range so as to realize the temperature control and gear shifting.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a shift and temperature control circuit according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of a gear shifting and temperature controlling method according to an embodiment of the present invention.
Fig. 3 is a schematic view of an application scenario of the gear shifting and temperature controlling method according to the embodiment of the present invention.
Fig. 4 is a sub-flow diagram of a gear shifting and temperature controlling method according to an embodiment of the present invention.
Fig. 5 is a schematic view of another sub-process of the method for shifting and controlling temperature according to the embodiment of the present invention.
Fig. 6 is a schematic view of another sub-flow of the gear shifting and temperature controlling method according to the embodiment of the present invention.
Fig. 7 is a schematic view of another sub-process of the method for adjusting gear and controlling temperature according to the embodiment of the present invention.
Description of reference numerals: G. a power grid; t1, a first unidirectional thyristor; t2, a second unidirectional thyristor; t, power frequency transformer; r, resistance; 10. a gear shifting temperature control system; 11. a gear shifting temperature control circuit; 12. a control chip; 13. a gear shifting regulation switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
The problem of high overall cost caused by the fact that a gear regulator needs to be added due to the fact that a multi-winding transformer in the prior art is high in cost and large in size is solved, and the gear shifting and temperature controlling process is complex. The embodiment of the invention provides a gear shifting and temperature controlling circuit for thermocompression bonding. Referring to fig. 1, fig. 1 is a schematic circuit diagram of a shift temperature control circuit according to an embodiment of the present invention.
The gear shifting and temperature controlling circuit comprises a power grid G, an anti-parallel thyristor, a power frequency transformer T and a resistor R, wherein the power frequency transformer T is provided with a first pin, a second pin, a third pin and a fourth pin. Specifically, the power grid G is a single-phase power grid, the anode of the power grid G is connected to the input end of the anti-parallel thyristor, the cathode of the power grid G is connected to the second pin of the power frequency transformer T, the output end of the anti-parallel thyristor is connected to the first pin of the power frequency transformer T, and the third pin and the fourth pin of the power frequency transformer T are respectively connected to two ends of the resistor R. Here, the resistance R is a workpiece to be heated, and the thermocompression bonding performs welding by heating the resistance R. Compared with the existing temperature control circuit, the gear-shifting temperature control circuit removes a multi-winding transformer and a winding gear switch, only keeps the power frequency transformer T with the highest voltage output, and achieves the purpose of adjusting the output voltage in different voltage ranges by limiting the range of the conduction angle.
Further, the anti-parallel thyristor includes a first unidirectional thyristor T1 and a second unidirectional thyristor T2. The anode of the first unidirectional thyristor T1 is connected with the cathode of the second unidirectional thyristor T2 to form a first connecting point, the first connecting point is the input end of the anti-parallel thyristor, and the anode of the power grid G is connected with the first connecting point; the cathode of the first unidirectional thyristor T1 is connected with the anode of the second unidirectional thyristor T2 to form a second connection point, the second connection point is the output end of the anti-parallel thyristor, and the first pin of the power frequency transformer T is connected with the second connection point; the control electrode of the first unidirectional thyristor T1 and the control electrode of the second unidirectional thyristor T2 are respectively connected with the control chip so as to control the switching of the first unidirectional thyristor T1 and the second unidirectional thyristor T2.
On the other hand, the embodiment of the invention provides a gear shifting and temperature controlling method for hot press welding, which optimizes the existing gear shifting and temperature controlling method, simplifies the circuit structure, reduces the working cost and improves the convenience of the gear shifting and temperature controlling process of a user. Referring to fig. 2 and fig. 3, fig. 2 is a schematic flow chart of a gear shifting temperature control method according to an embodiment of the present invention, and fig. 3 is a schematic application scenario diagram of the gear shifting temperature control method according to the embodiment of the present invention.
In this embodiment, the gear shifting temperature control method is applied to a gear shifting temperature control system 10, the gear shifting temperature control system 10 includes a gear shifting temperature control circuit 11, a control chip 12 and a gear shifting control switch 13, the control chip 12 establishes communication connection with the gear shifting temperature control circuit 11 and the gear shifting control switch 13 respectively to realize transmission of signals and data information, and the specific implementation process of the gear shifting temperature control method provided in the embodiment of the present invention is described in detail below. As shown in fig. 2, the method includes steps S110 to S130.
And S110, outputting a matched gear shifting signal to the control chip 12 by the gear shifting regulation switch 13 according to a gear set by a user.
Referring to fig. 4, in a specific embodiment, the gear-shifting temperature-controlling system 10 is connected to a display for transmitting signals and data information, the display is used for displaying a monitoring interface, and the step S110 includes the steps of: s111, displaying data information in the gear shifting regulation switch 13 on the monitoring interface to form a gear shifting regulation area for receiving information input by a user; the input information of the user can be an actually required output voltage value, a sampled workpiece temperature, an actually required temperature value and the like; the gear shifting regulating switch 13 comprises a plurality of preset gears; s112, matching the corresponding gear in the preset gears according to user input information; and S113, matching output voltages of different grades according to the corresponding gears.
In order to achieve the purpose of voltage regulation, a shift regulating switch 13 is added on the monitoring interface in this embodiment, the preset gears of the shift regulating switch 13 have one to five gears, specifically, a first gear, a second gear, a third gear, a fourth gear and a fifth gear, and the shift temperature control system 10 matches the corresponding gear of the shift regulating switch 13 preset in the system according to the input information of the user.
And S120, the control chip 12 receives the gear shifting signal and calculates a conduction angle range corresponding to the gear shifting signal.
Referring to fig. 5, in an embodiment, before the step S120, the method further includes the steps of: s101, if the input sampling workpiece temperature is received, comparing the sampling workpiece temperature with a preset temperature to obtain an error value; s102, inputting the error value into a preset operation model for operation to obtain an output value beta; the operation model consists of a proportional unit, an integral unit and a differential unit; s103, obtaining a conduction angle through conversion; the conduction angle is pi minus the output value: α = π - β.
The operation model is a PID controller, which is set by three parameters, namely a proportional parameter (Kp) of a proportional unit, an integral parameter (Ki) of an integral unit and a differential parameter (Kd) of a differential unit, and is mainly suitable for a system with basically linear and dynamic characteristics not changing along with time.
Referring to fig. 6, in an embodiment, step S120 includes the steps of: s121, the control chip 12 continuously receives the current temperature value input under the corresponding gear; s122, continuously inputting a plurality of current temperature values into the operation model for operation to obtain a plurality of conduction angles; and S123, integrating a plurality of conduction angles to obtain the corresponding conduction angle range.
S130, the control chip 12 adjusts the voltage output to the gear shifting and temperature controlling circuit 11 in different voltage ranges according to the corresponding conduction angle range, so as to implement temperature control and gear shifting.
Referring to fig. 7, in an embodiment, step S130 includes the steps of: s131, the control chip 12 receives the input sampled power grid voltage and obtains a power grid phase through a phase-locking algorithm; and S132, controlling the output port of the control chip 12 to drive in the corresponding conduction angle range, and stopping driving at pi and 2 pi, so as to conduct the gear-shifting temperature control circuit 11 and realize the regulation of the output voltage.
Specifically, the present embodiment calculates the effective value of the output voltage by an equation:
wherein the rated voltage of the power grid is
The positive conduction angle is alpha, and the negative conduction angle is alpha + pi. The conduction angle refers to the angle of conduction controlled by a power electronic device (such as a thyristor) in one period, the output voltage and the current can be controlled by controlling the conduction angle of the thyristor, and the conduction angle is 0 degree from negative to positive zero crossing and 180 degrees from positive to negative zero crossing. It can be seen that the conduction angle range is 0 < α < π, and the output voltage effective value is smaller as α angle is larger, whereas the output voltage effective value is larger as α angle is smaller. When alpha =0, outputting the effective value U of the voltage 0 And maximum, equal to the rated voltage effective value U, and when α = pi, the output voltage effective value is 0. The maximum voltage value is determined by the gear adjustment setting of the gear-shifting control switch 13, and the conduction angle alpha is adjusted to realize the adjustment from the voltage 0V to the maximum voltage value, so that the aim of controlling the temperature is fulfilled finally.
For example, when the effective value of the output voltage is 1V, and the effective value of the rated voltage is 5V, the effective value of the output voltage is 0.2 times of the effective value of the rated voltage, and pi takes a value of 3.1416, which can be obtained according to the above equation:
because the conduction angle alpha range is 0 < alpha < pi, a value obtained by a digital signal processing model (MATLAB tool) by adopting a method of substituting values is 0.81318 pi, and when the alpha =0.81318 pi, the effective value of the output voltage is 1V. Therefore, when the positive conduction angle is controlled to be 0.8132 pi-pi and the negative conduction angle is controlled to be 1.8132 pi-2 pi, the regulation of the effective value of the output voltage between 0 and 1V can be realized; similarly, other ranges of the fourth-gear conduction angle α can be obtained, and the ranges of the conduction angles α shown in the following table are integrated.
| Output voltage | Range of voltage regulation | Alpha range |
| 1V | 0～1V | Positive conduction angle: 0.8132 pi-pi; negative conduction angle: 1.8132 pi-2 pi |
| 2V | 0～2V | Positive conduction angle: 0.6915 pi-pi; negative conduction angle: 1.6915 pi-pi |
| 3V | 0～3V | Positive conduction angle: 0.5711 pi-pi; negative conduction angle: 1.5711 pi-pi |
| 4V | 0～4V | Positive conduction angle: 0.4288 pi-pi; negative conduction angle: 1.4288 pi-pi |
| 5V | 0～5V | Positive conduction angle: 0 to pi; negative conduction angle: pi-2 pi |
Because the control chip 12 samples the voltage of the power grid to obtain the phase of the power grid through a phase-locked algorithm, and then obtains the conduction angle alpha according to the operation model, the output port of the control chip 12 can respectively send out driving at the conduction angles alpha and alpha + pi, and stops driving at the pi and 2 pi, so that the thyristor is conducted in two intervals of alpha-pi and (alpha + pi) -2 pi, and the regulation of the output voltage and the control of the temperature are realized.
The implementation principle of the gear shifting and temperature controlling method and the circuit for the hot-press welding of the embodiment of the invention is as follows: the gear shifting temperature control circuit 11 comprises a power grid G, an anti-parallel thyristor, a power frequency transformer T and a resistor R; the two ends of the power grid G are respectively connected with the input end of the anti-parallel thyristor and the second pin of the power frequency transformer T, the output end of the anti-parallel thyristor is connected with the first pin of the power frequency transformer T, and the third pin of the power frequency transformer T are respectively connected with the two ends of the resistor R. The gear shifting and temperature controlling method is applied to a gear shifting and temperature controlling system 10, and specifically comprises the following steps: the gear shifting regulating switch 13 outputs a matched gear shifting signal to the control chip 12 according to a gear set by a user; the control chip 12 receives the gear shifting signal and calculates a conduction angle range corresponding to the gear shifting signal; the control chip 12 adjusts the voltage output to the shift and temperature control circuit 11 in different voltage ranges according to the corresponding conduction angle range, so as to realize temperature control and shift.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a transfer accuse temperature method for thermocompression bonding, transfer accuse temperature method is applied to transfer accuse temperature control system in, transfer accuse temperature control system includes transfer accuse temperature circuit, control chip and transfer regulation and control switch, control chip respectively with transfer accuse temperature circuit and transfer regulation and control switch set up communication connection in order to realize the transmission of signal and data information, its characterized in that:
the gear shifting regulation and control switch outputs a matched gear shifting signal to the control chip according to a gear set by a user;
the control chip receives the gear shifting signal and calculates a conduction angle range corresponding to the gear shifting signal;
and the control chip regulates the voltage output to the gear shifting and temperature controlling circuit within different voltage ranges according to the corresponding conduction angle range so as to realize temperature control and gear shifting.
2. The method according to claim 1, wherein the shift and temperature control system is connected to a display for transmitting signals and data information, the display is used for displaying a monitoring interface, and the shift control switch outputs matched shift signals to the control chip according to a shift set by a user, the method comprising:
displaying data information in the gear shifting regulation switch on the monitoring interface to form a gear shifting regulation area for receiving information input by a user; the gear shifting regulation switch comprises a plurality of preset gears;
matching corresponding gears in the preset gears according to user input information;
and matching the output voltages of different grades according to the corresponding gears.
3. The method according to claim 2, wherein before the control chip receives the shift signal and calculates a conduction angle range corresponding to the shift signal, the method further comprises:
if the input sampling workpiece temperature is received, comparing the sampling workpiece temperature with a preset temperature to obtain an error value;
inputting the error value into a preset operation model for operation to obtain an output value; the operation model consists of a proportional unit, an integral unit and a differential unit;
obtaining a conduction angle through conversion; the conduction angle is pi minus the output value.
4. The method according to claim 3, wherein the step of receiving the shift signal and calculating the conduction angle range corresponding to the shift signal by the control chip comprises:
the control chip continuously receives the current temperature value input under the corresponding gear;
continuously inputting a plurality of current temperature values into the operation model for operation to obtain a plurality of conduction angles;
and integrating a plurality of the conduction angles to obtain the corresponding conduction angle range.
5. The method according to claim 4, wherein the step-adjusting and temperature-controlling method for thermocompression bonding, in which the control chip adjusts the voltage output to the step-adjusting and temperature-controlling circuit in different voltage ranges according to the corresponding conduction angle ranges, comprises:
the control chip receives input sampled power grid voltage and obtains a power grid phase through a phase-locking algorithm;
and controlling an output port of the control chip to drive in the corresponding conduction angle range, and stopping driving at pi and 2 pi, so that the gear-shifting temperature control circuit is conducted to realize the regulation of the output voltage.
6. The method according to claim 1, wherein the shift control switch is preset to have one to five shifts.
7. A gear shifting and temperature controlling circuit for thermocompression bonding is characterized in that the gear shifting and temperature controlling circuit applies the steps of the gear shifting and temperature controlling method according to any one of claims 1 to 6, and comprises a power grid, an anti-parallel thyristor, a power frequency transformer and a resistor;
the two ends of the power grid are respectively connected with the input end of the anti-parallel thyristor and the second pin of the power frequency transformer, the output end of the anti-parallel thyristor is connected with the first pin of the power frequency transformer, and the third pin and the fourth pin of the power frequency transformer are respectively connected with the two ends of the resistor.
8. The shift and temperature control circuit for thermocompression bonding of claim 7 wherein the antiparallel thyristor comprises a first unidirectional thyristor and a second unidirectional thyristor, the anode of the first unidirectional thyristor is connected to the cathode of the second unidirectional thyristor to form a first connection point, the grid is connected to the first connection point, the cathode of the first unidirectional thyristor is connected to the anode of the second unidirectional thyristor to form a second connection point, the first pin of the power frequency transformer is connected to the second connection point, and the control electrode of the first unidirectional thyristor and the control electrode of the second unidirectional thyristor are respectively connected to the control chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211644696.2A CN115889964A (en) | 2022-12-20 | 2022-12-20 | Gear shifting temperature control method and circuit for hot press welding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211644696.2A CN115889964A (en) | 2022-12-20 | 2022-12-20 | Gear shifting temperature control method and circuit for hot press welding |
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| CN115889964A true CN115889964A (en) | 2023-04-04 |
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| CN202211644696.2A Pending CN115889964A (en) | 2022-12-20 | 2022-12-20 | Gear shifting temperature control method and circuit for hot press welding |
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