CN111742612B - Heating device and heating method - Google Patents
Heating device and heating method Download PDFInfo
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- CN111742612B CN111742612B CN201980014041.7A CN201980014041A CN111742612B CN 111742612 B CN111742612 B CN 111742612B CN 201980014041 A CN201980014041 A CN 201980014041A CN 111742612 B CN111742612 B CN 111742612B
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/40—Direct resistance heating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
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Abstract
A heating apparatus for heating a workpiece made of metal, comprising: a heater for heating the workpiece; a temperature detector that detects a temperature of the workpiece before being heated by the heater; a heating energy calculation unit that calculates energy required for raising the temperature of the workpiece to a heating temperature by the heater, based on a temperature difference between the temperature detected by the temperature detector and the target heating temperature; and a control section that controls the heater to apply the heating energy calculated by the heating energy calculation section to the workpiece.
Description
Cross Reference to Related Applications
The international application claims priority to japanese patent application No. 2018-137780, which was filed to the office on day 23/7/2018, and the entire contents of japanese patent application No. 2018-137780 are incorporated by reference into the international application.
Technical Field
The present disclosure relates to a heating device for heating a workpiece made of metal and a heating method.
Background
For example, in the invention described in patent document 1, (1) before the heating process, an output pattern of electric energy required to obtain a desired temperature raising pattern is determined by performing energization heating while measuring the temperature of a workpiece such as a steel plate with a contact thermometer, and after the output pattern, an actual voltage and an actual current at that time are stored in a storage device, and (2) the workpiece is energized and heated by controlling the output of the electric energy in accordance with the stored output pattern.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2011-82006
Disclosure of Invention
Problems to be solved by the invention
However, in the invention described in patent document 1, since the workpiece is heated and raised in temperature only based on the output pattern of the actual voltage and the actual current determined in advance, there is a high possibility that such a problem occurs at the end of energization: the temperature of the workpiece does not rise to a target heating temperature (hereinafter referred to as a "target temperature"), the temperature of the workpiece exceeds the target temperature, or the like.
In view of the above, the present disclosure provides one example of a heating apparatus or a heating method that raises the temperature of a workpiece to a target temperature with high accuracy.
Means for solving the problems
A heating device for a metal workpiece according to an aspect of the present disclosure includes: the heating apparatus includes a heater that heats a workpiece, a temperature detector that detects a temperature of the workpiece before being heated by the heater, a heating energy calculation portion that calculates energy required To raise the temperature of the workpiece To a heating temperature by the heater based on a temperature difference between a detected temperature (To) detected by the temperature detector and a target heating temperature (Tt), and a control portion that controls the heater To apply the heating energy calculated by the heating energy calculation portion To the workpiece.
In the invention described in patent document 1, the temperature of the workpiece before heating (hereinafter referred to as "initial temperature") is not taken into consideration, and therefore, even if electric energy is applied to the workpiece in a predetermined output pattern, the temperature of the workpiece cannot be raised to the target temperature with high accuracy.
That is, when the actual initial temperature is higher than the initial temperature at the time of determining the output mode, the workpiece is heated and raised to a temperature exceeding the target temperature. On the other hand, when the actual initial temperature is lower than the initial temperature at the time of determining the output mode, the workpiece is not heated and is raised to the target temperature.
In contrast, in the present disclosure, the heating energy is calculated from the temperature difference between the detected temperature (To) detected by the temperature detector and the target heating temperature (Tt), and therefore, the influence of the detected temperature (To), that is, the initial temperature, can be reduced. Therefore, the temperature of the workpiece can be raised to the target temperature with high accuracy.
Further, the present application provides a heating apparatus for a workpiece that heats a workpiece made of metal, the heating apparatus comprising: a heater that heats the workpiece, a temperature detector that detects a temperature of the workpiece before the workpiece is heated by the heater, a heating energy calculation unit that calculates heating energy required to raise the temperature of the workpiece to the heating temperature by the heater based on a temperature difference between a detected temperature detected by the temperature detector and a target heating temperature, and a control unit that controls the heater to apply the heating energy calculated by the heating energy calculation unit to the workpiece; the heater is an electric heater for raising a temperature of the workpiece by applying an electric current to the workpiece, the control section includes a storage section for storing an electric conduction pattern indicating a relationship between an elapsed time from a start of the electric conduction and an electric current value, the control section changes the electric current value in accordance with the elapsed time from the start of the electric conduction so as to realize the electric conduction pattern stored in advance in the storage section, the control section interrupts the electric conduction without gradually decreasing the electric current value from a maximum electric conduction state when a difference between a maximum path cross-sectional area and a minimum path cross-sectional area in an electric current conduction path for the electric current to the workpiece is smaller than a predetermined value, and when a difference between the maximum path cross-sectional area and the minimum path cross-sectional area in the electric current conduction path for the electric current to the workpiece is larger than or equal to the predetermined value, after the current value is gradually decreased from the maximum energization state, the energization is cut off.
There is also provided a method of heating a workpiece made of metal, the method being characterized by comprising the steps of: a heating step of heating the workpiece by a heater, a temperature detection step of detecting a temperature of the workpiece before heating in the heating step, and a heating energy calculation step of calculating heating energy required to raise the temperature of the workpiece to the heating temperature based on a temperature difference between the detected temperature detected in the temperature detection step and a target heating temperature; controlling the heater to apply the heating energy calculated in the heating energy calculation step to the workpiece, the heater being an energization heater that heats the workpiece by applying a current to the workpiece, the energization heater being configured to realize an energization pattern predetermined in accordance with a shape of the workpiece by changing a current value when a relationship between an elapsed time from a start of energization and the current value is referred to as an energization pattern, the energization heater being configured to cut off energization without gradually decreasing the current value from a maximum energization state when a difference between a maximum path cross-sectional area and a minimum path cross-sectional area in an energization path of the current energizing the workpiece is smaller than a predetermined value, and the heater being configured to apply the heating energy calculated in the heating energy calculation step to the workpiece when a difference between the maximum path cross-sectional area and the minimum path cross-sectional area in the energization path of the current energizing the workpiece is greater than or equal to the predetermined value, after the current value is gradually decreased from the maximum energization state, the energization is cut off.
Drawings
Fig. 1 is a schematic view of a heating device of an embodiment of the present disclosure.
Fig. 2A is a graph showing an energization pattern and one example of a change in elapsed time and temperature from the start of energization.
Fig. 2B is a graph showing another example of the energization pattern and the elapsed time from the start of energization and the temperature change.
Fig. 3 is a diagram showing the temperature measurement site in fig. 2A and 2B.
Fig. 4 is a diagram illustrating a heating method according to an embodiment of the present disclosure.
Detailed Description
The following embodiment shows one example of an embodiment that falls within the technical scope of the present disclosure. The specific features and the like described in the claims are not limited to the specific configurations and structures shown in the following embodiments.
In the present embodiment, the heating apparatus and the heating method of the present disclosure are applied to a heating apparatus that heats a stabilizer (hereinafter, referred to as a "workpiece") for a vehicle. A stabilizer for a vehicle is a torsion bar made of metal that connects left and right suspension devices.
(first embodiment)
1. Structure of heating device
The heating device heats the workpiece W to be heated, and raises the temperature of the workpiece W.
As shown in fig. 1, the heating device 1 includes a heater 10, a heating control device 30, and the like. The heater 10 heats the workpiece W. The heating control device 30 controls the output of the heater 10.
The heater 10 is an electric heater for heating the workpiece W by applying an electric current to the workpiece W. That is, the heater 10 energizes the workpiece W through the energizing electrodes 11 connected to both ends of the workpiece W in the longitudinal direction, and raises the temperature of the workpiece W by heat generated by joule heat loss generated between the two energizing electrodes 11.
The heating control device 30 includes a temperature detection device 20, a control unit 31, a selection unit 32, a warning unit 33, and the like. The temperature detection device 20 detects the temperature of the workpiece W. The control unit 31 controls the amount of current to be supplied to the workpiece W. The selection unit 32 is an operation unit operated by an operator. The warning unit 33 issues a warning by means of transmitting information to the operator through five senses, such as sound or a warning lamp.
The temperature detection device 20 includes a temperature detector 21, a temperature calculation unit 22, and the like. The temperature detector 21 is constituted by a non-contact thermometer such as an infrared thermal imaging device. The temperature calculation unit 22 converts the output signal from the temperature detector 21 into a temperature.
The temperature detector 21, which is a non-contact thermometer, outputs temperature energy thermally radiated from the workpiece as an electrical signal. The temperature calculation unit 22 converts the output signal from the temperature detector 21 into a temperature based on the radiation rate of the workpiece W stored in advance.
The temperature calculation unit 22 outputs, To the heating energy calculation unit 34, a temperature detected by the workpiece W before heating by the heater 10 (hereinafter, referred To as "pre-heating temperature To"), for the workpiece W To be heated by the heater 10.
The heating energy calculation unit 34 calculates energy (hereinafter, referred To as "heating energy E") required for the heater 10 To raise the temperature of the workpiece W from the pre-heating temperature To the target temperature Tt, based on a temperature difference between the target heating temperature (hereinafter, referred To as "target temperature Tt") and the pre-heating temperature To of the workpiece W.
The target temperature Tt is generally a temperature higher than the pre-heating temperature To, and therefore the heating energy E is a function of the target temperature Tt minus the pre-heating temperature To (Tt-To), i.e., E ═ f (Tt-To).
In the case where the ambient temperature of the heating apparatus 1 is substantially constant at normal temperature (for example, about 25 ℃), the above function can be regarded as a linear function if the workpiece W is the same. However, when the ambient temperature is lower than the normal temperature or when the ambient temperature changes greatly, the amount of heat radiated from the workpiece W greatly changes depending on the temperature difference between the workpiece W and the ambient temperature. Therefore, in this case, it is necessary to change the function to a function that takes into account the temperature difference between the workpiece W and the ambient temperature.
The control section 31 controls the energization total energization power output to the heater 10 to apply the heating energy E to the workpiece. Specifically, the control unit 31 controls the heater 10 such that the electric power, which is the area surrounded by the thick solid line P, becomes the heating energy E by controlling the voltage applied to the workpiece W as shown by the thick solid line P in fig. 2A or 2B, for example.
Hereinafter, the relationship between the elapsed time from the start of energization and the current value is referred to as "energization mode". Fig. 2A or 2B shows a relationship between an elapsed time from the start of energization and an applied voltage. The current value is uniquely determined by the resistance value according to the applied voltage, and therefore the thick solid line P in fig. 2A or 2B shows the pattern of the heating control output, i.e., the "energization pattern".
As shown in fig. 1, the control unit 31 has a storage unit 31A that stores the energization pattern. The control unit 31 controls the applied voltage, that is, the current value of the current to be applied, based on the elapsed time from the start of the current application so as to obtain the current application pattern stored in the storage unit 31A in advance.
The warning unit 33 issues a warning when the time difference between the elapsed time from the start of heating when the energization is started to the completion of the application of the heating energy E and the previously stored elapsed time is greater than the previously stored time.
The "elapsed time stored in advance" is a time that differs depending on the material, shape, size, and the like of the workpiece W, and is determined by a pre-trial energization test or the like. The determined time is stored in advance in the storage unit 31A in association with the energization pattern.
2. Power-on mode
For example, as shown in fig. 2A, an energization pattern in which energization is interrupted after an applied voltage is gradually decreased from a maximum energization state in which the applied voltage is maximized to decrease a current value is referred to as "energization pattern a". The gradual decrease of the applied voltage also includes a case where the applied voltage is decreased stepwise.
On the other hand, as shown in fig. 2B, the energization pattern in which energization is interrupted without gradually decreasing the current value from the maximum energization state is referred to as "energization pattern B".
The "maximum current supply state" refers to a "state in which the maximum current value flows in the current supply mode at the time of current supply". Therefore, when the energization pattern is different, the maximum current value may be different.
As is apparent from fig. 2A and 2B, when the energization pattern a is compared with the energization pattern B, the energization time in the energization pattern B is shorter than that in the energization pattern a when the heating energy E is the same. Therefore, in order to apply the heating energy E to the workpiece W in a short time, the energization pattern B is preferably adopted.
However, through experiments and studies conducted by the present inventors, it has been found that if the difference between the maximum path cross-sectional area and the minimum path cross-sectional area in the current-carrying path of the current carrying the workpiece W is large, it is difficult to uniformly raise the temperature of the entire workpiece W. Hereinafter, the difference between the maximum path cross-sectional area and the minimum path cross-sectional area is referred to as "area difference".
In the graphs shown in fig. 2A and 2B, a plurality of graphs a to h other than the thick solid line P are graphs showing changes in elapsed time and temperature from the start of energization when the workpieces W of the same shape made of the same material are energized. The graphs a to h showing the temperature changes correspond to the respective portions a to h of the workpiece W shown in fig. 3.
As shown in fig. 2B, when the area difference is large, the temperature variation in one workpiece W becomes large when the energization is performed in the energization mode B. However, even when the area difference is large, if the energization mode a is performed, the temperature deviation in one workpiece W can be reduced as compared with the case of the energization mode B.
According to experiments and studies conducted by the present inventors, it was found that if the area difference is 1% or more, it is difficult to uniformly raise the temperature of the entire workpiece W. It was confirmed through experiments that when the energization pattern a is energized when the area difference is large, the temperature deviation of about 5 to 10 ℃ can be reduced as compared with the energization pattern B.
Therefore, in the present embodiment, a storage unit 31A capable of storing a plurality of energization patterns is used, and a selection unit 32 is provided for selecting which one of the energization patterns stored in advance in the storage unit 31A is used by the selection unit 32. The controller 31 heats the workpiece W in the energization pattern selected by the operator through the selector 32.
3. Heating method
Fig. 4 is an operation diagram showing an outline of a heating method performed by the heating apparatus 1. In the following description, the reference numerals in parentheses denote the respective steps (steps) shown in fig. 4.
When the workpiece W is carried into the heating apparatus 1, a temperature detection step (S1) is first performed, in which the temperature of the workpiece W is detected based on the output signal of the temperature detector 21. Next, a heating energy calculating step (S5) is performed, in which the heating energy E is calculated from the temperature difference between the pre-heating temperature To detected by the temperature detecting step (S1) and the target temperature Tt.
Then, the workpiece W whose pre-heating temperature To was detected in the temperature detection step (S1) is heated by energization in the energization pattern selected in advance by the operator, and the heating step (S10) is executed. When the heating step (S10) is started, it is determined whether the heating energy E calculated in the heating energy calculation step (S5) has been applied to the workpiece W, that is, whether the energization according to the selected energization pattern has been completed (S15).
When the application of the heating energy E to the workpiece W is completed (S15: YES), it is judged whether or not the time difference between the elapsed time from the start of heating to the time when the application of the heating energy E is completed and the previously stored elapsed time is larger than the previously stored time (S20).
At this time, if it is determined that the time difference between the elapsed time from the start of heating to the completion of the application of the heating energy E and the previously stored elapsed time is greater than the previously stored time (S20: YES), the warning unit 33 issues a warning (S25).
When the energization heating is completed after the warning (S25) or in the case where the warning is not executed (S20: no), the heating of the workpiece W is ended, and S1 is executed for the next workpiece W.
4. Characteristics of the heating device and the heating method of the present embodiment
In the present embodiment, the heating energy E is calculated from the temperature difference between the pre-heating temperature To detected by the temperature detector 21 and the target temperature Tt, and therefore the temperature of the workpiece W can be raised To the target temperature with high accuracy.
The control unit 31 of the present embodiment changes the current value in accordance with the elapsed time from the start of energization so as to set the energization pattern stored in advance in the storage unit 31A.
Thus, since the energization pattern corresponding to the shape or the like of the workpiece W can be stored in the storage unit 31A in advance, the energization heating can be performed in the energization pattern corresponding to the shape or the like of the workpiece W. Further, the temperature of the entire workpiece W can be raised substantially uniformly to the target temperature.
The control unit 31 of the present embodiment is characterized in that the workpiece is heated in the energization mode selected by the selection unit 32. Thus, since the workpiece can be heated in the energization pattern suitable for each workpiece W, the workpiece can be heated to the target temperature with high accuracy even for workpieces W of various shapes.
Since the noncontact thermometer detects the temperature based on the temperature energy radiated from the workpiece W, if the property and state of the workpiece surface (hereinafter referred to as "surface property") and the emissivity change, the difference between the detected temperature and the true temperature (hereinafter referred to as "detection error") also changes. That is, if the surface properties and the emissivity of the workpiece W change greatly, the detection error also increases.
However, when the temperature of the workpiece W is low, the detection error with respect to the change in the surface property and emissivity of the workpiece may be small enough to cause practically no problem.
That is, when the temperature of the workpiece W is low, even with a non-contact thermometer, the temperature of the workpiece can be detected with accuracy to such an extent that no problem actually occurs without being greatly affected by surface properties or the like. The case where the temperature of the workpiece is low means, for example, a temperature range of about 0 ℃ to 30 ℃.
That is, assuming that the detection error is 10%, the detection error occurring when the temperature of the workpiece W is low is about 3 ℃. In the case where the target temperature Tt is, for example, 200 ℃, a temperature difference of 3 ℃ at maximum may be generated in the heated temperature with respect to the target temperature Tt.
The temperature difference of 3 ℃ is a small temperature difference of not reaching 10% with respect to 200 ℃. Therefore, there is practically no problem. In contrast, in an apparatus that heats a workpiece W while detecting the temperature of the workpiece W, a temperature difference of at most 20 ℃ may occur with respect to a target temperature Tt of 200 ℃.
A contact thermometer such as a thermocouple has a problem that a time required for temperature detection is longer than that of a non-contact thermometer, although a detection error is small without being greatly affected by surface properties or the like, as compared with a non-contact thermometer.
In contrast, in the present embodiment, the temperature of the workpiece is detected by the noncontact thermometer before the workpiece W is heated, that is, when the temperature of the workpiece W is low, so that the temperature of the workpiece can be detected with accuracy to such an extent that no problem actually occurs in a short time. Therefore, the temperature of the workpiece W can be quickly raised to the target temperature with high accuracy.
In the present embodiment, the warning unit 33 is provided, and the warning unit 33 issues a warning when the time difference between the elapsed time from the start of heating to the completion of applying heating energy and the previously stored elapsed time is greater than the previously stored time.
That is, the heating energy E is theoretically the same for the same kind of workpieces having the same shape and material. Therefore, when the time difference between the elapsed time from the start of heating to the time when the application of the heating energy E is completed and the elapsed time stored in advance is larger than the time stored in advance, the heating device has a high possibility of generating an abnormality. Therefore, in the present embodiment, a warning is issued in the above situation.
In the present embodiment, when the difference between the maximum path cross-sectional area and the minimum path cross-sectional area in the current flow path for the current to the workpiece W is smaller than a predetermined value, the current is cut off without gradually decreasing the current value from the maximum current flow state.
On the other hand, when the difference between the maximum path cross-sectional area and the minimum path cross-sectional area in the current flow path for the current to the workpiece W is equal to or greater than a predetermined value, the current is gradually decreased from the maximum current flow state, and then the current flow is interrupted.
Accordingly, since the workpiece can be heated in the energization pattern suitable for the workpiece W, the temperature of the workpiece can be raised to the target temperature with high accuracy even for workpieces of various shapes.
(other embodiments)
In the above embodiments, the embodiments of the present disclosure have been described with the stabilizer as the workpiece W. However, the applicable objects of the present disclosure are not limited to the stabilizer. The present disclosure can also be applied to other metal products such as a coil spring, a torsion bar, a leaf spring, and the like.
In the above-described embodiment, the heating apparatus and the heating method of the present disclosure are applied to heating performed before coating, but the present disclosure is not limited thereto, and can also be applied to heat treatment such as quenching, tempering, or stress relief annealing.
In the above embodiments, the present disclosure has been described taking two power-on modes as an example. However, the present disclosure is not limited thereto. The present disclosure may perform energization heating in only one energization mode or in an energization mode selected from three or more energization modes.
In the above embodiment, the operator selects the energization mode. However, the invention of the present disclosure is not limited thereto. In the present disclosure, the heating apparatus 1 may automatically determine the shape, size, and the like of the workpiece W, and the heating apparatus 1 may automatically select the energization mode to perform energization heating.
In the above embodiment, the workpiece W is heated by energization heating. However, the present disclosure is not limited thereto. The present disclosure may be, for example: a focusing furnace for heating the workpiece W by induction heating, flame heating, and condensing light with a mirror, a fluidized bed furnace for fluidizing heated solid particles and heating the workpiece W by contact of the solid particles with the workpiece W, a heater for blowing heated gas to the workpiece W, and a heater using infrared rays, plasma, saltpeter, or superheated steam.
In the above embodiment, the warning unit 33 is provided, and the warning unit 33 issues a warning when the time difference between the elapsed time from the start of heating to the completion of applying the heating energy E and the previously stored elapsed time is greater than the previously stored time. However, the present disclosure is not limited thereto. The present disclosure may be configured not to use the warning unit 33, or configured to issue a warning when an elapsed time from the start of heating exceeds a previously stored elapsed time.
The present disclosure is not limited to the embodiments described above, as long as it matches the gist of the invention described in the claims. For example, at least two of the plurality of embodiments may be combined, or any of the constituent elements shown in the embodiments may not be used.
Claims (7)
1. A heating apparatus for a workpiece that heats a workpiece made of metal, the heating apparatus characterized by comprising:
a heater for heating the workpiece,
a temperature detector that detects a temperature of the workpiece before being heated by the heater,
a heating energy calculating section that calculates heating energy required for raising the temperature of the workpiece to the heating temperature by the heater based on a temperature difference between the temperature detected by the temperature detector and a target heating temperature, and
a control section that controls the heater to apply the heating energy calculated by the heating energy calculation section to the workpiece;
the heater is an electric heater for heating the workpiece by applying an electric current to the workpiece,
the control section has a storage section that stores an energization pattern indicating a relationship between an elapsed time from the start of energization and a current value,
the control unit changes the current value according to the elapsed time from the start of energization to realize the energization pattern stored in advance in the storage unit,
the control unit cuts off the current without gradually decreasing the current value from the maximum current supply state when a difference between a maximum path cross-sectional area and a minimum path cross-sectional area in a current supply path of the current to the workpiece is smaller than a predetermined value, and cuts off the current after gradually decreasing the current value from the maximum current supply state when a difference between the maximum path cross-sectional area and the minimum path cross-sectional area in the current supply path of the current to the workpiece is greater than or equal to the predetermined value.
2. The apparatus for heating a workpiece according to claim 1,
the storage section is capable of storing a plurality of the energization patterns,
has a selection unit operated by an operator for selecting one of the plurality of energization modes for heating,
the control unit heats the workpiece in the energization mode selected by the selection unit.
3. The apparatus for heating a workpiece according to claim 1 or 2,
the temperature detector is a non-contact thermometer that detects temperature based on temperature energy thermally radiated from the workpiece.
4. The heating apparatus for a workpiece according to claim 1 or 2,
the heating apparatus includes a warning unit that issues a warning when a time difference between an elapsed time from when heating is started to when application of the heating energy is completed and a pre-stored elapsed time is greater than a pre-stored time.
5. The apparatus for heating a workpiece according to claim 3,
the heating apparatus includes a warning unit that issues a warning when a time difference between an elapsed time from a start of heating to a completion of applying the heating energy and a previously stored elapsed time is greater than a previously stored time.
6. A method of heating a workpiece made of metal, the method being characterized by comprising:
a heating step of heating the workpiece by a heater,
a temperature detecting step of detecting a temperature of the workpiece before heating by the heating step, an
A heating energy calculation step of calculating heating energy required to raise the temperature of the workpiece to the heating temperature, based on a temperature difference between the temperature detected in the temperature detection step and the target heating temperature;
controlling the heater to apply the heating energy calculated by the heating energy calculation step to the workpiece,
the heater is an electric heater for heating the workpiece by applying an electric current to the workpiece,
when the relationship between the elapsed time from the start of energization and the current value is referred to as an energization pattern, the current value is changed to realize an energization pattern predetermined in accordance with the shape of the workpiece,
the method includes the steps of cutting off the current flow without gradually decreasing the current value from the maximum current flow state when a difference between a maximum path cross-sectional area and a minimum path cross-sectional area in a current flow path of the current to the workpiece is smaller than a predetermined value, and cutting off the current flow after gradually decreasing the current value from the maximum current flow state when a difference between the maximum path cross-sectional area and the minimum path cross-sectional area in the current flow path of the current to the workpiece is greater than or equal to the predetermined value.
7. The heating method according to claim 6,
in the temperature detecting step, a temperature is detected using a non-contact thermometer that detects a temperature from temperature energy thermally radiated from the workpiece.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018137780A JP7111543B2 (en) | 2018-07-23 | 2018-07-23 | Heating device and heating method |
| JP2018-137780 | 2018-07-23 | ||
| PCT/JP2019/027590 WO2020022093A1 (en) | 2018-07-23 | 2019-07-11 | Heating device and heating method |
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| CN111742612A CN111742612A (en) | 2020-10-02 |
| CN111742612B true CN111742612B (en) | 2022-05-31 |
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| CN201980014041.7A Active CN111742612B (en) | 2018-07-23 | 2019-07-11 | Heating device and heating method |
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| JP (1) | JP7111543B2 (en) |
| CN (1) | CN111742612B (en) |
| WO (1) | WO2020022093A1 (en) |
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| CN103460792A (en) * | 2011-01-28 | 2013-12-18 | 韦巴斯托股份公司 | Electrical heater, vehicle comprising electrical heater and method for controlling electrical heater |
| CN103129433A (en) * | 2011-11-30 | 2013-06-05 | 丰田纺织株式会社 | Heater control unit and vehicle seat heater |
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| CN111742612A (en) | 2020-10-02 |
| JP7111543B2 (en) | 2022-08-02 |
| WO2020022093A1 (en) | 2020-01-30 |
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