Heating control method, heating control device, thermoforming method and thermoforming device

Abstract

A heating control method for heating an object to be heated by means of a plurality of heaters that generate radiative heat and control the temperature of the object to be heated to a temperature within a desired target temperature distribution, the plurality of heaters being disposed in each of a plurality of heating regions obtained by dividing the object to be heated. The supply energy to each of the plurality of heaters, that is, the distribution of the supply energy set for each heater in order to heat the body to be heated to a temperature within the target temperature distribution, is obtained, and the plurality of heaters generate radiation heat corresponding to the distribution of the supply energy to heat the body to be heated. A difference between the measured temperature distribution and the target temperature distribution is calculated for each heating region, a correction amount of supplied energy is calculated for each heater on the basis of the difference, and a correction energy distribution in which the supplied energy is corrected by the correction amount is calculated for each heater. The plurality of heaters generate radiation heat corresponding to the correction energy distribution to heat the heated body.

Description

Technical Field

[0001] The present invention relates to a heating control method, a heating control device, a molding method, and a molding device. Background Art

[0002] Due to the digitization of the glass molding process in recent years, the realization of multi-variety high-speed molding is expected. In glass molding, it is known that the viscosity that changes according to the glass temperature affects the quality of the molded product. In order to achieve stable glass molding, it is necessary to accurately control the glass temperature and its temperature distribution.

[0003] In conventional glass molding machines, continuous production is performed with the output of the heater and the heating set temperature being constant, and production is carried out in an environment where the glass molded product is stabilized. However, it takes time for the glass molding machine to reach a stable state, and there are also environmental changes caused by external air temperature and the like, which affect the productivity and quality of the molded product.

[0004] In addition, in the case of glass molding, even if the output of the heater is set to be constant, the temperature of the glass plate is different in the cold state just after heating in the furnace of the glass molding machine and the hot state during continuous molding, resulting in different temperature distributions. Thus, in glass molding where the viscosity changes according to the temperature, the temperature error has a great influence on the molding quality.

[0005] The above situation is not limited to glass, and the same applies to other materials such as steel materials. Accurate control of the heating temperature becomes an issue. For example, a temperature management method for steel plates is described in Patent Document 1. In this temperature management method, a plurality of divided regions are formed in a heat treatment furnace in which steel plates are loaded, and a form factor and an emissivity are set for each divided region. Thus, in the case of calculating the temperature of the steel plate using a one-dimensional heat conduction equation, the influence of the deviation of the form factor and the emissivity in the heat treatment furnace is suppressed. In this case, the relationship between the heated body and the heater in the radiant heating region is established using the form factor, and the output of the heater is obtained by inverse calculation using the least squares method. In addition, a method of controlling the temperature by formulating the relationship between the heated body and the heater in the radiant heating region is described in Patent Document 2.

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2014-196534

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 2004-63670

[0008] However, in the temperature management method of Patent Document 1, the temperature distribution is not controlled, and the steel plate is only taken out of the heat treatment furnace when the preset heat treatment temperature is reached. In addition, the shape factor is used when obtaining the relationship between the furnace ambient temperature and the steel plate temperature based on the thermocouples installed in the furnace and the thermocouples installed in the test steel plate, and the shape factor is not input again when estimating and calculating the steel plate temperature based on the furnace ambient temperature. That is, it is premised that the conditions during the test and actual measurement do not change.

[0009] In the temperature control of Patent Document 2, temperature measurement is only performed at one location, and the temperature distribution is not measured. In addition, the control device of Patent Document 2 has a plurality of heaters, but does not control the temperature distribution by controlling each heater individually.

[0010] In addition, PID control is mostly used in general temperature control, but in the radiative heating area using the radiant heat from the heater, there are cases where it is affected by interference in the normal PID control and the optimal temperature control cannot be performed.

[0011] Thus, in the case of radiatively heating the object to be heated by the heat generation of a plurality of heaters, in order to make the object to be heated have an ideal temperature distribution, there are still many problems in appropriately setting the output of each heater, which is the actual situation. Summary of the Invention

[0012] Therefore, an object of the present invention is to provide a heating control method, a heating control device, a molding method, and a molding device that can always stably heat the temperature within a set temperature distribution even when the initial temperatures and surrounding environments of the object to be heated, the molding device, etc. are different when heating the object to be heated by the radiant heat from a plurality of heaters.

[0013] The present invention is composed of the following structure.

[0014] (1) A heating control method for heating an object to be heated by a plurality of heaters that generate radiant heat, and controlling the temperature of the object to be heated to a temperature within a desired target temperature distribution, wherein,

[0015] The plurality of heaters are arranged in each of a plurality of heating regions obtained by dividing the object to be heated,

[0016] Find the supply energy respectively given to the plurality of heaters, that is, the distribution of the supply energy set for each heater to heat the object to be heated to a temperature within the target temperature distribution,

[0017] Cause the plurality of heaters to generate radiant heat corresponding to the distribution of the supply energy to heat the object to be heated,

[0018] The temperature of a plurality of positions of the heated object after heating is measured to obtain a measured temperature distribution.

[0019] For each of the heating regions, the difference between the measured temperature distribution and the target temperature distribution is calculated.

[0020] Based on the difference, a correction amount of the supply energy is calculated for each of the heaters.

[0021] For each of the heaters, a corrected energy distribution is obtained by correcting the supply energy with the correction amount.

[0022] The plurality of heaters generate radiant heat corresponding to the corrected energy distribution to heat the heated object.

[0023] (2) A thermoforming method, wherein a movable member is pressed against the heated object heated by the heating control method of (1) to form a molded object having a desired shape.

[0024] (3) A heating control device that heats a heated object by radiant heat and controls the temperature of the heated object to a temperature within a desired target temperature distribution, comprising:

[0025] A plurality of heaters, each of which is arranged in each of a plurality of heating regions obtained by dividing the heated object and generates radiant heat;

[0026] A supply energy calculation unit that obtains the supply energy respectively given to the plurality of heaters, that is, the distribution of the supply energy set for each of the heaters in order to heat the heated object to a temperature within the target temperature distribution;

[0027] A heater driving unit that causes the plurality of heaters to generate radiant heat corresponding to the distribution of the supply energy to heat the heated object;

[0028] A temperature measurement unit that measures the temperature of a plurality of positions of the heated object and outputs information on the measured temperature distribution;

[0029] A difference calculation unit that calculates the difference between the measured temperature distribution and the target temperature distribution for each of the heating regions;

[0030] A correction amount calculation unit that calculates a correction amount of the supply energy for each of the heaters based on the difference; and

[0031] A corrected energy calculation unit that obtains a corrected energy distribution obtained by correcting the supply energy with the correction amount for each of the heaters.

[0032] The heater driving unit causes the plurality of heaters to generate radiant heat corresponding to the corrected energy distribution, thereby heating the object to be heated.

[0033] (4) A thermoforming apparatus, comprising:

[0034] (3) The heating control device that heats the object to be heated to a forming temperature; and

[0035] A forming unit that presses a movable member against the object to be heated heated by the heating control device to form the object to be heated.

[0036] Advantages of the Invention

[0037] According to the present invention, when heating an object to be heated by radiant heat from a plurality of heaters, even when the initial temperatures of the object to be heated, the forming apparatus, etc. and the surrounding environment are different, it is possible to always stably heat to a temperature within a set temperature distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of a thermoforming apparatus including a heating control device.

[0039] Figure 2 is a partially enlarged cross-sectional view schematically showing the manner in which a heater heats a glass plate and the manner in which a temperature sensor measures the temperature of the glass plate.

[0040] Figure 3 is a schematic diagram showing an arrangement example of heaters and temperature sensors.

[0041] Figure 4 is a schematic diagram showing another arrangement example of heaters and temperature sensors.

[0042] Figure 5 is a schematic explanatory diagram showing the forming operation of a forming unit on a glass plate.

[0043] Figure 6 is a process explanatory diagram showing a schematic temperature history of a glass forming process.

[0044] Figure 7 is a schematic functional block diagram of the heating control of a heating control device.

[0045] Figure 8 is a flowchart showing the process of the first heating control of a heating control device.

[0046] Figure 9 is an explanatory diagram schematically showing a one-dimensional thermal simulation model.

[0047] Figure 10Examples of set outputs of multiple heaters obtained through iterative calculations, which represent Figure 3 An explanatory diagram showing the set outputs of the heaters arranged linearly as shown.

[0048] Figure 11 Examples of set outputs of multiple heaters obtained through iterative calculations, which represent Figure 4 An explanatory diagram showing the set outputs arranged in a two-dimensional (N rows and M columns) pattern as shown.

[0049] Figure 12 An explanatory diagram showing an example of the heater output distribution of multiple heaters.

[0050] Figure 13 A graph showing the changes in the target temperature distribution of the glass plate and the optimized calculated temperature distribution based on the number of iterative calculations.

[0051] Figure 14 A graph showing an example of controlling the temperature distribution of the glass plate within a V-shaped temperature distribution through first heating control.

[0052] Figure 15 A graph showing an example of controlling the temperature distribution of the glass plate within an S-shaped temperature distribution through first heating control.

[0053] Figure 16 A graph showing the relationship between the process time and the temperature of the glass plate when starting the first heating control in the middle of heating for two glass plates with different initial temperatures.

[0054] Figure 17 A flowchart showing the process of the second heating control of the heating control device.

[0055] Figure 18 A conceptual diagram of PID control and feedback control in the second heating control.

[0056] Figure 19 A graph showing an example of controlling the temperature distribution of the glass plate to a V-shaped temperature distribution through the second heating control.

[0057] Figure 20 A graph showing an example of controlling the temperature distribution of the glass plate to an S-shaped temperature distribution through the second heating control.

[0058] Figure 21 A schematic structural diagram of a thermoforming device equipped with a heating control device. Detailed implementation mode

[0059] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the heating control method of the present invention, a plurality of heaters that generate radiant heat corresponding to the supplied energy are used to heat the object to be heated to a temperature within a desired temperature distribution. Here, a heating and forming method in which a glass plate is bent and formed into a desired shape by a forming unit equipped with a heating control device will be described as an example, but the object to be heated is not limited to a glass plate and may be other components or other shapes.

[0060] <Heating Control Device and Forming Device>

[0061] Figure 1 It is a schematic structural diagram of a heating and forming device 300 equipped with a heating control device 100. The heating and forming device 300 includes a heating control device 100 and a forming unit 200. The heating control device 100 for heating a glass plate G as the object to be heated includes a plurality of heaters 11, a plurality of temperature sensors 13, a heater driving unit 17 that individually drives the plurality of heaters 11, and a control unit 19. The heating control device 100 performs heating control on the glass plate G placed on the forming unit 200 described later so as to be within a temperature distribution suitable for its forming shape. In addition, although not shown in the figure, the heating control device 100 may also include a mechanism that moves up and down in cooperation with the operation of the forming unit 200 to avoid mutual collision.

[0062] (Configuration of Heating Control Device)

[0063] Figure 2 It is a partially enlarged cross-sectional view schematically showing the state in which the heater 11 heats the glass plate G and the state in which the temperature sensor 13 measures the temperature of the glass plate G. The heater 11 generates radiant heat corresponding to the input supplied energy to heat the glass plate G as the object to be heated. The temperature sensor 13 is disposed on the side opposite to the heater 11 side of the heat insulating plate 15 and measures the temperature of the heated glass plate G.

[0064] A plurality of heaters 11 are arranged opposite to the glass plate G and mainly heat specific heating regions (exemplified as A1 and A2 in Figure 2 of the glass plate G that are different from each other) by radiant heat. Each heating region may overlap with each other or may be an independent region. That is, each heater 11 may be correspondingly arranged in the heating regions divided into a plurality of parts of the glass plate G, or may be arranged at an arbitrary position. In the present heating control device 100, it is particularly effective when the heating regions of the plurality of heaters 11 overlap, and the relationship between the heater 11 and the heating measurement object, and the heater 11 and the heating control object is not a one-to-one relationship.

[0065] In addition, it is preferred that each heater 11 is arranged at an equal distance from the glass plate G and at equal intervals from each other within a range corresponding to the size of the glass plate G. As the heater 11, for example, various electric heaters such as tubular or block heaters such as sheath heaters, carbon heaters, and ceramic heaters, or surface heaters such as rubber heaters and foil heaters can be used, and heat is generated according to the magnitude of the supplied energy (current, voltage) given. The heater 11 is not limited to the above-mentioned electric heaters, and other forms may be used as long as it can heat the heated object.

[0066] The temperature sensor 13 measures the temperature of the glass plate G from the gap between the arranged heaters 11. The temperature sensor 13 is preferably a non-contact sensor that can measure the temperature of the glass plate G without contact, for example, an infrared sensor can be used. The infrared sensor can stably measure a wide range of temperatures with high-speed responsiveness. By making the temperature sensor 13 non-contact, it is unnecessary to wire cables, etc., and the temperature measurement can be performed simply without complicating the mechanism. In addition, the temperature measurement position and direction can be freely adjusted, so the spacing of the measurement points can be easily changed and adjusted according to the purpose of the shape, size, required measurement resolution, etc. of the glass plate G. In addition, for example, the position and direction of the temperature sensor 13 can be adjusted according to the shape of the glass plate G so that it can be measured from a direction perpendicular to the plate surface of the glass plate G. Thereby, the accuracy of temperature measurement can be improved.

[0067] In addition, an air cooling device, a reflection plate, a heat insulating plate, etc. may be placed between the temperature sensor 13 and the glass plate G.

[0068] The heaters 11 are preferably arranged in a one-dimensional or two-dimensional matrix so as to face the above-mentioned heating area. Figure 3 It is a schematic diagram showing an example of arrangement of the heater 11 and the temperature sensor 13 . Figure 3 The heater 11 shown is a linear tube heater arranged in parallel to each other. A plurality of temperature sensors 13 are arranged in a grid shape along the length direction and arrangement direction of the heater 11, and the temperature of the glass plate G is measured from the gaps between the heaters 11. When a linear heater 11 is used, the glass plate G can be heated uniformly along the length direction of the heater 11, and the deviation of the temperature distribution can be suppressed. In addition, when a tube heater is used, any one of the plurality of temperature sensors 13 arranged along the tube heater can be used as a representative to measure the temperature. In addition, a pair of heater groups consisting of a plurality of rows of tube heaters arranged in parallel to each other can be prepared, and the height positions of the respective heater groups are different, and the longitudinal directions of the tube heaters are arranged crosswise to generate a two-dimensional temperature distribution.

[0069] Figure 4 1 is a schematic diagram showing another configuration example of the heater 11 and the temperature sensor 13.Figure 4 As shown, the heater 11 may also be a surface heater disposed opposite to each heating region. In this case, by arranging the surface heaters in a two-dimensional matrix, it is possible to extremely finely control the two-dimensional temperature distribution. Thereby, it is possible to measure the temperature and temperature distribution of each heating region where the glass plate G is arranged in one dimension or two dimensions. In addition, the temperature sensor 13 only needs to be able to measure the temperature distribution of the glass plate G, regardless of its method or type. For example, the temperature of multiple positions of the glass plate G may be extracted from the image information at once by thermal imaging.

[0070] The control unit 19 is configured as a computer including a processor such as a CPU, a ROM (Read Only Memory), a RAM (Random Access Memory), an HDD (Hard Disk Drive), an SSD (Solid State Drive), and other storage devices. In this case, Figure 1 the functions of the respective parts shown can be realized by the processor executing a prescribed program stored in the storage device.

[0071] (Configuration of the molding device)

[0072] The molding unit 200 causes a plurality of pins 21, which are movable parts, to project and press against the glass plate G heated to the molding temperature by the heating control device 100, and molds it into a desired shape. The plurality of pins 21 are supported by a pin support portion 23 in such a manner that their axial directions are aligned. The glass plate G is placed on the upper end portion 21a of the pin 21, and the lower end portion 21b of the pin 21 is pushed upward by the mold body 27 of the lifting table 25. The upper surface 27a of the mold body 27 has the designed shape of the glass plate G to be molded, and the plurality of pins 21 project according to the designed shape, thereby molding the glass plate G into the desired shape. In addition, a heat insulating sheet may be placed between the upper end portion 21a of the pin 21 and the glass plate G.

[0073] Figure 5 is a schematic explanatory diagram showing the molding operation of the molding unit 200 on the glass plate G. The molding unit 200 drives the lifting table 25 to rise by an instruction from the Figure 1 control unit 19 shown. The mold body 27 pushes the pin 21 upward, and the designed shape of the upper surface 27a of the mold body 27 is reproduced by the upper end portion 21a of the pin 21. By pushing the glass plate G upward by the upper end portion 21a of the pin 21, the glass plate G is molded into the designed shape. According to this configuration, a mold is not required, and it is possible to easily perform molding of an arbitrary shape.

[0074] The configuration of the above-mentioned forming unit 200 is an example, and it can also be other configurations. For example, the above-mentioned mold body 27 can also be a mold formed by planing, cutting, printing, a structure composed of pins, etc. In addition, for example, the forming unit 200 can also directly press the Figure 21 shown mold body 27 onto the glass plate G heated to the forming temperature by the heating control device 100 to form the desired shape. In addition, it is also possible to use the mold body 27 as the lower mold and at least one other mold body as the upper mold to press the glass plate G heated to the forming temperature for stamping. Also, depending on the purpose, it is possible to combine and implement vacuum forming of the glass plate G based on vacuum adsorption on the forming surface of the mold body 27 and pressure forming of the glass plate G based on pressure welding on the forming surface of the mold body 27.

[0075] <Forming process of glass plate>

[0076] Figure 6 is a process explanatory diagram showing a schematic temperature history of the glass forming process. The glass forming process includes a heating process (t 0 ~t 1 ), a forming process (t 1 ~t 2 ), a slow cooling process (t 2 ~t 3 ), and a cooling process (t 3 ~t 4 ). Tf is the forming temperature, and Ts is the strain point of the glass. Especially in the forming process, the viscosity distribution of the glass plate based on heating affects the forming quality, so it is necessary to make the temperature distribution of the glass plate as close as possible to the set temperature distribution. For example, the temperature is increased at the part with a large bending curvature compared to the part with a small curvature to reduce the viscosity and improve the formability. In addition, the temperature is decreased at the part with a small bending curvature compared to the part with a large curvature to increase the viscosity, making it difficult for the shape to sag and suppressing the generation of transfer marks on the glass plate.

[0077] The temperature distribution of the glass plate when moving to the forming process, that is, the target temperature distribution of the glass plate in the heating process, can be set based on the result (ideal temperature distribution) of obtaining the optimal glass temperature distribution through forming simulation. The closer the actual temperature distribution of the glass plate is to the ideal temperature distribution, the more accurately and efficiently the ideal glass forming can be performed.

[0078] However, the temperature distribution of the glass plate reaching after the heating process is as Figure 6As shown by the multiple dashed curves in the heating process, due to various factors such as the physical properties of the glass plate, the forming shape, and the ambient temperature, it is not ideal. Therefore, in this heating control device 100, the temperature distribution of the glass plate during the heating process is measured, and based on the measurement results, a simple thermal simulation is sequentially performed to optimize the control of the heater output. In this way, the deviation of the glass temperature distribution caused by the above factors is eliminated through the optimal control of the heater output during the heating process.

[0079] Figure 7 FIG. is a schematic functional block diagram of the heating control of the heating control device 100. This heating control includes the following components and processes. A plurality of heaters 11 are arranged in a plurality of heating regions obtained by dividing the glass plate G, and each generates radiant heat. The target temperature distribution (ideal temperature distribution) of the glass plate G is input to the control unit 19. The supply energy calculation unit 19A calculates the supply energy (heater output) respectively given to the plurality of heaters 11, that is, the distribution of the supply energy (heater output distribution) set for each heater 11 in order to heat the glass plate G to the temperature within the target temperature distribution.

[0080] The heater driving unit 17 causes radiant heat corresponding to the distribution of the supply energy to be generated from the plurality of heaters 11 to heat the glass plate G. Figure 1 The temperature measurement unit 14 including a plurality of temperature sensors 13 shown in FIG. measures the temperatures at a plurality of positions of the glass plate G, and outputs the information of the measured temperature distribution to the control unit 19. The difference calculation unit 19B calculates the difference between the input measured temperature distribution and the target temperature distribution for each heating region. The correction amount calculation unit 19C calculates the correction amount of the supply energy for each heater 11 based on the difference calculated by the difference calculation unit 19B. The corrected energy calculation unit 19D obtains the corrected energy distribution after correcting the supply energy with the correction amount for each heater 11, and outputs the information of the corrected energy distribution to the heater driving unit 17. The heater driving unit 17 causes the plurality of heaters 11 to generate radiant heat corresponding to the corrected energy distribution to heat the glass plate G.

[0081] <First Heating Control>

[0082] Next, a specific example of the above heating control, that is, the process of the first heating control, will be described.

[0083] Figure 8 FIG. is a flowchart showing the process of the first heating control of the heating control device 100. In the first heating control, first, the above ideal temperature distribution is obtained through three-dimensional forming simulation of the glass plate G (S11). In this forming simulation, the optimal temperature distribution when the glass plate is bent and formed is obtained through thermal deformation analysis using a three-dimensional model.

[0084] Next, the heater output of each heater 11 is set with the ideal temperature distribution obtained by molding simulation as the target temperature distribution, and each heater 11 is heated. At the same time, the temperature distribution of the heated glass plate G is measured by a plurality of temperature sensors 13 (S12).

[0085] Moreover, based on the information of the temperature distribution of the glass plate G measured after heating, the arrival temperature distribution of the glass plate G in the case of continuously heating with the set heater output distribution is predicted (S13). The prediction of the arrival temperature distribution here can reduce the computational burden, for example, by performing a simple analysis using a one-dimensional heat simulation model.

[0086] Figure 9 FIG. is a schematic explanatory diagram showing a one-dimensional heat simulation model. In this heat simulation model, it is shown that the radiant heat from a plurality of heaters 11 is transferred to the glass plate G supported by the upper parts of the pins of the plurality of pins 21 shown, the input heat transferred conducts heat within the glass plate G, and is exhausted to the pins 21 supporting the glass plate G. According to this model, knowing the measured temperature distribution of the glass plate G and the radiant heat from each heater 11, the change in the temperature distribution caused by heating the glass plate G can be predicted. The model shown here is a simple model configuration, but the heat simulation is appropriately redesigned according to various conditions such as the configuration of the heating device and the change of the heating object. Figure 1 Next, it is determined whether the predicted arrival temperature distribution is within the allowable error from the predetermined target temperature distribution (S14). When the predicted arrival temperature distribution is within the allowable error, the current heater output distribution is updated as it is (S15). On the other hand, when the predicted arrival temperature distribution exceeds the allowable error, the heater output distribution is obtained by inverse calculation based on the difference between the arrival temperature distribution and the target temperature distribution and the form factor (S16).

[0087] In this inverse calculation, based on the temperature distribution of the glass plate G corrected to be within the allowable error, the heater output distribution for achieving this temperature distribution is calculated. Here, the process of the specific inverse calculation will be described. If the temperature of the glass plate is formulated by a one-dimensional integral formula, it can be expressed by Equation (1).

[0088]

Formula 1

[0089]

Formula 1

[0090]

[0091] T glass : Temperature of the glass plate [K]

[0092] t: Time [s]

[0093] ρ: Density of the glass plate [kg / m3

[0094] C p : Specific heat of the glass plate [J / kgK]

[0095] k: Thermal conductivity of the glass plate [W / mK]

[0096] V: Volume of the glass plate [m 3

[0097] S: Area of the glass plate [m 2

[0098] x: Coordinate of the glass plate [m]

[0099] W heater : Heat flux per unit time of the radiant heat from the heater (input heat) [W / m 2

[0100] W others : Other heat flux per unit time (heat rejection) [W / m 2

[0101] The left side of Equation (1) is the change per unit time of the total heat possessed by the glass plate G, the first term on the right side is the amount of heat diffusively transferred per unit time in the glass plate G by heat conduction, and the second term on the right side is the sum of the input heat from the heater to the heat per unit time of others. Since the processing calculation amount for obtaining the heater output distribution from Equation (1) is huge, the equation is deformed as follows.

[0102] On the right side of Equation (1), the first term is called the diffusion term and exhibits the effect of blunting (smoothing) the temperature distribution by heat conduction. Therefore, it is the second term that actively forms the temperature distribution. When the heater output is changed, the temperature distribution changes according to the change of the second term, and then, through the first term, a phenomenon of blunting its temperature distribution occurs. In addition, the W of the second term on the right side out also produces a passive phenomenon of a change in the radiative cooling amount caused by diffuse reflection according to the change in the glass temperature based on the change in the heater output. If we focus on the phenomenon before the temperature distribution is blunted, the change in the glass temperature with respect to the change in the heat flux from the heater can be approximated by Equation (2) obtained by deforming Equation (1).

[0103]

Equation 2

[0104]

[0105] If Equation (2) is rearranged, Equation (3) is obtained, and the change in the glass temperature can be approximated as being proportional to the change in the heat flux from the heater.

[0106]

Equation 3

[0107]

[0108] At this time, dW in represents the direct radiation component from the heater, and the heat flux can be approximated as in Equation (4) using the form factor and the change in the heater output.

[0109]

Equation 4

[0110]

[0111] Substitute Equation (4) into Equation (3), and Equation (5) is derived by introducing the calculation coefficient α.

[0112]

Equation 5

[0113]

[0114] Equation (5) can calculate the optimal solution by the least squares method, and the distribution of the heater output dI to be changed can be obtained by inverse calculation based on the difference dT between the current temperature distribution and the target temperature distribution.

[0115] VF: Form factor from the heater to the glass plate

[0116] dI: Correction amount of the heater output distribution

[0117] α: Calculation coefficient

[0118] In addition, the subscript i represents the coordinates on the glass plate, and the subscript j represents the heater number (a total of n heaters).

[0119] That is, by the least squares method, the correction amount dI that minimizes the error of the simultaneous linear equations prepared with the coordinate quantities on each glass plate in Equation (5) is derived. In this way, since the glass temperature change model for the change in the heater output is modeled by a very simple approximate formula, real-time temperature control can be achieved. In addition, in order to derive the correction amount dI by the least squares method, it is preferable that the number of coordinate points i (temperature evaluation points) on the glass plate is more than the number of controlled heaters j, and the temperature of non-measured coordinates can also be inferred by interpolation as needed.

[0120] The form factor VF is a coefficient representing the geometric positional relationship between the two in the heat transfer from the heater 11 to the glass plate G, and represents the ratio of the radiant energy emitted from one surface that reaches the other surface by the geometric shapes of the two surfaces. If the configuration of the thermoforming apparatus 300 and the positional relationship of the glass plate G are determined, this form factor is uniquely determined. Specifically, the form factor is obtained for each heating region and represents the geometric positional relationship between the heater 11 and the heating region. In this thermoforming apparatus 300, the form factor is calculated and the above-described heater output distribution is set. Therefore, even if the positional relationship between the heater 11 and the glass plate G changes during the heating process, the form factor is recalculated based on this change, and an influence on the heater output can be avoided. In particular, in the heating control apparatus 100 having this configuration, the plurality of heaters 11 are arranged at a prescribed constant distance apart in the normal direction of the glass plate G and are arranged parallel to the plate surface of the glass plate G, etc., and the positional relationship between the heater 11 and the glass plate G is simplified. Therefore, the form factor can be calculated using a simple theoretical formula, and even if the geometric positional relationship between the heater 11 and the glass plate G changes, complex heat calculations are not required, and it is possible to cope only by recalculating the form factor. As a result, the correction amount of the heater output distribution can be obtained in real time and accurately. In addition, the calculation coefficient α is a coefficient for adjusting an arbitrary output when inversely calculating the heater output distribution dI to be changed based on the difference dT between the current temperature distribution and the target temperature distribution. For example, it can be a constant value. In addition, for example, the calculation coefficient α can also be adjusted so as to perform PID control on the heater output distribution dI based on the difference dT. Thereby, it is possible to quickly converge to the target temperature. In addition, the calculation coefficient α can also be adjusted according to the purpose during the heating process.

[0121] Figure 10 , Figure 11 is an explanatory diagram showing an example of the set outputs of the plurality of heaters 11 obtained by the above-described iterative calculation. The heater outputs of the plurality of heaters 11 (HT1 to HTn) are obtained based on the correction amount of the heater output distribution obtained by the above-described iterative calculation and are set individually for each heater 11. Figure 10 is Figure 3 an example of the set output arranged one-dimensionally as shown, Figure 11 is Figure 4 an example of the set output of the heaters 11 arranged two-dimensionally (N rows and M columns) as shown. The illustrated set output is specifically control parameters such as the current value and voltage value input to each heater 11. By setting the heater output individually for each heater 11, the temperature distribution of the glass plate G can be finely controlled.

[0122] Figure 12It is an explanatory diagram showing an example of the heater output distribution of a plurality of heaters 11. The distribution of the heater output is not limited to a distribution that is constant or smoothly continuous along the arrangement direction of the heaters 11. It is possible to set with a high degree of freedom the heating distribution in which there are relatively large continuously heated areas, such as the heater numbers 1 to 5 and 34 to 37 shown as Figure 12 , the heating distribution in which there are discretely heated areas, such as the heater numbers 6 to 33, and the output distributions of the plurality of heaters 11, such as a heating distribution in which both of the above-mentioned areas are mixed. In addition, when solving the above formula (5), the least squares method with constraints is used, and arbitrary constraints, such as upper and lower limits of the heater output, can be set for the derived heater output. In this way, through the optimization by iterative calculation based on formula (5), the temperature of the glass plate G can be made into a heating distribution that can approximate the target temperature distribution with higher accuracy. In addition, by setting the number of points (i) of the temperature distribution of the glass plate G to be larger than the number of heaters 11, the optimal solution can be calculated.

[0123] Figure 13 It is a graph showing the change of the target temperature distribution of the glass plate G and the optimized calculation temperature distribution based on the number of iterative calculations. The gap between the optimized calculation temperature distribution and the target temperature distribution in the first iterative calculation is large, but it approaches the target temperature distribution as the number of iterative calculations increases.

[0124] Refer again to Figure 8 , and set the heater output distribution for approaching the target temperature distribution obtained as described above as the heater output (S17) for thermal simulation input. Then, through S13, thermal simulation is performed again using the set heater output to predict the arrival temperature distribution (S13). The processes of S16 and S17 described above are repeated until the arrival temperature distribution is within the allowable error from the target temperature distribution (S14). If it is within the allowable error, the heater output distribution is updated to the heater output value for each heater 11 (S15). Then, the processes of S12 to S17 described above are repeated until the heating process ends (S18).

[0125] As described above, in the first heating control, when heating the glass plate G to target an ideal temperature distribution through a heating process, thermal simulation is performed based on the measured temperature distribution measured by a plurality of temperature sensors 13 to predict the arrival temperature distribution under this condition. In such a way that the predicted arrival temperature distribution becomes the target temperature distribution, the heater output distribution is obtained through inverse calculation. Moreover, the arrival temperature distribution when the glass plate G is heated with the obtained heater output distribution is predicted through thermal simulation. If the predicted arrival temperature distribution is within the allowable error from the target temperature distribution, the heater output distribution is updated as the output value of each heater 11. Through the feedforward control repeatedly performed in this heating process, the arrival temperature of the glass plate G at the end of the heating process can be made close to the ideal temperature distribution. As a result, in the subsequent forming process, a temperature distribution suitable for forming the glass plate G is obtained, and the glass plate G can be formed well.

[0126] Generally speaking, controlling the temperature distribution at multiple positions to a desired heating distribution through a plurality of heaters 11 requires cumbersome control, and it is difficult to control with good responsiveness and high precision. However, according to this heating control, the heater output of each of the plurality of heaters is individually adjusted through thermal simulation during heating, so that it is possible to heat to draw the best temperature rise curve. In addition, in this configuration, the temperature distribution of the glass plate G is directly measured from the gaps between the heaters 11, so the temperature distribution can be obtained with higher precision than indirect measurement such as converting the temperature value of other measurement parameters or other parts into the temperature value of the glass plate G. Therefore, thermal simulation and feedforward control can be performed with high precision, and a more appropriate heater output distribution can be set.

[0127] Moreover, according to this heating control, the glass temperature can be controlled quickly and stably, and the forming conditions can be determined quickly. Therefore, even when producing a large number of varieties continuously, it is easy to instantaneously determine appropriate forming conditions, and the productivity of glass forming can be improved.

[0128] Figure 14 It is a diagram showing an example of controlling the temperature distribution of the glass plate G to a temperature within a V-shaped temperature distribution through the first heating control. Figure 15 It is a diagram showing an example of controlling the temperature distribution of the glass plate G to a temperature within an S-shaped temperature distribution through the first heating control. The target temperature distribution here is set in the range of 350°C to 450°C below the strain point of the glass plate G for easy confirmation of temperature controllability. The horizontal axis of each diagram is the coordinate in the length direction of the glass plate G, and the vertical axis is the temperature. As Figure 14 、 Figure 15 shown, according to the first heating control, a temperature distribution close to the target temperature distributions of V-shaped and S-shaped is obtained.

[0129] Figure 16 This is a graph showing the relationship between the process time and the temperature of the glass plate G in the case where the first heating control is started midway through the heating for two glass plates G with different initial temperatures. The glass plate G in Example 1 with an initial temperature of room temperature T1 and the glass plate G in Example 2 with an initial temperature of T2 higher than room temperature are heated, and the first heating control is started from the moment ta when they each reach a substantially equilibrium state. As a result, in both Example 1 and Example 2, the target temperature Tt is reached and a balanced state is achieved within a short time just after the start of the first heating control. Thus, by using the feedforward control of the thermal simulation model of the first heating control, highly robust heating control can be achieved regardless of the initial temperature of the glass and the molding device and the surrounding environment.

[0130] <Second Heating Control>

[0131] Figure 17 This is a flowchart showing the process of the second heating control of the heating control device 100. In the second heating control, first, the ideal temperature distribution is obtained by three-dimensional molding simulation of the glass plate G (S21). In this molding simulation, the optimal temperature distribution when the glass plate is bent and molded is obtained by thermal deformation analysis using a three-dimensional model.

[0132] Next, taking the ideal temperature distribution obtained by the molding simulation as the target temperature distribution, the heater output of each of the plurality of heaters 11 is set, and each heater 11 is heated. At the same time, the temperature distribution of the heated glass plate G is measured by the temperature sensor 13 (S22). The processes of S21 and S22 described above are the same as the processes of S11 and S12 of the first heating control.

[0133] Moreover, the difference between the measured temperature distribution of the measured glass plate G and the ideal temperature distribution is obtained, and the heater output distribution is inversely calculated based on the obtained difference and the shape factor (S23). The process of the inverse calculation is the same as S16 in the above-mentioned first heating control ( Figure 8 ). That is, the heater output distribution for making the measured temperature distribution into the ideal temperature distribution is calculated.

[0134] Next, based on the information of the obtained heater output distribution, the heater output is set by PID control (S24). Moreover, this heater output is updated to the heater output value for each heater 11 (S25). The processes of S22 to S25 described above are repeated until the heating process ends (S26).

[0135] Figure 18It is a conceptual diagram of PID control and feedback control in the second heating control. The heater output is PID-controlled based on the difference between the ideal temperature distribution and the measured temperature distribution measured by the temperature sensor. The temperature distribution of the glass plate G after this PID control is measured, and the information on the obtained temperature distribution is fed back to the calculation of the next heater output distribution. Through such feedback control, it is possible to quickly converge to the target temperature.

[0136] In this heating control, the ideal temperature distribution is set as the target temperature distribution, but an intermediate target temperature distribution can also be set in the middle of the heating process to approach the ideal temperature distribution in stages. In this case, the glass plate G can be heated to the temperature within the ideal temperature distribution at the temperature and history within the intentional heating distribution corresponding to the shape, characteristics, etc. of the glass plate G, and the design freedom can be improved.

[0137] Figure 19 It is a diagram showing an example in which the temperature distribution of the glass plate G is controlled to a V-shaped temperature distribution by the second heating control. Figure 20 It is a diagram showing an example in which the temperature distribution of the glass plate G is controlled to an S-shaped temperature distribution by the second heating control. The target temperature distribution is set in the range of 350°C to 450°C respectively. The horizontal axis of each diagram is the coordinate in the length direction of the glass plate G, and the vertical axis is the temperature. As Figure 19 、 Figure 20 shown, according to the second heating control, a temperature distribution closer to the V-shaped and S-shaped target temperature distributions can be obtained more accurately than in the case of the first heating control.

[0138] <Improvement effect in the molding process>

[0139] According to the first heating control and the second heating control described above, it is possible to shorten the time to the set heating conditions and obtain the effect of suppressing the shape deviation of the molded product. In the past, in the preliminary preparation before molding, the heating conditions were set based on calculations and tests, and then a molding test was carried out to verify the set heating conditions. On the other hand, in this heating control, the ideal temperature distribution is obtained by optimization calculation, a molding test is carried out based on this ideal temperature distribution, the deviation from the ideal temperature distribution is obtained in the molding test, and the heater output distribution is updated by inverse calculation. Therefore, it is possible to reduce unnecessary man-hours and efficiently set the heating conditions. In addition, since an ideal temperature distribution is obtained, it is possible to suppress the deviation of the molded product and perform high-quality molding.

[0140] The present invention is not limited to the above-described embodiments. Combinations of the components of the embodiments, changes and applications made by those skilled in the art based on the description of the specification and well-known technologies are also within the scope of the present invention and are included in the scope of claims.

[0141] As described above, the following matters are disclosed in this specification.

[0142] (1) A heating control method for heating an object to be heated by a plurality of heaters that generate radiant heat, and controlling the temperature of the object to be heated to a temperature within a desired target temperature distribution, wherein

[0143] the plurality of heaters are arranged in each of a plurality of heating regions obtained by dividing the object to be heated,

[0144] find the distribution of supply energies respectively given to the plurality of heaters, that is, the distribution of supply energies set for each heater to heat the object to be heated to a temperature within the target temperature distribution,

[0145] cause the plurality of heaters to generate radiant heat corresponding to the distribution of the supply energies to heat the object to be heated,

[0146] measure the temperatures at a plurality of positions of the heated object to be heated to obtain a measured temperature distribution,

[0147] calculate the difference between the measured temperature distribution and the target temperature distribution for each of the heating regions,

[0148] calculate a correction amount for the supply energy for each of the heaters based on the difference,

[0149] find a corrected energy distribution obtained by correcting the supply energy with the correction amount for each of the heaters,

[0150] cause the plurality of heaters to generate radiant heat corresponding to the corrected energy distribution to heat the object to be heated.

[0151] According to this heating control method, by generating radiant heat corresponding to a corrected energy distribution corrected based on the difference between the measured temperature distribution and the target temperature distribution of the object to be heated from a plurality of heaters, it is possible to efficiently control the temperature distribution of the object to be heated to the target temperature distribution regardless of the initial temperature of the object to be heated, the molding device, etc., and the surrounding environment.

[0152] (2) The heating control method according to (1), wherein

[0153] calculate the correction amount based on the difference obtained for each of the heating regions and a form factor indicating the geometric positional relationship between the heater and the heating region.

[0154] According to this heating control method, since the correction amount is obtained using a form factor corresponding to the geometric positional relationship between the heater and the heated region, it is possible to set the corrected energy more accurately and accurately control the temperature distribution of the object to be heated.

[0155] (3) According to the heating control method described in (2), wherein,

[0156] Solve a system of linear equations including the difference and the shape coefficient for each coordinate on the object to be heated.

[0157] Obtain a correction amount that minimizes the error of the system of linear equations by the least squares method.

[0158] Based on the obtained correction amount, calculate the corrected energy of each of the plurality of heaters.

[0159] According to this heating control method, by simply obtaining a correction amount that minimizes the error of the system of linear equations by the least squares method, temperature control can be easily performed in real time.

[0160] (4) According to the heating control method described in (3), wherein,

[0161] Obtain the correction amount by iterative calculation in such a way that the mean square error is minimized.

[0162] According to this heating control method, the correction amount can be set with higher precision through iterative calculation.

[0163] (5) According to any one of (1) to (4) of the heating control methods, wherein,

[0164] Predict the temperature distribution of the object to be heated when the object to be heated is heated by the plurality of heaters based on the corrected energy distribution through thermal simulation.

[0165] Repeatedly calculate the correction amount until the predicted temperature distribution becomes within the allowable error with respect to the target temperature distribution.

[0166] According to this heating control method, by repeatedly performing feedforward control to make the predicted temperature distribution predicted by thermal simulation approach the target temperature distribution, the correction amount can be calculated with high precision.

[0167] (6) According to the heating control method described in (1), wherein,

[0168] Perform PID control on the plurality of heaters based on the correction amount, and feed back information on the measured temperature distribution obtained by measuring the temperature distribution of the object to be heated after the PID control to the next calculation of the correction amount.

[0169] According to this heating control method, the temperature distribution of the object to be heated can be quickly converged to the target temperature through PID control and feedback control.

[0170] (7) The heating control method according to (6), wherein,

[0171] After performing at least once the operation of setting the target temperature distribution to an intermediate temperature distribution in the middle of the process of setting the target temperature distribution to a predetermined final arrival temperature distribution of the heated body and heating the heated body to a temperature within the intermediate temperature distribution,

[0172] The target temperature distribution is set to the final arrival temperature distribution to heat the heated body.

[0173] According to this heating control method, by setting the target temperature distribution of the heated body in multiple stages, it is possible to heat with an intentional heating distribution and history corresponding to the shape, characteristics, etc. of the heated body.

[0174] (8) The heating control method according to any one of (1) to (7), wherein,

[0175] The heated body is glass.

[0176] According to this heating control method, it is possible to easily change the viscosity distribution of the glass.

[0177] (9) A heat forming method, wherein,

[0178] A movable member is pressed against the heated body heated by the heating control method according to any one of (1) to (7) to form a molded body having a desired shape.

[0179] According to this heat forming method, it is possible to make the heated body have a desired temperature distribution with high precision.

[0180] (10) The heat forming method according to (9), wherein,

[0181] The heated body is glass.

[0182] According to this heat forming method, it is possible to make the glass have a viscosity distribution suitable for forming and improve the formability.

[0183] (11) A heating control device that heats a heated body by radiant heat and controls the temperature of the heated body to a temperature within a desired target temperature distribution, and includes:

[0184] A plurality of heaters, each of which is arranged in each of a plurality of heating regions obtained by dividing the heated body and generates radiant heat;

[0185] A supply energy calculation unit that obtains the supply energy respectively given to the plurality of heaters, that is, the distribution of the supply energy set for each heater in order to heat the heated body to a temperature within the target temperature distribution;

[0186] A heater driving unit that causes the plurality of heaters to generate radiant heat corresponding to the distribution of the supplied energy to heat the object to be heated;

[0187] A temperature measuring unit that measures the temperatures at a plurality of positions of the object to be heated and outputs information on the measured temperature distribution;

[0188] A difference calculation unit that calculates the difference between the measured temperature distribution and the target temperature distribution for each of the heating regions;

[0189] A correction amount calculation unit that calculates a correction amount of the supplied energy for each of the heaters based on the difference; and

[0190] A corrected energy calculation unit that obtains a corrected energy distribution in which the supplied energy is corrected by the correction amount for each of the heaters,

[0191] The heater driving unit causes the plurality of heaters to generate radiant heat corresponding to the corrected energy distribution to heat the object to be heated.

[0192] According to this heating control device, by generating radiant heat corresponding to a corrected energy distribution corrected based on the difference between the measured temperature distribution and the target temperature distribution of the object to be heated from a plurality of heaters, it is possible to efficiently control the temperature distribution of the object to be heated to the target temperature distribution regardless of the initial temperature of the object to be heated, the molding device, etc. and the surrounding environment.

[0193] (12) The heating control device according to (11), wherein

[0194] The temperature measuring unit is a non-contact temperature sensor.

[0195] According to this heating control device, it is possible to simply measure the temperature of the object to be heated without providing a complicated mechanism. In addition, it is possible to easily change and adjust the measurement positions of the object to be heated.

[0196] (13) The heating control device according to (12), wherein

[0197] The temperature sensor is an infrared sensor.

[0198] According to this heating control device, it is possible to measure a wide range of temperatures with high speed response and stability.

[0199] (14) The heating control device according to (12) or (13), wherein

[0200] The temperature sensors are arranged opposite to the plurality of heating regions in a one-dimensional or two-dimensional matrix.

[0201] According to this heating control device, it is possible to measure the temperature distribution along a one-dimensional or two-dimensional matrix.

[0202] (15) The heating control device according to any one of (11) to (14), wherein

[0203] the heater is a linear tube heater.

[0204] According to this heating control device, it is possible to uniformly heat the object to be heated along the length direction of the linear tube heater, and it is possible to suppress the deviation of the temperature distribution.

[0205] (16) The heating control device according to any one of (11) to (14), wherein

[0206] the heater is a surface heater arranged corresponding to each of the heating regions.

[0207] According to this heating control device, it is possible to control the temperature distribution by heating region.

[0208] (17) A thermoforming device, comprising:

[0209] (11) to (16) The heating control device according to any one of them, which heats the object to be heated to the forming temperature; and

[0210] a forming part that presses a movable part against the object to be heated heated by the heating control device to form the object to be heated.

[0211] According to this thermoforming device, by forming the object to be heated heated to a temperature within a desired temperature distribution by the forming part, it is possible to form the object to be heated in a state suitable for forming.

[0212] The present invention has been described in detail with reference to specific embodiments, but it is obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. This application is based on a Japanese patent application (Japanese Patent Application No. 2023-201939) filed on November 29, 2023, the content of which is incorporated herein by reference.

[0213] Explanation of reference numerals

[0214] 11… Heater; 13… Temperature sensor; 14… Temperature measurement unit; 15a… Measurement window; 17… Heater drive unit; 19… Control unit; 19A… Supply energy calculation unit; 19B… Difference calculation unit; 19C… Correction amount calculation unit; 19D… Corrected energy calculation unit; 21… Pin; 21a… Upper end portion; 21b… Lower end portion; 23… Pin support portion; 25… Lifting worktable; 27… Die body; 27a… Upper surface; 29… Actuator; 29a… Movable portion; 100… Heating control device; 200… Molding unit; 300… Heat molding device; G… Glass plate (heated object).

Claims

1. A heating control method, wherein a heated object is heated by a plurality of heaters that generate radiant heat, and the temperature of the heated object is controlled to a temperature within a desired target temperature distribution, wherein: The plurality of heaters are arranged in each of the plurality of heating regions formed by dividing the heated object. obtaining the supply energy to be given to each of the plurality of heaters, that is, the distribution of the supply energy set for each of the heaters in order to heat the heated object to a temperature within the target temperature distribution; causing the plurality of heaters to generate radiant heat corresponding to the distribution of the supplied energy to heat the heated object, measuring the temperatures of a plurality of locations of the heated object after heating to obtain a measured temperature distribution, calculating the difference between the measured temperature distribution and the target temperature distribution for each of the heating regions, calculating a correction amount of the supplied energy for each of the heaters based on the difference, for each of the heaters, obtaining a corrected energy distribution after correcting the supplied energy by the correction amount, The plurality of heaters are caused to generate radiant heat corresponding to the corrected energy distribution to heat the heated object.

2. The heating control method according to claim 1, characterized in that: The correction amount is calculated based on the difference value obtained for each of the heating regions and a form coefficient indicating a geometric positional relationship between the heater and the heating region.

3. The heating control method according to claim 2, characterized in that: A simultaneous linear equation including the difference and the shape coefficient is obtained for each coordinate on the heated object, The correction amount that minimizes the error of the simultaneous linear equations is obtained by the least squares method. The correction energy of each of the plurality of heaters is calculated based on the obtained correction amount.

4. The heating control method according to claim 3, characterized in that: The correction amount is obtained through multiple iterative calculations in such a way that the square mean error is minimized.

5. The heating control method according to claim 1, characterized in that: predicting, by thermal simulation, a temperature distribution of the object to be heated when the object to be heated is heated by the plurality of heaters based on the corrected energy distribution; The calculation of the correction amount is repeatedly performed until the predicted arrival temperature distribution becomes equal to or smaller than an allowable error with respect to the target temperature distribution.

6. The heating control method according to claim 1, characterized in that: The plurality of heaters are PID-controlled based on the correction amount, and information on a measured temperature distribution obtained by measuring a temperature distribution of the heated object after the PID control is fed back to calculation of the correction amount next time.

7. The heating control method according to claim 6, characterized in that: After the target temperature profile is set to an intermediate temperature profile on the way to a predetermined final temperature profile of the heated object and the heated object is heated to a temperature within the intermediate temperature profile at least once, The target temperature distribution is set as the final temperature distribution to heat the object to be heated.

8. The heating control method according to any one of claims 1 to 7, characterized in that: The heated object is glass.

9. A heating forming method, characterized in that: A movable member is pressed against the heated object heated by the heating control method according to any one of claims 1 to 7, thereby molding a molded object into a desired shape.

10. The heating forming method according to claim 9, characterized in that: The heated object is glass.

11. A heating control device for heating a heated object by radiant heat and controlling the temperature of the heated object to a temperature within a desired target temperature distribution, characterized in that: have: A plurality of heaters are arranged in each of a plurality of heating regions obtained by dividing the heated object, and generate radiant heat; a supply energy calculation unit for calculating supply energy to be respectively applied to the plurality of heaters, that is, a distribution of supply energy set for each of the heaters in order to heat the heated object to a temperature within the target temperature distribution; a heater driving unit configured to cause the plurality of heaters to generate radiant heat corresponding to the distribution of the supplied energy to heat the heated object; a temperature measuring unit that measures the temperatures of a plurality of locations of the heated body and outputs information on the measured temperature distribution; a difference calculation unit that calculates a difference between the measured temperature distribution and the target temperature distribution for each of the heating regions; a correction amount calculation unit that calculates a correction amount of the supplied energy for each of the heaters based on the difference; as well as a correction energy calculation unit for obtaining, for each of the heaters, a correction energy distribution obtained by correcting the supplied energy by the correction amount; The heater driving unit causes the plurality of heaters to generate radiant heat corresponding to the corrected energy distribution to heat the heated object.

12. The heating control device according to claim 11, characterized in that: The temperature measuring unit is a non-contact temperature sensor.

13. The heating control device according to claim 12, characterized in that: The temperature sensor is an infrared sensor.

14. The heating control device according to claim 12, characterized in that: The temperature sensors are arranged in a one-dimensional or two-dimensional matrix to face the plurality of heating regions.

15. The heating control device according to claim 11, characterized in that: The heater is a linear tube heater.

16. The heating control device according to claim 11, characterized in that: The heater is a surface heater arranged corresponding to each of the heating regions.

17. A heating forming device, characterized in that: include: The heating control device according to any one of claims 11 to 16, which heats the heated body to a molding temperature; as well as The molding section presses a movable member against the heated object heated by the heating control device to mold the heated object.

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