JP2021187078A - Control method for sheet heating and forming machine - Google Patents

Abstract

To provide a control method for sheet heating and forming machine that can efficiently produce sheet formed products without interfering with the production of sheet formed products, even when the sheet winding rolls need to be replaced during the production of sheet formed products.SOLUTION: The control method of the heating and forming machine 10 is to heat the sheet 92 supplied from the sheet winding roll 91, and to manufacture semi-formed products 93, which are formed from the sheet 92 by the mold, one after another continuously by repeating the heating and forming process, with the control unit 2, and to manufacture the semi-formed products 93 under a steady state of operation. If the time per heating and forming process to manufacture semi-formed products 93 is defined as the first tact time T1, and the time that is longer than the first tact time T1 by an adjustment time ΔT is defined as the second tact time T2, then while manufacturing semi-formed products 93 in the first tact time T1, the control unit 2 will change the tact time T2 to the second tact time T2 instead of the first tact time T1 when the sheet winding roll 91 is replaced. The control unit 2 changes the tact time to the second tact time T2 and continues the heat forming process.SELECTED DRAWING: Figure 10

Description

The present invention relates to a control method for a sheet heat molding apparatus that heats and molds a sheet in manufacturing a sheet molded product.

Among the resin products, there are sheet molded products. Sheet molded products are manufactured using a sheet heat forming device and a sheet trimming device. In the heat forming step, the sheet heat forming apparatus heats a long sheet intermittently supplied from a sheet winding roll under automatic operation, and a part of the inside of the sheet surface is removed by a mold. Semi-molded products in the molded state are continuously manufactured one after another. The trimming step is in the next step of the heat forming step, and the sheet trimming apparatus is installed in-line with the sheet heating forming apparatus. The sheet trimming device takes out the main part of the molded product, which will be the product later, from the semi-molded product sent from the sheet heat molding device. Perform trimming.

In a production line for mass-producing such sheet molded products, the end portion of the stretched sheet is next to the pre-replacement sheet winding roll that has been used before the wound sheet is used up. It is connected to the starting end of the sheet wound on the replaced sheet winding roll to be used, and the sheet is supplied from the sheet winding roll without interruption. In particular, when manufacturing sheet molded products under a mass production system, the tact time of the heat molding process in the steady production mode is only a few seconds, so the sheets are connected before and after the replacement of the sheet winding roll during operation. When performing the matching work, the worker has little time to spare. Therefore, as in Patent Document 1, there may be a case where the heat forming step has to be temporarily stopped while the sheet winding roll is being replaced.

Patent Document 1 is a feed control method for a resin sheet with a printed pattern, in which a newly supplied resin sheet is accurately fed to a set position of a molding apparatus by a transport device when the resin sheet is replaced. In the technique of Patent Document 1, the resin sheet to be molded by the molding apparatus is delivered by the transport device from the end portion of the sheet winding roll before replacement to the start end portion of the sheet winding roll after replacement. Is stopped.

Japanese Patent No. 11-228002

However, if the sheet winding roll is replaced while the heat forming process is continued in the tact time of the steady production mode, the burden on the operator is increased due to the reason that sufficient time cannot be secured. In addition, if the replacement work time is not sufficient, for some reason, the sheet end of the sheet winding roll before replacement and the sheet start end of the sheet winding roll after replacement can be connected in an appropriate state. There is a risk that it will not exist. If the sheets are improperly connected to each other, for example, defective products may occur, and the sheet of the sheet winding roll after replacement may not be properly set in the transport section in the sheet heat forming apparatus. The connected sheets are separated from each other due to the delivery operation of the transport unit, which adversely affects the production of the sheet molded product.

On the other hand, as in Patent Document 1, if the heat molding process is temporarily stopped while the sheet winding roll is being replaced, the process capacity of the production line is reduced and the productivity of the sheet molded product is reduced. Due to the decrease, it becomes impossible to efficiently manufacture the sheet molded product.

Further, after the sheet of the sheet winding roll before replacement is used up and the execution of the heat forming step is stopped, the sheet of the sheet winding roll after replacement to be used next is set in the sheet heat forming apparatus. , The operation of the sheet heat forming apparatus is restarted. At this time, for a while immediately after the start of operation, the heating temperature of the sheet and the semi-molded product obtained by molding a part of the inside of the sheet surface after heating are not in a stable state in terms of quality control. Therefore, in order to stabilize the heating temperature of the sheet and the state of the semi-molded product, the sheet heat-molding device performs large-scale heat-molding control as an initial production mode close to the state at the beginning of production of the sheet-molded product. However, it is necessary to heat and mold a new sheet after the roll is replaced. As a result, if such an initial production mode is repeatedly performed in the heat molding process, the productivity of the sheet molded product is further reduced.

The present invention has been made to solve the above problems, and even if it is necessary to replace the sheet winding roll during the production of the sheet molded product, the production of the sheet molded product is hindered. It is an object of the present invention to provide a control method of a sheet heat molding apparatus capable of efficiently producing a sheet molded product without coming.

In order to achieve the above object, the control method of the sheet heat molding apparatus according to the present invention has the following configurations.
(1) Sheet heating molding in which a sheet supplied from a sheet winding roll is heated, and a sheet molded product on which the sheet is molded by a mold is continuously manufactured one after another by repeating the heat molding step. In the control method of the apparatus, the time per one heat molding step of manufacturing the sheet molded product under a steady operation state with a control unit is set as a first takt time T1 (0 <T1). Assuming that the time longer than the first tact time T1 by the adjustment time ΔT (0 <ΔT) is the second tact time T2 (T1 <T2), the sheet molded product is being manufactured at the first tact time T1. Along with the replacement work of the winding roll, the control unit is characterized in that the first tact time T1 is replaced with the second tact time T2 and the heat forming step is continued.
(2) In the control method of the sheet heat molding apparatus according to (1), the sheet is provided with a heater for heating the sheet, and the control unit follows the change from the first tact time T1 to the second tact time T2. It is characterized in that the temperature of the heater is controlled.
(3) In the control method of the sheet heating molding apparatus according to (1) or (2), the sheet molded product is provided by using the sheet winding roll provided in advance with a heater for heating the sheet. In the situation where the production is started, in carrying out the heat forming step once, the control unit starts the operation at the third tact time T3 (T1 <T3), which is longer than the first tact time T1, and then the above. The time of one heat forming step is changed until the first tact time T1, and the temperature of the heater is controlled by following the change from the third tact time T3 to the first tact time T1. It is characterized by that.
(4) In the control method of the sheet heat forming apparatus according to (2) or (3), a temperature measuring means for measuring the heating temperature of the sheet is provided, and the control unit heats the sheet heated by the heater. It is characterized in that the temperature of the heater is controlled based on the measured temperature of the sheet by the temperature measuring means so that the temperature can be adjusted to a temperature within a set allowable range.
(5) In the control method of the sheet heat forming apparatus according to (4), the control unit is changing from the first tact time T1 to the second tact time T2, or from the third tact time T3. While changing to the first takt time T1, the heating temperature of the sheet is adjusted based on the updated temperature of the heater while adjusting the temperature of the heater stepwise.
(6) In the control method of the sheet heat molding apparatus according to (4) or (5), the control unit is characterized in that the temperature of the heater is adjusted by feedback control based on the measured temperature of the sheet. And.

The operation and effect of the control method of the sheet heat molding apparatus according to the present invention having the above configuration will be described.
(1) Sheet heating molding in which a sheet supplied from a sheet winding roll is heated, and a sheet molded product on which the sheet is molded by a mold is continuously manufactured one after another by repeating the heat molding step. In the control method of the device, the time per one heat molding step of manufacturing a sheet molded product under a steady operation state with a control unit is set as the first takt time T1 (0 <T1), and the first takt. Assuming that the time longer than the time T1 by the adjustment time ΔT (0 <ΔT) is the second tact time T2 (T1 <T2), the sheet winding product is being manufactured at the first tact time T1 and the sheet winding roll is replaced. Along with this, the control unit is characterized in that the heat forming step is continued by changing to the second tact time T2 instead of the first tact time T1.

Due to this feature, the operator can sufficiently secure the required working time without stopping the operation of the sheet winding roll when replacing the sheet winding roll during the operation of the sheet heating molding apparatus according to the present invention, and the sheet winding can be sufficiently secured. The rolls can be replaced. Therefore, the decrease in productivity of the sheet molded product due to the replacement work of the sheet winding roll is suppressed, and the process capability of the sheet heat molding apparatus according to the present invention can be maintained higher, so that the sheet molded product can be efficiently produced. Can be manufactured.

Therefore, according to the control method of the sheet heat molding apparatus according to the present invention, even if the sheet winding roll needs to be replaced during the production of the sheet molded product, the production of the sheet molded product is hindered. It has an excellent effect that a sheet molded product can be efficiently manufactured without any trouble.

In the control method of the sheet heat molding apparatus described in (2), a heater for heating the sheet is provided, and the control unit follows the change from the first tact time T1 to the second tact time T2 to control the temperature of the heater. It is characterized by controlling.

Due to this feature, the production mode can be changed from the first tact time T1 to the second tact time T2 in the steady production mode, and the occurrence of heat defects of the sheet can be suppressed in manufacturing the sheet molded product. Therefore, it becomes possible to manufacture a sheet molded product with a higher yield.

In the control method of the sheet heat forming apparatus described in (3), in a situation where a heater for heating a sheet is provided and a sheet winding product is started to be manufactured using a pre-installed sheet winding roll, the heat forming step is performed. In one implementation, the control unit has a third tact time T3 (T1 <T3), which is longer than the first tact time T1. It is characterized in that the temperature of the heater is controlled by changing the time of the third tact time T3 and following the change from the third tact time T1 to the first tact time T1.

Due to this feature, it is possible to suppress the occurrence of heating defects due to the heater for the sheet in manufacturing the sheet molded product from the start of operation until the steady production mode is reached. Therefore, even if the heated sheet is molded by a mold, a sheet molded product in a stable state can be obtained in terms of quality control, and by extension, the yield can be further increased to manufacture the sheet molded product. become.

In the control method of the sheet heat forming apparatus described in (4), a temperature measuring means for measuring the heating temperature of the sheet is provided, and the control unit sets the heating temperature of the sheet heated by the heater to a temperature within a set allowable range. It is characterized in that the temperature of the heater is controlled based on the measured temperature of the sheet by the temperature measuring means so that the temperature can be adjusted.

Due to this feature, even if the heating state of the sheet by the heater differs depending on the characteristics such as the material and properties of the sheet, the temperature of the heater can be easily adjusted to the heating temperature of the sheet to be heated regardless of the characteristics of the sheet to be heated. Can be adjusted to.

In the control method of the sheet heat forming apparatus according to (5), the control unit changes from the first tact time T1 to the second tact time T2, or from the third tact time T3 to the first tact time T1. It is characterized in that the heating temperature of the sheet is adjusted based on the updated temperature of the heater while adjusting the temperature of the heater step by step.

Due to this feature, even while changing from the first tact time T1 to the second tact time T2 or changing from the third tact time T3 to the first tact time T1, it is a defective product in manufacturing a sheet molded product. The sheet molded product is good in terms of quality control under more optimal heat molding conditions such as the heating temperature and heating time of the sheet by the heater, the time of the heating formation interval for forming the sheet after heating, etc. It can be manufactured with high molding accuracy.

In the control method of the sheet heat molding apparatus described in (6), the control unit is characterized in that the temperature of the heater is adjusted by feedback control based on the actual measurement temperature of the sheet.

This feature facilitates heating of the sheet at a temperature adjusted to a set desired temperature.

It is a schematic diagram schematically showing the structure of the sheet molding system which concerns on embodiment. It is a block diagram which shows the structure of the feedback control which adjusts the temperature of a heater group in the control part of the heat molding apparatus which concerns on embodiment. It is a figure which shows the state that the heat molding process is carried out using the sheet supplied from the sheet winding roll before replacement used earlier in the sheet roll mounting part of the heat molding apparatus which concerns on embodiment. be. Continuing from FIG. 3, it is a figure which shows the state which the sheet end portion approached with respect to the sheet winding roll before replacement. Continuing from FIG. 4, it is a figure which shows the state which stored all the sheet remaining part completely separated from the core part of the sheet winding roll before replacement in a stock zone. Continuing from FIG. 5, the figure shows a state in which the sheet start end portion of the sheet winding roll after replacement, which has been waiting on the sheet roll mounting portion, is connected to the sheet end portion of the sheet winding roll before replacement with tape. be. It is a figure which shows the time chart per cycle of a heat molding process in the heat molding apparatus which concerns on embodiment. It is a chart which shows the relationship between the tact time and the production mode in the heat molding process by the heat molding apparatus which concerns on embodiment, and is the time chart figure when the production start of a semi-molded article is included in the accelerated production mode. It is a chart which shows the relationship between the tact time and the production mode in the heat molding process by the heat molding apparatus which concerns on embodiment, and is the time chart figure in the case which includes two kinds of steady production modes which have different tact times. It is a flowchart which shows the flow of control with the delivery of a semi-molded article. It is a flowchart which shows the flow of control with heating in the heat molding process by the heat molding apparatus which concerns on embodiment. It is a graph which shows the relationship between the measured temperature of a heated sheet and the temperature of the heater group to control about the heat molding apparatus which concerns on embodiment, and feedback control | control | control of the temperature of a heater group based on the measured temperature of a heated sheet. It is explanatory drawing which shows the state of doing.

Hereinafter, embodiments that embody the control method of the sheet heat molding apparatus according to the present invention will be described in detail with reference to the drawings. The sheet heat-molding apparatus according to the present invention is an apparatus for continuously producing sheet-molded products one after another by repeating the heat-molding process. In the heat molding step, after heating the sheet supplied from the sheet winding roll, this sheet is molded with a mold to obtain a sheet molded product. In the present embodiment, a case where the sheet heat forming apparatus is installed together with the sheet trimming apparatus by forming a sheet forming system will be described.

First, an outline of the sheet forming system will be described with reference to FIG. FIG. 1 is a schematic view schematically showing a configuration of a sheet molding system according to an embodiment. In FIG. 1, the left side in the left-right direction is the upstream side in the transmission direction HZ, the right side is the downstream side in the transmission direction HZ, and the vertical direction is the vertical VT. Further, the direction perpendicular to the paper surface of FIG. 1 is defined as the width direction WD, and each direction is defined. The directions of each figure after FIG. 3 also follow this definition.

As shown in FIG. 1, the sheet molding system 1 is a production facility for manufacturing a sheet molded product, and the heat molding device 10 (sheet heat molding device) which is responsible for the heat molding process is placed in-line with the trimming device 20. It is arranged in. The heat forming apparatus 10 includes a control unit 2 and can be operated by automatic operation by the control unit 2. In the present embodiment, the control unit 2 is the entire sheet forming system 1 including the trimming device 20 and the like. Takes charge of electrical control.

The heat forming apparatus 10 heats a long sheet 92 intermittently supplied from the sheet winding roll 91, and a semi-molded product 93 in a state where a part of the inside of the sheet 92 surface is formed by a mold. (Corresponding to the sheet molded product of the present invention) is manufactured. In the trimming step, which is the next step, the trimming device 20 trims the sheet-free portion 94 around the molded product main part of the semi-molded product 93 to obtain the product 90 which is the molded product main part. The product 90 is, for example, a sheet-molded product such as a container such as a container for food, a case such as an inner box of a home electric appliance, an operation panel, and the like, which are used in daily life.

The forming method of the sheet 92 performed in the heat forming step is, for example, a vacuum forming method, a differential pressure forming method such as a pressure air forming method or a pressure air vacuum forming method, a press forming method, or the like. The sheet 92 is, for example, a general thermoplastic resin sheet such as polyethylene (PE: polyethylene) or polypropylene (PP: polypropylene), and has a single-layer structure or a laminated structure in which other sheet materials are laminated. It is a sheet having various layer structures. Further, in the present embodiment, the thickness of the sheet 92 is mainly about 200 to 1000 μm, but the sheet thickness may be outside the range of 200 to 1000 μm.

The JIS (Japanese Industrial Standards) packaging terminology stipulates that a thin plate-shaped plastic material with a thickness of 250 μm or more is used as a sheet, and a film-shaped plastic material with a thickness of less than 250 μm is used as a film. However, in the present embodiment, the plastic material thermoformed by the sheet forming system 1 is not distinguished by the thickness thereof, and even the plastic material having a thickness in the category of the film is generically referred to as a sheet.

The heat molding apparatus 10 has a sheet supply unit 10A and a heat forming unit 10B. In the sheet supply unit 10A, the long sheet 92 is intermittently supplied to the heat forming unit 10B by the transport unit 11 in a posture of being horizontally stretched from the sheet winding roll 91. As shown in FIG. 1, on the heating side 10Ba of the heat forming portion 10B, both sides of the sheet 92 are heated by the heater group 13 (heater) arranged so as to face the vertical VT. The temperature of the heated sheet 92 is measured by a radiation thermometer 15 (temperature measuring means) provided in the vicinity of the heater group 13. As will be described later, the control unit 2 adjusts the temperature of the heater group 13 by feedback control based on the measured temperature of the sheet 92.

FIG. 2 is a block diagram showing a configuration of feedback control for adjusting the temperature of the heater group in the control unit of the heat molding apparatus according to the embodiment. The control unit 2 includes a drive control unit that controls the operation of the transport unit 11, the molding die, the transport unit 21 of the trimming device 20, and the like, as well as a central control circuit that controls the operation of the entire sheet molding system 1. , And the input I / O of the sensor to be connected. The central control circuit is a circuit in which a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), timer circuit, non-volatile memory, etc. are electrically connected to the internal bus and wired. be. The CPU is based on a control program recorded in ROM or non-volatile memory. While using the RAM as a work area, each part such as the heat molding unit 10B of the heat forming apparatus 10 and the trimming portion 20A of the trimming apparatus 20 is electrically controlled. Further, as shown in FIG. 2, the control unit 2 includes a PLC (programmable logic controller) 3, a solid state relay (SSR) 4, an operation unit 5, an external storage unit 6, an information output unit 7, and the like. have.

The transport unit 11 is interlocked with the heat treatment control of the sheet 92 by the heater group 13 by the control unit 2, and at the same time, the sheet 92 before the heat treatment is delivered to the downstream side in the delivery direction HZ by an intermittent operation for each treatment. Under interlocking with the molding process control of the sheet 92 by the mold, the semi-molded product 93 after the molding process is delivered to the downstream side of the delivery direction HZ by an intermittent operation for each process. On the molding side 10Bb following the heating side 10Ba, a part of the in-plane of the heated sheet 92 is molded as a semi-molded product 93 by a mold (not shown). The semi-molded product 93 is continuously manufactured one after another.

After being discharged from the heat molding device 10, the semi-molded product 93 passes through a buffer zone SP provided between the heat molding device 10 and the trimming device 20, and is transferred to the trimming section 20A by the transport section 21 in the trimming device 20. It will be carried in. The trimming portion 20A separates the main part of the molded product, which will be the product 90 later, from the unnecessary part (sheet unnecessary portion 94) by the cutting operation based on the periodic motion with respect to the supplied semi-molded product 93. The sheet unnecessary portion 94 is sent to the scrap collecting section 20B on the downstream side of the sending direction HZ, and is wound up by the scrap collecting section 20B. Further, at the same time as the sheet unnecessary portion 94 is sent out, the individual products 90 removed from the semi-molded product 93 are carried out to the product mounting section 20C by the transport section 21, and are intermittently mounted on the product mounting section 20C. Will be placed.

In the sheet forming system 1 according to the present embodiment, the trimming device 20 is not particularly limited as long as it is configured with specifications that can cooperate with the heat forming device 10 regardless of whether it is an existing device or a new device. Further, the heat forming apparatus 10 may be arranged separately from the trimming apparatus, in addition to being installed in-line with the trimming apparatus. Further, even when the molding target product such as the product 90 manufactures a sheet molding product that does not require a trimming step only in the heat molding step, the heat molding step by the sheet heat molding apparatus according to the present invention is carried out as described later. The control method of the heat molding apparatus 10 according to the embodiment can be applied.

Next, the procedure for replacing the sheet winding roll 91 during the operation of the sheet forming system 1 will be described with reference to FIGS. 3 to 6. FIG. 3 shows a sheet roll mounting portion of the heat molding apparatus according to the embodiment, in which a heat molding step is performed using a sheet supplied from the sheet winding roll before replacement used earlier. It is a figure which shows. FIG. 4 is a diagram showing a state in which the sheet end portion is closer to the sheet winding roll before replacement, following FIG. FIG. 5 is a diagram showing a state in which the entire remaining sheet portion completely separated from the core portion of the sheet winding roll before replacement is stored in the stock zone, following FIG. 4. FIG. 6 shows a state in which, following FIG. 5, the sheet start end portion of the replaced sheet winding roll, which has been waiting on the sheet roll mounting portion, is connected to the sheet end portion of the sheet winding roll before replacement with tape. It is a figure which shows.

In the sheet supply unit 10A of the heat forming apparatus 10, as shown in FIG. 3, a plurality of sheet winding rolls 91 (two in FIG. 3 and the like illustrated) moor the core portion on the sheet roll pedestal 12. It is placed. During the manufacturing of the semi-molded product 93, the sheet 92 supplied to the sheet supply unit 10A continues to be sent out from the previous sheet winding roll 91a (91), and the next sheet winding roll 91b (91) is the previous sheet winding roll 91b (91). It is waiting after the roll 91a. As shown in FIG. 4, when the remaining amount of the sheet 92 wound by the previous sheet winding roll 91a is low, the operator replaces the sheet winding roll 91.

In the replacement work of the sheet winding roll 91, first, as shown in FIG. 5, the rest of the sheet 92 is released from the core portion of the sheet winding roll 91a. Next, the operator leaves the end portion 92E of the sheet 92 on the sheet roll pedestal 12 side, and the sheet remaining portion 92R, which is the majority of the rest of the sheet 92, is between the heat forming portion 10B of the heat forming apparatus 10. Store in the stock zone SZ in. Next, as shown in FIG. 6, the operator moves the waiting sheet winding roll 91b on the sheet roll stand 12, and the start end portion of the sheet 92 wound around the sheet winding roll 91b. The 92S and the end portion 92E of the sheet 92 of the sheet winding roll 91a are butted against each other, and both sheets 92 are connected to each other with tape or the like. Thus, the sheets 92, 92 of the sheet winding rolls 91 (91a, 91b) before and after the replacement are connected to each other, and the production of the semi-molded product 93 is continued.

Next, in the heat molding step, the control performed by the heat molding apparatus 10 will be described. In the heat forming step, the long sheet 92 is sent out by the conveying unit 11 from the sheet winding roll 91 set on the sheet roll stand 12 by the sheet supply unit 10A, and 1 on the heating side 10Ba of the heat forming unit 10B. It is supplied intermittently in processing units. As a result, on the heating side 10Ba, the long sheet 92 is heated by the heater group 13.

This will be described in detail. FIG. 7 is a diagram showing a time chart per cycle of the heat molding process in the heat molding apparatus according to the embodiment. The heat molding step is a part of the long sheet 92 as one of the treatments, and is a part of a molded product (a part that later becomes a plurality of products 90) and an unnecessary part (later a sheet) formed around it. The sheet 92 is heated in a production system with one processing unit including the unnecessary portion 94). As shown in FIG. 7, in the heat forming step, the number of processes z = n (0 <n) for one cycle is set in advance in the control unit 2.

The heating time of the sheet 92 per treatment is th (sec). Further, the transfer section 11 sends the heat-treated portion of the sheet 92 to the molding side 10Bb for molding, and at the same time, the heat-molding interval is set as the time for the portion waiting for the heat treatment of the sheet 92 to be sent to the heating side 10Ba. The actual measurement time WTm (sec) is required. That is, the tact time Tt per treatment is the time corresponding to the sum of (th + WTm), and the cycle time CT per cycle of the heat forming step is the time corresponding to the product of n × (th + WTm).

After the sheet 92 is heated on the heating side 10Bb, on the molding side 10Bb, the heated sheet 92 is continuously formed on a long semi-molded product 93 formed into a desired shape following the mold shape. Is processed. The elongated semi-molded product 93 is supplied to the trimming device 20 which is continuously subjected to the trimming step in a state of being slackened to some extent in the buffer zone SP between the heat molding device 10 and the trimming device 20.

Next, the mass production system of the product 90 to be manufactured will be described. FIG. 8 is a chart showing the relationship between the tact time and the production mode in the heat molding process by the heat molding apparatus according to the embodiment, and is a time chart diagram when the accelerated production mode includes the start of production of a semi-molded product. be. FIG. 9 is a chart showing the relationship between the tact time and the production mode in the heat molding process by the heat molding apparatus according to the embodiment, and is a time chart diagram when two types of steady production modes having different tact times are included. ..

In a mass production system in which the sheet forming system 1 is operated under automatic operation and the product 90 is continuously manufactured, the operating state of the sheet forming system 1 is accelerated production as shown in FIG. 8 as the first case. Mode I, decelerated production mode II, slow production mode III, and first steady production mode IV are roughly classified into four production modes. Further, as a second case, as shown in FIG. 9, the accelerated production mode I, the decelerated production mode II, the slow production mode III, and the second steady production mode V are roughly classified into four production modes. Sometimes.

In the accelerated production mode I, the tact time Tt in one cycle of the heat forming step is a steady state of the semi-molded product 93 from the start of the production of the product 90 until the quality state of the semi-molded product 93 stabilizes. It is slower than the time t1 (0 <t1) in the first production system that can be processed in. In particular, immediately after the start of production of the product 90, as shown in FIG. 7, if the heating time th of the sheet 92 and the measured time WTm of the heat forming interval are faster than those in the first production system, the sheet is in a heated state. Even if 92 is molded by a mold, a semi-molded product 93 in a stable state cannot be obtained in terms of quality control.

Therefore, in the processing immediately after the start of production of the product 90, first, the tact time Tt at the start of operation (corresponding to the third tact time T3 (T1 <T3) of the present invention) is thrown at time t4 (0 <t <t4). Starting, while checking the quality of the semi-molded product 93, the takt time Tt is once changed to a time t3 (t1 <t3 <t4) slightly earlier than the time t4. After that, the time is changed to t2 (t1 <t2 <t3), which is slightly earlier than the time t3, and the quality of the semi-molded product 93 is confirmed. (Corresponding to 0 <T1)) is changed to time t1. In the first steady production mode IV, the tact time Tt is set under a steady operating state until the sheet 92 cannot be supplied from the sheet winding roll 91 and it is necessary to replace the sheet 92 with the next sheet winding roll 91. The sheet forming system 1 continues to operate at the time t1.

That is, under the situation (accelerated production mode I) in which the semi-molded product 93 is started to be manufactured by using the pre-attached sheet winding roll 91 (previous sheet winding roll 91a), one heat molding step is performed. At the third tact time T3, which is longer than the first tact time T1, the control unit 2 changes the time of one heat forming step from the start of the operation until the first tact time T1 is reached. The first tact time T1 is the time per one heat molding step for manufacturing the semi-molded product 93 under a steady operating state. At this time, as will be described later, the control unit 2 controls the temperature of the heater group 13 following the change from the third tact time T3 to the first tact time T1.

When it is necessary to replace the sheet winding system 1 with the next sheet winding roll 91 while the sheet forming system 1 is in operation, the control unit 2 can use the control method of the heat forming apparatus 10 according to the embodiment in one cycle of the heat forming step. Controls the tact time Tt. In this control method of the heat forming apparatus 10, the time longer than the first tact time T1 under a steady operating state by the adjustment time ΔT (0 <ΔT) is defined as the second tact time T2 (T1 <T2). While the semi-molded product 93 is being manufactured with one tact time T1, the control unit 2 changes to the second tact time T2 instead of the first tact time T1 due to the replacement work of the sheet winding roll 91, and heat-molds. Continue the process.

That is, in the decelerated production mode II, the first tact time T1 (time t1), which was the tact time Tt under the first production system, is temporarily changed to the time t2 slightly later than the time t1. After that, while considering the remaining amount of the sheet 92 that can be sent from the previous sheet winding roll 91 being used, the time required for the replacement work of the sheet winding roll 91, and the like, if necessary, further from time t2. Change to t3 a little later. Then, the time t3 is changed to the time t4 (second tact time T2), and the slow production mode III, which is the mode for exchanging the sheet winding roll 91, is set.

In the slow production mode III, the operator does not stop the sheet forming system 1 and keeps the heat forming process in the heat forming apparatus 10 while the sheet is wound on the sheet winding roll 91 as described above. The end portion 92E of the 92 and the start end portion 92S of the sheet 92 wound on the next newly set sheet winding roll 91b are connected with a tape or the like. As a result, the heat molding apparatus 10 continues to process the semi-molded product 93 while operating in the slow production mode III, enters the first steady-state production mode IV through the accelerated production mode I, and manufactures the semi-molded product 93. ..

Further, during the operation of the sheet forming system 1, for example, the production system during the day shift and the production system during the night shift, the production system during the busy season and the production system during the off-season, and the like, the time zone and timing for producing the product 90. The tact time Tt at the time of the first production system may be changed depending on the above. For example, as shown in FIG. 9, the second steady-state production mode IV in which the tact time Tt is set to time t1 (first tact time T1) is passed, and the tact time Tt is set to time t2 (first tact time T1). When the semi-molded product 93 is being processed in the steady production mode V, as a second case, it may be necessary to replace the sheet winding roll 91. In this case, for example, if the second tact time T2 is not changed, the first tact time T1 is changed. Therefore, the adjustment time ΔT is the tact time Tt of the first steady production mode IV and the second steady production mode. It is adjusted in consideration of the tact time Tt of V.

Next, the delivery control of the semi-molded product 93 performed by the heat molding apparatus 10 will be described with reference to FIG. FIG. 10 is a flowchart showing a flow of control associated with delivery of the semi-molded product.

As shown in FIG. 10, the control unit 2 transmits the semi-molded product 93 to the downstream side of the delivery direction HZ by the transport unit 11 for one cycle of the heat molding process, which is a preset number of transmission settings. Read Wk (S1). Next, the control unit 2 reads the number of times of delivery Wm, which is the number of times the semi-molded product 93 is actually delivered by the transport unit 11 per cycle of the heat molding process while the sheet molding system 1 is in operation. S2).

Next, the control unit 2 compares the transmission set number Wk of the semi-molded product 93 with the transmission execution number Wm of the semi-molded product 93, and determines whether or not the transmission set number Wk is larger than the transmission execution number Wm ( S3). In the case of "NO", the process proceeds to the end, and the semi-molded product 93 is continuously transmitted based on the set number of transmission times Wk. If "YES", the process proceeds to S4. As shown in FIG. 7, the control unit 2 has a heating time th for heating the sheet 92 by the heater group 13 and a heating interval for forming the sheet 92 after heating sent by the transport unit 11 with a mold. A preset target value FTk is read with respect to the heat forming time (tact time Tt) which is the sum (th + WTm) of the measured time WTm (S4).

Next, the control unit 2 reads the actual value FTm of the heat forming time of S4 actually required while the sheet forming system 1 is in operation (S5). Next, the control unit 2 compares the target value FTk of the heat forming time with the implemented value FTm of the heat forming time, and determines whether or not the target value FTk is larger than the implemented value FTm (S6). If "NO", the process proceeds to S8, and if "YES", the process proceeds to S7.

Next, in S7, the adjustment time ΔT is added or subtracted from the actual value FTm of the heat forming time. That is, in the production of the product 90, when the operating status of the sheet forming system 1 is in the deceleration production mode II, the control unit 2 sets the adjustment time ΔT to the actual value FTm of the heat forming time in the heat forming apparatus 10. In addition, adjustments are made to lengthen the first tact time T1 in the heat forming process. On the other hand, when the operating status of the sheet forming system 1 is in the accelerated production mode I, the control unit 2 uses the heat forming apparatus 10 to subtract the adjustment time ΔT from the actual value FTm of the heat forming time to perform heat forming. Adjustments are made to shorten the first tact time T1 of the process.

Next, in S8, the control unit 2 changes the set time of the first tact time T1 in S7 to the adjusted set time FTp instead of the target value FTk as a new target time of the heat forming time. This adjusted set time FTp is set and registered (S9). Thus, the control unit 2 controls the transport unit 11 to deliver the semi-molded product 93.

As described above, at the same time that the delivery control of the semi-molded product 93 is performed by the heat molding apparatus 10, in the control method of the heat forming apparatus 10 according to the embodiment, in the deceleration production mode II, the control unit 2 is the first tact. Following the change from the time T1 to the second tact time T2, the temperature of the heater group 13 is controlled. That is, the control unit 2 sets the heating temperature of the sheet 92 heated by the heater group 13 while changing the tact time Tt per process in the heat forming process from the first tact time T1 to the second tact time T2. The temperature of the heater group 13 is controlled based on the measured temperature of the sheet by the radiation thermometer 15 so that the temperature can be adjusted within the allowable range.

Further, at the same time that the delivery control of the semi-molded product 93 is performed by the heat molding apparatus 10, in the control method of the heat forming apparatus 10 according to the embodiment, in the accelerated production mode I, the control unit 2 has the third tact time T3. The temperature of the heater group 13 is controlled according to the change from the first tact time T1 to the first tact time T1. That is, the control unit 2 sets the heating temperature of the sheet 92 heated by the heater group 13 while changing the tact time Tt per process in the heat forming process from the third tact time T3 to the first tact time T1. The temperature of the heater group 13 is controlled based on the measured temperature of the sheet by the radiation thermometer 15 so that the temperature can be adjusted within the allowable range.

This will be described with reference to FIGS. 8, 9, and 11. FIG. 11 is a flowchart showing a flow of control accompanying heating in the heat molding step by the heat molding apparatus according to the embodiment.

In the sheet forming system 1, with the work of replacing with a new sheet winding roll 91, as shown in FIGS. 8 and 9, the heat forming apparatus 10 is in the situation of the deceleration production mode II, or exactly in the deceleration production mode II. The situation is about to approach. Further, when the production of the semi-molded product 93 is started, the heat molding device 10 is in the accelerated production mode I as shown in FIG. 8 with the start of the operation of the heat molding device 10.

Under such a situation, as shown in FIG. 11, the control unit 2 reads a preset target value FTk for the heat forming time (S21). Next, the heating temperature of the sheet 92 arranged between the upper and lower heater groups 13 is measured by the radiation thermometer 15 installed on the heating side 10Ba of the heat forming unit 10B, and the control unit 2 of the sheet 92. The measured value Sm of the heating temperature is read (S22). Next, the control unit 2 reads the preset seat temperature set value Sk (S23).

Next, the control unit 2 heats the sheet 92 on the heating side 10Ba of the heat molding unit 10B at the heater temperature according to the adjusted set value Hkn (S24). Then, when the heating time by the heater group 13 expires, the difference between the measured value Sm of the heating temperature of the sheet 92 and the set value Sk of the sheet temperature is calculated, and the absolute value of the temperature difference | the actual measurement of the heating temperature. It is determined whether or not the set value Sk | of the value Sm-sheet temperature is within the range of the desired temperature difference (S25).

If "YES", the process proceeds to S27, and if "NO", the process proceeds to S26. In S26, when the absolute value of the temperature difference | the measured value of the heating temperature Sm-the set value Sk of the sheet temperature is not within the range of the desired temperature difference, the control unit 2 prepares for the next heating of the sheet 92. , The heater temperature of the heater group 13 is changed from the set value Hk to the adjusted set value Hkn. Next, the sheet 92 heated in S24 is sent out to the molding side 10Bb of the heat molding section 10B by the transport section 11 (S27). Thus, heating control to the sheet 92 is performed.

The temperature compensation control of the heater group 13 corresponding to the heating temperature of the sheet 92 to be heated will be further described in detail with reference to FIG. FIG. 12 is a graph showing the relationship between the measured temperature of the heated sheet and the temperature of the controlled heater group with respect to the heat molding apparatus according to the embodiment, and is a graph of the heater group based on the measured temperature of the heated sheet. It is explanatory drawing which shows the state of feedback control of a temperature.

As shown in FIG. 2, the control unit 2 is electrically connected to the PLC3, the SSR4 which is a non-contact relay that enables high-speed and high-frequency operation by a semiconductor switching element, the heater group 13, and the radiation thermometer 15. It is connected to and is configured to enable feedback control. The control unit 2 performs feedback control based on the measured temperature of the sheet 92 by the radiation thermometer 15, adjusts the temperature of the heater group 13 stepwise, and based on the updated temperature of the heater group 13, the sheet 92. Adjust the heating temperature.

This will be described in detail. In the heat molding step, as shown in FIG. 7, the tact time per treatment is the sum of the heating time th of the sheet 92 per treatment and the measured time WTm of the heat molding interval per treatment (th + WTm). be. Further, the number of processes z = n (0 <n) for one cycle of the heat forming step is set in advance in the control unit 2, and in the case of FIG. 12 illustrated, the number of processes for one cycle of the heat forming step is set. n = 6. On the other hand, as shown in FIG. 12, the heating temperature of the sheet 92 obtained for each treatment by heating the heater group 13 is a temperature within an allowable range including the set reference temperature (hereinafter, notation in FIG. 12). It is referred to as "seat set temperature").

In the heat forming step 1 treatment, as shown in FIG. 1, the sheet 92 is sent from the sheet supply unit 10A to the heating side 10Ba of the heat forming unit 10B, and is heated by the heater group 13 during the heating time th. As a result, as shown in FIG. 12, the heating temperature of the sheet 92 (referred to as “sheet heating temperature” in FIG. 12) rises from the normal temperature state up to that point to the time-up of the heating time th. At this time, if the heating temperature of the sheet 92 does not satisfy the sheet set temperature when the heating time th is timed up, the set temperature of the heater group 13 to be heated (denoted as "heater set temperature" in FIG. 12) is not applicable. Appropriate. Therefore, it is necessary to adjust the temperature of the heater group 13 step by step based on the heating temperature of the sheet 92 measured at the time-up of the heating time th by the radiation thermometer 15.

For example, if the heating temperature of the sheet 92 is lower than the sheet set temperature when the heating time th is timed up by the previous process, the heater group set slightly higher than the previously set temperature in the next process. The sheet 92 is heated at the temperature of 13. On the contrary, if the heating temperature of the sheet 92 becomes higher than the sheet set temperature when the heating time th is timed up by the previous process, the next process sets it slightly lower than the previously set temperature. The sheet 92 is heated at the temperature of the heater group 13.

In this way, by repeating the temperature control of the heater group 13 gradually and stepwise without increasing the temperature fluctuation range at once, the sheet 92 is stable in terms of quality control to the sheet heating temperature that satisfies the sheet set temperature. The semi-molded product 93 can be easily manufactured with good molding accuracy. Further, since the repeated heat molding process is stabilized at an early stage, the transition to the first steady-state production mode IV (or the second steady-state production mode V) becomes smooth as a result.

By the way, in manufacturing the product 90, for example, when the takt time Tt is changed from t1 to t4 in the deceleration production mode II shown in FIGS. 8 and 9, or in the deceleration production mode II shown in FIG. When changing the time Tt from t2 to t4, when changing the tact time Tt from t4 to t1 in the accelerated production mode I shown in FIG. 8, the tact time per process (Tt = th + WTm) is changed. Sometimes.

In such a case, the heating time th of the sheet 92 per treatment also changes. In this way, if the tact time Tt for performing the heat forming step is changed, the heating time th also changes. Therefore, even if the sheet 92 is heated by the heater group 13, the heating temperature does not reach the sheet set temperature. Sometimes. Therefore, even when the product 90 is being manufactured in a mass production system and the tact time Tt is temporarily changed step by step, the temperature control of the heater group 13 operates for each tact time Tt as shown in FIG. It is repeated corresponding to the tact time Tt of the heat forming process.

Next, the operation and effect of the control method of the heat molding apparatus 10 according to the present embodiment will be described. In the control method of the heat forming apparatus 10 according to the present embodiment, the sheet 92 supplied from the sheet winding roll 91 is heated, and the semi-molded product 93 on which the sheet 92 is formed is heat-molded by the mold. In the control method of the sheet heat forming apparatus for continuously manufacturing by repeating the above steps, the control unit 2 is provided, and the time per one heat molding step for manufacturing the semi-molded product 93 under a steady operation state. Is set to the first tact time T1 (0 <T1), and the time longer than the first tact time T1 by the adjustment time ΔT (0 <ΔT) is set to the second tact time T2 (T1 <T2). While the semi-molded product 93 is being manufactured at the time T1, the control unit 2 changes the second tact time T2 instead of the first tact time T1 due to the replacement work of the sheet winding roll 91, and performs the heat forming process. It is characterized by continuing.

Due to this feature, the operator can sufficiently secure the required working time without stopping the operation of the heat forming apparatus 10 when replacing the sheet winding roll 91 during the operation of the heating forming apparatus 10 and obtain the sheet. The winding roll 91 can be replaced. Therefore, the decrease in productivity of the semi-molded product 93 due to the replacement work of the sheet winding roll 91 is suppressed, and the process capability of the heat molding apparatus 10 can be maintained higher, so that the semi-molded product 93 can be efficiently manufactured. can do.

In particular, conventionally, when replacing the sheet winding roll, when the operation of the sheet heat forming apparatus is temporarily stopped as in Patent Document 1, the sheet of the sheet winding roll before the exchange is used up and the heat forming step is carried out. After stopping, the sheet of the sheet winding roll to be used next is set in the sheet heat forming apparatus, and the operation of the sheet heating forming apparatus is restarted. At this time, for a while immediately after the start of operation, the heating temperature of the sheet and the semi-molded product obtained by molding a part of the inside of the sheet surface after heating are not in a stable state in terms of quality control. Therefore, in order to stabilize the heating temperature of the sheet and the state of the semi-molded product, the sheet heat-molding device performs large-scale heat-molding control as an initial production mode close to the state at the beginning of production of the sheet-molded product. However, it is necessary to heat and mold a new sheet after the roll is replaced. As a result, when such an initial production mode is repeatedly performed in the heat molding process, the productivity of the sheet molded product is further reduced.

On the other hand, in the control method of the heat forming apparatus 10 according to the present embodiment, since the sheet winding roll 91 is replaced while the operation of the heating forming apparatus 10 is continued, the semi-molded product 93 is initially manufactured. As an initial production mode close to the state (accelerated production mode I shown in FIG. 8), it is not necessary to perform large-scale heat molding control of the sheet 92. Therefore, even if the sheet winding roll 91 is replaced during the operation of the heat forming apparatus 10, the productivity decrease of the semi-molded product 93 can be suppressed.

Further, since the operator can perform the replacement work of the sheet winding roll 91 with a sufficient time, the sheet can be exchanged between the previous sheet winding roll 91a and the next sheet winding roll 91b. In connecting the end portion 92E of the 92 and the start end portion 92S of the sheet 92, the sheets 92 and 92 can be appropriately connected to each other under the work of suppressing the connection error. As a result, due to improper connection between the sheets 92 and 92, for example, in addition to the occurrence of defective products, the sheet 92 of the next sheet winding roll 91b to be replaced is the transport unit 11 in the heat forming apparatus 10 and the like. The probability of adversely affecting the production of the semi-molded product 93 is reduced, such as the fact that the sheets 92 and 92 that are connected to each other cannot be set properly and that the connected sheets 92 and 92 are separated from each other due to the delivery operation of the transport unit 11. ..

Therefore, according to the control method of the heat forming apparatus 10 of the present embodiment, even if the sheet winding roll 91 needs to be replaced during the manufacturing of the semi-molded product 93, the semi-molded product 93 can be manufactured. It has an excellent effect that the semi-molded product 93 can be efficiently manufactured without causing any trouble.

Further, in the control method of the heat forming apparatus 10 of the present embodiment, the heater group 13 for heating the sheet 92 is provided, and the control unit 2 follows the change from the first tact time T1 to the second tact time T2. It is characterized by controlling the temperature of the heater group 13.

Due to this feature, the sheet 92 is heated by the heater group 13 in manufacturing the semi-molded product 93 by changing the production mode from the first steady production mode IV and the second steady production mode V to the deceleration production mode II. It is possible to suppress the occurrence of defects. Therefore, it becomes possible to manufacture the semi-molded product 93 with a higher yield.

Further, in the control method of the heat forming apparatus 10 of the present embodiment, the semi-molded product 93 is provided by using the sheet winding roll 91 which is provided with the heater group 13 for heating the sheet 92 and which is previously attached to the sheet roll stand 12. In the situation where manufacturing is started, the control unit 2 has a third tact time T3 (T1 <T3) longer than the first tact time T1 in carrying out one heat forming step, and after starting the operation, the first tact. The feature is that the time of one heat forming step is changed until the time T1 is reached, and the temperature of the heater group 13 is controlled according to the change from the third tact time T3 to the first tact time T1. do.

Due to this feature, when the semi-molded product 93 is manufactured under the accelerated production mode I by starting the operation, it is possible to suppress the occurrence of heating defects due to the heater group 13 with respect to the sheet 92. Therefore, even if the heated sheet 92 is molded by the mold, the semi-molded product 93 in a stable state in terms of quality control can be obtained, and by extension, the yield is further increased to manufacture the semi-molded product 93. Will be possible.

Further, in the control method of the heat forming apparatus 10 of the present embodiment, a radiation thermometer 15 for measuring the heating temperature of the sheet 92 is provided, and the control unit 2 sets the heating temperature of the sheet 92 heated by the heater group 13. It is characterized in that the temperature of the heater group 13 is controlled based on the measured temperature of the sheet by the radiation thermometer 15 so that the temperature can be adjusted within the allowable range.

Due to this feature, even if the heating state of the sheet 92 by the heater group 13 differs depending on the characteristics such as the material and properties of the sheet 92, the heating temperature of the sheet 92 to be heated can be adjusted regardless of the characteristics of the sheet 92 to be heated. , The temperature of the heater group 13 can be easily adjusted.

Further, in the control method of the heat forming apparatus 10 of the present embodiment, the control unit 2 changes from the third tact time T3 to the first tact time T1 while changing from the first tact time T1 to the second tact time T2. Meanwhile, the heating temperature of the sheet 92 is adjusted based on the updated temperature of the heater group 13 while adjusting the temperature of the heater group 13 step by step.

Due to this feature, it is a defective product in manufacturing the semi-molded product 93 even while changing from the first tact time T1 to the second tact time T2 or changing from the third tact time T3 to the first tact time T1. The heating temperature of the sheet 92 by the heater group 13, the heating time th of the sheet 92 by the heater group 13, and the heating interval for forming the sheet 92 after heating sent by the transport unit 11 with a mold. The semi-molded product 93 can be manufactured with good molding accuracy in terms of quality control under more optimum heat molding conditions such as actual measurement time WTm.

Further, in the control method of the heat forming apparatus 10 of the present embodiment, the control unit 2 is characterized in that the temperature of the heater group 13 is adjusted by feedback control based on the actually measured temperature of the sheet 92.

This feature facilitates heating of the sheet 92 at a temperature adjusted to a set desired temperature, as shown in FIG.

Although the present invention has been described above in accordance with the embodiment, the present invention is not limited to the above embodiment, and can be appropriately modified and applied without departing from the gist thereof.

(1) For example, in the embodiment, under the mass production system by the sheet molding system, the semi-molded product 93 is continuously manufactured as the sheet-molded product by the heat-molding apparatus 10, and then the semi-molded product 93 is manufactured by the trimming apparatus 20. The sheet unnecessary portion 94 of the molded product 93 was trimmed to obtain a product 90. However, the sheet heat molding apparatus does not require a sheet trimming apparatus such as the trimming apparatus 20 of the embodiment, and may be an apparatus for manufacturing a sheet molded product which is a product as a sheet molded product.

(2) Further, in the embodiment, in the accelerated production mode I illustrated in FIGS. 8 and 9, and in the decelerated production mode II, the tact time Tt is set to three stages between the time t1 and the time t4, and the time t2. The time t4 was adjusted in two stages. However, the number of adjustments of the takt time Tt is not limited to the embodiment, and the takt time Tt may be adjusted stepwise.

2 Control unit 10 Heat molding equipment (sheet heat molding equipment)
12 Heater group (heater)
15 Radiation thermometer (temperature measuring means)
91 Sheet winding roll 92 Sheet 93 Semi-molded product (sheet molded product)

Claims (6)

Control of a sheet heat-molding device that heats a sheet supplied from a sheet winding roll and continuously manufactures a sheet-molded product on which the sheet is molded by a mold by repeating the heat-molding process. In the method
Equipped with a control unit
The time per one heat molding step of manufacturing the sheet molded product under a steady operation state is set to the first tact time T1 (0 <T1), and the adjustment time ΔT (0) is set from the first tact time T1. Let the second tact time T2 (T1 <T2) be the time extended by <ΔT).
While the sheet molded product is being manufactured at the first tact time T1, the control unit changes to the second tact time T2 instead of the first tact time T1 due to the replacement work of the sheet winding roll. To continue the heat molding process,
A method for controlling a sheet heat molding apparatus. In the control method for the sheet heat molding apparatus according to claim 1,
A heater for heating the sheet is provided.
The control unit controls the temperature of the heater in accordance with the change from the first tact time T1 to the second tact time T2.
A method for controlling a sheet heat molding apparatus. In the control method of the sheet heat molding apparatus according to claim 1 or 2.
A heater for heating the sheet is provided.
In the situation where the sheet molded product is started to be manufactured by using the sheet winding roll attached in advance, the heat molding step is carried out once.
The control unit has a third tact time T3 (T1 <T3), which is longer than the first tact time T1, and is the time for one heat forming step from the start of operation until the first tact time T1 is reached. And to control the temperature of the heater by following the change from the third tact time T3 to the first tact time T1.
A method for controlling a sheet heat molding apparatus. In the control method of the sheet heat molding apparatus according to claim 2 or 3.
A temperature measuring means for measuring the heating temperature of the sheet is provided.
The control unit controls the temperature of the heater based on the actual measured temperature of the sheet by the temperature measuring means so that the heating temperature of the sheet heated by the heater can be adjusted to a temperature within a set allowable range. matter,
A method for controlling a sheet heat molding apparatus. In the control method of the sheet heat molding apparatus according to claim 4,
The control unit steps the temperature of the heater while changing from the first tact time T1 to the second tact time T2, or changing from the third tact time T3 to the first tact time T1. Adjusting the heating temperature of the sheet based on the updated temperature of the heater, while adjusting to
A method for controlling a sheet heat molding apparatus. In the control method of the sheet heat molding apparatus according to claim 4 or 5.
The control unit adjusts the temperature of the heater by feedback control based on the measured temperature of the sheet.
A method for controlling a sheet heat molding apparatus.

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