JP2010264477A5 - - Google Patents

Description

Press machine

  The present invention relates to a press apparatus for manufacturing a resin molded product by heating and pressing a workpiece.

  In order to manufacture plate-shaped resin molded products such as electronic circuit boards and IC plastic cards, a pressing device such as that described in Patent Document 1 is used. The pressing device has at least two hot plates whose temperature is adjusted, and heats and presses a workpiece on which a resin sheet, a copper foil, and the like are laminated, to produce a resin molded product.

  As a method of adjusting the temperature of the hot platen, there is a method of forming a pipe line in the hot platen and circulating a heat medium whose temperature is adjusted in a circulation path including the pipe line. The heating medium is heated by passing the heating medium through a heater provided in the circulation path. The temperature adjustment of the hot platen during heating is performed by adjusting the output of the heater. The hot platen is cooled by passing a part of the heat medium circulating in the circulation path through the cooler.

Japanese Patent Laid-Open No. 3-97044

  In such a conventional press apparatus, when adjusting the temperature of the hot platen, in addition to the hot platen itself, the temperature of all the heat mediums flowing in the circulation path, the heaters, and the pumps for circulating the heat medium are changed. It will be. That is, when heating the hot platen, energy for heating the heating medium, the heater and the pump is required in addition to the energy for heating the hot platen itself.

  As described above, in the conventional press apparatus, a part of the heat energy generated by the heater is used to heat the heat medium, the heater and the pump, so that the heating plate is heated at a high heating rate. In this case, a heater having a sufficiently high output with respect to the heat capacity of the hot plate is required.

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a press device capable of heating a hot platen at a high temperature rise rate with a heater having a relatively low output.

The press device according to the present invention is connected to a conduit in a heating plate through which a heating medium formed in the heating plate passes, and an inlet and an outlet of the conduit in the heating plate, and the heating medium in the conduit in the heating plate. A temperature control unit for moving the temperature , a switching means for selectively connecting any one of the temperature control units to the pipe in the hot platen, and a temperature control unit to be connected to the pipe in the hot platen And a selection means for controlling the switching means , and each of the plurality of temperature control sections includes a hot platen outer conduit that can be connected to an inlet and an outlet of the hot platen internal conduit, and a hot platen external conduit , respectively. A plurality of temperature control units , each having a heater that heats a heating medium that moves in the outer pipe of the heating plate to a predetermined set temperature, and a pump that transports the heating medium in the outer heating pipe. In FIG. 2, the set temperature can be set to different temperatures .

Preferably, a plurality of temperature control unit set temperature respectively a first temperature control unit can be set to a first temperature, a second capable of setting the set temperature higher than the first temperature second temperature A temperature control unit , and the selection means selects the second temperature control unit as a temperature control unit to be connected after a predetermined time has elapsed after the first temperature control unit is connected to the conduit in the hot platen. to Ru switching the connection of the switching means.

More preferably, the plurality of temperature control units may be a first temperature control unit that can set the set temperature to the first temperature, and a second temperature that can set the set temperature to a second temperature higher than the first temperature. And a third temperature control unit capable of setting the set temperature to a third temperature higher than the second temperature , wherein the first temperature is higher than the ambient temperature and the workpiece is softened. The temperature is lower than the start temperature, the second temperature is higher than the softening start temperature of the workpiece and lower than the cure start temperature of the workpiece, and the third temperature is the cure start temperature of the workpiece. Higher temperature .

Further, each of the plurality of temperature control unit has a bypass pipe that bypasses the upstream side and the downstream side of the heater and the pump of the heat plate outside conduit, a plurality of temperature control unit is not selected by the selecting means If, it is preferable to so that configuration by circulating heating medium in the path formed by the heating plate outer conduit and the bypass tube.

More preferably, an opening / closing valve is provided in the middle of the bypass pipe, and the selection means controls the opening / closing valve so that the heat medium does not flow through the bypass pipe of the selected temperature control unit.

Moreover, it is preferable that the temperature control unit having the lowest set temperature among the plurality of temperature control units has a cooler for cooling the heat medium flowing through the outer pipe of the hot platen.

In addition, when the heating plate is cooled, the selection means may be configured to select the temperature adjustment portion having the lowest set temperature among the plurality of temperature adjustment portions as the temperature adjustment portion to be connected to the pipe in the heating plate. More preferred.

  More preferably, the selection means stops the heater of the selected temperature control unit when cooling the hot platen.

  As described above, the press device of the present invention has a plurality of temperature control units for circulating the heating medium while heating. Then, based on the detected temperature of the hot platen, the temperature control unit itself is heated by selecting the temperature control unit connected to the pipe in the hot platen of the hot platen so that the temperature change of the temperature control unit becomes small. Therefore, the amount of heat energy consumed can be kept low. For this reason, most of the heat energy output from the heater is used for heating the hot platen, and even a relatively low output heater can heat the hot platen at a high temperature rise rate. It becomes like this.

FIG. 1 is a circuit diagram of a press apparatus according to an embodiment of the present invention. FIG. 2 is a flowchart showing a procedure for performing hot pressing of a workpiece using the press device according to the embodiment of the present invention. FIG. 3 is a circuit diagram showing a state when the hot platen is heated to a low temperature in the press device according to the embodiment of the present invention. FIG. 4 is a circuit diagram showing a state when the hot platen is heated to a medium temperature in the press device according to the embodiment of the present invention. FIG. 5 is a circuit diagram showing a state when the hot platen is heated to a high temperature in the press device according to the embodiment of the present invention. FIG. 6 is a circuit diagram showing a state when the hot platen is cooled in the press device according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram of a press apparatus according to an embodiment of the present invention. In the press device 1 of the present embodiment, a plurality of heating plates 63, 64 and 65 are disposed between the table surface plate 61 and the crown surface plate 62, and a workpiece is inserted between the heating plates, In this apparatus, the table surface plate 61 is moved up by a drive mechanism (such as a hydraulic cylinder mechanism) (not shown) so that the hot plates are brought close to each other and the workpiece is heated and pressed between the hot plates. The press apparatus 1 of the present embodiment includes a lower heating plate 63 fixed on a table surface plate 61, an upper heating plate 64 fixed under a crown surface plate 62, a lower heating plate 63, and an upper heating plate 64. This is a so-called multi-stage press apparatus having an intermediate heating plate 65 disposed between them, and can heat-press a plurality of sets of workpieces at a time. In FIG. 1, only one intermediate heating plate 65 is shown, but a plurality of intermediate heating plates 65 may be arranged side by side between the upper heating plate 64 and the lower heating plate 63. is there.

  Inside the hot plates 63 to 65, meandering hot plate pipes 63a to 65a are provided. The inlets of the hot platen pipes 63a to 65a are connected to the heat medium branching portion 43 disposed outside the hot platen. Similarly, the outlets of the hot platen pipelines 63a to 65a are connected to the heat medium junction 44 disposed outside the hot platen.

  As shown in FIG. 1, the heat medium branching portion 43 and the heat medium junction portion 44 are connected to the high temperature temperature adjusting portion 10, the intermediate temperature adjusting portion 20, and the low temperature temperature adjusting portion 30.

The high temperature controller 10 includes a pump 11 and an external heater system 12. Pump 11, from the upstream side pipe 14 connected to the heating medium merging portion 44, and is capable of transporting heat medium to the downstream side conduit 13 connected to the heat medium bifurcation 43 . The external heater system 12 is disposed on the upstream side of the pump 11, and the controller 51 of the press device 1 has a temperature of the heat medium (set temperature) flowing from the upstream side pipe 14 toward the downstream side pipe 13. The output of the external heater system 12 is controlled so as to be maintained at a high temperature setting temperature determined between 300 and 400 ° C. The high temperature set temperature can be appropriately changed according to the molding profile determined from the material and shape of the workpiece.

  A downstream on-off valve SV11 and an upstream on-off valve SV13 are provided in the middle of the downstream pipe 13 and the upstream pipe 14, respectively. In a state in which the downstream side open / close valve SV11 and the upstream side open / close valve SV13 are open, the heat medium whose temperature is adjusted by the external heater system 12 passes through the downstream side pipe line 13 and the heat medium branching portion 43, and is connected to the inside of the hot platen. After being transported to 63 a to 65 a to heat the hot platen, the heat return is returned to the external heater system 12 through the heat medium junction 44 and the upstream pipe 14. That is, in the state in which the downstream on-off valve SV11 and the upstream on-off valve SV13 are opened and the high temperature temperature control unit 10 is connected to the hot plate internal pipes 63a to 65a, the hot plate internal pipes 63a to 65a and the high temperature control unit The heating medium whose temperature is adjusted by the external heater system 12 circulates in the main circulation path formed by the heater 10, and the heating plate is heated.

  Further, a bypass pipe 15 is provided between the downstream on-off valve SV 11 and the pump 11 in the downstream pipe line 13 and between the upstream on-off valve SV 13 and the external heater system 12 in the upstream pipe line 14. . A bypass opening / closing valve SV12 is provided in the middle of the bypass pipe 15. In a state where the downstream on-off valve SV11 and the upstream on-off valve SV13 are closed and the bypass on-off valve SV12 is open, the heat medium transported by the pump 11 does not go to the heat medium inner pipes 63a to 65a. It returns to the external heater system 12 through the bypass pipe 15. That is, in this state, the heat medium circulates in the auxiliary circulation path including the bypass pipe 15. In this state, the amount of heat transferred from the circulating heat medium to the outside of the apparatus is small, and the output of the external heater system 12 necessary for maintaining the temperature of the heat medium at a high temperature can be kept low.

  The intermediate temperature controller 20 includes a pump 21 and an external heater system 22. The pump 21 can transport the heat medium from the upstream pipe line 24 connected to the heat medium junction part 44 to the downstream pipe line 23 connected to the heat medium branch part 43. The external heater system 22 is disposed on the upstream side of the pump 21, and the controller 51 has a temperature (set temperature) of the heat medium flowing from the upstream side conduit 24 toward the downstream side conduit 23 of 100 to 200 ° C. The external heater system 22 is controlled so as to be maintained at a medium temperature set temperature determined during the period. The intermediate temperature set temperature can be appropriately changed according to the molding profile determined by the material and shape of the workpiece.

  A downstream on-off valve SV21 and an upstream on-off valve SV23 are provided in the middle of the downstream pipe 23 and the upstream pipe 24, respectively. In the state in which the downstream on-off valve SV21 and the upstream on-off valve SV23 are open, the heat medium whose temperature is adjusted by the external heater system 22 passes through the downstream pipe line 23 and the heat medium branching portion 43, and is in the hot platen pipe line. After being transported to 63 a to 65 a to heat the hot platen, the heat return is returned to the external heater system 22 through the heat medium junction 44 and the upstream pipe line 24. That is, in the state where the downstream side on-off valve SV21 and the upstream side on-off valve SV23 are opened and the intermediate temperature control unit 20 is connected to the hot platen pipelines 63a to 65a, the hotplate internal pipes 63a to 65a and the intermediate temperature control unit A heat medium whose temperature is adjusted by the external heater system 22 circulates in the main circulation path formed by the heat exchanger 20, and the heating plate is heated.

Further, a bypass pipe 25 is provided between the downstream on-off valve SV 21 and the pump 21 in the downstream pipe line 23 and between the upstream on-off valve SV 23 and the external heater system 22 in the upstream pipe 24. . In the middle of the bypass pipe 25, a bypass on-off valve SV22 is provided. In the state where the downstream side open / close valve SV21 and the upstream side open / close valve SV23 are closed and the bypass open / close valve SV22 is open, the heat medium transported by the pump 21 does not go to the heat medium inner pipes 63a to 65a. It returns to the external heater system 22 through the bypass pipe 25. That is, in this state, the heat medium circulates in the auxiliary circulation path including the bypass pipe 25. In this state, the amount of heat transferred from the heat medium circulating outside the apparatus is small, the output of the external heater system 22 required to maintain the temperature of the heating medium to moderate temperatures are kept low.

  The low temperature controller 30 has a pump 31 and an external heater system 32. The pump 31 can transport the heat medium from the upstream pipe line 34 connected to the heat medium junction part 44 to the downstream pipe line 33 connected to the heat medium branch part 43. . The external heater system 32 is disposed on the upstream side of the pump 31, and the controller 51 of the press device 1 has a temperature (set temperature) of the heat medium flowing from the upstream side pipe 34 toward the downstream side pipe 33. The output of the external heater system 32 is controlled so as to be maintained at a low temperature setting temperature determined between 50 and 100 ° C. The low temperature set temperature can be appropriately changed according to the molding profile determined from the material, shape, etc. of the workpiece.

  A downstream on-off valve SV31 and an upstream on-off valve SV33 are provided in the middle of the downstream pipe 33 and the upstream pipe 34, respectively. In a state in which the downstream side open / close valve SV31 and the upstream side open / close valve SV33 are open, the heat medium whose temperature is adjusted by the external heater system 32 passes through the downstream pipe line 33 and the heat medium branching part 43, and is connected to the hot platen pipe line. After being transported to 63a to 65a to heat the hot platen, the heat return is returned to the external heater system 32 via the heat medium junction 44 and the upstream pipe 34. That is, in the state where the downstream on-off valve SV31 and the upstream on-off valve SV33 are opened and the low temperature controller 30 is connected to the hot plate internal pipes 63a to 65a, the hot plate internal pipes 63a to 65a and the low temperature controller The heat medium whose temperature is adjusted by the external heater system 32 circulates in the main circulation path formed by 30 and the heating plate is heated.

  Further, a bypass pipe 35 is provided between the downstream on-off valve SV31 and the pump 31 in the downstream pipe 33 and between the upstream on-off valve SV33 and the external heater system 32 in the upstream pipe 34. . A bypass opening / closing valve SV32 is provided in the middle of the bypass pipe 35. In a state where the downstream on-off valve SV31 and the upstream on-off valve SV33 are closed and the bypass on-off valve SV32 is open, the heat medium transported by the pump 31 does not go to the heat medium inner pipes 63a to 65a. It returns to the external heater system 32 through the bypass pipe 35. That is, in this state, the heat medium circulates in the auxiliary circulation path including the bypass pipe 35. In this state, the amount of heat transferred from the circulating heat medium to the outside of the apparatus is small, and the output of the external heater system 32 required to maintain the temperature of the heat medium at a low temperature can be kept low.

A branch pipe 38 is provided between the external heater system 32 and the upstream on-off valve S V 33 in the upstream pipe 34. Similarly, a branch pipe 37 is also provided in the pipe between the pump 31 and the external heater system 32. The branch pipe 38 is connected to the inlet of the cooler 39, and the branch pipe 37 is connected to the outlet of the cooler 39. A three-way switching valve SV34 is provided at a portion where the branch pipe 38 branches from the upstream pipe line 34. The three-way switching valve SV34 is a valve for switching whether the heat medium flowing through the upstream pipe line 34 is sent to the external heater system 32 or the cooler 39. When the heating medium is sent to the external heater system 32, the heating medium is heated so that the temperature is maintained at a low temperature, while when the heating medium is sent to the cooler 39, the heating medium is cooled. The

The on-off valves SV11 to 13 and SV21 to 23, SV31 to 33 of the high temperature temperature control unit 10, the intermediate temperature control unit 20 and the low temperature control unit 30 described above, and the three-way switching valve SV34 of the low temperature control unit 30 are the controller 51. Is controlled by. The controller 51 controls these valves on the basis of the measurement result of the temperature sensor 52 provided on the hot platen of the press device 1 when the workpiece is heated and pressed, and the hot plate changes the desired temperature. Adjust as follows. The method will be described below.

  FIG. 2 is a flowchart showing a procedure for performing a heat press of a workpiece by the press device 1 of the present embodiment to form a resin molded product. Hereinafter, the procedure of the heating press will be described based on this flowchart. In the following example, since the resin material constituting the workpiece starts to soften at about 150 ° C. and starts to harden at about 300 ° C., the medium temperature set temperature is 170 ° C. and the high temperature set temperature is 320 ° C. ℃. Moreover, the low temperature set temperature is set to 100 ° C., which is approximately between the atmospheric temperature (about 30 ° C.) of the press device 1 and the medium temperature set temperature.

First, a workpiece is carried between the hot plates 63, 64 and 65 (step S1). Next, the table surface plate 61 is raised so that the workpiece is sandwiched between the heating plates (step S2). At this time, the pressure applied to the workpiece, the degree to which the heating plate and the workpiece is contacted lightly, you are not to damage subjected to any excessive pressure in front of the workpiece to be softened.

Next, the low temperature controller 30 is connected to the hot plate internal pipes 63a to 65a (step S3). At this time, the three-way switching valve SV 3 4 of the low-temperature temperature control unit 30 is switched so that the heat medium flowing through the upstream pipe 34 passes through the external heater system 32. Then, as shown in FIG. 3, the heat medium heated by the external heater system 32 of the low-temperature temperature control unit 30 circulates in the main circulation path MR1 (thick line portion) including the low-temperature temperature control unit 30, and this heat medium. As a result, the hot platen is heated to a low temperature setting.

At this time, the on-off valves SV11 and SV13 of the high-temperature temperature control unit 10 are closed and SV12 is open, and the heat medium transported by the pump 11 passes through the sub-circulation path SR1 ( bypass pipe 15 and external heater system 12). The route indicated by the arrow is circulating. Similarly, the on-off valves SV21 and SV23 of the intermediate temperature control unit 20 are closed and SV22 is open, and the heat medium transported by the pump 21 is indicated by an arrow passing through the sub-circulation path SR2 (the bypass pipe 25 and the external heater system 22). The route shown ) is circulating.

The controller 51 measures the elapsed time after the low temperature controller 30 is connected to the hot plate internal pipes 63a to 65a with a built-in timer. Then, after the time measured by the timer reaches the first time determined by the heat capacity of the hot platen and the characteristics of the workpiece, the controller 51 determines that the entire workpiece has been heated to the low temperature setting temperature. Then, the on-off valves SV31 and SV33 of the low-temperature temperature control unit 30 are closed, and the on-off valve SV32 is opened to shut off the low-temperature temperature control unit 30 from the hot plate internal pipes 63a to 65a. Then, the medium-temperature temperature control unit 20 connected to the heating plate in a conduit 63A～65a (step S4). Then, as shown in FIG. 4, the heat medium heated by the external heater system 22 of the intermediate temperature control unit 20 circulates in the main circulation path MR2 (thick line portion) including the intermediate temperature control unit 20, and this heat medium. As a result, the hot platen is heated to a medium temperature set temperature. Then, the workpiece heated to the intermediate temperature set temperature by the hot platen is softened.

At this time, since the on-off valves SV11 and SV13 of the high-temperature temperature control unit 10 are closed and SV12 is open, the heat medium transported by the pump 11 circulates in the sub-circulation path SR1. Similarly, since the on-off valves SV31 and SV33 of the low-temperature temperature control unit 20 are closed and SV32 is open, the heat medium transported by the pump 31 is transferred to the auxiliary circulation path SR3 (an arrow passing through the bypass pipe 35 and the external heater system 32). The route indicated by ) is circulated.

The controller 51 measures an elapsed time after the intermediate temperature controller 20 is connected to the hot plate internal pipes 63a to 65a with a built-in timer. Then, after the time measured by the timer reaches the second time determined by the heat capacity of the hot platen and the characteristics of the work piece, the controller 51 reaches the intermediate temperature set temperature and is sufficiently softened. The controller 51 drives the table surface plate 61 to start pressing the workpiece (step S5). During this pressing, the controller 51 controls the drive mechanism of the table surface plate 61 so that the pressure applied to the workpiece is maintained at a predetermined pressing pressure.

Next, the controller 51 closes the on-off valves SV21 and SV23 of the intermediate temperature control unit 20 and opens the on-off valve SV22, thereby shutting off the intermediate temperature control unit 20 from the hot platen pipes 63a to 65a. Then, the high-temperature temperature control unit 10 is connected to the hot platen pipes 63a to 65a (step S6). Then, as shown in FIG. 5, the heat medium heated by the external heater system 12 of the high temperature temperature control unit 10 circulates in the main circulation path MR3 (thick line portion) including the high temperature temperature control unit 10, and this heat medium. As a result, the hot platen is heated to a high temperature setting temperature. As a result, the workpiece is heated and pressed to form a resin molded product.

Next, the controller 51 closes the on-off valves SV11 and SV13 of the high-temperature temperature control unit 10, opens the on-off valve SV12, and shuts off the high-temperature temperature control unit 10 from the hot plate internal pipes 63a to 65a. And the low temperature control part 30 is connected to the hot-plate internal pipe lines 63a-65a. Further, the three-way switching valve SV34 is switched so that the heat medium flowing in the upstream pipe line 34 of the low-temperature temperature control unit 30 is directed to the cooler 39. Then, as shown in FIG. 6, the heating medium circulating through the main circulation path MR1 (thick line portion) including the low temperature controller 30 is cooled by the cooler 39, and the heating plate is cooled to room temperature by this heating medium. (Step S7). As described above, after performing the heat press, by performing the press while cooling the hot platen and the resin molded product, it is possible to obtain a resin molded product free from warping or deformation of the resin molded product that may occur during cooling.

The controller 51 monitors the detection result of the temperature sensor 52 that measures the temperature of the hot platen, and based on this detection result, whether or not the resin molded product sandwiched between the hot platen and the hot platen has cooled sufficiently. Deciding. When the controller 51 determines that the hot platen and the resin molded product are sufficiently cooled, the controller 51 lowers the table surface plate 61 to widen the interval between the hot plates (step S8). Further, at this time, since the temperature of the heat medium flowing through the cold temperature adjustment part 30 is lowered to room temperature, opened on-off valve SV32, hot plates in tubes cold temperature control unit 30 closes the on-off valve SV31 and SV33 shielded from the road 63A～65a, further, 50 to 100 ° C. the temperature of the heat medium by switching the three-way valve SV34 as heat medium flowing in the upstream pipe 34 of the low-temperature temperature control unit 30 toward the external heater system 32 Raise to a low temperature.

  And the resin molded product cooled to normal temperature is taken out from a hot platen (step S9). As described above, by performing steps S1 to S9, the workpiece is heated and pressed, and a resin molded product is obtained.

In the press device 1 of the present embodiment, as described above, when the workpiece is press-molded, from the three types of temperature control units 10 to 30 each having a different set temperature, the one having a lower set temperature. It is used as a temperature control unit used for heating the heating plate in order. For this reason, the temperature change of the temperature control unit itself when heating the hot platen becomes relatively small, and the amount of heat energy consumed for heating the temperature control unit itself can be kept low. For this reason, much of the thermal energy output from the external heater system is used for heating the hot platen, and even with a relatively low output external heater system, the hot platen is heated at a high temperature rise rate. Will be able to. In addition, since the heat medium in the temperature control unit that is not used circulates in the secondary circulation path, the amount of heat released from the heat medium to the outside of the device is kept low, and the output of the external heater system in the temperature control unit is low. Become. Thus, in the press apparatus 1 of this embodiment, the heat released to the outside of the apparatus becomes relatively small, and the amount of energy consumed by the external heater system for each heating press is kept small. In addition, since it is configured to sequentially switch multiple temperature control units with different set temperatures, energy loss for heating the heat medium and the external heater system itself can be suppressed, and even an external heater system with a small output can be quickly performed. The hot platen can be heated.

  In the present embodiment, the number of temperature control units is set to 3, but the present invention is not limited to this configuration, and the temperature control unit has two or four or more temperature control units for high temperature and low temperature. It is good also as a structure provided with a part. In addition, depending on the type of workpiece, not all temperature control units may be used. For example, when molding a workpiece having a softening temperature of less than 100 ° C. and a molding temperature of less than 200 ° C., only the low temperature temperature control section and the medium temperature control section are used.

DESCRIPTION OF SYMBOLS 1 Press apparatus 10 High temperature temperature control part 20 Medium temperature control part 30 Low temperature temperature control part 51 Controller 52 Temperature sensor 63 Lower heating plate 64 Upper heating plate 65 Intermediate heating plate 63a, 64a, 65a

Claims (8)

A press device for heating and pressing a workpiece between hot plates,
A hot platen passage through which a heat medium formed in the hot plate is passed;
A plurality of temperature control units connected to an inlet and an outlet of the hot platen conduit and moving the heat medium in the hotplate pipeline ;
Switching means for selectively connecting any one of the plurality of temperature control sections to the pipe in the hot platen;
Selecting a temperature control part to be connected to the pipe in the heating plate, and having a selection means for controlling the switching means ,
Each of the plurality of temperature control units is
A hot platen outer pipe that can be connected to an inlet and an outlet of the hot platen inner pipe,
A heater that is disposed within the hot platen outer conduit and that heats the heating medium moving through the hot platen outer conduit to a predetermined set temperature ;
Disposed in said heating plate outer conduit has a pump for transporting the heating medium,
The press apparatus , wherein the set temperature can be set to different temperatures in the plurality of temperature control sections . The plurality of temperature control units include a first temperature control unit that can set the set temperature to a first temperature , and a second temperature that can set the set temperature to a second temperature higher than the first temperature. Including a temperature control unit,
Wherein said selecting means after said first temperature control unit is connected to the heating plate in the conduit predetermined time elapses, selected and the second temperature control unit as the temperature control unit to be the connection pressing apparatus according to claim 1, characterized in Rukoto switching the connection of the switching means. The plurality of temperature control units include a first temperature control unit that can set the set temperature to a first temperature, and a second temperature that can set the set temperature to a second temperature higher than the first temperature. And a third temperature control unit capable of setting the set temperature to a third temperature higher than the second temperature ,
The first temperature is higher than the ambient temperature and lower than the softening start temperature of the workpiece, and the second temperature is higher than the softening start temperature of the workpiece and starts hardening of the workpiece. The press apparatus according to claim 1, wherein the press apparatus is a temperature lower than a temperature, and the third temperature is a temperature higher than a curing start temperature of the workpiece . It said plurality of respective temperature control unit includes a bypass pipe that bypasses the upstream side and the downstream side of the heater and the pump of the heating plate outer conduit,
Wherein the plurality of temperature control unit, when it is not selected by said selecting means, wherein, wherein Rukoto by circulating the heating medium in the path formed between the heating plate outer conduit by the said bypass tube The press apparatus as described in any one of Claims 1-3. An on-off valve is provided in the middle of the bypass pipe, and the selection means controls the on- off valve so that a heat medium does not flow through the bypass pipe of the selected temperature control unit. 4. The press device according to 4. Wherein the setting temperature is the lowest temperature controller of the plurality of temperature control unit of claims 1 to 5, characterized in that it comprises a cooler for cooling the heat medium flowing through the heating plate outer pipe The press apparatus as described in any one . The selection means, when cooling the heat plate, to select a temperature control portion having the lowest set temperature among the plurality of temperature control portions as a temperature control portion to be connected to the pipe in the heat plate. The press apparatus according to claim 6, wherein the press apparatus is characterized in that:   The press device according to claim 7, wherein the selection unit stops the heater of the selected temperature control unit when the hot platen is cooled.