CN111037989B - Hot press device and temperature control method of hot press device - Google Patents
Hot press device and temperature control method of hot press device Download PDFInfo
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- CN111037989B CN111037989B CN201910920225.1A CN201910920225A CN111037989B CN 111037989 B CN111037989 B CN 111037989B CN 201910920225 A CN201910920225 A CN 201910920225A CN 111037989 B CN111037989 B CN 111037989B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/34—Heating or cooling presses or parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/26—Programme control arrangements
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Abstract
The invention provides a hot press device having a plurality of hot plates for temperature control by a heat medium and a temperature control method of the hot press device, and the hot press device has excellent responsiveness and stability during temperature control. A hot press device (11) provided with a plurality of hot plates (16) for temperature control by a heat medium is provided with: a temperature sensor (37) for detecting the temperature of the heat medium in the heat medium supply line (36) of the heat medium supply device (13) or in the line (24) connected from the heat medium supply device (13) to the press device (12); temperature sensors (19, 25, 28) for detecting the temperature of a hot plate (16) or the temperature of a heat medium of the press device (12); and a control device (20) for controlling the temperature of the hot plate (16) by using the detection values of the temperature sensors (19, 25, 28, 37).
Description
Technical Field
The present invention relates to a hot press apparatus including a plurality of hot plates temperature-controlled by a heat medium, and a temperature control method for the hot press apparatus.
Background
Conventionally, as a hot press apparatus including a plurality of hot plates whose temperature is controlled by a heat medium, techniques described in patent documents 1 and 2 are known. Patent document 1 discloses a temperature control method for a hot press including a hot plate for temperature control by a heat medium and a pressing device for pressing a workpiece placed on the hot plate, wherein the temperature of any two of the heat medium in an inlet manifold distributed and supplied to each hot plate, the heat medium in an outlet manifold discharged and collected from each hot plate, and the hot plate is detected, the two temperatures are switched and selected in accordance with a step of a temperature setting mode, and feedback control is performed so that the selected temperature value coincides with the temperature setting mode. In patent document 2, a temperature sensor is attached to a passage of the heat carrier between the pump and the multistage press device.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 3785352 (claim 1, FIG. 1)
Patent document 2: japanese examined patent publication (JP-B) No. 3-67480 (claim 1, FIG. 1)
Disclosure of Invention
Problems to be solved by the invention
However, in the case of the temperature control of the hot pressing heat medium supply device of the patent document, the temperature control of the hot plate of the press device may not be performed sensitively in accordance with the temperature of the heat medium inside the pipe connected from the heat medium supply device to the press device. This problem is more pronounced when the heat medium supply device and the press device are separated from each other, and the distance between the pipes is long and the amount of heat medium in the pipes is large.
Accordingly, an object of the present invention is to provide a hot press apparatus and a control method of the hot press apparatus, which are excellent in response and stability during temperature control, wherein the hot press apparatus includes a plurality of hot plates that are temperature-controlled by a heat medium.
Means for solving the problems
A hot press device according to claim 1 of the present invention includes a plurality of hot plates whose temperatures are controlled by a heat medium, and includes: a first temperature sensor for detecting the temperature of the heat medium supply pipeline of the heat medium supply device or the temperature of the heat medium connected to the pipeline of the punching device from the heat medium supply device; second to fourth temperature sensors for detecting the temperature of a hot plate or a heat medium of the press device; and a control device for controlling the temperature of the hot plate by using the detection value of each temperature sensor.
The hot press apparatus according to claim 2 of the present invention is the hot press apparatus according to claim 1, wherein the first temperature sensor is provided upstream or downstream of the pump of the heat medium supply line, and detects the temperature of the heat medium which is subjected to temperature control and is supplied to the press apparatus.
A method for controlling a temperature of a hot press apparatus according to claim 3 of the present invention is a method for controlling a temperature of a hot press apparatus including a plurality of hot plates for temperature control by a heat medium, the method including the steps of: detecting the temperature of the heat medium supplied to the stamping device by using a first temperature sensor or a pipeline connected with the stamping device from the heat medium supply device; and detecting the temperature of a hot plate of the press device or the temperature of the heat medium by using second to fourth temperature sensors, and controlling the temperature of the hot plate by using the detection values of the temperature sensors.
In claim 4 of the present invention, the method of controlling the temperature of the hot press apparatus according to claim 3, wherein the second to fourth temperature sensors for detecting the temperature of the heat medium are provided at least in the discharge-side manifold in the press apparatus, and the temperature of the hot plate is controlled without using the second temperature sensor provided in the supply-side manifold.
ADVANTAGEOUS EFFECTS OF INVENTION
The hot press apparatus of the present invention includes a plurality of hot plates that are temperature-controlled by a heat medium, and further includes a temperature sensor that detects a temperature of the heat medium in a heat medium supply line of the heat medium supply apparatus or a line connected from the heat medium supply apparatus to the press apparatus, a temperature sensor that detects a temperature of the hot plates of the press apparatus or a temperature of the heat medium, and a controller that controls a temperature of the hot plates using detection values of the temperature sensors, and thus has excellent responsiveness and stability in temperature control.
Drawings
Fig. 1 is a schematic explanatory view of a hot press apparatus according to the present embodiment.
Fig. 2 is a diagram showing temperature control of a hot plate of the hot press apparatus according to the present embodiment.
Fig. 3 is a diagram showing a setting screen of a control device of the hot press device according to the present embodiment.
In the figure:
11-hot press unit, 12-press unit, 13-heat medium supply unit, 16-hot plate, 19, 25, 28, 37-temperature sensor, 20-control unit, 21-supply side manifold, 22-discharge side manifold, 23, 24a, 26, 27-line, 31-first temperature control valve, 32-second temperature control valve, 33-first pump, 34-second pump, 36-heat medium supply line.
Detailed Description
A hot press apparatus 11 including a plurality of hot plates 16 temperature-controlled by a heat medium according to the present invention will be described with reference to fig. 1. The hot press device 11 includes a press device 12 and a heat medium supply device 13. In the present invention, the hot press unit 11 is an entire system including the press unit 12, the heat medium supply unit 13, or the controller 20 for operating them.
The press device 12 has a plurality of hot plates 16 as heated portions disposed between an upper fixed plate 14 and a lower movable plate 15. A ram 17a of a pressing cylinder 17 operated by a hydraulic structure is fixed to the lower side of the lower movable plate 15, and the hot plate 16 fixed to the lower movable plate 15 is lifted by lifting the ram 17 a. Further, as the heat plate 16 is further raised, the intermediate heat plate 16 may also be raised toward the heat plate 16 fixed to the upper fixing plate 14. The press device 12 may be housed in the chamber 18 and press-formed in a vacuum state, but may not include a chamber.
The heat plate 16 is a plate body having flat upper and lower surfaces, and has a heat medium passage formed therein for flowing a heat medium oil. A temperature sensor 19 (thermocouple) for detecting the temperature of the heat plate 16 is provided in a metal portion of the main body of each heat plate 16, and the temperature sensor 19 is connected to a control device 20. In fig. 1, the temperature sensor 19 is omitted from only one of the heat plates 16, but the temperature sensor 19 is attached to all of the heat plates 16. The number of the hot plates 16 of the press device 12 is not limited as long as it is a plurality of hot plates, and the temperature sensor 19 may not be attached to all the hot plates 16. Alternatively, the temperature sensor 19 may be attached to both the metal part of the main body of the heat plate 16 and the heat medium flow path, or only to the heat medium flow path.
The press device 12 is provided with a supply-side manifold 21 that distributes the heat medium to the respective heat plates 16 and supplies the heat medium, and a discharge-side manifold 22 that collects the heat medium discharged from the respective heat plates 16. A pipeline 23 is connected between the supply-side manifold 21 and each hot plate 16. A pipe 24 (supply-side pipe) connected from a heat medium supply device 13 described later to the press device 12 is connected to the supply-side manifold 21. A temperature sensor 25 (thermocouple) for detecting the temperature of the heat medium is attached to the inside of the supply side manifold 21, and the temperature sensor 25 is connected to the controller 20.
Further, a pipeline 26 is connected between the discharge-side manifold 22 and each of the heat plates 16. Further, a pipe 27 (discharge side pipe) connected from the press device 12 to the heat medium supply device 13 is connected to the discharge side manifold 22. A temperature sensor 28 (thermocouple) for detecting the temperature of the heat medium is attached to the inside of the discharge side manifold 22, and the temperature sensor 28 is connected to the controller 20. In the present invention, the temperature detection on the press device 12 side may be controlled by using the temperature sensor 19 of the hot plate 16 and the temperature sensor 28 of the discharge side manifold 22, without using or without using the temperature sensor 25 of the supply side manifold 21. The temperature detection on the press device 12 side may be controlled by using only the temperature sensor 19 of the hot plate 16 without using or without using the temperature sensor 25 of the supply-side manifold 21 and the temperature sensor 28 of the discharge-side manifold 22.
Next, a schematic description of the heat medium supply device 13 will be given. The heat medium supply device 13 includes a boiler 29 (or a heating device using an electric heater) for heating the heat medium oil and a cooler 30 for cooling the heat medium oil with cooling water. The heat medium supply device 13 includes a first temperature control valve 31, a second temperature control valve 32 (three-way valve), a first pump 33, and a second pump 34 that control the distribution amount of the heat medium oil in order to control the temperature of the heat medium oil.
More specifically, the heat medium supply device 13 includes a first temperature control valve 31 in an extension of the pipe 27 from the press device 12 connected to the discharge side of the heat medium supply device 13, and is capable of controlling the supply amount of the heat medium oil to the main pipe 35 and the cooler 30. A circulation line 42 is connected to the boiler 29, and a first pump 33 and a second temperature control valve 32 for circulation are provided in the circulation line 42. The second temperature control valve 32 can control the supply amount of the heated heat transfer oil distributed from the circulation line 42 to the main line 35. On the downstream side of main line 35, the cooled heat transfer oil supplied from cooler 30 and the heated heat transfer oil supplied from boiler 29 join. Then, in the temperature raising step and the heat retention step, the heat transfer oil returned from the press device 12 and the heat transfer oil supplied from the boiler 29 are mixed to produce the heat transfer oil subjected to temperature control, which is next sent to the press device 12. In the temperature lowering step, the heat medium oil returned from the press device 12 and the heat medium oil supplied from the cooler 30 are mixed to generate the temperature-controlled heat medium oil to be fed next to the press device 12.
Therefore, the portion of the main pipe 35 through which the next temperature-controlled heat medium oil to be sent to the press unit 12 is sent in any step is referred to as a heat medium supply pipe 36 of the heat medium supply unit 13 through which the temperature-controlled heat medium oil is sent. The heat medium supply line 36 is provided with a second pump 34 for supplying the heat medium oil to the press device 12. In fig. 1, the heat medium supply line 36 for the temperature-controlled heat medium oil is shown in two lines for easy identification. In the present embodiment, a temperature sensor 37 (thermocouple) is provided in a part of the heat medium supply line 36. The temperature sensor 37 detects the temperature of the temperature-controlled heat transfer oil fed to the press device 12, and controls the temperature of the hot plate 16. In the present embodiment, a temperature sensor 37 is provided downstream of the second pump 34 for supply. However, the temperature sensor 37 may be provided in the heat medium supply line 36 upstream of the second pump 34 for supply.
The heat medium supply device 13 is further provided with an expansion tank for heat medium oil, and the like, but description thereof is omitted here. The heat medium supply device 13 is not limited to the above-described embodiment. For example, the arrangement of the boiler 29, the cooler 30, the first temperature control valve 31, and the second temperature control valve 32 may be different from the above and may be more simplified. The heat medium supply line 36 on the downstream side of the second pump 34 for supplying the heat medium oil may be provided with a temperature control valve or a branch line to control the temperature of the heat medium oil. However, in this case, the temperature sensor 37 needs to be provided downstream of the temperature control valve and the like. Further, the first temperature control valve 31 and the second temperature control valve 32 are not limited to three-way valves, and may be combined with flow rate control valves and opening/closing valves. Further, a heater for heating the heat medium may be provided in the hot plate 16. In this case, the final adjustment of the temperature of the heat medium oil supplied to the hot plate of the press device is performed on the side of the heat medium supply device provided with the cooler and the pump, and the temperature sensor is attached to the heat medium supply passage.
The temperature sensor 37 may be provided not inside the heat medium supply unit 13 but in the pipe line 24 connected from the heat medium supply unit 13 to the press unit 12. In this case, particularly when the hot press apparatus 11 has a long pipe line 24, it is preferable to provide a temperature sensor near the heat medium supply device 13 (a portion 24a indicated by two lines in fig. 1). More specifically, when the temperature sensor 37 is provided in the pipe 24, it is preferable that the temperature sensor 37 is provided within 1/5 on the heat medium supply unit 13 side with respect to the entire length of the pipe 24 from the heat medium supply unit 13 to the hot press unit 12, as an example. This is because it is preferable that the heat medium oil fed from the heat medium feeder 13 to the press unit 12 be measured as long as possible without time or temperature change.
In the present embodiment, the punching unit 12 and the heat medium supply unit 13 are separated from each other in terms of layout, and the pipe line 24 (supply-side pipe line) connected from the heat medium supply unit 13 to the punching unit 12 has a length of 5m or more. In addition, the press device 12 and the heat medium supply device 13 may be installed in different buildings, and in this case, the length of the pipe may be 20m or more. However, if the distance between the two is too long, not only the cost of piping work increases, but also it is disadvantageous in terms of thermal efficiency, and therefore, for example, it is preferably within 50 m. In this case, the pipe passage 27 from the press device 12 to the discharge side of the heat medium supply device 13 needs to have substantially the same length. At least the supply-side pipe line 24 of these pipe lines 24, 27 is preferably insulated by a heat insulating material.
Next, the control device 20 that controls the temperature of the hot plate 16 of the hot press device 11 will be described. In the present invention, the controller 20 controls the temperature of the heat plates 16 using the detection value of the temperature sensor 37 and the detection values of the temperature sensors 19, 25, and 28, the temperature sensor 37 detects the temperature of the heat medium in the heat medium supply line 36 of the heat medium supply device 13 or the heat medium in the line 24 connected from the heat medium supply device 13 to the press device 12, and the temperature sensors 19, 25, and 28 detect the temperature of the heat plates 16 of the press device 12 or the temperature of the heat medium. Functionally, the control device 20 includes an input unit 38, an output unit 39, a calculation unit 40, a storage unit 41, and the like.
The input 38 of the controller 20 is connected to the temperature sensor 37, the temperature sensor 25, the temperature sensor 19, and the temperature sensor 28, the temperature sensor 37 detects the temperature of the heat medium oil in the heat medium supply pipe 36 of the heat medium supply unit 13, the temperature sensor 25 detects the temperature of the heat medium oil in the supply side manifold 21 of the press unit 12, the temperature sensor 19 detects the temperature of the hot plate 16, and the temperature sensor 28 detects the temperature of the heat medium oil in the discharge side manifold 22. The output unit 39 of the controller 20 is connected to the first temperature control valve 31 and the second temperature control valve 32 of the heat medium supply device 13, and controls the opening degrees of the first temperature control valve 31 and the second temperature control valve 32 (three-way valves). The computing unit 40 includes a CPU and the like, is connected to the input unit 38, the output unit 39, and the storage unit 41, and performs temperature control of the hot plate 16 based on PID control described later. The storage unit includes a memory and stores molding conditions, actual measurement values, and the like associated with temperature control of the hot press apparatus 11.
The controller 20 may be provided with one controller in either the press unit 12 or the heat medium supply unit 13, or may be provided independently of the units 12 and 13. The controller 20 may be provided in any of the press unit 12, the heat medium supply unit 13, and other places as a function of the distribution, and may control the temperature of the hot press unit 11 as a whole.
Next, a method of controlling the temperature of the hot press apparatus 11 according to the present embodiment will be described. In the present invention, the final control object is the temperature of the heat plates 16 of the press unit 12, but the temperature of the heat medium oil fed from the heat medium supply unit 13 is controlled so that the temperature of the heat plates 16 is controlled to a preset temperature. More specifically, as described above, in the temperature raising step and the heat retention step, the heat carrier oil returned from the press device 12 and the heat carrier oil supplied from the boiler 29 are mixed to produce the heat carrier oil subjected to the temperature control to be sent to the press device 12 next time. The temperature of the temperature sensor 37 of the heat medium supply passage 36 fed to the press device 12 is detected and weighted, and used for the temperature rise control and the temperature maintenance control of the hot plate 16 so as to be in a preset temperature rise and temperature maintenance mode. In the temperature lowering step, the heat medium oil returned from the press device 12 and the heat medium oil supplied from the cooler 30 are mixed to generate the temperature-controlled heat medium oil to be fed next to the press device 12. Then, the temperature of the temperature sensor 37 of the heat medium supply passage 36 fed to the press device 12 is detected and weighted, and used for the temperature lowering control of the heat plates 16 so as to be in a preset temperature lowering mode. However, in the temperature raising step and the heat retention step, the heat transfer oil from the cooler 30 may be added to prevent overshoot, and in the temperature lowering step, the heat transfer oil from the boiler 29 may be similarly added.
The molding time of the hot press apparatus 11 in one cycle including the temperature raising step, the holding step, and the temperature lowering step varies depending on the molded product, and is not limited to a specific one, but may be, for example, several minutes to several hours. In the temperature raising step, the heat holding step, and the temperature lowering step, the temperature may be controlled by changing the temperature by two or more steps.
The temperature control of the hot press apparatus 11 is generally performed by PID control. As an example shown in table 3, the temperatures detected by the four temperature sensors 19, 25, 28, and 37 are weighted so as to be the ratios optimal for the respective processes or the respective temperature zones, and used for control. In the temperature raising step, the heat holding step, and the temperature lowering step, control constants of percentage% of P control (proportional control) with respect to the set temperature, time (sec) of I control (time integral control), and time (sec) of D control (derivative control) are determined for each temperature zone, and both stability and agility of response are achieved. Note that the PID control may be based on self-adjustment or control in which self-adjustment is performed.
In particular, as a characteristic of the present embodiment, the length of the pipe passage 24 connected from the heat medium supply device 13 to the press device 12 is long, and the volume of the heat medium in the pipe passage 24 is large. Therefore, as in patent document 1, responsiveness is poor in controlling the temperature control valve of the heat medium supply device by detecting only the temperature of the heat medium on the press device side. Therefore, as described as "heat medium supply device outlet (%)" in table 3, the temperature of the heat medium oil on the downstream side of the second pump 34 for supply of the heat medium supply device 13 is added to the detection value for temperature control. As described above, instead of the above, the control may be performed by detecting the heat medium oil near the heat medium supply device 13 connected to the pipe line 24 of the press device 12.
Thus, the present invention can reduce the control delay and the accompanying fluctuation in the temperature of the heat plates, which have conventionally occurred, as compared with the case where the temperature control valve (three-way valve) of the heat medium supply device is controlled by detecting only the temperature of the heat plates of the press device or the temperatures of the heat medium oil in the supply side manifold and the discharge side manifold as in patent document 1. This improves the reduction of the runout even when the length of the pipe 24 connected from the heat medium supply device 13 to the press device 12 is short, and further improves the length of the pipe 24 even when the pipe is long.
In addition, when the length of the pipe line 24 connected from the heat medium supply device 13 to the press device 12 is not particularly long, the time and temperature reduction required for conveying the heat medium oil to the hot plate 16 are small. In this case, the temperature sensor 25 of the supply-side manifold block may be eliminated, or the temperature sensor 25 may be provided but not used, and the temperature detected by the temperature sensor 19 of the hot plate 16 and the temperature detected by the temperature sensor 28 of the discharge-side manifold 22 may be used for control on the side of the press apparatus 12. Alternatively, in the press device 12, only the temperature sensor 19 that detects the temperature of the hot plate 16 may be used for control, but in this case, it is more preferable to measure the temperature of both the inlet side and the outlet side of the heat medium passage of the hot plate 16.
Next, the forming of the hot press apparatus 11 will be briefly described. First, the lower movable plate 15 is initially positioned at the lowered position, and the molded product is placed on each of the heat plates 16 by a loading/unloading device, not shown, in a state where the heat plates 16 are separated from each other and the door of the chamber 18 is also open. Then, the door of the chamber 18 is closed, the pressing cylinder 17 is operated, and the lower movable plate 15 and the respective heat plates 16 are lifted to perform mold clamping. The timing of heating the hot plate 16 is not limited, but the pump is usually operated after the mold is closed, or the pump is always operated to start the supply of the circulating heat transfer oil to the press device 12.
In the present embodiment, the supply amount (flow rate) of the heat medium oil per unit time fed from the pump of the heat medium supply device 13 to the ram device 12 is constant in the temperature increasing step, the heat holding step, and the temperature decreasing step. However, the supply amount of the heat transfer oil may be increased only at the time of temperature rise or high temperature. In addition, even in the heating and holding step, the supply amount of the heat medium oil can be reduced in the second half of the middle plate in which the temperature of the molded article coincides with the temperature of the hot plate 16. When the supply amount of the heat transfer oil is made variable, the time for the heat transfer oil to pass through the pipe line 24 is longer in the case where the supply amount is small as compared with the case where the supply amount is large. Therefore, when the amount of the heat medium oil to be supplied is small, it is considered that the weight of the control using the detection values of the temperature sensors 19, 25, and 28 in the press device 12 is increased, and therefore the following performance is deteriorated, and it is preferable to increase the weight of the control using the detection value of the temperature sensor 37 in the heat medium supply device 13.
Then, the temperatures of the temperature sensors 19, 25, 28, and 37 are detected so that the temperatures of the heat plates 16 match the set temperatures shown in fig. 2, and the second temperature control valve 32 is controlled to supply the heat medium oil from the heat medium supply device 13 to the heat plates 16 of the press unit 12. The constants of the PID control and the weighting of the detected values at this time are as shown in fig. 3. Then, the pressing cylinder 17 is pressurized as the temperature of the hot plate 16 increases, and when the heating and holding step and the temperature lowering step are completed, the supply of the heat medium oil from the heat medium supply device 13 to the press device 12 is stopped. Then, the pressing cylinder 17 is operated again, and the lower movable plate 15 and the respective heat plates 16 are lowered to open the mold. Then, the door of the chamber 18 is opened to take out the molded article.
The present invention is not limited to the above-described embodiments, but it is needless to say that the present invention can be applied to a combination of the embodiments described above and a modification of the present invention based on the gist of the present invention by a person skilled in the art. When the heat medium is steam or water, it is also preferable to control the heat medium using the heat medium supply line 36 of the heat medium supply unit 13 or the temperature sensor 37 connected from the heat medium supply unit 13 to the line 24 of the press unit 12. In the case of using steam, a scheme of using a pressure sensor as an equivalent of the temperature sensor to detect the vapor pressure and convert it into temperature is also included in the present invention.
Claims (3)
1. A hot press apparatus comprising a plurality of hot plates temperature-controlled by a heat transfer oil, characterized in that,
the heat medium supply device is provided with: a boiler or an electric heater-based heating device that heats the heat medium oil and a cooler that cools the heat medium oil using cooling water; the heat medium supply device is provided with a first temperature control valve (31), a second temperature control valve (32), a first pump (33) and a second pump (34) which are used for controlling the distribution amount of the heat medium oil in order to control the temperature of the heat medium oil; the first temperature control valve may control the supply amount of the heat medium oil to the main line and the cooler; the second temperature control valve can control the supply quantity of the heated heat transfer oil distributed from the heating device to the main pipeline;
the heat medium supply device is arranged in a building different from the punching device, the supply side pipeline of the heat medium connected with the punching device from the heat medium supply device has a length of more than 5m,
the hot press device includes:
a first temperature sensor for detecting the temperature of the heat medium oil fed to the press device, in a portion of the heat medium supply line of the heat medium supply device downstream of the first temperature control valve and the second temperature control valve or a supply side line connected from the heat medium supply device to the press device, the portion being provided within one fifth of the heat medium supply device with respect to the entire length of the supply side line;
second to fourth temperature sensors for detecting the temperature of a hot plate of the press device or the temperature of the heat transfer oil; and
the control device for controlling the temperature of the hot plate by using the detection values of the first to fourth temperature sensors weights the temperatures detected by the first to fourth temperature sensors so that the temperatures are the ratios most suitable for the respective steps or the respective temperature zones.
2. A method for controlling the temperature of a hot press apparatus having a plurality of hot plates for temperature control by a heat transfer oil, the method for temperature control of a hot press apparatus being characterized in that,
the heat medium supply device is provided with: a boiler or an electric heater-based heating device that heats the heat medium oil and a cooler that cools the heat medium oil using cooling water; the heat medium supply device is provided with a first temperature control valve (31), a second temperature control valve (32), a first pump (33) and a second pump (34) which are used for controlling the distribution amount of the heat medium oil in order to control the temperature of the heat medium oil; the first temperature control valve may control the supply amount of the heat medium oil to the main line and the cooler; the second temperature control valve can control the supply quantity of the heated heat transfer oil distributed from the heating device to the main pipeline;
the supply side pipeline of the heat medium connected with the punching device from the heat medium supply device has a length of more than 5m,
the temperature control method of the hot press device comprises the following steps:
detecting the temperature of the heat medium oil supplied to the press device using a first temperature sensor provided in a portion of the heat medium supply unit on a downstream side of the first temperature control valve and the second temperature control valve or a supply side pipe connected to the press device from the heat medium supply unit, the portion being within one fifth of the heat medium supply unit side with respect to the entire length of the supply side pipe; and
the temperature of a hot plate of a press device or the temperature of a heat transfer oil is detected by using second to fourth temperature sensors,
the temperature of the hot plate is controlled by using the detection values of the first to fourth temperature sensors, and the temperatures detected by the first to fourth temperature sensors are weighted so as to be optimal for each process or each temperature zone.
3. The temperature control method of a hot press apparatus according to claim 2,
in the press apparatus, the second to fourth temperature sensors for detecting the temperature of the heat medium are provided in the discharge side manifold, the heat plate, and the discharge side manifold, respectively, and the temperature of the heat plate is controlled without using the second temperature sensor provided in the supply side manifold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018192651A JP6845201B2 (en) | 2018-10-11 | 2018-10-11 | Hot press device and temperature control method for hot press device |
| JP2018-192651 | 2018-10-11 |
Publications (2)
| Publication Number | Publication Date |
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| CN111037989A CN111037989A (en) | 2020-04-21 |
| CN111037989B true CN111037989B (en) | 2021-08-13 |
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| CN201910920225.1A Active CN111037989B (en) | 2018-10-11 | 2019-09-26 | Hot press device and temperature control method of hot press device |
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| Publication number | Publication date |
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| JP6845201B2 (en) | 2021-03-17 |
| CN111037989A (en) | 2020-04-21 |
| JP2020059053A (en) | 2020-04-16 |
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