JP2020044739A - Temperature control device, computer program, and temperature control method - Google Patents

Abstract

To provide a temperature control device, a computer program, and a temperature control method capable of allowing temperature of a mold to reach a target temperature rapidly.SOLUTION: A temperature control device comprises: a first medium circulation section for circulating a first medium via a first pipeline; an object temperature detection section for detecting temperature of an object; a first medium temperature detection section for detecting temperature of the first medium; a medium target temperature calculation section for calculating a first target temperature of the first medium on the basis of the temperature of the object and the first target temperature of the object when the first medium is circulated in the first medium circulation section; and a medium temperature control section for controlling the temperature of the first medium which is circulated in the first medium circulation section on the basis of the temperature of the first medium and the first target temperature of the first medium.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a temperature control device, a computer program, and a temperature control method.

  2. Description of the Related Art A mold is used in an injection molding machine for injection molding a molded product using a synthetic resin such as plastic. The injection mold has a cavity, which is a space portion filled with the molten plastic, and a flow path for flowing a medium for controlling the mold temperature for solidifying the molten plastic. In order to improve the accuracy of a molded product, a mold temperature adjusting device that accurately adjusts the temperature of a mold to a required temperature via a medium is used.

  Patent Document 1 discloses a method in which cold water and hot water are caused to flow by switching a valve in a medium flow path provided in a mold, and hot water is caused to flow during an injection process to raise the temperature of the mold to form a skin layer. In addition, a heating and cooling device that shortens a molding cycle to be solidified by foaming and switching from hot water to cold water is disclosed.

JP-A-2003-145599

  However, in the device of Patent Document 1, when switching between hot water and cold water, hot water and cold water are alternately fed into the temporary water storage tank. However, the temperature of the mold cannot be set to the target value, and the control of the temperature of the medium is not satisfactory. For this reason, it is desired that the temperature of the mold quickly reach the set temperature (target temperature).

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a temperature control device, a computer program, and a temperature control method capable of quickly bringing a mold temperature to a target temperature.

  A temperature control device according to the present invention is a temperature control device that controls a temperature of a medium circulated to a target object through a pipe, and a first medium circulating unit that circulates the first medium through a first pipe. An object temperature detecting unit for detecting the temperature of the object, a first medium temperature detecting unit for detecting a temperature of the first medium, and a first medium circulating unit for the temperature of the object and the first medium circulating unit. A medium target temperature calculation unit that calculates a first target temperature of the first medium based on the first target temperature of the object when circulating; and a medium target temperature calculation unit that calculates the first medium temperature and the first medium temperature. A medium temperature control unit for controlling the temperature of the first medium circulated in the first medium circulation unit.

  A computer program according to the present invention is a computer program for causing a computer to control the temperature of a medium circulated to an object via a pipe, and the computer detects a temperature of the object, A process of detecting the temperature of the first medium circulated by the first medium circulating unit through the first conduit, and the temperature of the object and the object when the first medium is circulated in the first medium circulating unit Calculating a first target temperature of the first medium based on the first target temperature of the first medium, and circulating the first medium in the first medium circulating section based on the temperature of the first medium and the first target temperature of the first medium. And controlling the temperature of the medium.

  A temperature control method according to the present invention is a temperature control method for controlling a temperature of a medium circulated to an object via a pipe line, wherein the temperature of the object is detected, and a first medium circulating unit detects the temperature of the first pipe. Detecting the temperature of the first medium circulated through the path, and determining the first temperature based on the temperature of the object and a first target temperature of the object when the first medium is circulated in the first medium circulation unit. A first target temperature of the medium is calculated, and a temperature of the first medium circulated in the first medium circulation unit is controlled based on the temperature of the first medium and the first target temperature of the first medium.

  According to the present invention, it is possible to quickly reach the target temperature of the mold.

It is an explanatory view showing an example of composition of a temperature control device of this embodiment. It is a block diagram showing an example of composition of a control part. 5 is a time chart showing an example of mold temperature and electromagnetic valve opening / closing control. It is a schematic diagram which shows an example of the change of the saturated vapor pressure of a medium. 5 is a time chart illustrating an example of pressure control by a pressure control unit. It is a block diagram showing an example of temperature control of a metallic mold by a control part of this embodiment. FIG. 5 is a schematic diagram illustrating an example of calculation of a medium target temperature by a target temperature calculation unit. It is a schematic diagram which shows an example of a mode of the temperature control when raising the temperature of a metal mold to a maintenance temperature. It is a schematic diagram which shows an example of a mode of the temperature control when raising the temperature of a metal mold to a high temperature side temperature. It is a schematic diagram which shows an example of a mode of the temperature control when the temperature of a metal mold is reduced to a maintenance temperature. 6 is a flowchart illustrating an example of a processing procedure of temperature control by the temperature control device according to the present embodiment. 6 is a flowchart illustrating an example of a processing procedure of temperature control by the temperature control device according to the present embodiment. 6 is a flowchart illustrating an example of a processing procedure of temperature control by the temperature control device according to the present embodiment.

  Hereinafter, the present invention will be described with reference to the drawings showing the embodiments. FIG. 1 is an explanatory diagram illustrating an example of the configuration of the temperature control device according to the present embodiment. The temperature control device includes a temperature control unit 100, a valve unit 110, a valve controller 40, and a control unit 50. The temperature control device is a device that rapidly heats and cools the mold 60 as an object and adjusts the temperature of the mold 60.

  The temperature control unit 100 includes a maintenance temperature controller 10 as a first medium circulation unit, a high temperature temperature controller 20 as a second medium circulation unit, and a cooling temperature controller 30 as a third medium circulation unit. The maintenance temperature controller 10 circulates the first medium through the mold 60 via the pipe 11 as the first pipe. The temperature of the first medium (first target temperature) may be, for example, 60 ° C., but is not limited thereto. The high-temperature controller 20 circulates the second medium in the mold 60 via the pipe 21 as the second pipe. The temperature of the second medium (second target temperature) may be higher than the temperature of the first medium, for example, 160 ° C., but is not limited thereto. The cooling temperature controller 30 circulates the third medium through the mold 60 via the conduit 31 as the third conduit. The temperature of the third medium may be lower than the temperature of the first medium, for example, 40 ° C., but is not limited thereto. The first medium, the second medium, and the third medium do not differ from each other in the type of the medium itself, but represent different medium temperatures for convenience. The medium is, for example, water, but is not limited to water, and may be another medium such as an oil-based or alcohol-based medium.

  The maintenance temperature controller 10 includes a heater 14, a pump 16, a pressure sensor 12 for detecting pressure in a pipe 11, a temperature sensor 13 as a first medium temperature detection unit for detecting a temperature of a first medium, and water supply / cooling. An electromagnetic valve 15 and the like are provided. The pipe 11 communicates with a drain / cooling water outlet through a water / cooling solenoid valve 15. The maintenance temperature controller 10 can circulate a medium for maintaining the temperature of the mold 60 in the injection process.

  The high-temperature controller 20 includes a heater 24, a pump 26, a pressure sensor 22 for detecting the pressure of the pipeline 21, a temperature sensor 23 as a second medium temperature detecting unit for detecting the temperature of the second medium, and water supply / cooling. An electromagnetic valve 25 and the like are provided. The conduit 21 communicates with a drain / cooling water outlet through a water / cooling solenoid valve 25. The high-temperature controller 20 can circulate a medium for increasing the temperature of the mold 60 to solidify the resin (for example, a thermosetting resin) injected into the mold 60.

  The cooling temperature controller 30 includes a heat exchanger 34, a pump 36, a pressure sensor 32 for detecting the pressure of the pipe 31, a temperature sensor 33 as a third medium temperature detecting unit for detecting the temperature of the third medium, and water supply. An electromagnetic valve 35 and the like are provided. The conduit 31 communicates with a drain / cooling water outlet through a water supply electromagnetic valve 35. The cooling temperature controller 30 can circulate a medium for rapidly cooling the high-temperature mold 60. A pipe 39 is connected to a primary side of the heat exchanger 34 and communicates with a feed water / cooling water inlet and a drain water / cooling water outlet. A cooling electromagnetic valve 37 is provided in the middle of the conduit 39.

  The valve controller 40 and the valve unit 110 have a function as a switching unit. The valve unit 110 includes solenoid valves 41 to 49. The solenoid valve 41 is provided in the middle of the pipe 11 on the medium sending side (the inlet side of the mold 60). The solenoid valve 42 is provided in the middle of the medium return side of the pipe 11 (the outlet side of the mold 60). The electromagnetic valve 43 is provided in the middle of the pipe 18 communicating with the medium sending side and the medium returning side of the pipe 11. By opening the solenoid valves 41 and 42 and closing the solenoid valve 43, the maintenance temperature controller 10 circulates the first medium through the mold 60. By closing the solenoid valves 41 and 42 and opening the solenoid valve 43, the supply of the first medium to the mold 60 by the maintenance temperature controller 10 can be stopped.

  The solenoid valve 44 is provided in the middle of the pipe 21 on the medium sending side. The solenoid valve 45 is provided halfway on the medium return side of the conduit 21. The solenoid valve 46 is provided in the middle of the pipe 28 communicating with the medium supply side and the medium return side of the pipe 21. By opening the solenoid valves 44 and 45 and closing the solenoid valve 46, the high-temperature controller 20 circulates the second medium through the mold 60. By closing the solenoid valves 44 and 45 and opening the solenoid valve 46, the supply of the second medium to the mold 60 by the high-temperature controller 20 can be stopped.

  The solenoid valve 47 is provided in the middle of the conduit 31 on the medium sending side. The solenoid valve 48 is provided in the middle of the conduit 31 on the medium return side. The solenoid valve 49 is provided in the middle of the pipe 38 communicating with the medium sending side and the medium returning side of the pipe 31. By opening the solenoid valves 47 and 48 and closing the solenoid valve 49, the cooling temperature controller 30 circulates the third medium through the mold 60. By closing the solenoid valves 47 and 48 and opening the solenoid valve 49, the supply of the third medium to the mold 60 by the cooling temperature controller 30 can be stopped.

  The medium sending side of the pipes 11, 21, 31 is branched into four systems on the way, and each of the branched pipes 62 is connected to the inlet side of the mold 60. Each of the branched pipes 62 is provided with a medium feeding valve (not shown) so that the flow rate of the medium can be adjusted. Similarly, the return medium side of the pipes 11, 21, 31 is also branched into four pipes 63 at the outlet side of the mold 60, and a return valve (not shown) is provided in each of the pipes 63. Thus, the flow rate of the medium can be adjusted. A temperature sensor 65 and a pressure sensor 67 are provided on the medium sending side of the pipes 11, 21, and 31, and a temperature sensor 66 and a pressure sensor 68 are provided on the medium returning side of the pipes 11, 21, and 31. Have been. The mold 60 is provided with temperature sensors 61 as an object temperature detecting unit.

  The valve controller 40 can control the opening and closing of the solenoid valves 41 to 49 based on the control of the control unit 50.

  The valve controller 40 can select any one of the pipes 11, 21 and 31 to switch the medium circulated through the mold 60. For example, a state in which the first medium is circulated by the temperature controller for maintenance 10 (mold temperature maintaining state), a state in which the second medium is circulated by the temperature controller for high temperature 20 (mold temperature high temperature state), and a temperature control for cooling. The state in which the third medium is circulated by the machine 30 (the mold temperature cooling state) and the state in which the first medium is circulated by the maintenance temperature controller 10 (the mold temperature maintaining state) can be repeated in this order.

  Thus, when the temperature of the mold 60 is returned from the high temperature (for example, 160 ° C.) to the maintenance temperature (60 ° C.), the temperature is temporarily switched from the high-temperature temperature controller 20 to the cooling temperature controller 30, and Since the temperature of the mold 60 can be quickly cooled, the temperature of the mold 60 can quickly reach the target temperature (maintenance temperature).

  The temperature control unit 100 includes a pressure pump 70 as a pressure supply unit. The pressurizing pump 70 may be of an inverter-controlled type, or may be of a type that is not controlled by an inverter. By using the inverter control, feedback control of the discharge pressure contributes to energy saving.

  The inlet side of the pressurizing pump 70 communicates with the feed water / cooling water inlet, and a temperature sensor 74 and a pressure sensor 76 are provided on the inlet side of the pressurizing pump 70. The outlet side of the pressurizing pump 70 is connected via a check valve 73 to a bypass pipe 71 which communicates with the drainage / cooling water outlet. An on-off valve 72 is provided in the middle of the bypass pipe 71. The bypass pipe 71 communicates with the drains 11, 21 and 31 on the drain / cooling water outlet side.

  The outlet side of the pressure pump 70 communicates with the pressure pipe 77 via a check valve 73. The pressure tube 77 is provided with a pressure sensor 75. The pressure pipe 77 is branched into three, and the branched pressure pipes 77 are respectively connected to the pipe 11 (the pipe 11 between the heater 14 and the pump 16) and the pipe 21 (the pipe between the heater 24 and the pump 26). The pipe 21 communicates with the pipe 31 (the pipe 31 between the heat exchanger 34 and the pump 36). That is, a required pressure can be applied to each of the pipeline 11, the pipeline 21 and the pipeline 31 from one pressurizing pump 70 via the three pressure pipes 77.

  Thereby, for example, the temperature of the medium (for example, water) circulating in one of the pipes 11, 21, and 31 becomes high, and the medium boils unless the pressure is increased to a pressure higher than the saturated steam pressure of the medium. Even in such a case, the required pressure (pressure equal to or higher than the saturated steam pressure) can be applied to the pipeline 11, the pipeline 21 and the pipeline 31 through the pressure pipe 77 by the pressurizing pump 70, so that the medium boils. Can be prevented.

  Further, if a pressurized pump is provided in each of the pipes 11, 21 and 31, the pipes 11 and 21 may be changed depending on the pressure setting of each pressurized pump and the individual difference. And the pressure applied to the conduit 31 is different, and when the medium is switched, a pressure difference or pressure fluctuation occurs in the conduit. For this reason, there is a possibility that the medium may instantaneously boil when the medium is switched, a scale may adhere to the heater, or the pump may be damaged. In the present embodiment, since a required pressure is applied to each of the pipes 11, 21 and 31 from one pressurizing pump 70 via three pressure pipes 77, the pressure is set in the pipes when the medium is switched. The pressure can be stabilized without any difference or pressure fluctuation. Further, there is no possibility that the medium will instantaneously boil when the medium is switched, no scale will adhere to the heaters 14 and 24, and the pumps 16, 26 and 36 will not be damaged.

  FIG. 2 is a block diagram illustrating an example of the configuration of the control unit 50. The control unit 50 includes a medium temperature acquisition unit 51, a mold temperature acquisition unit 52, a pressure control unit 53, a saturated vapor pressure calculation unit 54, a storage unit 55, a target temperature calculation unit 56, a medium temperature control unit 57, and a switching time adjustment unit. 58. The medium temperature control unit 57 includes an electromagnetic valve control unit 571 and a heater control unit 572. The control unit 50 controls the operation of the temperature control device according to the present embodiment. Specifically, the opening and closing of the solenoid valves 41 to 49 is controlled via the valve controller 40 to set the temperature of the mold 60 to a desired temperature and to rapidly heat and cool the mold 60.

  FIG. 3 is a time chart showing an example of the temperature of the mold 60 and the opening / closing control of the solenoid valves 41 to 49. As shown in the upper part of FIG. 3, the temperature of the mold 60 changes among three temperatures: a low temperature (for example, room temperature), a medium temperature (maintenance temperature), and a high temperature. At a medium temperature (maintenance temperature, for example, 60 ° C.) raised from a low temperature, a step of injecting a molten resin (for example, a liquid resin) is performed, and at a high temperature (for example, 160 ° C.), the molten resin solidifies (heats). Then, the mold 60 is again maintained at the maintenance temperature, and the removal of the molded product, the injection again, and the like are repeated. Note that FIG. 3 illustrates a state where the temperature has changed from a medium temperature to a low temperature for convenience.

  At a time point before the time point t1, the solenoid valves 41, 42, 44, 45, 47, 48 are closed and the solenoid valves 43, 46, 49 are open. In this state, for example, the medium of each of the temperature controller for maintenance 10, the temperature controller for high temperature 20, and the temperature controller for cooling 30 is not circulated through the mold 60, and is maintained at a desired temperature.

  At time t1, the solenoid valves 41 and 42 are opened and the solenoid valve 43 is closed. Thereby, the maintenance temperature controller 10 circulates the first medium through the mold 60. When the temperature of the mold 60 is maintained at a desired temperature, an injection step is performed.

  At the time point t2, when the injection is completed, the solenoid valves 41 and 42 are closed, and the solenoid valve 43 is opened. At the same time, the solenoid valves 44 and 45 are opened and the solenoid valve 46 is closed. As a result, the temperature controller for maintenance 10 is switched to the temperature controller for high temperature 20, and the temperature controller for high temperature 20 circulates the second medium through the mold 60. As a result, the mold 60 is rapidly heated, and the resin is solidified.

  At time t3, when the resin solidifies, the solenoid valves 44 and 45 are closed, and the solenoid valve 46 is opened. At the same time, the solenoid valves 47 and 48 are opened and the solenoid valve 49 is closed. Thereby, the temperature controller for high temperature 20 is switched to the temperature controller for cooling 30, and the temperature controller for cooling 30 circulates the third medium through the mold 60. Thereby, the mold 60 is rapidly cooled.

  That is, when returning the temperature of the mold 60 from the high temperature (second temperature) to the maintenance temperature (first temperature), the temperature of the mold 60 is quickly cooled by temporarily switching to the cooling temperature controller 30. Therefore, the temperature of the mold 60 can quickly reach the target temperature (maintenance temperature).

  At time t4, when the temperature of the mold 60 approaches the maintenance temperature, the solenoid valves 47 and 48 are closed, and the solenoid valve 49 is opened. At the same time, the solenoid valves 41 and 42 are opened and the solenoid valve 43 is closed. As a result, the temperature controller for cooling 30 is switched to the temperature controller for maintenance 10, and the temperature controller for maintenance 10 circulates the first medium through the mold 60. Thereby, the temperature of the mold 60 can be maintained at the maintenance temperature. When the injection molding is repeated, the same operation is repeated thereafter.

  At time t5, the solenoid valves 41 and 42 are closed, and the solenoid valve 43 is opened. As a result, the temperature of the mold 60 decreases toward room temperature.

  Next, an example in which the medium is pressurized so as not to boil will be described.

  FIG. 4 is a schematic diagram showing an example of a change in the saturated vapor pressure of the medium. In the figure, the vertical axis indicates pressure (Pa), and the horizontal axis indicates temperature (° C.). As shown in FIG. 4, the saturated vapor pressure of the medium increases with increasing temperature. For example, when the temperature of the medium increases from 100 ° C. to 160 ° C., the saturated vapor pressure also increases, so that the medium (liquid) boils as it becomes vapor.

  FIG. 5 is a time chart showing an example of pressure control by the pressure control unit 53. The upper part of FIG. 5 shows the transition of the temperature detected by the temperature sensors 13, 23, 33. The medium temperature acquiring unit 51 acquires temperature information detected by the temperature sensors 13, 23, 33, 65, and 66. The mold temperature acquisition unit 52 acquires temperature information detected by the temperature sensors 61,61. As shown in FIG. 5, it is assumed that the temperature detected by the temperature sensor 13 is constant at T1, and the temperature detected by the temperature sensor 33 is also constant at T3. The temperature detected by the temperature sensor 23 is T21 before time t11, becomes T22 at time t12, is T22 between time t12 and t13, becomes T23 at time t14, and is T23 between time t14 and t15, It is assumed that a transition has been made at time t16 as shown at T21. The maximum temperature of the medium is defined as Tmax.

  The pressure control unit 53 controls the pressure supplied by the pressurizing pump 70. The pressure control unit 53 controls the pressure of the medium circulating in the pipeline 11, the pipeline 21, and the pipeline 31 to be equal to or higher than the saturated vapor pressure corresponding to the highest temperature among the boiling temperatures. For example, assuming that the saturated vapor pressure corresponding to the maximum temperature Tmax of the medium is Pmax, the pressure control unit 53 can control the pressure to be equal to or higher than Pmax. Accordingly, the medium can be prevented from boiling regardless of the temperature of each medium circulated by the temperature controller for maintenance 10, the temperature controller for high temperature 20, and the temperature controller for cooling 30.

  Further, the pressure control unit 53 can control the pressure to be equal to or higher than the saturated vapor pressure corresponding to the highest temperature among the temperatures of the respective media detected by the temperature sensors 13, 23, and 33. For example, assuming that the highest temperature among the temperatures detected by the temperature sensors is T22, the pressure control unit 53 can control the pressure to be equal to or higher than the saturated vapor pressure P22 corresponding to the temperature T22. Accordingly, the medium can be prevented from boiling regardless of the temperature of the medium circulated by the temperature controller for maintenance 10, the temperature controller for high temperature 20, and the temperature controller for cooling 30.

  The saturated vapor pressure calculator 54 has a function as a calculator, and repeats the maximum saturated vapor pressure among the saturated vapor pressures of the respective media based on the temperatures of the respective media repeatedly detected by the temperature sensors 13, 23, 33. calculate. In this case, the saturated vapor pressure corresponding to the highest temperature among the temperatures detected by the temperature sensors 13, 23, 33 may be calculated, and the saturated vapor pressure corresponding to each temperature detected by the temperature sensors 13, 23, 33 may be calculated. The maximum saturated vapor pressure may be calculated.

  The pressure controller 53 can control the pressure to be equal to or higher than the maximum saturated vapor pressure according to the transition of the maximum saturated vapor pressure calculated by the saturated vapor pressure calculator 54. As shown in FIG. 5, assuming that the calculated saturated vapor pressure changes as P21, P22, P23, and P21 according to the change in the temperature of the temperature sensor 23, the pressure controller 53 changes the maximum saturated steam The pressure can be controlled to be equal to or higher than the pressure. By changing the maximum saturated vapor pressure according to the temperature of the medium, for example, it is not necessary to constantly apply a pressure equal to or higher than a predetermined maximum saturated vapor pressure, and the pressure to be applied can be changed according to the maximum saturated vapor pressure. It is not necessary to apply unnecessary pressure more than necessary, and the safety of the device can be improved.

  Further, when the pressures in the pipes 11, 21 and 31 are reduced, the pressure can be reduced through the bypass pipe 71 by opening the on-off valve 72 without stopping the pressurizing pump 70. Further, since water can be circulated, the temperature of the pressure pipe 77 can be prevented from rising.

  Next, a method of controlling the temperature of the mold 60 by the temperature control device of the present embodiment will be described.

  In general, the temperature control of the mold does not control the mold temperature itself, but controls the medium temperature to the set temperature, and as a result, sets the temperature of the temperature-controlled mold to a desired temperature. This is done in a way that is close to However, when the temperature of the mold is changed due to the response characteristic to the temperature of the mold (for example, the time constant of the temperature is large), even if the medium temperature is changed, the temperature response due to the temperature response characteristic of the mold causes the temperature change. A delay occurs, a large temperature difference occurs between the medium temperature and the mold temperature, and it is difficult and time-consuming to set the mold temperature to a desired temperature. Further, if the feedback control of the medium temperature is strengthened to complement the temperature response characteristics of the mold, there is a possibility that a transient overshoot or undershoot may occur. Hereinafter, the present embodiment will be described.

  The target temperature calculating section 56 has a function as a medium target temperature calculating section, and detects the temperature of the mold (detected temperature) detected by the temperature sensor 61 and the case where the first medium is circulated by the maintenance temperature controller 10. The first medium target temperature of the first medium is calculated based on the first mold target temperature of the mold 60.

  The medium temperature control unit 57 controls the temperature of the first medium circulated by the maintenance temperature controller 10 based on the first medium temperature (return medium temperature) detected by the temperature sensor 66 and the first medium target temperature.

  FIG. 6 is a block diagram illustrating an example of temperature control of the mold 60 by the control unit 50 according to the present embodiment. As shown in FIG. 6, the temperature control by the control unit 50 uses a control method having a multi-loop configuration (also referred to as cascade control). As shown in FIG. 6, the target temperature calculator 56 calculates the medium target temperature based on the mold temperature (the temperature detected by the temperature sensor 61) and the mold target temperature. The medium temperature control unit 57 heats the medium by the heaters 14 and 24 or supplies and cools water based on the medium target temperature calculated by the target temperature calculation unit 56 and the medium temperature (return medium temperature detected by the temperature sensor 66). The medium is cooled by opening the solenoid valves 15 and 25. Specifically, the solenoid valve control unit 571 controls opening and closing of the water supply / cooling solenoid valves 15 and 25, and the heater control unit 572 controls on / off of the heaters 14 and 24. As a result, the medium temperature changes according to the response characteristics of the medium, and when the medium temperature changes, the temperature of the mold 60 changes according to the response characteristics of the mold 60.

  In the present embodiment, the first medium target temperature of the first medium is calculated based on the detected temperature of the mold 60 and the first mold target temperature of the mold 60 as in the above-described configuration. Since the temperature is made to approach the calculated first medium target temperature, for example, the first medium target temperature of the first medium can be sequentially changed in consideration of the temperature response characteristics of the mold 60. Thus, the temperature of the mold 60 can be quickly brought close to the first mold target temperature and maintained at the first mold target temperature without causing transient overshoot or undershoot.

  FIG. 7 is a schematic diagram illustrating an example of calculation of the medium target temperature by the target temperature calculation unit 56. 7, the upper diagram shows the temperature difference between the mold temperature and the mold target temperature, the solid line shows the case where the mold temperature is higher than the mold target temperature, and the broken line shows that the mold temperature is the mold target temperature. It shows the case where it is lower than. The lower diagram shows a calculation example of the medium target temperature.The solid line shows the medium target temperature when the mold temperature is higher than the mold target temperature, and the broken line shows the medium when the mold temperature is lower than the mold target temperature. Indicates the target temperature.

  The target temperature calculation unit 56 calculates a lower medium target temperature as the temperature difference between the mold temperature indicated by the solid line and the mold target temperature increases, and calculates the temperature difference between the mold target temperature and the mold temperature indicated by the broken line. The larger the medium is, the higher the target medium temperature is calculated. That is, when the mold temperature is higher than the mold target temperature, the target temperature calculation unit 56 calculates a lower medium target temperature as the temperature difference between the mold temperature and the mold target temperature increases, and calculates the target temperature of the mold. When the temperature is lower than the mold target temperature, the higher the medium difference between the mold target temperature and the mold temperature, the higher the medium target temperature is calculated.

  As shown in FIG. 7, when the mold temperature is higher than the mold target temperature, the medium target temperature is set lower as the absolute value of the temperature difference between the mold temperature and the mold target temperature increases. For example, when the temperature difference between the mold temperature and the mold target temperature is ΔT1, the medium target temperature is T11, and when the temperature difference between the mold temperature and the mold target temperature is ΔT2 (<ΔT1), The medium target temperature is T12 (> T11). Thereby, the temperature of the medium can be quickly reduced so that the temperature of the mold 60 quickly decreases to the mold target temperature.

  When the mold temperature is lower than the mold target temperature, the medium target temperature is set to a higher temperature as the absolute value of the temperature difference between the mold temperature and the mold target temperature increases. For example, when the temperature difference between the mold temperature and the mold target temperature is ΔT3, the medium target temperature is T13, and when the temperature difference between the mold temperature and the mold target temperature is ΔT4 (<ΔT3), The medium target temperature is T14 (<T13). Thus, the temperature of the medium can be quickly increased so that the temperature of the mold 60 quickly rises to the mold target temperature. This allows the temperature of the mold 60 to quickly reach the target temperature.

  Next, temperature control when switching the medium supplied to the mold 60 will be described.

  FIG. 8 is a schematic diagram showing an example of a state of temperature control when the temperature of the mold 60 is raised to the maintenance temperature. In the figure, the vertical axis indicates temperature, and the horizontal axis indicates time. FIG. 8 shows a case where the temperature of the mold 60 is raised from room temperature to a maintenance temperature (for example, 60 ° C.). The solid line shows the transition of the medium temperature, and the broken line shows the transition of the mold temperature. At time t21, the maintenance temperature controller 10 is turned on from off. The high temperature controller 20 and the cooling temperature controller 30 are off. Here, ON is a state in which the medium is circulated and supplied to the mold 60, and OFF is a state in which the medium is not circulated in the mold 60. Specifically, at time t21, the solenoid valves 41 and 42 are opened, and the solenoid valve 43 is closed.

  In the case of the comparative example of FIG. 8, the medium temperature is controlled so as to reach the set temperature, and as a result, the temperature of the temperature-controlled mold is approached to a desired temperature. Therefore, as shown in FIG. 8, the medium temperature approaches the mold target temperature (maintenance temperature), but the mold temperature does not reach the mold target temperature, and the medium temperature falls between the mold temperature and the mold target temperature. Continues a state where a relatively large temperature difference has occurred. That is, the relationship between the medium temperature and the mold temperature is unclear, and the mold temperature has not yet reached the target temperature even though the medium temperature appears to be stable at a constant value.

  On the other hand, in the case of the present embodiment, since the medium temperature is cascade-controlled, the mold temperature reaches the mold target temperature more quickly than in the comparative example, and the mold temperature reaches the mold target temperature. Maintain stable. That is, in the present embodiment, the relationship between the medium temperature and the mold temperature is clear, and when the medium temperature is stable at a constant value, the mold temperature is also stable at substantially the same temperature.

  When the temperature of the mold 60 falls within a predetermined range including the mold target temperature, the medium temperature control unit 57 changes the temperature of the first medium (medium) detected by the temperature sensor 66 to a first medium maintenance temperature (medium maintenance temperature). Temperature) in the storage unit 55. The medium temperature control unit 57 can control the temperature of the first medium to be maintained at the first medium maintenance temperature. Conventionally, it was only possible to know how many times the temperature of the mold would be set when the medium temperature was set. However, by storing the first medium maintenance temperature, when controlling the temperature of the medium, The temperature of the medium required to bring the temperature of the mold 60 to the target temperature can be confirmed and recorded.

  The medium temperature control unit 57 controls the temperature of the first medium to the first medium maintaining temperature when the first medium is circulated by the maintenance temperature controller 10 in a mold at a predetermined temperature (for example, room temperature). Can be. That is, in the temperature raising step of raising the temperature of the mold 60 from room temperature to the first mold target temperature, it is possible to know how many times the target temperature of the medium should be set, and it is possible to realize an optimal temperature raising step. . In addition, when the molten resin (liquid) is injected into the mold 60 in the injection molding, if the temperature of the mold 60 fluctuates, the viscosity of the molten resin fluctuates. In the embodiment, since the mold 60 can be maintained at a desired temperature, the viscosity of the molten resin does not fluctuate, and the quality of the molded product can be prevented from deteriorating.

  FIG. 9 is a schematic diagram showing an example of a state of temperature control when the temperature of the mold 60 is raised to the high temperature side. FIG. 9 shows a case where the temperature of the mold 60 is raised from the maintenance temperature to the high temperature side (for example, 160 ° C.). The solid line shows the transition of the medium temperature, and the broken line shows the transition of the mold temperature. At time t22, the maintenance temperature controller 10 is turned off from on, and the high temperature controller 20 is turned on from off. Specifically, at time t21, the solenoid valves 41 and 42 are closed, the solenoid valve 43 is opened, the solenoid valves 44 and 45 are opened, and the solenoid valve 46 is closed. Note that, even when the temperature of the mold 60 is raised to the high temperature side, the control unit 50 can use, for example, the control method illustrated in FIGS. 6 and 7.

  That is, the target temperature calculator 56 calculates the temperature of the mold (detected temperature) detected by the temperature sensor 61 and the target temperature of the second mold of the mold 60 when the second medium is circulated by the high-temperature controller 20. Is used to calculate the second medium target temperature of the second medium.

  The medium temperature control unit 57 controls the temperature of the second medium circulated by the high temperature controller 20 based on the temperature of the second medium (return temperature) detected by the temperature sensor 66 and the target temperature of the second medium.

  As described above, the second medium target temperature of the second medium is calculated based on the detected temperature of the mold 60 and the second mold target temperature of the mold 60, and the second medium temperature is calculated. Since the temperature is set close to the two-medium target temperature, for example, the second medium target temperature of the second medium can be sequentially changed in consideration of the temperature response characteristics of the mold 60. This allows the temperature of the mold 60 to quickly approach the second mold target temperature and maintain the second mold target temperature without causing transient overshoot or undershoot.

  As shown in FIG. 9, since the medium temperature is cascade-controlled, the mold temperature quickly reaches the mold target temperature, and the mold temperature is maintained while maintaining the mold target temperature. Further, in the present embodiment, the relationship between the medium temperature and the mold temperature is clear, and when the medium temperature is stable at a constant value, the mold temperature is also stable at substantially the same temperature.

  The maintenance temperature controller 10 can stand by while bypassing the first medium through the conduit 18 while maintaining the temperature of the first medium at the first medium maintenance temperature stored in the storage unit 55.

  FIG. 10 is a schematic diagram showing an example of the temperature control when the temperature of the mold 60 is lowered to the maintenance temperature. FIG. 10 shows a case where the mold 60 is rapidly cooled using the cooling temperature controller 30 when the temperature of the mold 60 is lowered from the high temperature side to the maintenance temperature. The solid line shows the transition of the medium temperature, and the broken line shows the transition of the mold temperature. At time t23, the high-temperature controller 20 is turned off from on, and the cooling-temperature controller 30 is turned on from off. Specifically, at time t23, the solenoid valves 44 and 45 are closed, the solenoid valve 46 is opened, the solenoid valves 47 and 48 are opened, and the solenoid valve 49 is closed.

  The valve controller 40 switches from the third medium to the first medium at a point in time when a required time has elapsed from the point of switching from the second medium to the third medium (time t23 in the example of FIG. 10).

  The switching time adjusting unit 58 has a function as an adjusting unit, and adjusts the required time. That is, by switching the high temperature (for example, 160 ° C.) second medium circulating in the mold 60 to the third medium for cooling (for example, the temperature is 40 ° C.), the mold 60 in the high temperature state is rapidly cooled. can do.

  When the required time adjusted by the switching time adjusting unit 58 has elapsed, the valve controller 40 switches the third medium for cooling circulating in the mold 60 to the first medium for the maintenance temperature, and Can be maintained at the first mold target temperature. Thus, the temperature of the mold 60 can be quickly brought close to the first mold target temperature and maintained at the first mold target temperature without causing transient overshoot or undershoot.

  Next, a method of adjusting the required time will be described.

  In FIG. 10, at time t31, it is assumed that the temperature detected by the temperature sensor 61 has reached or approached the first mold target temperature, and the cooling temperature controller 30 Suppose you switched to The switching time adjustment unit 58 stores the temperature (first temperature, for example, represented by T) of the mold 60 at the time point t31 in the storage unit 55. In this case, it is assumed that a peak (maximum temperature) of the temperature detected by the temperature sensor 61 appears as indicated by a symbol A after time t31. The temperature peak indicated by the symbol A is represented by (T + ΔT). The switching time adjustment unit 58 stores the temperature peak (T + ΔT) of the mold 60 in the storage unit 55.

  In the next cycle of the injection molding, the high temperature (for example, 160 ° C.) circulating through the mold 60 is switched again to the third medium for cooling (for example, the temperature is 40 ° C.), so that the high temperature state is obtained. Is rapidly cooled. In this case, the switching time adjustment unit 58 adjusts the required time based on the temperature T stored in the storage unit 55 and the peak (T + ΔT).

  For example, at a time point t31 when the temperature of the mold 60 in the cooling state in which the third medium for cooling circulates reaches T (for example, 60 ° C.), the valve controller 40 switches the third medium from the third medium to the first medium for maintaining temperature. Suppose you switch. Thereafter, it is assumed that the temperature of the mold 60 has reached a maximum temperature (T + ΔT) (for example, 65 ° C.). In this case, the switching time adjustment unit 58 needs the next switching time from the third medium to the first medium to be the time point t33 when the temperature of the mold becomes (T−ΔT) (that is, 55 ° C.). Adjust the time. As a result, as shown by the symbol C, the temperature of the mold 60 is quickly brought close to the first mold target temperature without causing transient overshoot or undershoot, and the first mold target temperature is brought to the first mold target temperature. Can be maintained.

  Similarly, at time t32 when the temperature of the mold 60 in the cooled state in which the third medium for cooling circulates reaches T (for example, 60 ° C.), the valve controller 40 switches the first medium for maintenance temperature from the third medium. Suppose you switched to Thereafter, it is assumed that the temperature of the mold 60 has reached a minimum temperature (T−ΔT) (for example, 55 ° C.) as indicated by a reference symbol B. In this case, the switching time adjustment unit 58 sets the time required for the next switching from the third medium to the first medium to be the time t33 when the temperature of the mold becomes (T + ΔT) (that is, 65 ° C.). adjust. As a result, as shown by the symbol C, the temperature of the mold 60 is quickly brought close to the first mold target temperature without causing transient overshoot or undershoot, and the first mold target temperature is brought to the first mold target temperature. Can be maintained.

  FIG. 11, FIG. 12, and FIG. 13 are flowcharts illustrating an example of a processing procedure of temperature control by the temperature control device according to the present embodiment. Hereinafter, for the sake of convenience, the subject of the processing will be described as the control unit 50. The control unit 50 turns on the temperature controller 10 for maintenance (S11), acquires the temperature of the mold 60 (S12), and acquires the temperature of the medium (S13). The control unit 50 calculates the medium target temperature (S14), and performs medium temperature control (S15).

  The control unit 50 determines whether or not the temperature of the mold 60 has reached the target temperature (S16). If the temperature of the mold 60 has not reached the target temperature (NO in S16), the process from step S12 onward is performed. Continue processing. When the temperature of the mold 60 has reached the target temperature (YES in S16), the control unit 50 stores the temperature of the medium (S17).

  The control unit 50 determines whether or not it is the valve switching timing (S18). If it is not the valve switching timing (NO in S18), the process of step S18 is continued. If it is the valve switching timing (YES in S18), the control unit 50 turns off the temperature controller for maintenance 10 and turns on the temperature controller for high temperature 20 (S19).

  The control unit 50 acquires the temperature of the mold 60 (S20), and acquires the temperature of the medium (S21). The control unit 50 calculates the medium target temperature (S22) and performs medium temperature control (S23).

  The control unit 50 determines whether or not the temperature of the mold 60 has reached the target temperature (S24). If the temperature of the mold 60 has not reached the target temperature (NO in S24), the process from step S20 onward is performed. Continue processing. When the temperature of the mold 60 has reached the target temperature (YES in S24), the control unit 50 stores the temperature of the medium (S25).

  The control unit 50 determines whether or not it is the valve switching timing (S26). If it is not the valve switching timing (NO in S26), the process of step S26 is continued. If it is the valve switching timing (YES in S26), the control unit 50 turns off the high-temperature temperature controller 20 and turns on the cooling temperature controller 30 (S27).

  The control unit 50 determines whether or not the required time has elapsed (S28). If the required time has not elapsed (NO in S28), the process of step S28 is continued. When the required time has elapsed (YES in S28), the control unit 50 turns off the cooling temperature controller 30 and turns on the maintenance temperature controller 10 (S29).

  The control unit 50 determines whether or not to end the processing (S30), and if not to end the processing (NO in S30), continues the processing from step S18. When ending the processing (YES in S30), control unit 50 turns off maintenance temperature controller 10 (S31) and ends the processing.

  The control unit 50 of the present embodiment can also be realized using a computer including a CPU (processor), a ROM, a RAM (memory), and the like. For example, a computer program recorded on a recording medium (for example, an optically readable disk storage medium such as a CD-ROM) can be read by a recording medium reading unit (not shown) and stored in the RAM. It may be stored in a hard disk (not shown) and stored in RAM when a computer program is executed. As shown in FIGS. 11 to 13, a computer program that defines the procedure of each processing is loaded into a RAM (memory) provided in the computer, and the computer program is executed by a CPU (processor), thereby controlling the computer. The unit 50 can be realized.

  In the above-described embodiment, the cooling temperature controller 30 has the configuration including the heat exchanger 34. However, the cooling temperature controller 30 is not limited to this, and may be the same as the maintenance temperature controller 10 or the high-temperature temperature controller 20. May be provided with a heater. Further, in the present embodiment, three temperature controllers are used, but a configuration including four temperature controllers may be used. Thereby, rapid heating and rapid cooling of the mold can be further enabled.

  A temperature control device according to the present invention is a temperature control device that controls a temperature of a medium circulated to a target object through a pipe, and a first medium circulating unit that circulates the first medium through a first pipe. An object temperature detecting unit for detecting the temperature of the object, a first medium temperature detecting unit for detecting a temperature of the first medium, and a first medium circulating unit for the temperature of the object and the first medium circulating unit. A medium target temperature calculation unit that calculates a first target temperature of the first medium based on the first target temperature of the object when circulating; and a medium target temperature calculation unit that calculates the first medium temperature and the first medium temperature. A medium temperature control unit for controlling the temperature of the first medium circulated in the first medium circulation unit.

  A computer program according to the present invention is a computer program for causing a computer to control the temperature of a medium circulated to an object via a pipe, and the computer detects a temperature of the object, A process of detecting the temperature of the first medium circulated by the first medium circulating unit through the first conduit, and the temperature of the object and the object when the first medium is circulated in the first medium circulating unit Calculating a first target temperature of the first medium based on the first target temperature of the first medium, and circulating the first medium in the first medium circulating section based on the temperature of the first medium and the first target temperature of the first medium. And controlling the temperature of the medium.

  A temperature control method according to the present invention is a temperature control method for controlling a temperature of a medium circulated to an object via a pipe line, wherein the temperature of the object is detected, and a first medium circulating unit detects the temperature of the first pipe. Detecting the temperature of the first medium circulated through the path, and determining the first temperature based on the temperature of the object and a first target temperature of the object when the first medium is circulated in the first medium circulation unit. A first target temperature of the medium is calculated, and a temperature of the first medium circulated in the first medium circulation unit is controlled based on the temperature of the first medium and the first target temperature of the first medium.

  The first medium circulation unit circulates the first medium to the object via the first conduit. The object includes, for example, a mold. The object temperature detection unit is, for example, a temperature sensor and detects the temperature of the object. The first medium temperature detector is, for example, a temperature sensor and detects the temperature of the first medium.

  The medium target temperature calculation unit is configured to determine the first medium based on the detected temperature (detected temperature) of the mold (object) and the first target temperature of the mold when the first medium is circulated in the first medium circulation unit. Is calculated. The medium temperature control unit controls the temperature of the first medium circulated in the first medium circulation unit based on the detected temperature of the first medium (the detected temperature) and the first target temperature of the first medium.

  In general, the temperature control of the mold does not control the mold temperature itself, but controls the medium temperature to the set temperature, and as a result, sets the temperature of the temperature-controlled mold to a desired temperature. This is done in a way that is close to However, when the temperature of the mold is changed due to the response characteristic to the temperature of the mold (for example, the time constant of the temperature is large), even if the medium temperature is changed, the temperature response due to the temperature response characteristic of the mold causes the temperature change. A delay occurs, a large temperature difference occurs between the medium temperature and the mold temperature, and it is difficult and time-consuming to set the mold temperature to a desired temperature. Further, if the feedback control of the medium temperature is strengthened to complement the temperature response characteristics of the mold, there is a possibility that a transient overshoot or undershoot may occur.

  In the present embodiment, as in the above-described configuration, the first target temperature of the first medium is calculated based on the detected temperature of the mold and the first target temperature of the mold, and the temperature of the first medium is calculated. Since the first target temperature of the first medium is brought close to the first target temperature, the first target temperature of the first medium can be sequentially changed in consideration of, for example, a temperature response characteristic of a mold. Thus, the temperature of the mold can be quickly brought close to the first target temperature of the mold and maintained at the first target temperature without causing transient overshoot or undershoot.

  In the temperature control device according to the present invention, when the temperature of the target object is higher than a first target temperature of the target object, the medium target temperature calculation unit may determine a temperature of the target object and a first target temperature of the target object. The larger the temperature difference is, the lower the first target temperature is calculated. If the temperature of the object is lower than the first target temperature of the object, the first target temperature of the object and the temperature of the object are calculated. The higher the temperature difference is, the higher the first target temperature is calculated.

  The medium target temperature calculation unit calculates a lower first target temperature as the temperature difference between the mold temperature and the first target temperature of the mold is larger, and calculates the first target temperature of the mold and the temperature of the mold. The higher the temperature difference is, the higher the first target temperature is calculated. That is, when the temperature of the mold is higher than the first target temperature of the mold, the larger the absolute value of the temperature difference between the temperature of the mold and the first target temperature of the mold, the larger the first target temperature of the medium. By lowering the temperature, the temperature of the medium is quickly reduced so that the temperature of the mold quickly decreases to the target temperature. When the temperature of the mold is lower than the first target temperature of the mold, the larger the absolute value of the temperature difference between the temperature of the mold and the first target temperature of the mold, the larger the first target temperature of the medium. By increasing the temperature, the temperature of the medium is quickly increased so that the temperature of the mold quickly increases to the target temperature. This allows the temperature of the mold to quickly reach the target temperature.

  The temperature control device according to the present invention, when the temperature of the target object detected by the target object temperature detection unit falls within a predetermined range including a first target temperature of the target object, the first medium temperature detection unit A storage unit that stores the detected temperature of the first medium as a first medium maintaining temperature, wherein the medium temperature control unit controls to maintain the temperature of the first medium at the first medium maintaining temperature.

  When the temperature of the mold detected by the object temperature detecting unit falls within a predetermined range including the first target temperature of the mold, the temperature of the first medium detected by the first medium temperature detecting unit is set to a first medium maintaining temperature. Is stored in the storage unit. The medium temperature control unit controls to maintain the temperature of the first medium at the first medium maintaining temperature. Conventionally, it was only possible to know how many times the temperature of the mold would be set when the medium temperature was set. However, by storing the first medium maintenance temperature, when controlling the temperature of the medium, The temperature of the medium required to bring the temperature of the mold to the target temperature can be confirmed and recorded.

  In the temperature control device according to the present invention, when the first medium circulating unit circulates the first medium through the object having a predetermined temperature, the medium temperature control unit sets the temperature of the first medium to the first medium maintaining temperature. To control.

  The medium temperature control unit controls the temperature of the first medium to the first medium maintaining temperature when circulating the first medium in the first medium circulating unit in the mold having a predetermined temperature. The predetermined temperature is, for example, room temperature. That is, in the temperature raising step of raising the temperature of the mold from room temperature to the first target temperature, it is possible to know how many times the target temperature of the medium should be set, so that an optimum temperature raising step can be realized.

  The temperature control device according to the present invention includes a second medium circulating unit that circulates a second medium that is higher in temperature than the first medium through a second pipe, and a second medium circulating unit that cools a second medium through a third pipe. A third medium circulation unit that circulates a third medium, and a switching unit that selects one of the first conduit, the second conduit, and the third conduit and switches a medium that is circulated to the object. Wherein the medium target temperature calculation unit is configured to calculate a second medium temperature based on the temperature of the object and a second target temperature of the object when the second medium is circulated in the second medium circulation unit. (2) calculating the target temperature, the medium temperature control unit, based on the second target temperature of the second medium and the temperature of the second medium, when the switching unit switches from the first medium to the second medium; Control the temperature of the

  The second medium circulation unit circulates the second medium having a higher temperature than the first medium via the second pipe. The third medium circulation unit circulates the third medium at a lower temperature than the first medium via the third conduit. For example, the first medium circulation unit circulates a medium for maintaining the temperature of the mold in the injection process, and the second medium circulation unit molds the mold for solidifying the injected resin (for example, a thermosetting resin). The medium for raising the temperature of the mold can be circulated, and the third medium circulation section can circulate the medium for rapidly cooling the high-temperature mold.

  The switching unit selects one of the first conduit, the second conduit, and the third conduit and switches the medium circulated through the mold. For example, a state in which the medium is circulated by the first medium circulating section (mold temperature maintaining state), a state in which the medium is circulated by the second medium circulating section (mold temperature high state), and a state in which the medium is circulated by the third medium circulating section The state (the mold temperature cooling state) and the state in which the medium is circulated by the first medium circulation unit (the mold temperature maintaining state) can be repeated in this order.

  The medium target temperature calculation unit calculates a second target temperature of the second medium based on the temperature of the mold and the second target temperature of the mold when the second medium is circulated in the second medium circulation unit. The medium temperature control unit controls the temperature of the second medium based on the second target temperature of the second medium and the temperature of the second medium when the switching unit switches from the first medium to the second medium.

  As described above, the second target temperature of the second medium is calculated based on the detected temperature of the mold and the second target temperature of the mold, and the second medium temperature of the calculated second medium is calculated. Since the target temperature is brought close to the target temperature, for example, the second target temperature of the second medium can be sequentially changed in consideration of the temperature response characteristics of the mold. This makes it possible to quickly bring the temperature of the mold close to the second target temperature of the mold and maintain the second target temperature without causing transient overshoot or undershoot.

  In the temperature control device according to the present invention, the switching unit is configured to switch from the third medium to the first medium at a point in time when a required time has elapsed from the point of switching from the second medium to the third medium. And an adjusting unit for adjusting the distance.

  The switching unit switches from the third medium to the first medium when a required time has elapsed from the time of switching from the second medium to the third medium. The adjustment unit adjusts the required time. That is, the medium circulating in the mold in a high-temperature state (mold temperature high-temperature state) in which the high-temperature second medium circulates is switched from the second medium to the third medium for cooling, and the mold is rapidly cooled. Can be. When the required time adjusted by the adjusting unit has elapsed, the medium circulating in the mold in the cooled state in which the third cooling medium circulates is switched from the third medium to the first medium for maintaining temperature, and The mold can be maintained at the maintenance temperature (mold temperature maintenance state). Thus, the temperature of the mold can be quickly brought close to the first target temperature of the mold and maintained at the first target temperature without causing transient overshoot or undershoot.

  In the temperature control device according to the present invention, the switching unit is configured to repeat switching from the second medium to the third medium and switching from the third medium to the first medium, and the switching unit may switch the third medium. A storage unit that stores the first temperature of the object detected by the object temperature detection unit at the time of switching from the first medium to the first medium; and a storage unit that stores the object detected by the object temperature detection unit after switching to the first medium. A storage unit that stores a maximum temperature or a minimum temperature, wherein the adjustment unit adjusts the required time based on the first temperature and a temperature difference between the first temperature and the maximum temperature or the minimum temperature.

  The switching unit repeats switching from the second medium to the third medium and switching from the third medium to the first medium. When the switching unit switches from the third medium to the first medium, the first temperature of the mold detected by the object temperature detection unit is stored in the storage unit. After switching to the first medium, the maximum temperature or the minimum temperature of the mold detected by the object temperature detection unit is stored in the storage unit. The adjusting unit adjusts the required time based on the first temperature and a temperature difference between the first temperature and the maximum temperature or the minimum temperature.

  For example, when the temperature of the mold in the cooled state in which the third medium for cooling circulates reaches T (for example, 60 ° C.), the switching unit switches from the third medium to the first medium for the maintenance temperature. . Thereafter, it is assumed that the temperature of the mold has reached a maximum temperature (T + ΔT) (for example, 65 ° C.). In this case, the adjustment unit adjusts the required time so that the next switching time from the third medium to the first medium is the time when the temperature of the mold becomes (T−ΔT) (that is, 55 ° C.). . The same applies to the minimum temperature. This makes it possible to quickly bring the temperature of the mold close to the first target temperature of the mold and maintain the first target temperature without causing transient overshoot or undershoot.

  The temperature control device according to the present invention includes a pressure supply unit that supplies a required pressure via a pressure pipe that communicates with each of the first, second, and third pipelines.

  The pressure supply unit supplies a required pressure through a pressure pipe communicating with each of the first, second, and third pipelines. That is, required pressure can be applied to each of the first, second, and third pipelines from one pressure supply unit via the three pressure pipes. The pressure supply unit is, for example, a pressure pump.

  As a result, for example, the temperature of the medium (eg, water) circulating in one of the first, second, and third pipes becomes high, and the medium must be pressurized to a pressure higher than the saturated steam pressure of the medium. Even in the case where the medium boils, the required pressure (pressure equal to or higher than the saturated steam pressure) can be applied by the pressure supply unit, so that the medium can be prevented from boiling.

  Note that at least a part of the above embodiments can be arbitrarily combined.

DESCRIPTION OF SYMBOLS 10 Temperature controller for maintenance 20 Temperature controller for high temperature 30 Temperature controller for cooling 34 Heat exchanger 35 Solenoid valve for water supply 11, 21, 31 Pipeline 12, 22, 32 Pressure sensor 13, 23, 33 Temperature sensor 14, 24 Heater 15, 25 Water supply / cooling solenoid valve 16, 26, 36 Pump 18, 28, 38 Pipe line 40 Valve controller 41, 42, 43, 44, 45, 46, 47, 48, 49 Solenoid valve 50 Control unit 51 Medium temperature Acquisition unit 52 Mold temperature acquisition unit 53 Pressure control unit 54 Saturated vapor pressure calculation unit 55 Storage unit 56 Target temperature calculation unit 57 Medium temperature control unit 571 Solenoid valve control unit 572 Heater control unit 58 Switching time adjustment unit 60 Mold 61, 65, 66 Temperature sensor 62, 63 Pipeline 67, 68 Pressure sensor 70 Pressurizing pump 71 Bypass pipe 72 On-off valve 73 Check valve 74 Temperature sensor 5,76 pressure sensor 77 the pressure tube 100 temperature control unit 110 valve unit

Claims (10)

A temperature control device for controlling the temperature of a medium circulated to an object through a pipe,
A first medium circulation unit that circulates the first medium through the first conduit;
An object temperature detection unit that detects the temperature of the object,
A first medium temperature detector that detects the temperature of the first medium;
A medium target temperature calculation unit that calculates a first target temperature of the first medium based on the temperature of the object and a first target temperature of the object when the first medium is circulated in the first medium circulation unit; ,
A medium temperature control unit that controls the temperature of the first medium circulated in the first medium circulation unit based on the temperature of the first medium and the first target temperature of the first medium. The medium target temperature calculator,
When the temperature of the object is higher than the first target temperature of the object, a lower first target temperature is calculated as the temperature difference between the temperature of the object and the first target temperature of the object is larger,
When the temperature of the object is lower than the first target temperature of the object, a higher first target temperature is calculated as the temperature difference between the first target temperature of the object and the temperature of the object increases. 2. The temperature control device according to 1. When the temperature of the target object detected by the target object temperature detection unit falls within a predetermined range including a first target temperature of the target object, the temperature of the first medium detected by the first medium temperature detection unit is set to the first medium temperature. 1 Equipped with a storage unit that stores as the medium maintenance temperature,
The medium temperature controller,
3. The temperature control device according to claim 1, wherein the temperature of the first medium is controlled to be maintained at the first medium maintenance temperature. 4. The medium temperature controller,
4. The temperature control device according to claim 3, wherein when circulating the first medium through the first medium circulating unit through the target at a predetermined temperature, the temperature of the first medium is controlled to the first medium maintaining temperature. 5. A second medium circulating unit that circulates a second medium having a higher temperature than the first medium through the second conduit;
A third medium circulating unit that circulates a third medium at a lower temperature than the first medium through a third conduit;
A switching unit that selects one of the first pipeline, the second pipeline, and the third pipeline and switches a medium circulated through the object;
The medium target temperature calculator,
Calculating a second target temperature of the second medium based on the temperature of the object and a second target temperature of the object when the second medium is circulated in the second medium circulation unit;
The medium temperature controller,
The method according to any one of claims 1 to 4, wherein when the switching unit switches from the first medium to the second medium, the temperature of the second medium is controlled based on the second target temperature of the second medium and the temperature of the second medium. The temperature control device according to claim 1. The switching unit includes:
When the required time has elapsed from the time when the second medium is switched to the third medium, the third medium is switched to the first medium when a required time elapses,
The temperature control device according to claim 5, further comprising an adjustment unit that adjusts the required time. The switching unit includes:
The switching from the second medium to the third medium and the switching from the third medium to the first medium are repeated,
A storage unit that stores a first temperature of the target object detected by the target object temperature detection unit when the switching unit switches from the third medium to the first medium;
A storage unit that stores the maximum temperature or the minimum temperature of the object detected by the object temperature detection unit after switching to the first medium,
The adjustment unit is
The temperature control device according to claim 6, wherein the required time is adjusted based on the first temperature and a temperature difference between the first temperature and the maximum temperature or the minimum temperature.   The pressure supply unit according to any one of claims 5 to 7, further comprising a pressure supply unit that supplies a required pressure via a pressure pipe that communicates with each of the first pipeline, the second pipeline, and the third pipeline. A temperature control device as described. A computer program for causing a computer to control the temperature of a medium circulated to an object through a pipe line,
On the computer,
A process of detecting the temperature of the object;
A process of detecting the temperature of the first medium circulated by the first medium circulation unit through the first pipe;
A process of calculating a first target temperature of the first medium based on a temperature of the object and a first target temperature of the object when the first medium is circulated in the first medium circulation unit;
Controlling the temperature of the first medium circulated in the first medium circulation unit based on the temperature of the first medium and the first target temperature of the first medium. A temperature control method for controlling a temperature of a medium circulated to an object through a pipe,
Detecting the temperature of the object,
The first medium circulation unit detects the temperature of the first medium circulated through the first conduit,
Calculating a first target temperature of the first medium based on the temperature of the object and a first target temperature of the object when the first medium is circulated in the first medium circulation unit;
A temperature control method for controlling a temperature of a first medium circulated in the first medium circulation unit based on a temperature of a first medium and a first target temperature of the first medium.

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