JP2005211917A - Method and device for controlling mold temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for controlling a mold temperature, by which the temperature of a mold is more easily controlled when controlling the temperature of the mold to stably manufacture a product of excellent quality. <P>SOLUTION: Temperature adjusting machines 5a, 5b, which circulate a temperature adjusting medium through circulation passages 11a, 11b formed in a mold 10, are electrically connected to a controller 4. The controller 4 is also electrically connected to a temperature sensor 3 disposed to the mold 10, so that the temperature of the mold is compared with a set temperature predetermined. When conducting setup of the mold, a temperature adjusting medium, whose temperature is made a preheating temperature by the temperature adjusting machines 5a, 5b, is supplied to the mold 10 to preheat the mold. After continuous casting is started, if the temperature of the mold rises to the set temperature, a signal for switching the temperature of the temperature adjusting medium is transmitted to the temperature adjusting machines 5a, 5b by the controller 4, so that the machines 5a, 5b switch the temperature of the temperature adjusting medium to a cooling temperature. Thus, the temperature of the mold is kept constant during continuous casting. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mold temperature control method and a temperature control apparatus.

  When casting a molten metal such as magnesium using a mold, if the temperature of the mold is low at the start of casting, water remains on the surface of the mold, and casting cannot be performed or high quality products cannot be manufactured. It is necessary to preheat the mold. In addition, even when continuous casting is temporarily stopped due to maintenance or troubles, the mold is cooled, and therefore it is necessary to reheat (preheat) the mold. A mold temperature control method for preheating the mold is disclosed in, for example, Japanese Patent Laid-Open No. 2001-246446 (Patent Document 1). In the technique disclosed in Patent Document 1, a fluidized bed furnace is provided in a mold, a fluidized bed such as alumina or silica is filled in the fluidized bed furnace, and temperature-controlled air is placed in the fluidized bed furnace. It is to be supplied. Thereby, a metal mold | die can be heated uniformly.

  Further, even in a mold used for blow molding or the like, it is necessary to raise the temperature of the mold to some extent before using the mold. No. 2003-200426 (Patent Document 2). In the mold temperature control method disclosed in Patent Document 2, temperature sensors are arranged on the surface and inside of the mold, respectively, and the mold is heated until the surface of the mold reaches a predetermined temperature. The temperature control of the heater is performed based on the detection result of the temperature sensor arranged on the mold surface, and if the temperature of the mold surface exceeds the predetermined temperature, the detection result of the temperature sensor arranged inside the mold is used. The temperature of the heater is controlled. Thereby, the temperature of a metal mold | die can be stabilized to preset temperature in a short time.

On the other hand, during continuous casting, it is heated by the heat from the molten metal and the temperature of the mold tends to rise. Here, since the quality of the cast product is easily influenced by the mold temperature, it is desirable to keep the temperature of the mold constant during continuous casting in order to continue producing a product with good quality stably. Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-071056 (Patent Document 3), a cooling water channel is provided in the mold, and the temperature of the mold is kept constant by supplying the cooling water to the cooling water channel. I am doing so. Further, a method for controlling the temperature of the mold during continuous use of the mold is disclosed in Japanese Patent Laid-Open No. 9-122870 (Patent Document 4). In the technique disclosed in Patent Document 4, a temperature sensor is provided on the surface of the mold, and the mold release agent is applied to the mold as a coolant until the temperature detected by the temperature sensor reaches a desired temperature. Is. Thereby, the temperature of a metal mold | die can be cooled to desired temperature, and the temperature of a metal mold | die can be kept constant at the time of continuous use of a metal mold | die.
JP 2001-246446 A Japanese Patent Laid-Open No. 2003-200426 JP 2000-071056 A JP-A-9-122870

  As described above, the mold temperature control includes temperature control for preheating the mold before continuous use of the mold (during setup) or when continuous use of the mold is interrupted (for example, during maintenance). There are two types: temperature control for keeping the temperature of the mold constant during continuous use of the mold. However, in the technique disclosed in the above-mentioned patent document, attention is paid only to temperature control of one of these. When these conventional technologies are combined, when preheating the mold, heating is performed by a heating means such as a heater, and cooling is performed to prevent the mold temperature from rising excessively during continuous use of the mold. Cooling is performed by applying a water channel or a release agent. Therefore, when the mold is set up, the mold is preheated, and when the desired temperature is reached, heating with a heater, etc. is stopped, and after continuous use of the mold is started, other cooling means are controlled to control the mold. There is a problem that mold temperature control becomes complicated because it is necessary to prevent an excessive increase in the mold temperature.

  It is an object of the present invention to provide a method and an apparatus capable of performing mold temperature control more easily when controlling the mold temperature in order to stably produce a good quality product. .

  In order to solve the above-mentioned problem, the first of the mold temperature control methods of the present invention is to arrange a temperature sensor for detecting the temperature of the mold in the mold and to exchange heat with the mold. A flow passage for circulating a temperature control medium is provided, the temperature of the mold detected by the temperature sensor is compared with a preset temperature, and the detected temperature of the mold is the setting When the temperature is lower than the temperature, the temperature of the temperature control medium flowing through the flow passage is set to a preheating temperature higher than the set temperature, and when the detected temperature of the mold is higher than the set temperature, the flow The temperature of the temperature control medium flowing through the passage is set to a cooling temperature lower than the set temperature.

  Further, the second of the mold temperature control method of the present invention for solving the above-mentioned problem is to provide a flow passage for circulating a temperature control medium for heat exchange between the mold and the mold, At the time of mold setup before continuously using the mold, the temperature of the temperature control medium is set to a predetermined preheating temperature to increase the temperature of the mold, and the temperature of the mold is the mold temperature. When the temperature rises to a usable temperature, the continuous use of the mold is started, and when the temperature of the mold is further increased by the continuous use of the mold and reaches a predetermined set temperature, The temperature of the temperature control medium flowing through the flow passage is switched to a predetermined cooling temperature, so that the temperature of the mold during continuous use is kept constant.

  Further, in order to solve the above-mentioned problem, the third of the mold temperature control method of the present invention is provided with a flow passage for circulating a temperature control medium for heat exchange between the mold and the mold, During continuous use of the mold, the temperature of the temperature control medium is set to a predetermined cooling temperature in order to keep the temperature of the mold constant, and the continuous use of the mold is interrupted and the mold is stopped. When the mold temperature drops to a predetermined set temperature, the temperature of the temperature control medium flowing through the flow passage is switched to a predetermined preheating temperature, and the mold temperature is lowered when continuous use is interrupted. It is characterized by preventing excessively.

  In the second mold temperature control method of the present invention described above, when the continuous use of the mold is interrupted and the temperature of the mold is lowered to a preset temperature, the flow passage is provided. The temperature of the temperature control medium that circulates may be switched to the preheating temperature to prevent the temperature of the mold from being excessively lowered when continuous use is interrupted.

  Furthermore, in the second and third of the mold temperature control device of the present invention, the mold is provided with a temperature sensor for detecting the temperature of the mold, and by constantly detecting the temperature of the mold, It is detected whether the temperature of the mold has reached the set temperature or the temperature of the mold has decreased to the set temperature, and based on that, the temperature of the temperature control medium is set between the preheating temperature and the cooling temperature. You may make it switch between.

  The mold temperature control device of the present invention for realizing the mold temperature control method of the present invention as described above is a temperature control for exchanging heat with the mold in a flow passage formed in the mold. A temperature control medium supply device for supplying a medium, and a cooling temperature when the temperature of the temperature control medium is cooled so that the temperature of the mold and the temperature of the mold are not excessively increased. A temperature control temperature switching device that switches between temperatures, a temperature sensor that is arranged in the mold and constantly detects the temperature of the mold, and is electrically connected to the temperature sensor and the temperature control temperature switching device, respectively In addition, the temperature of the mold detected by the temperature sensor is constantly compared with a preset temperature, and when the temperature of the mold rises to the set temperature, the temperature of the temperature control medium is Before the signal to switch from the preheating temperature to the cooling temperature A control unit for transmitting the temperature adjustment temperature switching device, and having a.

  In the mold temperature control device according to the present invention, the control device further changes the temperature of the temperature control medium from the cooling temperature to the preheating temperature when the temperature of the mold decreases to the set temperature. It is possible to transmit a signal for switching to the temperature control temperature switching device.

  In addition, as long as the metal mold | die used as object by this invention requires cooling at the time of the continuous use of the said metal mold | die, what kind of thing may be sufficient as it. For example, the metal mold | die used for casting, such as die casting and gravity casting, can be illustrated. Moreover, the metal mold | die used for resin injection molding can also be illustrated.

  In the present invention, the optimum temperature control medium can be appropriately selected depending on the operating temperature range of the mold. For example, when using a mold in a relatively low temperature range such as 100 ° C. or lower, water can be selected as the temperature control medium. On the other hand, for example, when a mold is used in a relatively high temperature range such as 100 ° C. or higher, temperature adjustment oil can be selected as the temperature adjustment medium.

  As described above, in the first mold temperature control method of the present invention, a flow path is provided in the mold to allow the temperature control medium to flow through the flow path, and the temperature of the temperature control medium is set to a preheating temperature. Since the two points of the cooling temperature are set and the temperature of the temperature adjustment medium is adjusted between the two points, the temperature adjustment of the mold becomes simple. Further, since the preheating temperature of the temperature control medium is higher than a preset temperature, the preheating time can be further shortened when preheating the mold. On the other hand, since the temperature for cooling the temperature control medium is lower than the set temperature, even if the mold is continuously heated by the raw material of the workpiece during the continuous use of the mold, the temperature of the mold Excessive rise can be prevented.

  The second and third temperature control methods according to the present invention describe the present invention from a different aspect from the first temperature control method. Conventionally, mold preheating and mold cooling have been performed separately, but in the present invention, preheating and cooling are performed by the same temperature control medium so that the mold flow passage is provided. The temperature of the supplied temperature control medium is a preheating temperature higher than the mold temperature when the mold is preheated, and a cooling temperature lower than the mold temperature when the mold is cooled. For this reason, it is not necessary to use a plurality of temperature adjustment mechanisms for preheating and cooling, and only by switching the temperature of the temperature control medium between the preheating temperature and the cooling temperature, the temperature can be changed between preheating and cooling. The mold temperature can be controlled. In addition, when the mold is preheated when the mold is set up and the mold is cooled when the mold is continuously used, the same temperature is set during the mold setup and when the mold is continuously used. Since the temperature of the mold can be controlled continuously by the adjustment mechanism (the mechanism that supplies the temperature control medium to the distribution channel of the mold), It is possible to avoid complicated temperature control. In addition, when the mold is cooled during continuous use of the mold, and when the mold is preheated during continuous use of the mold, the mold temperature is not affected even if continuous use of the mold is interrupted. Can be prevented, and it is not necessary to preheat the mold again to resume continuous use, leading to an improvement in productivity. Furthermore, the temperature control of the mold is continuously performed by the same temperature adjustment mechanism (mechanism for supplying the temperature control medium to the mold flow passage) when the continuous use of the mold is interrupted and when the mold is continuously used. Therefore, it can be avoided that the temperature control of the mold from the continuous use of the mold to the interruption of the continuous use of the mold becomes complicated.

  According to the mold temperature control apparatus of the present invention, when the temperature sensor arranged in the mold detects the mold temperature, the control apparatus compares the preset temperature with the mold temperature. Then, it is determined whether the temperature of the mold has increased / decreased to the set temperature, and it is determined whether it is necessary to switch the temperature of the temperature control medium. If it is determined that it is necessary to switch the temperature of the temperature control medium, a signal to that effect is transmitted to the temperature control temperature switching device, and the temperature of the temperature control medium is changed from the preheating temperature to the cooling temperature or the cooling temperature. Switching from temperature to preheating temperature. Since the temperature control medium is supplied to the flow passage formed in the mold, when the temperature of the temperature control medium is the preheating temperature, the mold is preheated, and the temperature of the temperature control medium is the cooling temperature. In this case, the temperature of the mold is prevented from rising excessively. Thus, by using the temperature control device according to the present invention, the above-described method according to the present invention can be carried out, and the mold temperature control for starting the continuous use of the mold from the mold setup time, It is possible to avoid the complicated temperature control of the mold from the continuous use of the mold to the continuous use interruption.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an outline of a mold temperature control apparatus 50 according to the present invention. As shown in FIG. 1, a mold temperature control device 50 includes a temperature sensor 3 disposed in a mold 10 including a fixed mold 1 and a movable mold 2, and a control apparatus electrically connected to the temperature sensor 3. 4 and temperature controllers 5 a and 5 b electrically connected to the control device 4. The temperature control devices 5a and 5b supply temperature control media to the outside, and temperature control medium supply devices 20a and 20b for recovering the temperature control media from the outside, and temperature control temperatures for switching the temperature of the temperature control media Switching devices 21a and 21b are incorporated. Of the temperature controllers 5a and 5b, the temperature control temperature switching devices 21a and 21b and the control device 4 are electrically connected.

  Here, the mold 10 composed of the fixed mold 1 and the movable mold 2 is such that a cavity is formed on the mating surface of the fixed mold 1 and the movable mold 2. In this case, casting is performed by filling the formed cavity with a molten metal such as magnesium alloy. Further, the temperature sensors 3 are individually provided for each of the fixed mold 1 and the movable mold 2, and the temperatures of the fixed mold 1 and the movable mold 2 can be individually detected.

  The fixed mold 1 and the movable mold 2 are formed with flow passages 11a and 11b through which a temperature adjusting medium for adjusting the temperature of the mold 10 flows. In this embodiment, since the mold 10 used for casting is targeted, the temperature adjustment medium is temperature adjustment oil whose temperature is adjusted in a range of 100 ° C. or more, for example. A flow path 11 a is formed in the fixed mold 1, and a flow path 11 b is formed in the movable mold 2. Pipes 12a and 12a are connected to the entrances and exits of the flow passage 11a formed in the fixed mold 1, and the other ends of the pipes 12a and 12a are connected to the temperature control medium supply device 20a of the temperature controller 5a. . The temperature control medium supply device 20a is formed with a temperature control medium supply port 13a for supplying the temperature control medium from the temperature control medium supply device 5a and a temperature control medium recovery port 13b for recovering the temperature control medium from the circulation passage 11a. One piping 12a is connected to the temperature control medium supply port 13a, and the other piping 12a is connected to the temperature control medium recovery port 13b. On the other hand, pipes 12b and 12b are respectively connected to the entrance and exit of the flow passage 11b formed in the movable mold 2, and the other ends of the pipes 12b and 12b are connected to the temperature control medium supply device 20b of the temperature controller 5b. ing. The temperature control medium supply device 20b includes a temperature control medium supply port 14a for supplying a temperature control medium from the temperature control medium supply device 5b, and a temperature control medium recovery port 14b for recovering the temperature control medium from the circulation passage 11b. One piping 12b is connected to the temperature control medium supply port 14a, and the other piping 12b is connected to the temperature control medium recovery port 14b.

  The temperature control temperature switching devices 21a and 21b can exemplify devices capable of switching the temperature of the temperature control medium between at least two points by water cooling, air cooling, heater control, and the like and combinations thereof.

  As described above, the temperature controllers 5a and 5b supply the temperature control medium to the flow passages 11a and 11b via the pipes 12a and 12b, and flow the temperature control medium into the flow passages 11a and 11b. , 11b is used to collect the temperature control medium flowing through the pipes 12a, 12b. Further, before the temperature control medium is supplied to the flow passages 11a and 11b (or after the temperature control medium is recovered from the flow passages 11a and 11b), the temperature of the temperature control medium is desired by the temperature control temperature switching devices 21a and 21b. The temperature of the temperature control medium can be maintained at that temperature.

  The control device 4 is based on an input port that receives an electrical signal from the temperature sensor 3, a storage unit that stores a reference set temperature for switching the temperature of the temperature control medium, and an electrical signal input from the input port. The actual temperature of the mold is compared with the set temperature to determine whether the actual mold temperature has increased or decreased to the set temperature, and when the mold temperature has increased to the set temperature When a signal indicating that the temperature of the temperature adjustment medium is switched from the preheating temperature to the cooling temperature is transmitted to the temperature adjusters 5a and 5b, and the mold temperature is lowered to the set temperature, the temperature adjusters 5a and 5b are And an output port for transmitting a signal for switching the temperature of the medium from the cooling temperature to the preheating temperature. The set temperature stored in the storage unit of the control device 4 needs to be determined in advance in consideration of the actual mold temperature during continuous casting, the preheating time when setting up the mold, and the like. There is.

  In the present embodiment, temperature controllers 5a and 5b are provided for the flow passages 11a and 11b formed in the fixed mold 1 and the movable mold 2, respectively, and the temperatures of the fixed mold 1 and the movable mold 2 are set as individual temperatures. It can be adjusted by adjusting the machine. Thereby, even if the temperature of the fixed mold 1 and the movable mold 2 is different, temperature control suitable for each mold can be performed. For example, when the heat capacities of the fixed mold 1 and the movable mold 2 are different, the optimum preheating temperature and cooling temperature required for the temperature control medium are also different. Temperature and cooling temperature can be set individually. In this case, the storage unit of the control device 4 stores optimum set temperatures for each of the fixed mold 1 and the movable mold 2, and the calculation unit is a temperature arranged in each of the fixed mold 1 or the movable mold 2. The mold temperature of the fixed mold 1 or the movable mold 2 detected by the sensor 3 is individually compared with the set temperature set for each mold.

  The fixed mold 1 and the movable mold 2 are provided with a plurality of temperature sensors 3 at a plurality of locations, and all the temperature sensors 3 are electrically connected to the control device 4. Thereby, in each of the fixed mold | type 1 and the movable mold | type 2, by measuring the temperature in a several different location, the dispersion | variation in metal mold | die measurement temperature can be suppressed. For example, for each of the fixed mold 1 and the movable mold 2, an average value of the detected temperatures by the plurality of temperature sensors 3 is obtained, and the average value is regarded as a measured temperature of the mold, whereby the temperature between different portions of the mold is determined. It is possible to suppress the variation in temperature from adversely affecting the temperature control.

  Next, a mold temperature control method using the temperature control device 50 as described above will be described with reference to FIG. Specifically, the mold 10 is a casting mold, and a case where the mold temperature is controlled by using temperature control oil as a temperature control medium will be described. In FIG. 2, the dotted line indicates the time change of the measured temperature of the mold detected by the temperature sensor 3, and the solid line indicates the supply to the flow passages 11 a and 11 b of the mold 10. It is a time change of the temperature of the temperature control medium. First, at the time of mold setup, a temperature control medium is supplied to the mold 10 by operating the temperature controllers 5a and 5b, and the mold 10 is preheated. At this time, since the temperature of the mold is lower than the preset temperature T3, the temperature of the temperature control medium is set to the preheating temperature T1 higher than the preset temperature T3. More specifically, the temperature control set temperature of the temperature control temperature switching devices 21a and 21b is set to the preheating temperature T1. The preheating temperature T1 is set to a temperature as high as possible so that the mold 10 is heated so that no moisture remains in the mold 10, and the preheating time is shortened as high as possible. Is set. When the temperature control medium is set to the preheating temperature T1, it is at the time of mold setup, so the temperature control temperature switching devices 21a and 21b of the temperature controllers 5a and 5b are operated in advance to set the temperature control set temperature for preheating. The temperature may be set, or the temperature of the mold 10 may be detected by the temperature sensor 3, and then the preheating temperature T <b> 1 may be reset by the control device 4.

  When the mold 10 is preheated by the temperature control medium, the mold temperature rises to a castable temperature T4. After the temperature of the temperature control medium reaches the castable temperature T4, continuous casting is started when a predetermined time elapses. When continuous casting is started, casting of a plurality of cycles is performed, and the temperature of the mold 10 is increased by the heat of the molten metal supplied into the mold for each cycle. At this time, since the temperature of the temperature control medium is set to the preheating temperature T1, the temperature of the mold 10 continues to rise.

  When the temperature of the mold 10 detected by the temperature sensor 3 reaches a temperature control temperature switching temperature (set temperature) T3 determined in advance, the control device 4 sends the temperature control medium 5a, 5b to the temperature control medium. A signal for switching the temperature from the preheating temperature T3 to the cooling temperature T2 is transmitted, and the temperature adjustment set temperature of the temperature adjustment temperature switching devices 21a and 21b is set to the cooling temperature T2. At this time, the temperature adjustment set temperature of the temperature adjustment temperature switching devices 21a and 21b is set to the cooling temperature T2, but since the temperature adjustment medium is cooled by the temperature adjusters 5a and 5b from this point of time, The temperature of the temperature control medium does not change suddenly, and a slight deviation occurs until the temperature reaches the cooling temperature. Since the temperature of the temperature control medium is lowered after the temperature of the temperature control medium is set to the cooling temperature, the temperature rise of the mold is saturated. And even if the heat flowing into the molten metal and the heat flowing out of the molten metal reach an equilibrium gradually, and the heat from the molten metal continues to flow into the mold 10 by continuous casting, the temperature of the mold 10 is the temperature during continuous casting. It becomes constant at T5. During the subsequent continuous casting, the temperature of the temperature control medium remains set at the cooling temperature T2, and after the temperature of the temperature control medium decreases to the cooling temperature T2, the cooling is performed while continuous casting is performed. The service temperature T2 is maintained. Thereby, the temperature of a metal mold | die is kept constant at the time of continuous casting, and the excessive raise of metal mold | die temperature is suppressed.

  Next, for example, when continuous casting is interrupted for reasons such as maintenance of the mold, the flow of heat from the molten metal stops, so the temperature of the mold 10 decreases. Here, when continuous casting continues to be interrupted and the temperature of the mold 10 decreases to the set temperature T3, the temperature of the temperature control medium from the controller 4 to the temperature adjusters 5a and 5b is changed from the cooling temperature T2 to the preheating temperature T1. A signal for switching is transmitted, and the temperature control set temperature of the temperature control temperature switching devices 21a and 21b is set to the preheating temperature T2. At this time, the temperature adjustment set temperature of the temperature adjustment temperature switching devices 21a and 21b is set to the preheating temperature T2, but since the temperature adjustment medium is heated by the temperature adjusters 5a and 5b from this point of time, The temperature of the temperature control medium does not change suddenly, and a slight deviation occurs until the temperature reaches the preheating temperature. When the temperature of the temperature control medium is set to the preheating temperature T1, the temperature drop of the mold 10 is suppressed, and is kept constant at a temperature equivalent to the castable temperature T4 at the time of setup. Therefore, when casting is resumed, the mold 10 need not be preheated again.

  As described above, in the present embodiment, when the mold is set up, the temperature adjustment medium set to the preheating temperature is supplied to the mold, and the mold temperature rises to a predetermined set temperature by continuous casting. In addition, the temperature of the temperature control medium is switched to the cooling temperature to suppress an excessive temperature rise of the mold during continuous casting, and the temperature control is performed when the continuous casting is interrupted and the mold temperature drops to the set temperature. The temperature of the medium is switched to the preheating temperature so that the mold is preheated when the continuous casting is interrupted, and the temperature control of the mold when the continuous casting is interrupted or the continuous casting is interrupted is complicated. Can be suppressed.

The figure explaining the temperature control apparatus of the metal mold | die concerning this invention. The figure explaining the temperature control method of the metal mold | die concerning this invention.

Explanation of symbols

1 Fixed mold (mold)
2 Moving type (mold)
DESCRIPTION OF SYMBOLS 3 Temperature sensor 4 Control apparatus 5 Temperature controller 10 Mold 11a, 11b Flow path 20a, 20b Temperature control medium supply apparatus 20a, 20b Temperature control temperature switching apparatus 50 Temperature control apparatus

Claims (7)

A temperature sensor that detects the temperature of the mold is disposed in the mold, and a flow passage is provided for circulating a temperature control medium that exchanges heat with the mold, and the mold is detected by the temperature sensor. When the mold temperature is compared with a predetermined set temperature, and the detected temperature of the mold is lower than the set temperature, the temperature of the temperature control medium flowing through the flow passage is set higher than the set temperature. When the detected temperature of the mold is higher than the set temperature, the temperature of the temperature control medium flowing through the flow passage is set to a cooling temperature lower than the set temperature. A mold temperature control method characterized by the above. A flow passage is provided in the mold to distribute a temperature control medium that exchanges heat with the mold, and the temperature of the temperature control medium is determined in advance when the mold is set up before the mold is used continuously. When the temperature of the mold rises to a temperature at which the mold can be used by increasing the temperature of the mold by setting the temperature for preheating, the continuous use of the mold is started. When the temperature of the mold further rises due to continuous use and reaches a predetermined set temperature, the temperature of the temperature control medium flowing through the flow passage is switched to a predetermined cooling temperature to continuously use the mold. A mold temperature control method characterized in that the mold temperature is kept constant at the time. When the continuous use of the mold is interrupted and the temperature of the mold is reduced to a predetermined set temperature, the temperature of the temperature control medium flowing through the flow passage is switched to the preheating temperature, and the continuous use is interrupted. 3. The mold temperature control method according to claim 2, wherein the temperature of the mold at the time is prevented from excessively decreasing. The mold is provided with a flow passage for circulating a temperature control medium that exchanges heat with the mold, and during continuous use of the mold, the temperature control medium is maintained in order to keep the temperature of the mold constant. The temperature is set to a predetermined cooling temperature, and when the continuous use of the mold is interrupted and the temperature of the mold is lowered to a predetermined set temperature, the temperature control that circulates through the distribution passage. A mold temperature control method, wherein the temperature of a mold is switched to a predetermined preheating temperature to prevent the temperature of the mold from being excessively lowered when continuous use is interrupted. The mold is provided with a temperature sensor for detecting the temperature of the mold, and by constantly detecting the temperature of the mold, the temperature of the mold has reached the set temperature or the temperature of the mold is The temperature of the temperature control medium is switched between the preheating temperature and the cooling temperature based on detection of whether or not the temperature has decreased to a set temperature. The mold temperature control method according to Item. A temperature adjustment medium supply device for supplying a temperature adjustment medium for heat exchange with the mold to a flow passage formed in the mold, and a temperature for preheating when preheating the temperature of the temperature adjustment medium And a temperature control temperature switching device that switches between cooling temperature when cooling so that the temperature of the mold does not rise excessively, and a temperature control device that is disposed in the mold and constantly detects the temperature of the mold The temperature sensor and the temperature sensor and the temperature control temperature switching device are electrically connected to each other, and the temperature of the mold detected by the temperature sensor is constantly compared with a preset temperature, A controller that transmits a signal to the temperature control temperature switching device to switch the temperature of the temperature control medium from the preheating temperature to the cooling temperature when the temperature of the mold rises to the set temperature. A mold temperature control device characterized by that. When the temperature of the mold has decreased to the set temperature, the control device transmits a signal to the temperature control temperature switching device to switch the temperature of the temperature control medium from the cooling temperature to the preheating temperature. The mold temperature control apparatus according to claim 6, wherein the mold temperature control apparatus is one.

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