JP2016040091A - Method for operating plural injection molders for receiving supply of head medium from one temperature adjustment device and executing heat and cool molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for operating injection molders, in a system for executing heat and cool molding by combining one temperature adjustment device and plural injection molders.SOLUTION: A system (1) for executing heat and cool molding combines one temperature adjustment device (3) for supplying heat medium and plural injection molders (4). The injection molders (4) respectively acquire a current step of each of other injection molders (4, 4) via a network (8), when executing a temperature rise step for rising temperature of a mold. Then the temperature rise step is executed only when, a total number of other injection molders (4, 4) which are executing the temperature rise step and additional one injection molder does not exceed a number of injection molders which can simultaneously execute a temperature rise step which is set in the system (1). When the number exceeds the number of injection molders which can simultaneously execute a temperature rise step, after the total number of the injection molders becomes a number of the injection molders which can simultaneously execute the temperature rise step, the temperature rise step is executed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method of operating an injection molding machine that performs a heat and cool molding method. More specifically, it is composed of a plurality of injection molding machines connected to each other via a network and one temperature adjusting device for supplying a heating / cooling heat medium, and each injection molding machine serves as a temperature adjusting device. Each system is designed to perform heat-and-cool molding to obtain a molded product by requesting and receiving a supply of heat medium, thereby injecting the mold at a high temperature and injecting it to cool the mold. The present invention relates to a driving method for driving a machine.

  The injection molding machine is composed of a mold clamping device, an injection device, and the like as is well known in the art. A mold is clamped by the mold clamping device to form a cavity in the mold, and molten resin is injected into the cavity from the injection device. A molded product is obtained by injecting, waiting for the molten resin to cool and solidify, and opening the mold in the mold clamping device. So-called heat and cool molding is also well known as a molding method for obtaining a molded article having good transferability and excellent aesthetics. In the heat and cool molding, the mold is heated to a predetermined temperature, and the molten resin is injected with the temperature raised. Thereafter, the mold is cooled to solidify the molten resin to obtain a molded product. In the heat and cool molding, when the molten resin is filled into the cavity, the temperature of the mold is high, so that the fluidity of the molten resin is ensured and the cavity is filled uniformly. Then, after the molten resin is filled in the cavity, it is cooled and solidified, so that a molded product having excellent transferability can be obtained.

  In order to perform the heat and cool molding, it is necessary to supply a heating / cooling heat medium to the mold, and a temperature adjusting device for supplying the heat medium is well known. The temperature control device is provided with pipes for supplying a heating heat medium such as steam and a cooling heat medium such as cooling water, and these pipe lines are connected to a mold, and the heat medium is supplied by opening and closing a valve. It is supplied to the mold. These valves are controlled by a controller of the temperature adjusting device, and a trigger for this control is input by a contact signal from an injection molding machine. The controller of the injection molding machine sends a contact signal to the temperature adjusting device in synchronization with the molding cycle performed by the injection molding machine. The temperature adjusting device opens and closes the valve according to the contact signal and supplies the heating heat medium or the cooling heat medium to the mold. In other words, the temperature adjusting device operates according to the requirements of the injection molding machine and supplies the heat medium.

JP 2010-12682 A JP 2011-121283 A

  When performing heat and cool molding, it is common to combine one temperature adjusting device with one injection molding machine. However, Patent Document 1 describes a temperature adjusting device that can supply a heat medium to a plurality of injection molding machines. The temperature control device described in Patent Document 1 is provided with a plurality of pipelines for supplying a heat medium, and these pipelines are connected to a plurality of injection molding machines. A valve is provided in the pipeline, and a heat medium is supplied from the temperature adjusting device to the mold of each injection molding machine by a switching operation by the valve.

  Although Patent Document 2 is not directly related to the present invention, this document describes a method for adjusting the schedule of an injection process for a plurality of injection molding machines. According to Patent Document 2, a plurality of injection molding machines are connected to each other via a network and broadcast the schedule of the injection process. Each injection molding machine receives the schedule of the injection process of the other injection molding machine, and adjusts the schedule so that the injection process to be performed does not compete with the injection process of the other injection molding machine. The injection process is the process that consumes the most electric power in the molding cycle, and it is possible to prevent competition of the injection processes in a plurality of injection molding machines, so that the maximum power of the factory can be suppressed.

  When heat and cool molding is performed as in the prior art, it can be reliably performed by providing one temperature adjusting device for one injection molding machine. However, the temperature adjustment device is relatively expensive. For example, when it is desired to perform heat and cool molding with a plurality of injection molding machines, there is a problem that the cost increases if one temperature adjusting device is prepared for each injection molding machine. On the other hand, the temperature adjusting device described in Patent Document 1 can be connected to a plurality of injection molding machines by one temperature adjusting device and can cope with heat and cool molding. . However, there is no problem with the temperature adjusting device described in Patent Document 1, but even if this temperature adjusting device is adopted, the problem is not always solved. Specifically, even if a system combining a single temperature control device and a plurality of injection molding machines is configured, if these are not operated properly with each other, there will be insufficient heat medium and fluctuations in power consumption. There is a risk of growing. For example, if the heating process to supply the heat medium to the mold and raise the temperature of the mold is performed simultaneously on multiple injection molding machines without any restrictions, the flow rate restriction of the heat medium that can be supplied by the temperature control device There is a possibility of exceeding. In addition, when a large amount of heat medium is temporarily supplied in this way, the temperature of the heat medium rapidly decreases, but a large amount of electric power is required instantaneously to prevent the temperature decrease. That is, there is a problem that a shortage of the heat medium occurs or power consumption fluctuations increase.

  An object of the present invention is to provide an operation method of an injection molding machine that solves the problems as described above. Specifically, a plurality of injection molding machines and a heating medium for heating and cooling are supplied. Each of the injection molding machines requires the temperature control device to receive the supply of the heat medium, thereby raising the temperature of the mold and injecting it to cool the mold. It is an object of the present invention to provide an operation method of an injection molding machine that can suppress a heat medium shortage or a fluctuation in power consumption in a system that performs heat and cool molding.

  In order to achieve the above object, the present invention combines one temperature adjusting device for supplying a heating / cooling heat medium and a plurality of injection molding machines, and each injection molding machine requires a temperature adjusting device. The system is configured to perform heat-and-cool molding where the heat medium is supplied, the mold is heated and injected, and the mold is cooled to obtain a molded product. Connecting. The present invention is configured as a method of operating an injection molding machine in this system. Specifically, the injection molding machine obtains the current process of another injection molding machine via the network when performing the temperature raising process for raising the temperature of the mold. Then, the temperature raising step is performed only when the total number of other injection molding machines that are performing the temperature raising process plus one does not exceed the number of simultaneous temperature raising possible set in the system. When the number of units that can be simultaneously heated up is exceeded, the temperature raising process is performed after the total number of units is within the number of units that can be heated up simultaneously.

Thus, in order to achieve the above-mentioned object, the invention described in claim 1 includes a plurality of injection molding machines connected to each other via a network, and a temperature adjusting device for supplying a heating / cooling heat medium. Each of the injection molding machines is supplied with a heat medium by requesting the temperature adjusting device, thereby heat and cool molding to obtain a molded product by heating the mold and injecting it to cool the mold An operation method for operating an injection molding machine in a system that is to be implemented, wherein the injection molding machine performs another injection via a network when performing a temperature raising step for raising the temperature of a mold. Performed only when the current process of the molding machine is obtained and the total number of the other injection molding machines that are in the process of raising the temperature plus one does not exceed the number of units that can be heated at the same time set in the system If the total number exceeds, Configured as an operating method for an injection molding machine which comprises carrying out waiting to be within the same time heated possible number.
The invention according to claim 2 is composed of a plurality of injection molding machines connected to each other via a network and one temperature adjusting device for supplying a heating / cooling heat medium, each of the injection molding machines In a system that is designed to carry out heat and cool molding in which a temperature control device is requested and a heat medium is supplied, thereby heating the mold and injecting and cooling the mold to obtain a molded product. An operation method for operating an injection molding machine, wherein when the injection molding machine performs a temperature raising process for raising the temperature of a mold, the current process of the other injection molding machine and the other Each of the injection molding machines obtains the flow rate of the heat medium required during the temperature raising process, and the flow rate of the heat medium required by the injection molding machine during the temperature raising process and the flow rate of the other injection molding machine being executed. The total heat medium flow rate is set in the system. The injection molding machine is characterized in that it is carried out only when the heating medium flow rate limit for heating is not exceeded, and when it is exceeded, it is carried out after the total flow rate is within the heating medium flow rate restriction for heating. It is configured as a driving method.
According to a third aspect of the present invention, in the method of operating an injection molding machine according to the first aspect, when the injection molding machine performs a cooling process for cooling the mold, another injection molding is performed via a network. The current process of the machine is obtained, and the total number of the other injection molding machines being added to the number of the other injection molding machines that are in the process of cooling is 1 only when it does not exceed the simultaneous cooling capacity set in the system. In some cases, the operation is performed after the total number falls within the number that can be simultaneously cooled.
According to a fourth aspect of the present invention, in the method of operating an injection molding machine according to the second aspect, when the injection molding machine performs a cooling process for cooling the mold, another injection molding is performed via a network. The current process of the machine and each of the other injection molding machines obtain the heat medium flow rate required during the cooling process, and the heat medium flow rate required by the injection molding machine during the cooling process This is performed only when the total flow rate of the heat transfer medium of the other injection molding machine does not exceed the cooling heat medium flow rate limit set in the system, and when it exceeds, the total flow rate is within the cooling heat medium flow rate limit. It is comprised as an operating method of an injection molding machine characterized by carrying out after waiting.

  As described above, the present invention includes a plurality of injection molding machines connected to each other via a network and a single temperature adjustment device for supplying a heating / cooling heat medium. Injection molding in a system that is designed to perform heat and cool molding to obtain a molded product by heating the mold and injecting it to cool the mold by requesting the equipment and supplying the heat medium It is configured as an operation method for operating a machine. And when the injection molding machine performs the temperature raising process for raising the temperature of the mold, it obtains the current process of the other injection molding machine via the network, This is performed only when the total number of units plus 1 does not exceed the number of units that can be heated at the same time set in the system. Configured as follows. Therefore, the number of injection molding machines that simultaneously perform the temperature raising process in the system is limited, and it is possible to reliably prevent the heat medium supplied by the temperature adjustment device from being insufficient, and to suppress fluctuations in power consumption. According to another invention, in the same system, when the injection molding machine performs the temperature raising process for raising the temperature of the mold, the current process of the other injection molding machine and the other injection are performed via the network. Each of the molding machines obtains the flow rate of the heat medium required during the temperature raising process, and the flow rate of the heat medium required by the injection molding machine during the temperature rise process and the heat medium of the other injection molding machine that is performing the temperature rise process. Implement only when the total flow rate does not exceed the heating medium flow rate limit set in the system, and wait for the total flow rate to be within the heating medium flow rate limitation for heating. It is configured. According to the present invention, the number of injection molding machines that can simultaneously perform the temperature raising process is not limited, but the number of injection molding machines that can simultaneously perform the temperature rising process is limited by the flow rate of the heat medium that can be supplied. If it does so, when the injection molding machine from which the flow volume of the heat medium required in a temperature rising process differs is mixed, operation | movement of each injection molding machine can be scheduled efficiently. In other words, a plurality of injection molding machines that require a small flow rate of the heat medium can simultaneously perform the temperature raising step, and the efficiency becomes high. According to another invention, when the injection molding machine performs the cooling process for cooling the mold, it obtains the current process of the other injection molding machine via the network, and the other injection molding in progress of the cooling process. This is performed only when the total number of units plus 1 does not exceed the number of units that can be simultaneously cooled, which is set in the system. It is configured as follows. According to another invention, when the injection molding machine performs the cooling process for cooling the mold, the current process of the other injection molding machine and each of the other injection molding machines are cooled through the network. The flow rate of the heat medium that is sometimes required is obtained, and the flow rate of the heat medium that the injection molding machine needs in the cooling process and the total flow rate of the heat medium of the other injection molding machines that are performing the cooling process are set in the system Perform only when the cooling medium flow rate limit is not exceeded, otherwise wait until the total flow rate is within the cooling medium flow limit. In other words, with regard to these inventions, the cooling process is adjusted in a plurality of injection molding machines by limiting the number of injection molding machines that can be implemented simultaneously or by limiting the flow rate of the cooling heat medium to be supplied. . Therefore, there is no shortage of cooling heat medium, and power consumption can be prevented from fluctuating.

It is a figure which shows typically the system which concerns on embodiment of this invention which consists of one temperature control apparatus and several injection molding machines. It is a flowchart explaining the operating method of the injection molding machine which concerns on embodiment of this invention. It is a figure which illustrates typically the operating method of the injection molding machine concerning an embodiment of the invention, and is a flowchart showing the molding cycle of each injection molding machine when there are three injection molding machines.

  Hereinafter, this embodiment will be described. The present invention relates to an operation method of an injection molding machine that performs so-called heat and cool molding, but is directed to an injection molding machine belonging to a system composed of a combination of one temperature adjusting device and a plurality of injection molding machines. . First, the system 1 according to the present embodiment will be described. As shown in FIG. 1, the system 1 according to the present embodiment includes one temperature adjusting device 3 and a plurality of injection molding machines 4, 4,.

  The temperature adjustment device 3 is a device for heating and cooling the mold in so-called heat and cool molding, and is configured as is conventionally known. That is, although not shown in FIG. 1, a heating medium supply unit for supplying a heating medium for heating and heating a mold such as steam, and a mold such as cooling water are cooled. For example, a cooling heat medium supply unit for supplying a cooling heat medium. Each supply section is provided with a plurality of branches, and each branch is provided with a valve. A valve station composed of the plurality of valves is controlled by a controller of the temperature adjusting device 3. Accordingly, when a predetermined valve is opened by operating the valve station, the heat medium is supplied to the mold via the branch, and the mold is heated, heated, or cooled. The heat medium supplied to the mold is collected by the temperature adjusting device 3.

  In the present embodiment, the injection molding machines 4, 4,... Each of the injection molding machines 4, 4,... Is configured as well known in the art and is not shown in FIG. 1, but is a mold clamping device that clamps a mold, and is clamped by melting resin. And an injection device for injecting molten resin into the mold. These apparatuses are controlled by the controllers of the injection molding machines 4, 4,... So that a molding cycle is performed. Each of the molds of the injection molding machines 4, 4,... Has a pipe made up of a heating medium supply pipe, a cooling heat medium supply pipe, a discharge pipe for discharging the used heat medium, and the like. .. Are connected, and these pipe lines are connected to a valve station of the temperature adjusting device 3. Further, the controllers of the respective injection molding machines 4, 4,... And the controller of the temperature adjusting device 3 are connected by signal lines 7, 7,. The signal lines 7, 7,... Are signal lines of dry contacts that are turned ON / OFF by the controllers of the injection molding machines 4, 4,. The controller of the temperature adjusting device 3 detects a request from the injection molding machines 4, 4,... By a contact signal from the injection molding machines 4, 4,. 4,... Is supplied with a heating medium for heating or cooling. Thus, in the injection molding machines 4, 4,..., So-called heat and cool molding can be performed in which the mold is heated and heated to inject, and then the mold is cooled to obtain a molded product. In the present embodiment, these injection molding machines 4, 4,... Are connected to each other by a network 8.

  In the system 1 according to the present embodiment, the temperature adjusting device 3 has a restriction on the flow rate of the heat medium that can be supplied. That is, it is not possible to supply the heating medium for raising the temperature to the four injection molding machines 4, 4,. Each of the injection molding machines 4, 4,... Belonging to the system 1 collects process information of the other injection molding machines 4, 4,... By performing the operation method according to the embodiment of the present invention described next. Then, the timing at which each injection molding machine 4, 4,... In other words, it adjusts its molding cycle process independently. By doing so, as a result, the capacity of the temperature adjusting device 3 does not exceed, and the heel-and-cool molding can be stably performed as the entire system 1.

  Hereinafter, the operation method of the injection molding machine according to the present embodiment will be described. When heat and cool molding is performed, the injection molding machine 4 has a metering process, a mold clamping process, and an injection process, which are general molding cycles. When performing the pressure holding process, the mold opening process, and the protruding process, a heating process for heating and increasing the temperature of the mold by receiving the supply of the heat medium from the temperature adjusting device 3 in parallel with these processes, the mold A cooling step for cooling the is performed. The temperature raising process may be performed so that the temperature of the mold reaches a desired temperature at least at the time of injection, and the process start timing is the weighing process, the mold clamping process, or other processes. It may be. The cooling process may be started at least after the end of the injection process, may be started immediately before the pressure holding process, or may be started during or after the pressure holding process. In the following description, the start / end timing of the temperature raising process and the cooling process is described as being performed in a predetermined molding cycle process, but it is not necessarily performed at the described timing.

  The injection molding machine 4 according to the present embodiment operates as follows. First, the injection molding machine 4 will be described from the state in which the metering process is completed and the molten resin is metered in the injection device. As shown in FIG. 2, the injection molding machine 4 first acquires a constraint condition in step S01. The constraint condition is a condition that defines a restriction that the temperature adjusting device 3 can handle when a plurality of injection molding machines 4, 4,. In the present embodiment, the constraint condition includes the number of simultaneous injection temperature risers that is the number of injection molding machines capable of simultaneously performing the temperature raising step. The number of units capable of simultaneously raising the temperature may be defined in the controllers of the respective injection molding machines 4, 4,..., Or may be defined only in the controller of one specific injection molding machine 4. In the latter case, the other injection molding machines 4, 4,... Make inquiries to a specific one injection molding machine 4 via the network.

  When the restriction condition consisting of the number of units capable of simultaneously raising the temperature is obtained, the injection molding machine 4 determines whether or not it is possible to start a temperature raising process for heating and raising the temperature of the mold as indicated by reference numeral 10 in FIG. To check. This check is as follows. First, in step S02, a process in which the other injection molding machines 4, 4, and 4 are being executed is obtained. Specifically, the process is inquired to other injection molding machines 4, 4, and 4 by broadcasting, and the injection molding machines 4, 4, and 4 that have received this inquiry return the process currently being executed via the network. The injection molding machine 4 which inquired by this obtains information on whether or not the other injection molding machines 4, 4 and 4 are currently performing the temperature raising process. Next, if there are injection molding machines 4, 4, and 4 that are performing the temperature raising process, the number of the injection molding machines 4, 4, and 4 is counted, and 1 is added to this number to obtain the total number. If this total number exceeds the number that can be raised simultaneously, it is determined that the temperature raising process cannot be started (step S03), waits for a predetermined short time (step S04), and step S02 is repeated. On the other hand, if it is confirmed in step S03 that the total number is equal to or less than the number that can be raised simultaneously, the check process is terminated, and the temperature raising process is started in step S05. In other words, the injection molding machine 4 requests the temperature adjusting device 3 to receive the heating medium for raising the temperature. Subsequently, the injection molding machine 4 drives the mold clamping device (step S06) to clamp the mold. When it is confirmed that the mold has reached the desired temperature, the injection device is driven (step S07), and the molten resin is injected into the mold that has been clamped. After the injection process, the temperature raising process is completed (step S08). That is, the temperature adjusting device 3 is notified and the supply of the heating medium for heating is stopped.

  The injection molding machine 4 starts the cooling process in step S09. That is, the temperature adjusting device 3 is requested to receive the cooling heat medium. A pressure holding process (step S10) is performed, and when the pressure holding process is completed, a measuring process (step S11) for measuring the molten resin is performed. When the mold is cooled and the resin in the cavity in the mold is cooled and solidified, the injection molding machine 4 notifies the temperature adjusting device 3 to stop the supply of the cooling medium and complete the cooling process (step S12). . The mold clamping device is driven to open the mold, and a projecting process is performed (step S13) to obtain a molded product. In order to continue the next molding cycle, the process returns to step S02.

  In FIG. 3, a system 1 in which three units of injection molding machines A, B, and C are connected to one temperature adjusting device 3 and the number of units capable of simultaneously raising the temperature as a constraint is defined as one unit. FIG. 4 shows the state of each process when each of the injection molding machines A, B, C implements the operation method according to the present embodiment. In the injection molding machine A, when the first molding cycle is carried out, the other injection molding machines B and C do not carry out the temperature raising step, so the temperature raising step is carried out as it is. However, even if the injection molding machine B tries to perform the temperature raising process at reference numeral 12, the injection molding machine A is already performing the temperature raising process and has reached the number of units capable of simultaneously raising the temperature. When the injection molding machine A completes the temperature raising process, the injection molding machine B starts the temperature raising process and starts the mold clamping process. Similarly, even if the injection molding machine C attempts to perform the temperature raising process at reference numeral 13, the injection molding machine B is already performing the temperature raising process and has reached the number of units capable of simultaneously raising the temperature. When the injection molding machine B completes the temperature raising process, the injection molding machine C starts the temperature raising process. Thus, if each injection molding machine implements the injection molding machine operating method according to the present embodiment, it is possible to prevent the temperature raising process from concentrating and exceeding the heat medium supply capability of the temperature adjusting device 3.

  The operation method of the injection molding machine according to the present embodiment can be variously modified. In the above explanation, the limiting condition is only the number of injection molding machines that can simultaneously perform the heating process, which is the number of injection molding machines that can simultaneously perform the heating process, but simultaneous cooling that is the number of injection molding machines that can simultaneously perform the cooling process. A possible number may be provided. In this case, in the flowchart of FIG. 2, a process similar to the check process of reference numeral 10 may be provided immediately before step S09 to check whether or not the cooling process can be started. As can be easily understood by those skilled in the art, in this check, first, the current process of another injection molding machine is obtained, and the number of other injection molding machines being subjected to the cooling process is obtained. The total number is obtained by adding 1 which is the number of itself to this number, and if this total number exceeds the number that can be simultaneously cooled, it waits for a predetermined short time and checks again. On the other hand, if it falls within the number that can be simultaneously cooled, the cooling process of step S09 is started. When operated in this way, the flow rate of the cooling heat medium can also be limited, and the temperature adjusting device 3 can be operated stably.

  Other variations are possible. Specifically, the constraint condition can be modified, and for example, it can also be configured from a heating medium flow rate restriction that is a restriction on the flow rate of the heating medium that can be supplied by the temperature adjustment device 3. When the constraint conditions are set in this way, in each of the injection molding machines 4, 4,..., The flow rate of the heating medium required for the temperature raising step, that is, the required flow rate of the heating medium is defined in advance. In the flowchart of FIG. 2, when obtaining information on the current process of the other injection molding machine in step S02, the necessary heat medium flow rate of the other injection molding machine is also obtained. Then, when there is an injection molding machine that is currently in the temperature raising process, the necessary heat medium flow rates of these injection molding machines are summed, and the necessary heat medium necessary flow rate is further summed to obtain the total flow rate. If this total flow rate is within the heating medium flow rate limit for temperature increase, the temperature increasing step in step S05 may be started. As described above, when the temperature increase heating medium flow rate restriction is adopted as a constraint, when multiple injection molding machines with different heat medium flow rates are mixed, multiple injection molding machines with small heat medium flow rates are combined. Since the temperature raising step can be performed at the same time, the operation efficiency is increased. As described above, when the temperature raising heat medium flow rate restriction is adopted as the constraint condition, the cooling heat medium flow restriction may be further provided as the restriction condition. The cooling heat medium flow rate restriction is a restriction on the flow rate of the cooling heat medium that can be supplied by the temperature adjusting device 3. When the injection molding machines 4, 4,... Are operated, the cooling process may be adjusted so as not to exceed the cooling heat medium flow rate limit. That is, if there is an injection molding machine performing the cooling process, the total of the flow rate of the cooling heat medium required by these injection molding machines and the total of the cooling heat medium required by the cooling process itself. Find the flow rate. The cooling step is performed only when the total flow rate does not exceed the cooling heat medium flow rate limit.

1 System 3 Temperature Control Device 4 Injection Molding Machine 5 Pipe Line Group 7 Signal Line 8 Network

Claims (4)

A plurality of injection molding machines connected to each other through a network and one temperature adjusting device for supplying a heating / cooling heat medium, each of the injection molding machines requesting the temperature adjusting device to heat medium In an operation method of operating an injection molding machine in a system designed to carry out heat-and-cool molding in which a mold is heated by injection and cooled to thereby obtain a molded product. There,
The injection molding machine obtains the current process of the other injection molding machine via the network when carrying out the temperature raising process for raising the temperature of the mold, and the other injection molding machine that is performing the temperature raising process. Implemented only when the total number of units plus 1 does not exceed the number of units that can be simultaneously heated up in the system, and waits for the total number to be within the number of units that can be heated up simultaneously. A method for operating an injection molding machine. A plurality of injection molding machines connected to each other through a network and one temperature adjusting device for supplying a heating / cooling heat medium, each of the injection molding machines requesting the temperature adjusting device to heat medium In an operation method of operating an injection molding machine in a system designed to carry out heat-and-cool molding in which a mold is heated by injection and cooled to thereby obtain a molded product. There,
When the injection molding machine performs the temperature raising process for raising the temperature of the mold, the current process of the other injection molding machine and each of the other injection molding machines are required during the temperature raising process via the network. The flow rate of the heat medium is obtained, and the flow rate of the heat medium required by the injection molding machine in the temperature raising process and the total flow rate of the heat medium of the other injection molding machine during the temperature raising process are set in the system. The injection molding machine is characterized in that it is carried out only when it does not exceed the heating medium flow rate restriction for heating, and when it exceeds, it waits for the total flow rate to be within the heating medium flow restriction for heating. Method.   2. The method of operating an injection molding machine according to claim 1, wherein the injection molding machine obtains a current process of another injection molding machine via a network when performing a cooling process for cooling the mold, and cools the mold. This is performed only when the total number of the other injection molding machines in process is one plus the number of simultaneous cooling units set in the system, otherwise the total number can be cooled simultaneously. An operation method of an injection molding machine, which is carried out after waiting for the number to be within the number.   3. The method of operating an injection molding machine according to claim 2, wherein when the injection molding machine performs the cooling process for cooling the mold, the current process of the other injection molding machine and the other process are performed via a network. Each of the injection molding machines obtains the flow rate of the heat medium required during the cooling process, and the flow rate of the heat medium required by the injection molding machine during the cooling process and the heat medium of the other injection molding machine during the cooling process. Performed only when the total flow rate does not exceed the cooling heat medium flow rate limit set in the system, and waits until the total flow rate falls within the cooling heat medium flow rate limit. The operation method of the injection molding machine.

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