Injection molding machine, control device and program

Abstract

To control a supply of a molding material based on an amount of the molding material used in a molding cycle of a molded product to suppress the supply of unnecessary molding material, in a manufacturing process of the molded product using an injection molding machine.SOLUTION: A control device that controls a supply of a molding material to an injection device that injects the molding material into a mold for a molded product sets a pre-stop execution count, which is the number of molding cycles to be performed before stopping this molding cycle, based on the number of molding cycles of the molded product that can be performed using the molding material held in the injection device, and stops supply of the molding material to the injection device at a point that is the pre-stop execution count, going back from the time when this molding cycle was stopped.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to an injection molding machine, a control device, and a program.

Background Art

[0002] In an injection molding machine, when changing a molded product or a resin as a molding material, a process of purging the molding material remaining inside the injection molding machine used in the production of the previous molded product is carried out.

[0003] Patent Document 1 discloses an injection molding machine including a mold clamping device to which a mold device is attached and a control unit. During the replacement of the mold device attached to the mold clamping device, the control unit adjusts the mold clamping force by adjusting the mold thickness of the mold clamping device according to the mold device of the next mold, purges the molding material of the injection device during the replacement of the mold device, and starts the temperature control of the mold device of the next mold during the replacement of the mold device, and performs other setup operations.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Since the purged molding material is unnecessary for the production of the molded product, it is desirable to minimize the amount as much as possible. In order to reduce the amount of the purged molding material, it is necessary to stop the supply of the molding material at an appropriate timing in the production process of the molded product.

[0006] An object of the present invention is to control the supply of a molding material based on the amount of the molding material used in the production process of a molded product in an injection molding machine and suppress the supply of unnecessary molding material.

Means for Solving the Problems

[0007] One aspect of the present invention includes an injection device that injects a molding material into a mold for a molded product, and a control device that controls the supply of the molding material to the injection device. The control device sets a pre-stop operation amount representing the amount of the operation to be performed before stopping the operation of the injection device performed to manufacture the molded product, based on a parameter that specifies the number of molded products that can be manufactured using the molding material held by the injection device, and stops the supply of the molding material to the injection device at a time point that is retrogressed by the pre-stop operation amount from the time when the operation of the injection device stops. It is an injection molding machine characterized by this.

Advantages of the Invention

[0008] According to one aspect of the present invention, in the manufacturing process of a molded product in an injection molding machine, it is possible to control the supply of the molding material based on the amount of the molding material used and suppress the supply of wasteful molding material.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. <Device Configuration> FIG. 1 is a diagram showing the configuration of an injection molding machine to which the present embodiment is applied. The injection molding machine 10 includes an injection device 20, a mold clamping device 30, a control device 100, and a data processing device 200.

[0011] The injection device 20 includes a cylinder that heats a molding material, a screw that is rotatable within the cylinder and is provided so as to be able to advance and retreat in the axial direction, a rotary motor that drives the screw in the rotational direction, a motor that drives the screw in the axial direction, and the like. Details of the configuration of the injection device 20 will be described later. The molding material is, for example, a resin or the like. The injection device 20 injects the molding material that has been heated in the cylinder to become liquid by advancing in the direction (forward) from the injection device 20 toward the mold clamping device 30 while rotating the screw, and fills it into the mold of the mold clamping device 30 disposed in front of the injection device 20. The injection device 20 performs, for example, a metering process, a filling process, a holding pressure process, etc. in the manufacturing process of the molded product. The filling process and the holding pressure process are collectively referred to as an injection process.

[0012] The mold clamping device 30 includes a mold, a clamping mechanism that clamps the mold, a motor that drives the clamping mechanism, and the like. The mold clamping device 30 closes the mold and receives the molding material injected from the injection device 20 inside the mold. At this time, the mold clamping device 30 clamps the mold by the clamping mechanism so that the mold does not open when the molding material is filled (mold clamping). A molded product is generated when the molding material filled in the mold solidifies. After this, the mold clamping device 30 opens the mold so that the generated molded product can be taken out. The mold clamping device 30 performs, for example, a mold closing process, a pressure increasing process, a mold clamping process, a pressure releasing process, a mold opening process, etc. in the manufacturing process of the molded product.

[0013] The control device 100 is a device that controls the operations of the injection device 20 and the mold clamping device 30. The data processing device 200 is a device that processes data obtained as the injection device 20 and the mold clamping device 30 operate. Although not particularly shown, the control device 100 and the data processing device 200 are provided with an input device for a user to perform operations for inputting commands and data, a display device for displaying various screens such as an operation screen and an information presentation screen, and the like.

[0014] <Configuration of the control device 100> Figure 2 is a diagram showing the configuration of the control device 100. The control device 100 controls the operations of the injection device 20 and the mold clamping device 30. The control device 100 is realized by, for example, a computer. The control device 100 includes a control unit 110, a molding condition setting unit 120, and a storage unit 130. The control device 100 repeatedly manufactures molded products by controlling the injection device 20 and the mold clamping device 30 to repeatedly perform the processes related to the manufacture of molded products. The processes related to the manufacture of molded products include a metering process, a mold closing process, a pressure increasing process, a mold clamping process, a filling process, a pressure holding process, a cooling process, a pressure releasing process, a mold opening process, a pushing out process, and the like. Hereinafter, these processes related to the manufacture may be collectively referred to as the "manufacturing process". Also, a series of operations for obtaining a molded product, for example, the operations from the start of the metering process to the start of the next metering process in the above manufacturing process are called "shots", "molding cycles", and the like. Note that each of the above processes for manufacturing molded products is merely an example. For example, as a process executed in one shot, other processes not included above may be included.

[0015] The control unit 110 controls the injection device 20 and the mold clamping device 30 based on control information. The control information includes conditions set by the user and conditions fixedly determined. The conditions set by the user are generated based on information input by the user using, for example, an input device (not shown). The control information includes, for example, molding conditions such as cylinder temperature (resin temperature), mold temperature, injection holding pressure time, metering value, V-P switching position, holding pressure, injection speed (filling speed), screw rotation speed, screw back pressure, mold clamping force, etc. A plurality of combinations of these molding conditions are determined according to the molded product and the mold. The combined data of these molding conditions is hereinafter also referred to as molding condition dataset. The molding condition dataset is prepared according to the type of molded product, mold, etc., and stored in the storage unit 130.

[0016] The control unit 110 controls the injection device 20 and the mold clamping device 30 using the above molding condition dataset, and performs processes related to the manufacture (shot) of a molded product including the above respective processes. At the start of manufacturing a molded product or the like, the control unit 110 reads out from the storage unit 130 the molding condition dataset corresponding to the molded product to be manufactured. Then, the control unit 110 controls the operations of the injection device 20 and the mold clamping device 30 based on the control information including the read molding condition dataset. Specifically, the control unit 110 controls the injection device 20 and the mold clamping device 30 so that the data obtained from the injection device 20 and the mold clamping device 30 in the manufacturing process matches the set values of the molding condition dataset.

[0017] The molding condition setting unit 120 sets the molding conditions used in the control of the injection device 20 and the mold clamping device 30 by the control unit 110. The setting of the molding conditions is performed by the molding condition setting unit 120 writing a molding condition dataset into the control information held in the storage unit 130. Also, the setting of the molding conditions is performed based on information input by the user using an input screen described later. When the manufacturing process of the molded product is repeated, the states of the injection device 20 and the mold clamping device 30 change, and these state changes of the devices 20 and 30 affect the quality of the molded product (hereinafter referred to as "molding quality"). Therefore, in order to maintain the molding quality during the operation of mass-producing the molded product, the molding condition setting unit 120 may automatically adjust the molding conditions.

[0018] The storage unit 130 holds the control information used in the control of the injection device 20 and the mold clamping device 30 by the control unit 110. The control information includes the molding condition dataset set by the molding condition setting unit 120. The molding condition dataset is prepared in association with the molded product to be manufactured and the mold. The storage unit 130 holds the molding condition dataset for each molded product and mold to be manufactured. Also, the storage unit 130 holds the information on the molding conditions input by the user. The molding condition setting unit 120 writes the molding condition dataset into the control information based on the information held in the storage unit 130.

[0019] Also, although not shown, the storage unit 130 holds a program for the control unit 110 to control the injection device 20 and the mold clamping device 30, and a program for the molding condition setting unit 120 to set the molding conditions. As will be described in detail later, the functions of the control unit 110 and the molding condition setting unit 120 are realized by the processor in the control device 100 reading and executing the programs held in the storage unit 130.

[0020] <Configuration of the data processing device 200> FIG. 3 is a diagram showing the configuration of the data processing apparatus 200. The data processing apparatus 200 acquires and processes data obtained as the injection device 20 and the mold clamping device 30 execute operations in the process related to the production of the above-mentioned molded product. Further, the data processing apparatus 200 receives an input operation by the user, generates information used by the molding condition setting unit 120 of the control apparatus 100 to set molding conditions, and sends it to the control apparatus 100. The data processing apparatus 200 is realized by, for example, a computer. The data processing apparatus 200 includes a data acquisition unit 210, a processing unit 220, and a storage unit 230.

[0021] The data acquisition unit 210 acquires data to be processed from the injection device 20 and the mold clamping device 30. Various sensors, detectors, etc. are attached to the injection device 20 and the mold clamping device 30. Also, various measuring instruments may be connected to the injection device 20 or the mold clamping device 30. The data (hereinafter referred to as "acquired data") acquired using these sensors, detectors, measuring instruments, etc. is information representing the molding results by the injection device 20 and the mold clamping device 30, and is used for quality control of the molded product. Specifically, for example, it includes the weight of the molded product, the dimensions of the molded product, the in-mold pressure, the minimum cushion position, the characteristic values of the filling pressure waveform, etc. These acquired data are the actual values obtained in the production process of the molded product. The data acquisition unit 210 receives the acquired data transmitted from the sensors, detectors, or measuring instruments and stores it in the storage unit 230.

[0022] The processing unit 220 processes the acquired data stored in the storage unit 230. Specifically, the processing unit 220 performs processes such as extraction of representative values of the acquired data in each process and generation of time-series data obtained by time-seriesizing the acquired data in each process. In extracting the representative value, the processing unit 220 performs statistical processes on the acquired data, such as calculation of the average value, specification of the range of possible values, specification of the maximum value and the minimum value, etc.

[0023] The storage unit 230 holds the acquired data acquired by the data acquisition unit 210. As the data format of the acquired data held in the storage unit 230, for example, binary, text, CSV (Comma Separated Values), INI, YAML (YAML Ain't Markup Language), JSON (JavaScript Object Notation), etc. may be used. By using data files in these general-purpose data formats, it becomes possible to exchange the data files held in the storage unit 230 with other information processing devices or edit the data files acquired from external devices.

[0024] Also, although not shown, the storage unit 230 holds a program for the processing unit 220 to execute data processing. As will be described in detail later, when the processor in the data processing device 200 reads and executes the program held in the storage unit 230, the functions of the processing unit 220 are realized.

[0025] <Hardware Configuration of Control Device 100 and Data Processing Device 200> FIG. 4 is a diagram showing a hardware configuration example of a computer 400 that realizes the control device 100 and the data processing device 200. The computer 400 shown in FIG. 4 includes a processor 401 that is an arithmetic means, and a main storage device (main memory) 402 and an auxiliary storage device 403 that are storage means. As the processor 401, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or various other arithmetic circuits can be used. The processor 401 reads a program stored in the auxiliary storage device 403 into the main storage device 402 and executes it. As the main storage device 402, for example, a RAM (Random Access Memory) is used. As the auxiliary storage device 403, for example, a magnetic disk device, an SSD (Solid State Drive), or the like is used. Further, a display device 404 for displaying an image and an input device 405 as an input means for performing an input operation by a user of the computer are connected to the computer 400. As the input device 405, for example, a keyboard, a mouse, or the like is used. Note that the configuration of the computer 400 shown in FIG. 4 is merely an example, and the computer 400 used in the present embodiment is not limited to the configuration example of FIG. 4. For example, a configuration including a non-volatile memory such as a flash memory or a ROM (Read Only Memory) as a storage device may be used.

[0026] When the control device 100 is realized by the computer shown in FIG. 4, the functions of the control unit 110 and the molding condition setting unit 120 are realized, for example, by the processor 401 reading and executing a program. The storage unit 130 is realized, for example, by the auxiliary storage device 403.

[0027] When the data processing device 200 is realized by the computer shown in FIG. 4, the functions of the data acquisition unit 210 and the processing unit 220 are realized, for example, by the processor 401 reading and executing a program. The storage unit 230 is realized, for example, by the auxiliary storage device 403.

[0028] <Supply and Injection of Molding Material in Injection Process> Next, the supply and injection of the molding material in the injection process will be described. First, the configurations of the cylinder, screw, and hopper responsible for injecting the molding material in the injection device 20 will be described, and the operations of these configurations in the injection process will be described.

[0029] FIG. 5 is a diagram showing the configuration of the injection device 20. The injection device 20 includes a cylinder 21, a screw 22 provided in the cylinder 21, and a motor 23 that drives the screw 22. The injection device 20 also includes a hopper 24 for supplying the molding material into the cylinder 21, a heater 25 for heating and melting the molding material in the cylinder 21, and a backflow prevention valve 26 for preventing the liquid molding material from flowing back in the cylinder 21.

[0030] FIG. 6 is a diagram showing the state in which the injection device 20 holds the molding material. The hopper 24 stores the pellet-shaped molding material M. In the injection device 20, when the motor 23 rotationally drives the screw 22, the molding material M is sent from the hopper 24 to the front of the cylinder 21 along the grooves of the screw 22. The molding material M is heated by the heater 25 during the process of moving through the grooves of the screw 22 and melts into a liquid state. After that, when the motor 23 drives the screw 22 to advance forward in the cylinder 21, the liquid molding material M accumulated in the front of the cylinder 21 is injected and fills the mold 31 (see FIG. 5). The molding material M is supplied from the material supply device 500 to the hopper 24.

[0031] The backflow prevention valve 26 provided near the tip of the screw 22 is configured to open when the screw 22 rotates to send the molding material M forward in the cylinder 21, and to seal when the screw 22 advances forward in the cylinder 21. Thereby, when the injection device 20 injects the molding material M, the molding material M is prevented from flowing backward inside the cylinder 21.

[0032] After the production of the molded product by the injection molding machine 10 is completed, the injection device 20 purges (discharges) the surplus molding material M remaining inside the cylinder 21. Here, since the molding material M to be purged is a waste material not used for the production of the molded product, it is better to have a small amount. Therefore, the supply of the molding material M is stopped at a stage before the end of the manufacturing process, and the molded product for the remaining several shots is manufactured using the molding material M remaining inside the cylinder 21. On the other hand, if the timing of stopping the supply of the molding material M is too early, the molding material M inside the cylinder 21 may be used up before the end of the manufacturing process, and a situation may occur where the production target number of shots cannot be achieved. The number of shots is the number of times the molding cycle in the production of the molded product is carried out.

[0033] Therefore, in the present embodiment, the timing of stopping the supply of the molding material M is calculated based on the amount of the molding material M that can be accumulated in the cylinder 21 and the hopper 24 and the amount of the molding material M used in one shot, and the supply of the molding material M is controlled. The calculation of the timing of stopping the supply of the molding material M is performed, for example, by the data processing device 200. The supply control of the molding material M based on the calculated timing is performed, for example, by the control device 100 sending a control signal to the material supply device 500 to instruct the start and stop of the supply of the molding material M. Specifically, for example, the molding condition setting unit 120 of the control device 100 sets the supply control of the molding material M according to the calculation result of the timing of stopping the supply of the molding material M as one of the molding conditions, and the control unit 110 instructs the material supply device 500 to start and stop the supply of the molding material M according to the set content. In this case, the molding condition setting unit 120 is an example of the setting means, and the control unit 110 is an example of the stopping means.

[0034] <Determination of the Timing to Stop the Supply of the Molding Material M> The timing to stop the supply of the molding material M is determined as follows. First, based on the maximum amount (full amount) of the molding material M stored in the cylinder 21 and the hopper 24 of the injection device 20, the number of molded products that can be manufactured with this maximum amount of the molding material M, in other words, the number of shots that can be carried out (this number of shots is referred to as the "first number of shots") is specified. Next, the molding material M (so-called buffer) required to apply back pressure to the molding material M in the cylinder 21 is converted into the number of shots that can be carried out with that amount of the molding material M (this number of shots is referred to as the "second number of shots"), and the obtained value is subtracted from the first number of shots specified earlier. Then, the timing when the shot is before the number of shots before stopping (= the first number of shots - the second number of shots) by the number of shots before stopping compared to the time when the production target number of shots is carried out and the production of the molded product is completed is set as the timing to stop the supply of the molding material M. In other words, the number of shots before stopping is the number of shots carried out before the production of the molded product is completed and the execution of the shot (molding cycle) is stopped. That is, the number of shots before stopping is the number of times of execution before stopping.

[0035] The first number of shots in the number of shots before stopping is calculated, for example, by adding the volume of the cylinder 21 and the volume of the hopper 24 and dividing the obtained volume by the shot capacity. Here, the volume of the cylinder 21 corresponds to the volume of the screw 22 inserted into the cylinder 21 and is specified by the diameter (D) of the screw 22 and the length (L / D) of the screw 22. The volume of the hopper 24 is calculated based on the shape of the hopper 24 and the height of the molding material M stored in the hopper 24 at full capacity. The value obtained by adding the volume of the cylinder 21 and the volume of the hopper 24 generally corresponds to the maximum amount of the molding material M that the injection device 20 can hold.

[0036] The shot volume is the amount of the molding material M used in one shot. The shot volume corresponds to the volume of the molded product and is specified by the shape inside the mold 31. The shot volume is also called the molded product volume. Therefore, by dividing the value obtained by adding the volumes of the cylinder 21 and the hopper 24 by the shot volume, the first shot number, which is the number of shots that can be carried out with the molding material M stored to full capacity in the cylinder 21 and the hopper 24, can be obtained.

[0037] In the above description, the first shot number was obtained simply based on the volumes of the cylinder 21 and the hopper 24. On the other hand, other factors that affect the calculation of the first shot number may be considered to obtain a more accurate first shot number. Examples of the factors that affect the calculation of the first shot number include, for example, the metering completion position, the cushion position, the screw maximum retraction position, etc. The metering completion position is the position of the screw 22 when the metering process in the manufacturing process is completed. The metering process is a process of melting the molding material M, transporting it to the tip side of the screw 22, and accumulating it. In this metering process, the screw 22 retracts to a specified position within the cylinder 21. The position after this retraction is the metering completion position. The cushion position is the position when the screw 22 moves forward to the maximum within the cylinder 21. The screw maximum retraction position is the position when the screw 22 retracts to the maximum within the cylinder 21.

[0038] The second shot number is the amount corresponding to the molding material M required to apply back pressure to the molding material M within the cylinder 21, and for example, a fixed value determined based on the volume of the cylinder 21, etc. is set. Since the number of shots before stop = the first shot number - the second shot number, when the supply of the molding material M is stopped and the shots of the number of shots before stop are carried out and the manufacturing process of the molded product is completed, the molding material M corresponding to the second shot number remains in the cylinder 21. This remaining molding material M is the target of purging.

[0039] <Supply control of molding material M> FIG. 7 is a flowchart showing the control of the supply of the molding material M to the injection device 20. When manufacturing a molded product, first, the data processing device 200 of the injection molding machine 10 calculates the number of shots before stop (described as "the number of times N before stop" in the figure) by the above calculation described with reference to FIGS. 5 and 6 (S101). Then, under the control of the control device 100, the molding cycle of the molded product is started (S102).

[0040] Next, the control device 100 determines whether it is the timing to stop the supply of the molding material M. Specifically, taking the number of shots C implemented so far after the start of the molding cycle, the number of shots T of the production target, and the number of shots N to be implemented before the supply stop of the molding material M, it is determined whether C = T - N. If C ≠ T - N (NO in S103), it is determined whether C = T - N for each shot. On the other hand, if C = T - N (YES in S103), the control device 100 instructs the material supply device 500 to stop the supply of the molding material M (S104).

[0041] Next, the control device 100 determines whether C = T. If C ≠ T (NO in S105), it is determined whether C = T for each shot. On the other hand, if C = T (YES in S105), the control device 100 retracts the injection device 20 from the position during the injection process (S106), and purges the molding material M remaining in the cylinder 21 (S107).

[0042] The embodiments of the present invention have been described above, but the technical scope of the present invention is not limited to the above embodiments. For example, in the above embodiments, when manufacturing a molded product, the data processing device 200 calculates the number of shots before stop, which is the number of shots implemented before ending the production of the molded product and stopping the implementation of shots. In contrast, for the mold 31 that is frequently used, the number of shots before stop is calculated in advance based on the shot capacity of this mold 31 and held in the storage unit 230 etc. of the data processing device 200. When the mold 31 is used, the supply control of the molding material M may be performed using the held number of shots before stop.

[0043] Further, in the above-described embodiment, the timing for stopping the supply of the molding material M is specified based on the number of shots (first number of shots) that can be performed with the maximum amount (full amount) of the molding material M stored in the cylinder 21 and the hopper 24 of the injection device 20, and the number of shots (second number of shots) that can be performed with the amount of the molding material M necessary for applying back pressure in the cylinder 21. On the other hand, as information for specifying the timing for stopping the supply of the molding material M, information other than the number of shots (the number of times the molding cycle is performed) may be used as long as it is information related to the amount of the molding material M required to manufacture the molded product.

[0044] For example, the timing for stopping the supply of the molding material M may be specified based on the production quantity of the molded product itself. In this case, for example, the production quantity of the molded product that can be manufactured with the full amount of the molding material M is defined as the first production quantity, and the production quantity of the molded product that can be manufactured with the amount of the molding material M necessary for applying back pressure in the cylinder 21 is defined as the second production quantity. Then, it is conceivable that the timing for stopping the supply of the molding material M is when the production quantity of the molded product is the production quantity just before the stop production quantity (= first production quantity - second production quantity) before reaching the production target quantity.

[0045] Further, the timing for stopping the supply of the molding material M may be specified based on the number of rotations of the screw 22 in the injection device 20. In this case, for example, the number of rotations of the screw 22 when manufacturing the molded product with the full amount of the molding material M is defined as the first number of rotations, and the number of rotations of the screw 22 when manufacturing the molded product with the amount of the molding material M necessary for applying back pressure in the cylinder 21 is defined as the second number of rotations. Then, it is conceivable that the timing for stopping the supply of the molding material M is when the number of rotations of the screw 22 is the number of rotations just before the stop number of rotations (= first number of rotations - second number of rotations) before the number of rotations until the end of manufacturing the molded product. Here, the number of rotations of the screw 22 is used, but the rotation time of the screw 22 may be used instead of the number of rotations.

[0046] Further, the timing to stop the supply of the molding material M may be specified based on the driving time of the motor 23 in the injection device 20. In this case, for example, the driving time of the motor 23 when manufacturing a molded product with a full amount of the molding material M is defined as the first driving time, and the driving time of the motor 23 when manufacturing a molded product with an amount of the molding material M necessary to apply back pressure in the cylinder 21 is defined as the second driving time. Then, it is conceivable that the timing to stop the supply of the molding material M is when the driving time of the motor 23 is a driving time that is earlier than the driving time until the time when the manufacturing of the molded product ends by a pre-stop driving time (= the first driving time - the second driving time). In addition, based on various parameters such as the molding time and the metering time that can specify the number of molded products that can be manufactured using a full amount of the molding material M, and using the operation amount of the injection device 20 specified by such parameters, the timing to stop the supply of the molding material M may be specified. For example, using the operation amount of the injection device 20 when manufacturing a molded product with a full amount of the molding material M and the operation amount of the injection device 20 when manufacturing a molded product with an amount of the molding material M necessary to apply back pressure in the cylinder 21, the operation amount to stop the supply of the molding material M with respect to the operation amount of the injection device 20 until the time when the manufacturing of the molded product ends can be specified. In addition, various changes and configuration alternatives that do not depart from the scope of the technical idea of the present invention are included in the present invention.

Explanation of Reference Numerals

[0047] 10... injection molding machine, 20... injection device, 21... cylinder, 22... screw, 23... motor, 24... hopper, 25... heater, 26... backflow prevention valve, 30... mold clamping device, 31... mold, 100... control device, 110... control unit, 120... molding condition setting unit, 130...... storage unit, 200... data processing device, 210... data acquisition unit, 220... processing unit, 230... storage unit, 500... material supply device

Claims

1. An injection device for injecting a molding material into a mold of a molded product, A control device for controlling the supply of the molding material to the injection device, and comprising, The control device sets a pre-stop operation amount representing the amount of the operation to be performed before stopping the operation of the injection device performed to manufacture the molded product based on a parameter specifying the number of molded products that can be manufactured using the molding material held by the injection device, and stops the supply of the molding material to the injection device at a time point retrogressed by the pre-stop operation amount from the time of stopping the operation of the injection device. An injection molding machine characterized by that.

2. The pre-stop operation amount is an operation amount obtained by subtracting a predetermined operation amount of the injection device from an operation amount of the injection device for manufacturing a number of molded products that can be manufactured using the molding material held by the injection device. The injection molding machine according to claim 1, characterized by that.

3. The predetermined operation amount of the injection device is a value obtained by converting the amount of the molding material required to apply back pressure to the molding material in the injection device into the operation amount of the injection device. The injection molding machine according to claim 2, characterized by that.

4. The injection device, A cylinder filled with a molding material, A hopper used when supplying the molding material to the cylinder, and comprising, The control device calculates an operation amount of the injection device for manufacturing a number of molded products that can be manufactured using the molding material held by the injection device based on the volumes of the molding material in the cylinder and the hopper and the volume of the mold. The injection molding machine according to any one of claims 1 to 3, characterized by that.

5. An injection device for injecting a molding material into a mold of a molded product, A control device for controlling the supply of the molding material to the injection device, and comprising, The control device sets a pre-stop execution number which is the number of times of executing the molding cycle before stopping the execution of the molding cycle based on the number of times of executing the molding cycle of the molded product that can be executed using the molding material held by the injection device, and stops the supply of the molding material to the injection device at a time point retrogressed by the pre-stop execution number from the time of stopping the molding cycle. An injection molding machine characterized by that.

6. A control device for controlling the supply of a molding material to an injection device for injecting the molding material into a mold of a molded product, Setting means for setting a pre-stop operation amount representing the amount of the operation to be performed before stopping the operation of the injection device performed to manufacture the molded product based on a parameter for specifying the number of molded products that can be manufactured using the molding material held by the injection device; Stopping means for stopping the supply of the molding material to the injection device at a time point retrogressed by the pre-stop operation amount from the time of stopping the operation of the injection device; A control device, characterized by comprising the above.

7. A program executable by a computer for controlling the supply of a molding material to an injection device that injects the molding material into a mold for a molded product, Based on a parameter for specifying the number of molded products that can be manufactured using the molding material held by the injection device, a function of setting a pre-stop operation amount representing the amount of the operation to be performed before stopping the operation of the injection device performed to manufacture the molded product; A function of stopping the supply of the molding material to the injection device at a time point retrogressed by the pre-stop operation amount from the time of stopping the operation of the injection device; A program, characterized in that the above is realized in the computer.

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