Injection molding machine control device, injection molding machine, and injection molding machine control method

Abstract

To provide a control device with a high degree of freedom in a control method that can be set for a process of filling an injection material into a mold.SOLUTION: In a control device (4), an injection process and a pressure holding process are treated as indistinguishable with respect to a control of a molding cycle. Specifically, a process of filling molds (13, 14) with an injection material is divided into multiple control sections according to the number of sections specified. Then, for each control sections, one of several prepared control modes can be selected. The control modes include position control to control screw position, speed control to control screw speed, and pressure control to control screw axial force.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a control device for controlling an injection molding machine, an injection molding machine, and a control method for an injection molding machine. [Background technology]

[0002] An injection molding machine is equipped with a clamping device that clamps the mold and an injection device that injects injection material into the mold, all of which are controlled by a controller. The molding cycle for molding a molded product includes a metering process in which the injection device melts and measures the injection material, a clamping process that clamps the mold, an injection process that injects the injection material into the mold, a pressure-holding process that applies pressure to replenish the injection material, a mold-opening process, and an ejection process that ejects the molded product.

[0003] In a molding cycle, the process of filling a mold with injection material consists of an injection process and a pressure-holding process. These processes are controlled as described in Patent Document 1, for example. That is, in the injection process, the screw of the injection device is driven axially under speed control to inject the injection material and fill the mold. When the screw reaches a preset switching position, the injection process is completed and the process moves to the pressure-holding process, which involves controlling the axial force of the screw. In other words, the pressure of the injection material is controlled to replenish the injection material into the mold.

[0004] The injection process and the pressure holding process can also be divided into multiple stages for control. For example, the injection process can be divided into two stages, with the screw speed controlled at a relatively slow speed until the injected material reaches the gate, and then at a high speed once filling into the cavity begins. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-128812 Summary of the Invention [Problem to be solved by the invention]

[0006] By dividing the injection and packing processes into multiple stages and implementing complex control, it is possible to mold various molded products appropriately. However, the injection process is a process in which the screw is driven by speed control, and the packing process is a process in which it is driven by pressure control, and the control methods for each are fixed. In other words, the freedom to select control methods is limited. In recent years, the use of AI and other technologies in various technical fields has led to the discovery of control methods that are superior to those traditionally performed by skilled operators. The use of AI has also been proposed in the field of injection molding, and it is possible that control methods superior to conventional control methods will be discovered. However, as mentioned above, if the freedom to select control methods is limited, it will be difficult to respond.

[0007] In this disclosure, we propose a control device for an injection molding machine that allows you to freely set and select a control method for the process of filling a mold with injection material.

[0008] Other objects and novel features will become apparent from the description of this specification and the accompanying drawings. [Means for solving the problem]

[0009] The control device handles the molding cycle control without distinguishing between the injection process and the pressure holding process. Specifically, the process of filling the mold with injection material is divided into multiple control sections according to the specified number of sections. Then, for each control section, one of multiple control modes can be selected. The control modes include position control, which controls the screw position; speed control, which controls the screw speed; and pressure control, which controls the screw axial force. A stop control that maintains the screw position, and a zero speed control that maintains the screw speed at zero. Include. [Effects of the Invention]

[0010] According to the present disclosure, the degree of freedom in selecting a control method is increased, making it possible to accommodate the molding of various molded products. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a front view showing an injection molding machine according to a first embodiment of the present invention. [Figure 2] 3 is a front view of a setting screen displayed by the control device of the injection molding machine according to the first embodiment of the present invention. FIG. [Figure 3] 1 is a graph illustrating a control method that can be implemented in an injection molding machine according to the first embodiment of the present invention, showing changes in screw position, screw speed, and pressure during the process of filling a mold with injection material. [Figure 4] 4 is a flowchart illustrating a process of filling a mold with an injection material, which is performed by the control device of the injection molding machine according to the present embodiment. [Figure 5] FIG. 10 is a front view of a setting screen displayed by a control device of a conventional injection molding machine. [Figure 6] 1 is a graph illustrating a control method implemented in a conventional injection molding machine, showing changes in screw position, screw speed, and pressure during the injection process and the pressure holding process. [Figure 7] FIG. 4 is a block diagram showing a control device for an injection molding machine according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a block diagram showing a control device for an injection molding machine according to a third embodiment of the present invention. [Figure 9] FIG. 10 is a block diagram showing a control device for an injection molding machine according to a fourth embodiment of the present invention. [Figure 10] 1 is a network diagram showing an injection molding machine system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Specific embodiments will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments. For clarity of explanation, the following description and drawings have been simplified as appropriate. In each drawing, the same elements are given the same reference numerals, and duplicate explanations are omitted as necessary. Furthermore, hatching has been omitted in some areas to avoid cluttering the drawings.

[0013] The present embodiment will be described. <Injection molding machine> As shown in FIG. 1, the injection molding machine 1 according to this embodiment is generally composed of a mold clamping device 2 that clamps a mold, an injection device 3 that melts and injects an injection material, and a first control device 4A according to this embodiment that controls these devices.

[0014] <Mold clamping device> The mold clamping unit 2 comprises a fixed platen 5 fixed on bed B, a mold clamping housing 6 that slides on bed B, and a movable platen 7 that similarly slides on bed B. The fixed platen 5 and the mold clamping housing 6 are connected by a plurality of tie bars 9, for example, four tie bars 9. The movable platen 7 is slidable between the fixed platen 5 and the mold clamping housing 6. A mold clamping mechanism 11 is provided between the mold clamping housing 6 and the movable platen 7. The mold clamping mechanism 11 may be a direct pressure type mold clamping mechanism, i.e., a mold clamping cylinder, but in this embodiment it is configured as a toggle mechanism. Molds 13 and 14 are provided on the fixed platen 5 and the movable platen 7, respectively, and when the mold clamping mechanism 11 is driven, the molds 13 and 14 are opened and closed.

[0015] <Injection device> The injection device 3 is composed of a heating cylinder 16, a screw 17 placed in the heating cylinder 16, and a screw drive device 18 that drives the screw 17. The heating cylinder 16 has a hopper 20 near its rear end and an injection nozzle 22 at its tip.

[0016] <Control Device According to the First Embodiment> The control device 4A, i.e., the controller, according to the first embodiment controls the mold clamping unit 2 and the injection unit 3 to carry out a molding cycle. The control device 4A according to this embodiment is characterized in that it offers a high degree of freedom in selecting a control method for the process of filling the molds 13, 14 with injection material, which is part of the molding cycle. The control device 4A is provided with a monitor 23 equipped with an input device for displaying a screen. The monitor 23 displays a filling process setting screen, which will be described next.

[0017] <Filling process setting screen> In this embodiment, the process of filling the molds 13, 14 with injection material is called the filling process. Conventionally, the filling process has been divided into two processes, the injection process and the pressure holding process. A screen for setting the control method for the filling process, i.e., a part of the filling process setting screen 25, is shown in Figure 2.

[0018] <Number of sections in the control section> In this embodiment, the filling process can be divided into a plurality of control sections. The number of sections can be specified by the operator. The desired number of sections is input in the section number input field 26 on the filling process setting screen 25. In the example of FIG. 2, 5 is specified as the number of sections. Next, the execute button 28 is selected. This causes the specified number of control sections to be displayed in the lower section of the filling process setting screen 25. In other words, five control sections, "1st" to "5th", are displayed.

[0019] <Control mode> For each of the multiple control sections, a desired control mode can be selected from a control mode selection field. That is, the filling process setting screen 25 is provided with control mode selection pull-down lists 31, 31, ..., allowing one control mode to be selected from multiple control modes. In this embodiment, five selectable control modes are provided: speed control, position control, pressure control, stop control, and zero speed control. Each of these will be explained below.

[0020] <Speed ​​control> Speed ​​control is a control mode in which the speed of the screw 17 (see FIG. 1), i.e., the screw speed, is controlled to a target speed. When speed control is performed, the condition for determining the completion of a control section, i.e., the completion condition, is the screw position. In other words, the control section is completed when the screw 17 reaches a preset screw position. In the example shown in FIG. 2, speed control is selected for the "1st" control section and the "3rd" control section, and the target speeds are set to 75.0 mm / s and 70.0 mm / s, respectively, as indicated by reference numerals 33 and 34. In addition, the screw position, which is the completion condition, is set to 83.00 mm and 45.00 mm, respectively, as indicated by reference numerals 35 and 36. The input fields indicated by reference numerals 35 and 36 can be called completion condition input fields.

[0021] Each control mode also defines a set value for determining whether to interrupt a control interval, i.e., an interruption condition. An interruption means ending a control interval midway without waiting for its completion, and moving on to the next control interval. In speed control, an interruption is determined by the time elapsed since the start of control. Therefore, an elapsed time is set. In the example of Figure 2, for the "1st" and "3rd" control intervals, the elapsed times that are the interruption conditions are set to 2.50 s and 2.50 s, respectively, as indicated by reference numerals 38 and 39. When these elapsed times have elapsed, speed control will be interrupted and the system will move on to the next control interval. The fields indicated by reference numerals 38 and 39 can be called the interruption condition input fields.

[0022] In each control mode, control is stopped if an abnormality is detected. In the control section, the pressure value of the injection material is set as the condition for determining an abnormality. In the example in Figure 2, 170.0 MPa and 177.0 MPa are set for the "1st" and "3rd" control sections, as shown by reference numbers 41 and 42, respectively.

[0023] <Position control> Position control is a control mode that controls the position of the screw 17 (see Figure 1), i.e., the screw position, so that it reaches a target position. When position control is performed, the completion condition for the control section is set by the screw position. The interruption condition is determined by the elapsed time, and when the set elapsed time is reached, the position control is interrupted and the process moves to the next control section. In the example of Figure 2, the "2nd" control section is selected for position control. The screw position, which is the target position, is set to 81.00 mm in column 44, the screw position, which is the completion condition, is set to 75.00 mm in column 46, and the interruption condition is set to 0.20 s in column 45. Columns 46 and 45 can be called the completion condition input column and the interruption condition input column, respectively.

[0024] <Pressure control> Pressure control is a control mode that controls the axial force of the screw 17 (see Figure 1). In other words, it controls the pressure of the injection material applied by the screw 17 so that it reaches the target pressure. When pressure control is implemented, the completion condition for the control section is set by the elapsed time. The interruption condition is determined by the screw position, and when the set screw position is reached, pressure control is interrupted and the process moves to the next control section. In the example of Figure 2, the "5th" control section is selected for pressure control. The target pressure is set to 50.0 MPa in column 51, the completion condition is set to 2.50 s in column 52, and the screw position, which is the interruption condition, is set to 32.00 mm in column 53. Columns 52 and 53 can be called the completion condition input column and the interruption condition input column, respectively.

[0025] <Stop control> Stop control is a control that maintains the screw position at its current position. In other words, position control is performed with the current screw position as the target position. Even if the screw position temporarily changes due to the pressure of the injection material, position control will be performed with the changed position as the new target position. Figure 2 does not show an example in which stop control is selected. When stop control is performed, the completion condition for the control section is set by the elapsed time. In addition, the interruption condition is determined by the screw position, and when the set screw position is reached, stop control will be interrupted and the process will move on to the next control section.

[0026] <Zero speed control> Zero speed control is a control mode that controls the screw speed to zero. When zero speed control is implemented, the completion condition for the control section is set by the elapsed time. The interruption condition is determined by the screw position, and when the set screw position is reached, zero speed control is interrupted and the process moves to the next control section. In the example of Figure 2, the "4th" control section is selected as "0 speed," or zero speed control. The completion condition is set to 0.10 s in column 55, and the screw position, which is the condition for determining whether to interrupt, is set to 41.00 mm in column 56. Columns 55 and 56 can be called the completion condition input column and the interruption condition input column, respectively.

[0027] <Control mode variation> In this embodiment, five control modes are provided, namely, speed control, position control, pressure control, stop control, and zero speed control, from which a selection can be made. However, control modes using other control methods may be added. In other words, six or more modes may be provided. Alternatively, only three control modes, speed control, position control, and pressure control, may be provided from which a selection can be made. In any case, a feature of the control device 4A (see FIG. 1) according to this embodiment is that a control mode can be freely selected in multiple control sections.

[0028] <Filling process control by control device> The control of the filling process performed by the control device 4A shown in Fig. 1 will be described with reference to Fig. 4. In the filling process, the control device 4A moves to the first control section, i.e., the "1st" control section (step S1). The control device 4A acquires the selected control mode (step S2). Depending on the control mode, the process branches to different processes.

[0029] If speed control is selected, the process proceeds to step S11, where speed control is performed. As already explained, the screw 17 (see FIG. 1) is driven with the set screw speed as the target speed. In step S12, it is determined whether the completion condition has been met. That is, it is determined whether the set screw position has been reached. If not, the process proceeds to step S13. On the other hand, if the completion condition has been met, the control section is completed and the process proceeds to step S4. In step S13, it is determined whether the interruption condition has been met. If the elapsed time, which is the interruption condition, has been reached, the control is interrupted and the process proceeds to step S4. If the interruption condition has not been met, the process returns to step S11, where speed control continues.

[0030] If position control is selected, the process proceeds to step S21, where position control is performed. In other words, the screw 17 (see FIG. 1) is driven with the set screw position as the target position. It is determined whether or not the completion condition is met (step S22). As already explained, the completion condition is the screw position. When the screw 17 reaches the screw position, the control section is completed and the process proceeds to step S4. On the other hand, if the completion condition is not met, the process proceeds to step S23, where it is determined whether or not the interruption condition is met. The interruption condition is the elapsed time, and when the elapsed time is reached, the control section is interrupted and the process proceeds to step S4. If the interruption condition is not met, the process returns to step S21.

[0031] If pressure control is selected, the process proceeds to step S31, where pressure control is carried out. In other words, the set pressure is used as the target pressure and the screw 17 (see FIG. 1) is driven. It is determined whether or not the completion condition is met (step S32). As already explained, the completion condition is the elapsed time. If the elapsed time is met, the control section is completed and the process proceeds to step S4. On the other hand, if the completion condition is not met, the process proceeds to step S33, where it is determined whether or not the interruption condition is met. The interruption condition is the screw position, and if the screw 17 reaches that screw position, the control section is interrupted and the process proceeds to step S4. If the interruption condition is not met, the process returns to step S31.

[0032] If stop control is selected, the process proceeds to step S41 and stop control is performed. In other words, the screw 17 (see FIG. 1) is driven so as to maintain the current screw position. It is determined whether or not the completion condition has been met (step S42). As already explained, the completion condition is the elapsed time. If the elapsed time has been met, the control section is completed and the process proceeds to step S4. On the other hand, if the completion condition has not been met, the process proceeds to step S43 and it is determined whether or not the interruption condition has been met. The interruption condition is the screw position. If the screw 17 has reached the screw position, the control section is interrupted and the process proceeds to step S4. If the interruption condition has not been met, the process returns to step S41.

[0033] If zero speed control is selected, the process proceeds to step S51, where stop control is performed. In other words, speed control is performed so that the screw speed becomes zero. It is determined whether or not the completion condition is reached (step S52). As already explained, the completion condition is the elapsed time. If the elapsed time is reached, the control section is completed and the process proceeds to step S4. On the other hand, if the completion condition is not reached, the process proceeds to step S53, where it is determined whether or not the interruption condition is met. The interruption condition is the screw position. If the screw 17 reaches the screw position, the control section is interrupted and the process proceeds to step S4. If the interruption condition is not met, the process returns to step S51.

[0034] In step S4, it is checked whether the next control section exists. If the next control section does not exist, the control is completed. If the next control section exists, the process returns to step S2. Then, the control mode selected for the next control section is obtained, and the same process is repeated.

[0035] <Example of filling process> Figure 3 shows graphs of the filling process controlled by the control device 4A (see Figure 1) according to this embodiment in accordance with the conditions shown in Figure 2. That is, the graphs show the changes in screw speed 61, screw position 62, and injection material pressure 63 when speed control, position control, speed control, zero speed control, and pressure control are performed in sequence. From these graphs, it can be seen that a high degree of freedom in control can be achieved in the filling process.

[0036] <Previous injection and packing pressure setting screen> FIG. 5 shows a conventional injection / hold pressure setting screen 101. The upper section of the injection / hold pressure setting screen 101 allows settings for the injection process, as indicated by reference numeral 102, and the lower section allows settings for the hold pressure process, as indicated by reference numeral 103. First, in the injection process, only speed control, which controls the screw speed, is set. In this example, the injection process is divided into two stages. The first stage is speed-controlled at 70.0 mm / s, as indicated by reference numeral 105, and is set to end when the screw position reaches 83.00 mm, as indicated by reference numeral 106. The second stage is speed-controlled at 75.0 mm / s, as indicated by reference numeral 107, and is set to transition to the hold pressure process when the screw position reaches 45.00 mm, as indicated by reference numeral 108.

[0037] The pressure holding process is set to only pressure control, and in this example, it is divided into two stages. That is, in the first stage, as shown by reference numerals 110 and 111, pressure is controlled at 50.0 MPa for 0.50 s, and then in the second stage, as shown by reference numerals 112 and 113, pressure is controlled at 40.0 MPa for 0.50 s.

[0038] The graph in Figure 6 shows how the injection process and the pressure holding process are controlled by a conventional control device under the conditions shown in Figure 5. That is, the graph shows the screw speed 115, screw position 116, and injection material pressure 117, which change when speed control is performed in the injection process and pressure control is performed in the pressure holding process. The control methods that can be selected using conventional control devices are limited.

[0039] <Control device according to second embodiment> A control device 4B according to a second embodiment of the present invention is shown in FIG. 7. The control device 4B according to this embodiment includes a recommendation calculation unit 70B. The recommendation calculation unit 70B is configured to output a recommended number of sections for the filling process, i.e., a recommended number of sections 77, and a recommended control mode for each of the multiple control sections, i.e., a recommended control mode 78. When setting up a filling process for a new mold, an operator can refer to the recommended number of sections 77 and the recommended control mode 78. Note that the control device 4B may also be configured to automatically set up the filling process. In this embodiment, the recommendation calculation unit 70B includes a machine learning device 71 that performs machine learning using supervised learning. In other words, the trained machine learning device 71 is configured to output the recommended number of sections 77 and the recommended control mode 78.

[0040] The machine learning device 71 can use various algorithms, such as SVM (Support Vector Machine) or a stepwise method, but in this embodiment, a multi-layered neural network is used. The machine learning device 71 must be trained in advance. First, multiple training data 73 are prepared. The training data 73 consists of a large amount of data related to various molds and injection materials. Specifically, the data consists of mold shape information, injection material information, the number of sections, and the control mode for each control section.

[0041] The mold shape information is information about the shape of the mold, including, for example, runner volume and molded product volume. Furthermore, flow analysis information may be obtained by analyzing the behavior of the injection material, such as the speed and pressure, within the mold when the injection material is filled into the mold, and this information may be included in the mold shape information. The injection material information is information about the injection material, such as the type of resin and temperature. The number of sections and control modes included in the training data 73 consist of the number of sections actually set by a skilled operator and the control mode selected for each control section. These number of sections and control modes serve as training data for machine learning. The machine learning device 71 is trained using a large amount of training data 73.

[0042] In the injection molding machine 1 equipped with the control device 4B according to this embodiment, the filling process for a new mold is set as follows. Mold shape information 75 is obtained for the new mold, and injection material information 76 is obtained for the injection material to be injected. As described above, the mold shape information 75 may include flow analysis information. Such mold shape information 75 and injection material information 76 are input to the recommendation calculation unit 70B, i.e., the machine learning machine 71. The trained machine learning machine 71 outputs an appropriate recommended number of sections 77 and an appropriate recommended control mode 78 for each control section.

[0043] <Control device according to the third embodiment> 8 shows a control device 4C according to a third embodiment. In this embodiment, the control device 4C also includes a recommendation calculation unit 70C. However, in this embodiment, the recommendation calculation unit 70C also includes a machine learning device 80 that performs machine learning using reinforcement learning. When mold shape information 75 and injection material information 76 about a new mold are input, this machine learning device 80 outputs a recommended number of sections 77 and a recommended control mode 78.

[0044] More specifically, the machine learning machine 80 is provided with a behavioral module 81, which treats input mold shape information 75 and injection material information 76 as a state, and determines and outputs appropriate actions for this state, that is, a recommended number of sections 77 and a recommended control mode 78. In other words, the behavioral module 81 is provided with a policy expressed as a probability for determining what action to take when a state is given, and determines an action based on the policy.

[0045] The operator adopts the output recommended section 77 and recommended control mode 78 and sets the filling process based on these. Next, a molding cycle is performed in the injection molding machine 1 based on the set filling process, and a molded product is actually molded. The obtained molded product is then judged as to whether it is good or bad, that is, a molded product quality judgment 84 is performed. The molded product quality judgment 84 may be performed by obtaining an image of the molded product with a camera and judging the type and degree of the molding defect using an image processing device, or by other means or based on the operator's subjective judgment. In either case, the quality of the molded product is quantified based on the obtained type and degree of the molding defect, and this is given to the machine learning device 80 as a reward.

[0046] The machine learning device 80 is equipped with an evaluator 82, which has a state value function that expresses the value of each state. The state value function is updated according to the given reward. The probability of the policy of the behavior device 81 is updated using this state value function and reward. In other words, reinforcement learning is performed. Next, the behavior device 81 outputs appropriate actions for the given state based on the updated policy, i.e., a recommended number of sections 77 and a recommended control mode 78. The operator sets the filling process and molds a molded product using the injection molding machine 1. A molded product pass / fail judgment 84 is performed and the result is given as a reward to the machine learning device 80, thereby performing reinforcement learning. This cycle is repeated. As reinforcement learning progresses, the output recommended number of sections 77 and recommended control mode 78 become more appropriate.

[0047] <Control device according to the fourth embodiment> FIG. 9 shows a control device 4D according to a fourth embodiment. In this embodiment, the control device 4D also includes a recommendation calculation unit 70D. However, in this embodiment, the recommendation calculation unit 70D receives mold shape information 75 and injection material information 76 as input data, and outputs a recommended number of sections 77 and a recommended control mode 78 based on a rule base 88. The rule base 88 is a database in which a plurality of predefined rules are stored. Here, the plurality of rules may be, for example, a rule that the cavity thickness is 30 mm or less and the volume is 100 cm 3 In the above cases, the number of sections should be 4 or more, the speed should be set in proportion to the cross-sectional area of ​​the resin flow path, etc. These are agreements between the mold shape information 75 and injection material information 76 and the recommended number of sections 77 and recommended control mode 78.

[0048] <Injection molding machine system> FIG. 10 shows an injection molding machine system 90 according to this embodiment. The injection molding machine system 90 comprises an injection molding machine 1, an accessory control device 91 attached to the injection molding machine 1, and an external control device 92 connected to the accessory control device 91 via a network 95. In this injection molding machine system 90, a recommendation calculation unit 70E is provided in the external control device 92. The recommendation calculation unit 70E may include a machine learning device or may refer to a rule base. When mold shape information 75 and injection material information 76 are input, the recommendation calculation unit 70E outputs a recommended section number 77 and a recommended control mode 78. The recommended section number 77 and the recommended control mode 78 are then transmitted to the accessory control device 91 via communication.

[0049] The invention made by the inventor has been specifically described above based on the embodiments, but it goes without saying that the present invention is not limited to the above-described embodiments and various modifications are possible without departing from the spirit of the invention. The multiple examples described above can also be implemented in appropriate combinations. [Explanation of symbols]

[0050] 1 Injection molding machine 2 Mold clamping device 3 Injection unit 4 Control unit 5 Stationary platen 6 Clamping housing 7 Movable platen 9 Tie bar 11 Mold clamping mechanism 13 Mold 14 mold 16 heating cylinder 17 Screw 18 Screw drive device 20 Hopper 22 Injection nozzle 23 Monitor 25 Filling process setting screen 26. Number of sections input field 28. Execute button 31 Control mode selection pull-down list 70 Recommended calculation unit 71 Machine learning machine 73 Training data 75 Mold shape information 76 Injection Material Information 77 Recommended Number of Sections 78 Recommended Control Mode 80 Machine Learning 81 Behavior 82 Evaluation 84 Molded product quality judgment 88 Rule-based 90 Injection molding machine system 91 Accessory control device 92 External control device

Claims

1. A control device for controlling an injection molding machine, the control device divides a process of filling a mold with injection material in a molding cycle into a plurality of control sections, and controls the injection molding machine by sequentially executing the plurality of control sections until a completion condition is reached; The number of the plurality of control sections can be specified, and one of a plurality of control modes can be selected for each of the plurality of control sections, The plurality of control modes include a position control for controlling a screw position; a speed control for controlling the screw speed; Pressure control to control the screw axial force; a stop control to maintain the screw position; a zero speed control for maintaining the screw speed at zero; The control device, wherein the completion condition is the passage of a specified time when the pressure control, the stop control, or the zero speed control is selected as the control mode, or when a specified screw position is reached when the position control or the speed control is selected.

2. 2. The control device according to claim 1, wherein the control of the plurality of control sections is interrupted and transitioned to the next control section when a specified screw position is reached if the pressure control, the stop control, or the zero speed control is selected as the control mode, or when a specified time has elapsed if the position control or the speed control is selected.

3. 3. The control device according to claim 1, further comprising a recommendation calculation unit, which, when mold shape information relating to the shape of the mold and injection material information relating to the injection material are input, outputs the recommended number of sections and the recommended control mode for each of the plurality of control sections.

4. The control device according to claim 3 , wherein the mold shape information includes flow analysis information obtained by flow analysis of the injection material in the mold.

5. The control device according to claim 3 or 4, wherein the recommendation calculation unit includes a machine learning device that has undergone machine learning, and the machine learning device outputs the recommended number of sections and the recommended control mode for each of the plurality of control sections.

6. 6. The control device according to claim 5, wherein the machine learning machine learns the mold shape information, the injection material information, the number of sections actually specified by an operator, and the control mode specified for each of the plurality of control sections actually specified by the operator as training data.

7. 6. The control device according to claim 5, wherein the machine learning device is subjected to reinforcement learning based on the mold shape information and the injection material information, the number of sections actually specified by an operator, the control mode specified for each of the plurality of control sections actually specified by the operator, and a reward according to a degree of defect obtained by actual molding.

8. a mold clamping device that clamps the mold; an injection device that includes a heating cylinder and a screw and injects an injection material into the mold; a control device that controls the mold clamping device and the injection device, the control device divides a process of filling the mold with injection material in a molding cycle into a plurality of control sections, and controls the injection molding machine by sequentially executing the plurality of control sections until a completion condition is reached; The number of the plurality of control sections can be specified, and one of a plurality of control modes can be selected for each of the plurality of control sections, The plurality of control modes include a position control for controlling a screw position; a speed control for controlling the screw speed; Pressure control to control the screw axial force; a stop control to maintain the screw position; a zero speed control for maintaining the screw speed at zero; The completion condition is the passage of a specified time when the pressure control, the stop control, or the zero speed control is selected as the control mode, or the arrival of a specified screw position when the position control or the speed control is selected.

9. 9. The injection molding machine according to claim 8, wherein the control of the plurality of control sections is interrupted and transitioned to the next control section when a designated screw position is reached if the pressure control, the stop control, or the zero speed control is selected as the control mode, or when a designated time has elapsed if the position control or the speed control is selected.

10. an injection molding machine having a mold clamping device that clamps a mold, and an injection device that includes a heating cylinder and a screw and injects an injection material into the mold; and the control device according to claim 3; the control device comprises an accessory control device that is attached to the injection molding machine and controls the injection molding machine, and an external control device that is connected to the accessory control device through a network; The recommendation calculation unit is provided in the external control device and transmits the recommended number of sections and the recommended control mode for each of the plurality of control sections to the attached control device.

11. A control method for controlling an injection molding machine, comprising: Dividing a process of filling a mold with injection material in a molding cycle into a plurality of control sections, and controlling the injection molding machine by sequentially executing the plurality of control sections until a completion condition is reached; The number of the plurality of control sections can be specified, and one of a plurality of control modes can be selected for each of the plurality of control sections, The plurality of control modes include a position control for controlling a screw position; a speed control for controlling the screw speed; Pressure control to control the screw axial force; a stop control to maintain the screw position; a zero speed control for maintaining the screw speed at zero; The completion condition is the passage of a specified time when the pressure control, the stop control, or the zero speed control is selected as the control mode, or when a specified screw position is reached when the position control or the speed control is selected.

12. The control method according to claim 11, further comprising the steps of: outputting the recommended number of sections and outputting the recommended control mode for each of the plurality of control sections based on shape information relating to the shape of the mold and injection material information relating to the injection material.

13. A display device of a control device that controls an injection molding machine, the control device divides a process of filling a mold with injection material in a molding cycle into a plurality of control sections, and controls the injection molding machine by sequentially executing the plurality of control sections until a completion condition is reached; a setting screen displayed on the display device displays a section number input field for specifying the number of sections of the plurality of control sections, and when the number of sections is specified in the section number input field, a control mode selection field of the same number as the number of sections and a completion condition input field for setting the completion condition are displayed; The control mode selection fields correspond to the plurality of control sections, respectively, and one of a plurality of control modes can be selected, The plurality of control modes include position control for controlling a screw position, speed control for controlling a screw speed, pressure control for controlling a screw axial force, stop control for maintaining a screw position, and zero speed control for maintaining a screw speed at zero, A display device in which the completion condition input field is configured to input the time when a specified time has elapsed when the pressure control, the stop control, or the zero speed control is selected as the control mode, and the time when a specified screw position is reached when the position control or the speed control is selected.

14. The display device according to claim 13 , wherein the setting screen displays an interruption condition input field for setting an interruption condition for determining whether to interrupt control for each of the plurality of control sections.

Images