Injection machine and abnormality detection method of injection machine

Abstract

To detect abnormality of a drive unit while suppressing productivity loss of molded products.SOLUTION: An injection machine 100 performs a first acquisition process for acquiring physical quantities for detecting an abnormality in a first drive unit during a flushing process.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an injection molding machine and an abnormality detection method for an injection molding machine. [Background technology]

[0002] For example, JP 2021-74917 A (Patent Document 1) discloses an injection molding machine equipped with a ball screw. This injection molding machine detects an abnormality in the ball screw by performing frequency analysis on the vibration intensity of the ball screw. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-74917 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned injection molding machine, a drive device (for example, the above-mentioned ball screw) is controlled to obtain a physical quantity (for example, the above-mentioned vibration intensity) of the drive device. However, in the above-mentioned injection molding machine, the timing of controlling the drive device is not taken into consideration. Therefore, in the above-mentioned injection molding machine, the production of molded products is temporarily stopped to control the drive device, which may cause a problem of reduced productivity of molded products. In addition, the injection molding machine may also cause a problem of neglecting the abnormality detection process for the drive device itself.

[0005] The present invention has been made to solve such problems, and its object is to perform abnormality detection processing of the drive device without neglecting, while suppressing a decrease in productivity of molded products. [Means for solving the problem]

[0006] The injection molding machine and the abnormality detection method for the injection molding machine according to the present disclosure execute a first acquisition process to acquire a first physical quantity detected by a first sensor during a period in which the first drive device is controlled to drive the screw. Also, the injection molding machine and the abnormality detection method for the injection molding machine according to the present disclosure detects an abnormality in the first drive device based on the first physical quantity acquired by the first acquisition process. Then, the injection molding machine and the abnormality detection method for the injection molding machine according to the present disclosure executes the first acquisition process during a flushing process. Effect of the Invention

[0007] According to the present disclosure, it is possible to perform abnormality detection processing for a drive device without neglecting, while suppressing a decrease in productivity of molded products. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram for explaining a configuration of an injection molding machine. [Diagram 2] FIG. 2 is a diagram showing a detailed configuration of an actuator. [Diagram 3] FIG. 2 is a functional block diagram of a control device. [Figure 4] 4 is a flowchart showing a control flow of the control device. [Diagram 5] 13 is a flowchart showing a flow of a first flushing process. [Figure 6] 13 is a flowchart showing the flow of an acquisition process. [Figure 7] 13 is a flowchart showing a flow of a second flushing process. [Figure 8] 13 is a flowchart showing the flow of an acquisition process according to another embodiment. [Figure 9] 13 is a flowchart showing the flow of an acquisition process according to another embodiment. [Figure 10] FIG. 2 is a diagram showing a display example of a display 132. [Figure 11] FIG. 11 is a diagram showing an example of a time sequence of processes of an injection molding machine 100 according to another embodiment. [Figure 12]FIG. 11 is a diagram showing an example of a time sequence of processes of an injection molding machine 100 according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and the description thereof will not be repeated.

[0010] First Embodiment [Injection molding machine configuration] FIG. 1 is a diagram for explaining the configuration of an injection molding machine 100. For convenience of explanation, the floor surface on which the injection molding machine 100 is placed in FIG. 1 is taken as an XY plane, and the direction perpendicular to the floor surface is taken as a Z-axis direction. The positive direction of the Z-axis may be referred to as the upper side or upward, and the negative direction as the lower side or downward. Although the injection molding machine 100 is shown as a horizontal injection molding machine, it is not limited to the horizontal type and may be a vertical injection molding machine. The X-axis direction is taken as the extension direction of a cylinder 122 described later.

[0011] The injection molding machine 100 includes a clamping unit 110 for clamping a mold, an injection unit 120 for melting and injecting an injection material, an operation panel 130, and a control unit 140. In Fig. 1, the clamping unit 110 is disposed on the negative side of the X-axis with respect to the injection unit 120.

[0012] The mold clamping device 110 includes a bed 111, a fixed platen 112, a mold clamping housing 113, a movable platen 114, tie bars 115, a mold clamping mechanism 116, molds 117 and 118, a ball screw 119, a ball screw nut 137, and a second vibration sensor 82. The bed 111 is placed on the floor surface, and devices such as the fixed platen 112, the mold clamping housing 113, and the movable platen 114 are mounted on the upper surface of the bed 111.

[0013] The fixed platen 112 is fixed to the end of the bed 111 closer to the injection unit 120 (i.e., in the positive direction of the X-axis). The mold clamping housing 113 is disposed at the end of the bed 111 in the negative direction of the X-axis. The fixed platen 112 and the mold clamping housing 113 are connected by a tie bar 115 including a plurality of bars. The mold clamping housing 113 is movable on the bed 111 in the X-axis direction.

[0014] The movable platen 114 is disposed on the bed 111 between the fixed platen 112 and the clamping housing 113. The movable platen 114 is configured to be movable in the X-axis direction. The clamping housing 113 and the movable platen 114 are connected by a clamping mechanism 116. The clamping mechanism 116 has a toggle mechanism. A ball screw 119 is connected to the toggle mechanism via a ball screw nut 137. Then, by driving a servo motor 151 disposed in the clamping housing 113 to rotate the ball screw 119, the movable platen 114 can be moved in the X-axis direction relative to the clamping housing 113. Note that a direct acting cylinder driven by hydraulic pressure may be used as the clamping mechanism 116.

[0015] In this manner, the control device 140 drives the servo motor 151 to rotate the ball screw 119, thereby controlling the movable platen 114. The servo motor 151 and the ball screw 119 correspond to the "second driving device 162" in this disclosure. The movable platen 114 corresponds to the "predetermined member" in this disclosure.

[0016] The second vibration sensor 82 is installed on the ball screw nut 137. For example, an acceleration sensor is used as the second vibration sensor 82. The second vibration sensor 82 detects a vibration value of the ball screw 119 (second driving device 162) while the ball screw 119 is being driven. The vibration value is used for abnormality detection processing of the ball screw 119 (second driving device 162). The second vibration sensor 82 corresponds to a "second sensor" in this disclosure. In addition, the vibration value of the ball screw 119 while being driven corresponds to a "second physical quantity" in this disclosure.

[0017] Molds 117 and 118 are disposed on the movable platen 114 and the fixed platen 112, respectively. The molds 117 and 118 are disposed between the movable platen 114 and the fixed platen 112, facing each other. By moving the mold 117 in the X-axis direction using the mold clamping mechanism 116, the mold 117 and the mold 118 can be brought into close contact with each other, or the mold 117 can be separated from the mold 118. In the following description, the process of shifting the molds 117 and 118 from a separated state to a close contact state is referred to as "mold clamping". Also, the process of shifting the molds 117 and 118 from a close contact state to a separated state is referred to as "mold opening".

[0018] With the mold 117 and the mold 118 in close contact with each other in the mold clamping process, the inside of the mold is filled with molten material (resin), which is cooled and solidified, thereby molding a product (molded item) of a desired shape. After the product is molded, with the mold 117 separated from the mold 118 in the mold opening process, the molded product can be removed from the mold 117 by operating an ejection mechanism (not shown) arranged on the movable platen 114. The ejection mechanism is driven by a servo motor 152 arranged on the movable platen 114. The process of removing the product using the ejection mechanism is referred to as the "ejection" process.

[0019] The injection device 120 includes a base 121, a cylinder 122, an actuator 124, a hopper 125, and a temperature sensor 128. The base 121 is placed on the floor surface on the positive side of the X-axis of the bed 111, and the actuator 124 is mounted on its upper surface. A servo motor 153 for injection, a servo motor 154 for plasticization, and the like are arranged in the actuator 124.

[0020] The actuator 124 is provided with a cylinder 122 extending in the X-axis direction. The cylinder 122 includes a heater (not shown) for heating the inside, a screw 123, and an injection nozzle 126. The screw 123 is provided in the cylinder 122. The screw 123 is driven by a servo motor 154 in the actuator 124 and configured to be rotatable about the X-axis direction as a rotation axis. The screw 123 is also driven by a servo motor 153 and configured to be movable in the X-axis direction. The injection nozzle 126 is provided at the end of the cylinder 122 on the clamping device 110 side (i.e., the end in the negative direction of the X-axis). Bead-shaped resin material α is charged into the hopper 125. The cylinder 122 heats and melts the resin material α, and kneads it using the screw 123 to generate a molten material. The process of melting the resin material in this manner is called a "plasticization" process.

[0021] As described later, the screw 123 is moved in the X-axis direction by the actuator 124, whereby the injection molding machine 100 brings the injection nozzle 126 into contact with the sprue bush of the mold 118 in the mold clamping device 110. The injection molding machine 100 then injects the molten material from the injection nozzle 126, thereby filling the cavities of the molds 117, 118 with the molten material. In this manner, the nozzle touch mechanism is realized. The servo motor 153 applies pressure to the molten material by moving the screw 123 in the cylinder 122 in the negative direction of the X-axis, thereby injecting the molten material into the molds 117, 118 and maintaining a constant pressure of the molten material after injection.

[0022] The process of injecting the molten material into the molds 117, 118 is referred to as an "injection" process. After the injection process, the process of cooling the molten material filled in the molds 117, 118 while maintaining a constant pressure is referred to as a "pressure holding" process.

[0023] The temperature sensor 128 is disposed near the injection nozzle 126 in the cylinder 122. The temperature sensor 128 detects the temperature of the molten material inside the cylinder 122 and outputs the temperature to the control device 140. The control device 140 controls the heater based on the detection value of the temperature sensor 128 to adjust the temperature of the molten material to a desired temperature.

[0024] Once the dwell step is completed, the mold opening and ejection steps are carried out to remove the molded product.

[0025] The injection molding machine 100 can continuously form products by cyclically repeating a mold clamping process, an injection process, a pressure holding process, a plasticizing process, a mold opening process, and an ejection process. In this embodiment, the mold clamping process, the injection process, the pressure holding process, the plasticizing process, the mold opening process, and the ejection process are collectively referred to as a "molding cycle."

[0026] The control device 140 is stored inside the base 121. The control device 140 includes a CPU 141, a memory 142, and a servo amplifier 143 for driving each motor. The control device 140 acquires detection values ​​of various sensors arranged in the injection molding machine 100, and controls the injection molding machine 100 in an integrated manner.

[0027] The operation panel 130 is a device for an operator to operate the injection molding machine 100, and includes a display 132 that displays various images, and an input device such as a keyboard. The operation panel 130 is connected to the control device 140, and can acquire and display the status of the injection molding machine 100, and output operation signals input by a user from the input device to the control device 140. The operation panel 130 may be a touch panel in which the display 132 and the input device are integrated. The operation panel 130 may be attached to the bed 111 or base 121 of the injection molding machine 100, or may be disposed in a position independent of the injection molding machine 100.

[0028] [Operating device configuration] Fig. 2 is a diagram showing a detailed configuration of the actuator 124 in Fig. 1. In the following description of the actuator 124, Fig. 2 will be mainly referred to, but Fig. 1 will also be referred to as appropriate. Note that Fig. 2 shows a part of the cylinder 122 and a part of the screw 123. As explained in Fig. 1, the actuator 124 includes a servo motor 153 and a servo motor 154.

[0029] Furthermore, the actuation device 124 includes a fixed plate 27, an end plate 28, a linear guide 43, and a movable plate 30. The servo motor 154 is disposed on the movable plate 30. The servo motor 153 is disposed on the end plate 28. The fixed plate 27 and the end plate 28 are connected by a guide bar 31. The movable plate 30 is disposed on the linear guide 43. The linear guide 43 guides the movable plate 30 in the X-axis direction. In addition, the movable plate 30 moves in the X-axis direction while being guided by the guide bar 31.

[0030] A hole 33 is formed in the fixed plate 27, and the rear end of the cylinder 122 is fixed so that the hole 33 and the hole of the cylinder 122 are aligned. The rear end of the screw 123 passes through the hole 33 and is fixed to the rotary drive shaft 35. The rotary drive shaft 35 is also connected to an output shaft 47B of the reducer 47, which will be described later.

[0031] The actuation device 124 further includes a ball screw 39, a ball screw nut 38, a bearing 51, a first timing belt 61, a linear guide 43, and a first vibration sensor 81. The first vibration sensor 81 corresponds to the "first sensor" of the present disclosure. The bearing 51 is accommodated in the end plate 28. The bearing 51 rotatably supports a portion of the ball screw 39.

[0032] The ball screw nut 38 is fixed to the movable plate 30 via a reducer 47 described later. The ball screw nut 38 is attached to a ball screw 39. The ball screw 39 of the ball screw nut 38 penetrates the end plate 28, and the tip of the ball screw 39 protrudes from the end plate 28. A first pulley 41 is provided at this protruding part. A second pulley 42 is provided on the rotating shaft of the servo motor 153, and a first timing belt 61 is wound around the first pulley 41 and the second pulley 42. The first timing belt 61 transmits the power of the servo motor 153 to the ball screw 39.

[0033] Therefore, when the servo motor 153 is driven under the control of the control device 140, the power of the servo motor 153 is transmitted to the ball screw 39 by the first timing belt 61. Furthermore, when the ball screw 39 rotates due to the power, the ball screw nut 38 moves in the X-axis direction, and the movable plate 30 also moves in the X-axis direction. Then, due to the movement of the movable plate 30 in the X-axis direction, the screw 123 moves in the X-axis direction. As described above, when the servo motor 153 is driven under the control of the control device 140, the screw 123 moves in the X-axis direction.

[0034] The actuator 124 further includes a reducer 47, a second timing belt 62, a second bearing 52, and a load cell 68. The second bearing 52 rotatably supports the screw 123. The reducer 47 reduces the rotation of the rotating shaft of the servo motor 154. A third pulley 48 is provided on an input shaft 47A of the reducer 47. A fourth pulley 49 is provided on the rotating shaft of the servo motor 154. A second timing belt 62 is wound around the third pulley 48 and the fourth pulley 49. The second timing belt 62 transmits the power of the servo motor 154 to the screw 123 via the rotary drive shaft 35. Therefore, when the servo motor 154 is driven by the control of the control device 140, the screw 123 rotates.

[0035] The load cell 68 is disposed on the movable plate 30. The load cell 68 detects the rotational torque of the output shaft 47B.

[0036] In this manner, the control device 140 drives the servo motor 153 and the servo motor 154 to rotate the ball screw 39, thereby controlling the screw 123. The servo motor 153, the servo motor 154, and the ball screw 39 correspond to a "first drive device 161" in this disclosure.

[0037] The first vibration sensor 81 is installed on the ball screw nut 38. For example, an acceleration sensor is used as the first vibration sensor 81. The first vibration sensor 81 detects a vibration value of the ball screw 39 (first driving device 161) while the ball screw 39 is being driven. The vibration value is used for abnormality detection processing of the ball screw 39 (first driving device 161). The first vibration sensor 81 corresponds to the "first sensor" in this disclosure. Furthermore, the vibration value of the ball screw 39 while being driven corresponds to the "first physical quantity" in this disclosure.

[0038] [Control device function block diagram] Fig. 3 is a functional block diagram of the control device 140. In the following description of the control device 140, Fig. 3 will be mainly referred to, but Fig. 1 and Fig. 2 will also be referred to as appropriate. The control device 140 has a motor control unit 146, an FFT (Fast Fourier Transform) unit 144, and a diagnosis unit 145.

[0039] The motor control unit 146 controls the motors (such as the servo motor 153 and the servo motor 154) of the injection molding machine 100. The motor control unit 146 drives the screw 123 by controlling the servo motor 153 and the servo motor 154 (see the description of FIG. 2).

[0040] In this embodiment, the motor control unit 146 drives the screw 123 not only to produce a molded product but also for the abnormality detection process and the flushing process. As described above, the abnormality detection process is a diagnostic process for detecting abnormalities in the first driving device 161 and the second driving device 162. In this embodiment, as the abnormality detection process, a process for detecting an abnormality in the first driving device 161 will be described, and a process for detecting an abnormality in the second driving device 162 will be described in another embodiment described later.

[0041] The flushing process is a process for removing resin remaining in the cylinder 122 (hereinafter also referred to as "residual resin"). The control device 140 executes the flushing process by executing at least one of the movement of the screw 123 and the rotation of the screw 123. The control device 140 executes the flushing process when a predetermined flushing condition is met or manually by a user. The flushing conditions include, for example, a condition that the injection molding machine 100 is started, a condition that a short-term stop (so-called a momentary stop) is performed, a condition that a resin is replaced, and the like. The flushing process of this embodiment includes a first flushing process and a second flushing process. Details of the flushing process will be described with reference to FIG. 4 and the like. The flushing conditions correspond to the "predetermined conditions" of this disclosure.

[0042] The first vibration sensor 81 outputs vibration data indicating a time series of vibration values ​​to the control device 140. The FFT unit 144 performs a Fourier transform on the vibration data to convert the vibration data into data in the frequency domain (hereinafter also referred to as "frequency data" or "frequency spectrum").

[0043] The converted frequency data is output to the diagnosis unit 145. The diagnosis unit 145 executes an abnormality detection process for the ball screw 39 (first driving device 161) based on the frequency data from the FFT unit 144. Then, the diagnosis unit 145 displays the result of the abnormality detection process (presence or absence of an abnormality in the first driving device 161) on the display 132.

[0044] [Main control flow of the control device 140] Next, the main control flow of the control device 140 will be described. Fig. 4 is a flowchart showing the control flow of the control device 140. In the following description of the control of the control device 140, Fig. 4 will be mainly referred to, but Figs. 1 to 3 will also be referred to as appropriate. The process of the flowchart in Fig. 4 is executed, for example, every predetermined period (for example, 1 second).

[0045] First, in step S2, the control device 140 judges whether the flushing condition described above is satisfied. If the flushing condition is satisfied (YES in step S2), the process proceeds to step S4. On the other hand, if the flushing condition is not satisfied (NO in step S2), the process in FIG. 4 ends.

[0046] In step S4, the control device 140 executes a first flushing process, which will be described later with reference to FIG.

[0047] After executing the process of step S4, in step S6, the control device 140 executes an acquisition process. The acquisition process is a process for acquiring a vibration value (first physical quantity) detected by the first vibration sensor 81 during a period in which the control device 140 controls the first driving device 161 to drive the screw 123. Details of the acquisition process will be described later with reference to FIG. 6. The acquisition process for acquiring the first physical quantity is also referred to as a "first acquisition process."

[0048] After executing the process of step S6, in step S8, the control device 140 executes the abnormality detection process. As described above, the abnormality detection process is a process for detecting an abnormality in the first driving device 161 by using frequency data of the vibration value of the ball screw 39.

[0049] After the process of step S8 is executed, a second flushing process is executed in step S10. The second flushing process will be described later with reference to FIG.

[0050] After the process of step S10 is performed, the control device 140 performs a molding process (a process for generating a molded product) by, for example, manual operation by the user.

[0051] As also shown in FIG. 4, the period from when the first flushing process in step S4 is started to when the second flushing process is ended corresponds to the "period of the flushing process" of the present disclosure.

[0052] [First flushing process] Fig. 5 is a flowchart showing the flow of the first flushing process in step S4 in Fig. 4. In the following description of the first flushing process, Fig. 5 will be mainly referred to, but Fig. 1 will also be referred to as appropriate.

[0053] In step S42, the control device 140 judges whether or not the screw 123 is in the most forward position. The most forward position is the position where the screw 123 has moved the maximum amount in the advancing direction of the screw 123 (the negative direction of the X-axis in FIG. 1).

[0054] In step S42, if the screw 123 is in the most forward position (YES in step S42), the process in Fig. 5 ends. On the other hand, in step S42, if the screw 123 is not in the most forward position (NO in step S42), the process proceeds to step S44.

[0055] In step S44, the control device 140 advances the screw 123 to the most forward position. By the process of step S44, the control device 140 can discharge the residual resin present in the cylinder 122 in the advancing direction of the screw 123.

[0056] As described with reference to FIG. 5, the first flushing process is a flushing process for removing the remaining resin without introducing new resin into the cylinder 122.

[0057] [Acquisition process] Fig. 6 is a flowchart showing the flow of the acquisition process in step S6 in Fig. 4. In the following description of the control by the control device 140, Fig. 6 will be mainly referred to, but Figs. 1, 2, and 4 will also be referred to as appropriate.

[0058] In step S62, the control device 140 causes the screw 123 to move backward at a speed for the abnormality detection process (step S8 in FIG. 4) without rotating the screw 123. The speed is a predetermined speed. Then, the control device 140 acquires a vibration value detected by the first vibration sensor 81 (see FIG. 2) during the backward movement.

[0059] In step S64, the control device 140 determines whether the screw 123 has reached a predetermined position. The predetermined position is a position that is determined in advance for the abnormality detection process (step S8 in FIG. 4). If the screw 123 has not reached the predetermined position in step S64 (NO in step S64), the control device 140 repeats the process of step S62 until the screw 123 reaches the predetermined position. If the screw 123 has reached the predetermined position in step S64 (YES in step S64), the process proceeds to step S66.

[0060] In step S66, the control device 140 advances the screw 123 at a speed for the abnormality detection process (step S8 in FIG. 4) without rotating the screw 123. The speed is a predetermined speed. Then, the control device 140 acquires a vibration value detected by the first vibration sensor 81 (see FIG. 2) during the advancement.

[0061] In step S68, the control device 140 determines whether the screw 123 has reached the most forward position (see step S42 in FIG. 5). If the screw 123 has not reached the most forward position in step S68 (NO in step S68), the control device 140 repeats the process of step S66 until the screw 123 reaches the most forward position. If the screw 123 has reached the most forward position in step S68 (YES in step S68), the process proceeds to step S70.

[0062] In step S70, the control device 140 determines whether the number of forward and backward movements has reached a specified number. The number of forward and backward movements is the number of times that the screw 123 has processed forward and backward. The forward and backward movement of the screw 123 refers to the reciprocation between a predetermined position in step S64 and the most forward position in step S68. In other words, the number of forward and backward movements is the number of times that the screw 123 has reciprocated. The specified number is a number that is set in advance, and is, for example, a value greater than or equal to 1.

[0063] In step S70, if the number of forward and backward movements has not reached the specified number (NO in step S70), the process returns to step S62. On the other hand, if the number of forward and backward movements has reached the specified number (YES in step S70), the acquisition process ends.

[0064] [Second flushing process] Fig. 7 is a flowchart showing the flow of the second flushing process in step S10 in Fig. 4. In the following description of the control by the control device 140, Fig. 7 will be mainly referred to, but Figs. 1, 2, and 4 will also be referred to as appropriate.

[0065] In step S102, the control device 140 fixes the position of the screw 123 and rotates the screw 123 at a predetermined flushing rotation speed.

[0066] Next, in step S104, the control device 140 determines whether or not a predetermined time has elapsed since the start of the process of step S102. The predetermined time is also referred to as a flushing rotation time. If the flushing rotation time has not elapsed (NO in step S104), the control device 140 repeats the process of step S102 until the flushing rotation time has elapsed. The control device 140 repeats the process of step S102 to extrude the remaining resin attached to the screw 123. This extrusion process is also referred to as an extrusion rotation operation. In step S104, if the flushing rotation time has elapsed (YES in step S104), the process proceeds to step S106.

[0067] In step S106, the control device 140 executes the rotation and retreat of the screw 123 at a speed for the flushing process.

[0068] Next, in step S108, the control device 140 judges whether or not the screw 123 has reached the flushing stroke position. The flushing stroke position is a predetermined position. If the screw 123 has not reached the flushing stroke position (NO in step S108), the control device 140 repeats the process of step S106 until the screw 123 reaches the flushing stroke position. The control device 140 repeats the process of step S106 to perform a metering operation of new resin. Note that the new resin is introduced into the injection molding machine 100 by the user before the process of step S106. If the screw 123 has reached the flushing stroke position (YES in step S108), the process proceeds to step S110.

[0069] In step S110, the control device 140 advances the screw 123 at an injection speed for the flushing process. The resin measured in step S106 is injected by the advancement of the screw 123. That is, the process of step S110 is an injection operation.

[0070] Next, in step S112, the control device 140 determines whether or not the screw 123 has reached the most forward position (see also step S44 in FIG. 5). If the screw 123 has not reached the most forward position (NO in step S112), the control device 140 repeats the process of step S110 until the screw 123 reaches the most forward position. If the screw 123 has reached the most forward position (YES in step S112), the process proceeds to step S114.

[0071] In step S114, the control device 140 determines whether the number of flushing operations has reached a specified number. The number of flushing operations is the number of flushing operations, which is a series of operations from the process in step S102 to the determination of YES in step S112. The specified number is a predetermined number, and is, for example, a value equal to or greater than 1.

[0072] In step S114, if the number of flushing operations has not reached the specified number (NO in step S114), the process returns to step S102. If the number of flushing operations has reached the specified number (YES in step S114), the second flushing process ends.

[0073] In the injection molding machine 100 of this embodiment, by performing the second flushing process using new resin, the remaining resin (residual resin that could not be removed by the first flushing process) adhering to the inner wall of the cylinder 122 can be injected (discharged) together with the new resin (see step S110). After the second flushing process is completed, the new resin remains, and the injection molding machine 100 performs the molding process using the remaining new resin. Therefore, the injection molding machine 100 can use the new resin without waste.

[0074] [Summary] (1) The injection molding machine 100 of this embodiment executes the flushing process when the flushing condition is satisfied and the molding process is stopped, or manually by the user. The flushing process is a process for driving the screw to remove the remaining resin remaining in the cylinder 122. Therefore, the injection molding machine 100 of this embodiment executes the acquisition process of the first physical amount (first acquisition process) during the flushing process (see FIG. 4). Then, the injection molding machine 100 detects an abnormality of the first drive device 161 based on the first physical amount. Therefore, the injection molding machine 100 does not need to stop the molding process only for the acquisition process of the first physical amount, and therefore, it is possible to suppress a decrease in productivity of the molded product. Moreover, since the injection molding machine 100 executes the (first acquisition process) during the flushing process (see FIG. 4), it is possible to execute the abnormality detection process without neglecting it.

[0075] 5 to 7 and the like, the flushing process (first flushing process and second flushing process) of this embodiment is a process for driving the screw 123, and the process for obtaining the first physical quantity is also a process for driving the screw 123. Therefore, the process for driving the screw 123 can be made common between the flushing process and the process for obtaining the first physical quantity, and therefore the process for obtaining the first physical quantity during the flushing process can be simplified.

[0076] (2) Furthermore, the injection molding machine 100 executes a first flushing process (step S4 in FIG. 4) and a second flushing process (step S10 in FIG. 4) as flushing processes. The first flushing process is a process for removing remaining resin without introducing new resin into the cylinder 122. Furthermore, the second flushing process is a process for introducing new resin into the cylinder 122 and removing remaining resin. Then, as shown in FIG. 4, the injection molding machine 100 executes a first acquisition process and a second flushing process after executing the first flushing process. Therefore, the injection molding machine 100 executes the first acquisition process after removing remaining resin by the first flushing process, and therefore can acquire the first physical quantity with high accuracy.

[0077] (3) For example, a configuration may be considered in which the acquisition process of step S6 is executed after the second flushing process of step S10. However, in such a configuration, the new resin measured in the second flushing process may be damaged by the acquisition process (driving process of the screw 123). In this case, the quality of the molded product generated in the molding process after the acquisition process may be degraded. Therefore, as described in FIG. 4, the injection molding machine 100 of this embodiment executes the first acquisition process after the first flushing process and before the second flushing process. Therefore, it is possible to suppress the deterioration of the quality of the molded product generated in the molding process.

[0078] (4) Also, as shown in FIG. 5, in the first flushing process, when the movement amount of the screw 123 in the advancing direction is not the maximum amount (NO in step S42), the control device 140 drives the screw 123 so that the movement amount of the screw 123 becomes the maximum amount (positions the screw 123 at the most forward position). Therefore, the control device 140 can remove the remaining resin. Also, generally, when the screw 123 is in the most forward position (the movement amount of the screw 123 is the maximum amount), almost no resin remains in the cylinder 122 (the amount of remaining resin is extremely small). Therefore, when the movement amount of the screw 123 is the maximum amount (YES in step S42), no process is executed. Therefore, the injection molding machine 100 can reduce the driving cost of the screw 123.

[0079] <Second embodiment> In the first embodiment, the configuration has been described in which the device for which abnormality is detected by the injection molding machine 100 is the first driving device 161. In the second embodiment, the devices for which abnormality is detected by the injection molding machine 100 are the first driving device 161 and the second driving device 162.

[0080] The main process of the injection molding machine 100 of the second embodiment is a process in which the acquisition process of step S6 in Fig. 4 is replaced by an acquisition process of step S6A. Fig. 8 is a flowchart showing the flow of the acquisition process of step S6A. In the following description of the acquisition process, Fig. 8 will be mainly referred to, but Figs. 1 and 4 will also be referred to as appropriate.

[0081] In step S122, the control device 140 executes the forward / reverse movement process of the screw 123 described above, and acquires vibration values ​​detected by the first vibration sensor 81 while the forward / reverse movement process of the screw 123 is being executed (while the screw 123 is being driven). That is, in step S122, the control device 140 acquires vibration values ​​detected by the first vibration sensor 81 during one reciprocation of the screw 123. The process of acquiring the vibration values ​​corresponds to the "first acquisition process" of the present disclosure.

[0082] The process of step S122 ends when the driving (movement) of the screw 123 stops. When the process of step S122 ends, the process proceeds to step S124.

[0083] In step S124, the control device 140 controls the second driving device 162 (see FIG. 1 ) to execute forward / backward movement processing of the movable platen 114. The forward / backward movement processing of the movable platen 114 is a processing in which the movable platen 114 reciprocates between a most forward position and a most rearward position in a movement direction (X-axis direction) of the movable platen 114. In step S124, the control device 140 acquires a vibration value detected by the second vibration sensor 82 during execution of the forward / backward movement processing of the movable platen 114 (during driving of the movable platen 114). That is, in step S124, the control device 140 acquires a vibration value detected by the second vibration sensor 82 during one reciprocation of the movable platen 114. The processing of acquiring the vibration value in step S124 corresponds to a "second acquisition processing" in the present disclosure.

[0084] The process of step S124 ends when the driving (movement) of the movable platen 114 stops. When the process of step S124 ends, the process proceeds to step S126.

[0085] In step S126, the control device 140 determines whether the number of times the first acquisition process in step S122 and the second acquisition process in step S124 have been executed has reached a specified number. In this embodiment, the control device 140 counts the number of times the acquisition process has been executed as one time when one execution of the first acquisition process and one execution of the second acquisition process have been executed.

[0086] In step S126, if the number of times the acquisition process has been executed has not reached the specified number of times (NO in step S126), the control device 140 repeats the processes in steps S122 and S124 until the number of times the acquisition process has been executed reaches the specified number of times.

[0087] In step S126, when the number of times the acquisition process has been executed reaches the specified number (YES in step S126), the acquisition process in Fig. 8 ends, and the process proceeds to step S8 (see Fig. 4). In this step S8, the control device 140 detects an abnormality in the first drive device 161 based on the vibration value of the first vibration sensor 81 acquired by the first acquisition process (step S122) executed the specified number of times. At the same time, in this step S8, the control device 140 detects an abnormality in the second drive device 162 based on the vibration value of the second vibration sensor 82 acquired by the second acquisition process executed the specified number of times.

[0088] According to this configuration, the control device 140 executes the second acquisition process (step S124 in FIG. 8). Then, the control device 140 detects an abnormality in the second drive device 162 based on the vibration value acquired by the second acquisition process (step S8 in FIG. 4). Therefore, the injection molding machine 100 can detect an abnormality in not only the first drive device 161 but also the second drive device 162.

[0089] Furthermore, the control device 140 executes one first acquisition process and one second acquisition process individually a specified number of times. In other words, the control device 140 executes the first acquisition process and the second acquisition process alternately a specified number of times. Therefore, the control device 140 can execute the second acquisition process in a state in which the influence of the change in the parameter of the first drive device 161 due to the first acquisition process is suppressed. Furthermore, the control device 140 can execute the first acquisition process in a state in which the influence of the change in the parameter of the second drive device 162 due to the second acquisition process is suppressed.

[0090] The parameters of the first drive device 161 and the second drive device 162 are set to the temperature of the first drive device 161 and the temperature of the second drive device 162, respectively. In this case, when the control device 140 executes the first acquisition process, the screw 123 is driven, and the temperature of the first drive device 161 (for example, the ball screw 39) rises. However, when the control device 140 executes the second acquisition process after the first acquisition process, the first acquisition process is completed, and therefore the temperature of the first drive device 161 drops during the second acquisition process. Therefore, the control device 140 can execute the first acquisition process again in a state where the temperature of the first drive device 161 has dropped (that is, in a state where the influence of the change in the parameter of the first drive device 161 is suppressed). Therefore, the control device 140 can acquire a vibration value with high accuracy by the first acquisition process.

[0091] Similarly, when the control device 140 executes the second acquisition process, it drives the movable platen 114 (see FIG. 1), and thus the temperature of the second driving device 162 (for example, the ball screw 119) rises. However, when the control device 140 executes the first acquisition process after the second acquisition process, the second acquisition process is completed, and therefore the temperature of the second driving device 162 drops during the first acquisition process. Therefore, the control device 140 can execute the second acquisition process again in a state in which the temperature of the second driving device 162 has dropped (i.e., in a state in which the influence of the change in the parameters of the second driving device 162 is suppressed). Therefore, the control device 140 can acquire a vibration value with high accuracy by the second acquisition process.

[0092] Also, a configuration is adopted in which a supply device (not shown) is provided to supply lubricant to the bearing 51 (see FIG. 2) of the ball screw 39 of the first driving device 161 and the bearing (not shown) of the ball screw 119 of the second driving device 162 at predetermined intervals. When such a configuration is adopted, the parameters of the first driving device 161 and the parameters of the second driving device 162 are set to the lubricant film thickness of the bearing 51 of the first driving device 161 and the lubricant film thickness of the bearing of the second driving device 162, respectively.

[0093] In this case, when the control device 140 executes the first acquisition process, the screw 123 is driven, and the lubricant film thickness of the first driving device 161 decreases. However, when the control device 140 executes the second acquisition process after the first acquisition process, the first acquisition process is terminated, and the lubricant film thickness of the first driving device 161 increases during the second acquisition process as the supply device supplies the lubricant film thickness of the first driving device 161. Therefore, the control device 140 can execute the first acquisition process again in a state where the lubricant film thickness of the first driving device 161 has increased (i.e., in a state where the influence of the change in the parameters of the first driving device 161 is suppressed). Therefore, the control device 140 can acquire a vibration value with high accuracy by the first acquisition process.

[0094] Similarly, when the control device 140 executes the second acquisition process, the control device 140 drives the movable platen 114 (see FIG. 1), so that the lubricant film thickness of the second driving device 162 decreases. However, when the control device 140 executes the first acquisition process after the second acquisition process, the second acquisition process is completed, so that the lubricant film thickness of the second driving device 162 increases during the first acquisition process by the supply device supplying the lubricant film thickness of the second driving device 162. Therefore, the control device 140 can execute the second acquisition process again in a state where the lubricant film thickness of the second driving device 162 has increased (i.e., in a state where the influence of the change in the parameters of the second driving device 162 is suppressed). Therefore, the control device 140 can acquire a vibration value with high accuracy by the second acquisition process.

[0095] Moreover, both the physical quantity (first physical quantity) acquired in the first acquisition process and the physical quantity (second physical quantity) acquired in the second acquisition process are vibration values. Suppose that the execution period of the first acquisition process and the execution period of the second acquisition process are overlapped. However, during the overlapping period (hereinafter also referred to as the "overlapping period"), the vibration generated during the execution of the first acquisition process is transmitted to the second vibration sensor 82, so that the vibration value detected by the second vibration sensor 82 contains noise. In addition, during the overlapping period, the vibration generated during the execution of the second acquisition process is transmitted to the first vibration sensor 81, so that the vibration value detected by the first vibration sensor 81 contains noise. Therefore, the control device 140 acquires vibration values ​​with low accuracy from the first vibration sensor 81 and the second vibration sensor 82.

[0096] In contrast, in this embodiment, as shown in Fig. 8, the control device 140 executes the first acquisition process and the second acquisition process so that the execution period of the first acquisition process and the execution period of the second acquisition process do not overlap. Therefore, the accuracy of the vibration value acquired by the control device 140 can be ensured.

[0097] <Third embodiment> In the acquisition process of step 6A in the second embodiment (see FIG. 8), the injection molding machine 100 is described as alternately executing the first acquisition process and the second acquisition process a specified number of times. The acquisition process in the third embodiment is a process in which the first acquisition process is individually executed a specified number of times, and the second acquisition process is individually executed a specified number of times.

[0098] The main process of the injection molding machine 100 of the third embodiment is a process in which the acquisition process of step S6 in Fig. 4 is replaced by an acquisition process of step S6B. Fig. 9 is a flowchart showing the flow of the acquisition process of step S6B. In the following description of the acquisition process, Fig. 9 will be mainly referred to, but Fig. 8 will also be referred to as appropriate.

[0099] In step S122, the control device 140 executes the first acquisition process. Next, in step S134, the control device 140 determines whether the number of times the first acquisition process has been executed has reached a specified number of times. In step S134, if the number of times the first acquisition process has been executed has not reached the specified number of times (NO in step S134), the process returns to step S122. The control device 140 repeats the first acquisition process until the number of times the first acquisition process has been executed has reached the specified number of times. Then, if the number of times the first acquisition process has been executed has reached the specified number of times (YES in step S134), the process proceeds to step S124.

[0100] In step S124, the control device 140 executes the second acquisition process. Next, in step S138, the control device 140 determines whether the number of times the second acquisition process has been executed has reached a specified number of times. In step S138, if the number of times the second acquisition process has been executed has not reached the specified number of times (NO in step S138), the process returns to step S124. The control device 140 repeats the second acquisition process until the number of times the second acquisition process has been executed has reached the specified number of times. Then, if the number of times the second acquisition process has been executed has reached the specified number of times (YES in step S138), the acquisition process of step S6B ends.

[0101] According to this configuration, the control device 140 executes the first acquisition process a specified number of times collectively, and also executes the second acquisition process a specified number of times. Therefore, the control device 140 can execute the first acquisition process and the second acquisition process smoothly. Note that the specified number of times in step S134 and the specified number of times in step S138 may be the same value, or may be different values.

[0102] <Fourth embodiment> The display 132 of the injection molding machine 100 of the fourth embodiment displays the end timing of the flushing process period (see FIG. 4) when the acquisition process (first acquisition process) and the process for detecting an abnormality in the first drive device 161 (abnormality detection process in step S8 in FIG. 4) are executed during the flushing process period (see FIG. 4).

[0103] Fig. 10 is a diagram showing a display example of the display 132 in the fourth embodiment. In the example of Fig. 10, the display 132 displays a timing A (A is a positive real number) minutes from the current time as the timing (end timing) when the flushing process period ends. Specifically, in the example of Fig. 10, the display 132 displays an image of the text "The flushing process and the abnormality detection process will end in A minutes."

[0104] The injection molding machine 100 of the fourth embodiment can make the user aware of the end timing of the flushing process period, thereby improving user convenience.

[0105] <Fifth embodiment> In the following, the process of detecting an abnormality in the first drive device 161 based on the vibration value detected by the first vibration sensor 81 is also referred to as the "first abnormality detection process," and the process of detecting an abnormality in the second drive device 162 based on the vibration value detected by the second vibration sensor 82 is also referred to as the "second abnormality detection process."

[0106] Fig. 11 is a diagram showing an example of a time series of processing of the injection molding machine 100 of the fifth embodiment. The horizontal axis in Fig. 11 and Fig. 12 described later indicates the time axis. It is assumed that the flushing condition is satisfied at timing t1. When the flushing condition is satisfied (timing t1), the control device 140 executes the first acquisition process without executing the second acquisition process during the flushing process. Then, the control device 140 executes the first abnormality detection process based on the vibration value acquired in the first acquisition process.

[0107] It is assumed that the flushing condition is satisfied again at timing t2 after timing t1. When the flushing condition is satisfied (timing t2), the control device 140 executes the second acquisition process without executing the first acquisition process during the flushing process. Then, the control device 140 executes the second abnormality detection process based on the vibration value acquired in the second acquisition process.

[0108] If the injection molding machine 100 executes both the first acquisition process and the second acquisition process during all flushing processes, the flushing process may become excessively long. Therefore, the injection molding machine 100 of the present embodiment executes the first acquisition process without executing the second acquisition process during any flushing process. Then, the injection molding machine 100 executes the second acquisition process without executing the first acquisition process during the next flushing process. Therefore, it is possible to prevent the flushing process from becoming excessively long while executing the first abnormality detection process and the second abnormality detection.

[0109] Sixth embodiment FIG. 12 is a diagram showing an example of a time series of processing of the injection molding machine 100 of the sixth embodiment. As shown in FIG. 12, the injection molding machine 100 of the sixth embodiment uses a predetermined period T. The predetermined period T includes, for example, at least one of a concept of a predetermined time and a concept of a predetermined number of shots. In other words, the passage of the predetermined period T includes at least one of "the concept that a predetermined time has passed" and "the concept that the injection molding machine 100 has executed a molding process for a predetermined number of shots." The predetermined time is, for example, one month, and the predetermined number of shots is, for example, the number of molded products produced in the month.

[0110] It is assumed that the flushing condition is satisfied at a timing t1. When the flushing condition is satisfied (at the timing t1), the control device 140 executes the flushing process, the acquisition process, and the abnormality detection process based on the vibration value acquired in the acquisition process during the flushing process.

[0111] It is assumed that the flushing condition is satisfied again at timing t2 after timing t1. Timing t2 is assumed to be a timing from timing t1 until a predetermined period T has elapsed. When the flushing condition is satisfied (timing t2), the control device 140 executes the flushing process but does not execute the acquisition process (abnormality detection process) during the flushing process.

[0112] It is assumed that the flushing condition is satisfied again at timing t3 after timing t2. Timing t3 is assumed to be a timing after a predetermined period T has elapsed since timing t1. When the flushing condition is satisfied (timing t3), the control device 140 executes a flushing process, an acquisition process, and an abnormality detection process based on the vibration value acquired in the acquisition process during the flushing process.

[0113] If the injection molding machine 100 executes the acquisition process and the abnormality detection process every time the flushing condition is satisfied, the efficiency of the molding process may decrease. Therefore, the injection molding machine 100 of this embodiment executes the flushing process without executing the acquisition process when the flushing condition is satisfied (timing t2) until a predetermined period T has elapsed since the acquisition process was executed during the flushing process (timing t1 in FIG. 12). Also, after a predetermined period has elapsed since the acquisition process was executed during the flushing process (timing t1), when the flushing condition is satisfied (timing t3), the injection molding machine 100 executes the flushing process, the acquisition process, and the first abnormality detection process during the flushing process.

[0114] In this way, the injection molding machine 100 executes the acquisition process during the flushing process only when the predetermined condition is satisfied after the predetermined period T has elapsed since the acquisition process was executed during the flushing process. Therefore, the injection molding machine 100 of this embodiment can suppress a decrease in efficiency of the molding process.

[0115] <Other embodiments> (1) In the above embodiment, the physical quantity used in the abnormality detection process of the drive device (first drive device 161 and second drive device 162) is a vibration value. However, the physical quantity used in the abnormality detection process of the drive device may be another value. The physical quantity may be the temperature of the drive device, the sound volume emitted from the drive device, the current or voltage supplied to a motor included in the drive device, the torque of the motor, etc.

[0116] (2) The abnormality detection process in step S8 of Fig. 4 has been described as being executed before the second flushing process. However, the control device 140 may execute the abnormality detection process at another time period. For example, the control device 140 may execute the abnormality detection process in parallel with the second flushing process, or may execute the abnormality detection process after the second flushing process has ended.

[0117] (3) In the above embodiment, the second driving device 162 is a driving device for driving the movable platen 114. However, the second driving device 162 may be a device for driving a predetermined member. The predetermined member includes, for example, at least one of the movable platen 114, the protruding mechanism, and the mechanism for measuring the resin.

[0118] [Note] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0119] (Item 1) A main ejection molding machine of the present disclosure includes a cylinder, a screw, a first drive device, a first sensor, and a control device. The cylinder contains resin. The screw is disposed within the cylinder. The first drive device drives the screw. The first sensor detects a first physical quantity of the first drive device. The control device executes a flushing process for removing remaining resin remaining within the cylinder by controlling the first drive device to drive the screw. The control device executes a first acquisition process for acquiring the first physical quantity detected by the first sensor during a period in which the control device controls the first drive device to drive the screw. The control device detects an abnormality in the first drive device based on the first physical quantity acquired by the first acquisition process. The control device executes the first acquisition process during the period in which the flushing process is executed.

[0120] (2) In the injection molding machine described in 1, the flushing process includes a first flushing process for removing remaining resin without introducing new resin into the cylinder, and a second flushing process for removing remaining resin by introducing new resin into the cylinder. After executing the first flushing process, the control device executes a first acquisition process and a second flushing process.

[0121] (Item 3) In the injection molding machine described in Item 2, after the second flushing process, the injection molding machine produces a molded product using new resin. The control device executes a first acquisition process after the first flushing process and before the second flushing process.

[0122] (Item 4) In the injection molding machine described in item 2 or 3, the first flushing process is a process of driving the screw so that the movement amount of the screw becomes the maximum amount when the movement amount of the screw in the advancing direction is not the maximum amount, and is a process of not executing any process when the movement amount is the maximum amount.

[0123] (Item 5) In the injection molding machine described in any one of items 1 to 4, the injection molding machine further includes a predetermined member, a second drive device, and a second sensor. The predetermined member is a member different from the screw. The second drive device drives the predetermined member. The second sensor detects a second physical quantity of the second drive device. The control device executes a second acquisition process to acquire the second physical quantity detected by the second sensor during a period in which the control device controls the second drive device to drive the predetermined member. The control device detects an abnormality in the second drive device based on the second physical quantity acquired by the second acquisition process.

[0124] (Item 6) In the injection molding machine described in item 5, the control device alternately executes the first acquisition process and the second acquisition process a prescribed number of times.

[0125] (Item 7) In the injection molding machine described in item 5, the control device executes the first acquisition process a specified number of times, and executes the second acquisition process a specified number of times.

[0126] (Item 8) In the injection molding machine described in Item 5, the control device executes the first acquisition process without executing the second acquisition process during the flushing process when a predetermined condition is satisfied. Also, the control device executes the second acquisition process without executing the first acquisition process during the flushing process when the next predetermined condition is satisfied.

[0127] (Item 9) In the injection molding machine described in any one of items 1 to 8, the control device executes a first acquisition process during a flushing process when a predetermined condition is met. Also, the control device executes the flushing process without executing the first acquisition process when the predetermined condition is met until a predetermined period has elapsed since the control device executed the first acquisition process during the flushing process. Then, the control device executes the first acquisition process during the flushing process when the predetermined condition is met after a predetermined period has elapsed since the control device executed the first acquisition process during the flushing process.

[0128] (Item 10) In the injection molding machine described in any one of items 1 to 9, the injection molding machine further includes a display that displays the end timing of the flushing process when the first acquisition process and the process for detecting an abnormality in the first drive device are executed during the flushing process.

[0129] (Item 11) In the present disclosure, an abnormality detection method for an injection molding machine is disclosed. The injection molding machine includes a cylinder, a screw, a first drive device, and a first sensor. The cylinder contains resin. The screw is disposed in the cylinder. The first drive device drives the screw. The first sensor detects a first physical quantity of the first drive device. The abnormality detection method includes performing a flushing process for removing remaining resin remaining in the cylinder by controlling the first drive device to drive the screw. The abnormality detection method also includes performing a first acquisition process for acquiring the first physical quantity detected by the first sensor during a period in which the first drive device is controlled to drive the screw. The abnormality detection method also includes detecting an abnormality in the first drive device based on the first physical quantity acquired by the first acquisition process. The abnormality detection method also includes performing the first acquisition process during a period in which the flushing process is performed.

[0130] With regard to the above-mentioned embodiments and modified examples, it has been intended from the outset of the application that the configurations described in the embodiments may be appropriately combined, including combinations not mentioned in the specification, to the extent that no inconvenience or contradiction arises.

[0131] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0132] 27 fixed plate, 28 end plate, 30 movable plate, 31 guide bar, 33 hole, 35 rotating drive shaft, 38, 137 ball screw nut, 39, 119 ball screw, 41 first pulley, 42 second pulley, 43 linear guide, 47 reducer, 47A input shaft, 47B output shaft, 48 third pulley, 49 fourth pulley, 51 bearing, 52 second bearing, 61 first timing belt, 62 second timing belt, 68 load cell, 81 first vibration sensor, 82 second vibration sensor, 100 injection molding machine, 110 mold clamping unit, 111 bed, 112 fixed platen, 113 mold clamping housing, 114 movable platen, 115 tie bar, 116 mold clamping mechanism, 117, 118 mold, 120 injection unit, 121 base, 122 Cylinder, 123 screw, 124 actuator, 125 hopper, 126 injection nozzle, 128 temperature sensor, 130 operation panel, 132 display, 140 control device, 142 memory, 143 servo amplifier, 144 FFT section, 145 diagnosis section, 146 motor control section, 151, 152, 153, 154 servo motor, 161 first drive device, 162 second drive device.

Claims

1. A cylinder for containing resin; A screw disposed within the cylinder; A first drive device that drives the screw; a first sensor that detects a first physical quantity of the first driving device; a control device that executes a flushing process for removing residual resin remaining in the cylinder by controlling the first drive device to drive the screw, the control device executes a first acquisition process to acquire the first physical quantity detected by the first sensor during a period in which the control device controls the first drive device to drive the screw; the control device detects an abnormality in the first drive device based on the first physical amount acquired by the first acquisition process; The control device executes the first acquisition process during the flushing process.

2. The flushing process includes: a first flushing process for removing the remaining resin without introducing new resin into the cylinder; a second flushing process for introducing new resin into the cylinder to remove the remaining resin; The injection molding machine according to claim 1 , wherein the control device executes the first acquisition process and the second flushing process after executing the first flushing process.

3. the injection molding machine produces a molded product using the new resin after performing the second flushing process; The injection molding machine according to claim 2 , wherein the control device executes the first acquisition process after the first flushing process and before the second flushing process.

4. The first flushing process includes: If the amount of movement of the screw in the advancing direction is not the maximum amount, the process drives the screw so that the amount of movement of the screw becomes the maximum amount, 4. The injection molding machine according to claim 2, wherein when the movement amount is the maximum amount, no processing is executed.

5. The injection molding machine further comprises: A predetermined member different from the screw; A second drive device that drives the predetermined member; a second sensor that detects a second physical quantity of the second drive device; the control device executes a second acquisition process to acquire the second physical quantity detected by the second sensor during a period in which the control device controls the second drive device to drive the predetermined member; The injection molding machine according to any one of claims 1 to 3, wherein the control device detects an abnormality in the second drive device based on the second physical quantity acquired by the second acquisition process.

6. The injection molding machine according to claim 5 , wherein the control device alternately executes the first acquisition process and the second acquisition process a specified number of times.

7. The injection molding machine according to claim 5 , wherein the control device executes the first acquisition process a specified number of times and executes the second acquisition process a specified number of times.

8. The control device includes: When a predetermined condition is satisfied, the first acquisition process is executed without executing the second acquisition process during the flushing process; The injection molding machine according to claim 5 , wherein the second acquisition process is executed without executing the first acquisition process during the flushing process when the following predetermined condition is satisfied:

9. The control device includes: When a predetermined condition is met, the first acquisition process is executed during the flushing process; During the flushing process, if the predetermined condition is satisfied until a predetermined period of time has elapsed since the first acquisition process was executed, the flushing process is executed without executing the first acquisition process; The injection molding machine according to any one of claims 1 to 3, wherein when the predetermined condition is satisfied after the predetermined period has elapsed since the first acquisition process was executed during the flushing process, the first acquisition process is executed during the flushing process.

10. The injection molding machine according to any one of claims 1 to 3, further comprising a display that displays the end timing of the flushing process period when the first acquisition process and the process for detecting an abnormality of the first drive device are executed during the flushing process period.

11. A method for detecting an abnormality in an injection molding machine, comprising: The injection molding machine includes: A cylinder for containing resin; A screw disposed within the cylinder; A first drive device that drives the screw; a first sensor that detects a first physical quantity of the first drive device; The abnormality detection method includes: performing a flushing process for removing residual resin remaining in the cylinder by controlling the first driving device to drive the screw; executing a first acquisition process for acquiring the first physical quantity detected by the first sensor during a period in which the first drive device is controlled to drive the screw; detecting an abnormality in the first drive device based on the first physical amount acquired by the first acquisition process; The method for detecting an abnormality in an injection molding machine includes executing the first acquisition process during the flushing process.

Images