Injection molding machine and abnormality detection method for injection molding machine

Abstract

The injection molding machine executes a first acquisition process for acquiring a physical quantity for abnormality detection of a first drive device during a flushing process.

Description

Technical Field

[0001] The present disclosure relates to an injection molding machine and an abnormality detection method of the injection molding machine. Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 2021-74917 discloses an injection molding machine equipped with a ball screw, which detects abnormality of the ball screw by performing frequency analysis on the vibration intensity of the ball screw. Summary of the invention

[0003] In the above-mentioned injection molding machine, the drive device (for example, the above-mentioned ball screw) is controlled in order to obtain the physical quantity (for example, the above-mentioned vibration intensity) of the drive device. However, in the above-mentioned injection molding machine, the control timing of the drive device is not considered. Therefore, in the above-mentioned injection molding machine, since the production of molded products is temporarily stopped to control the drive device, the problem of reduced productivity of molded products may occur. In addition, the injection molding machine may also have a problem that the abnormal detection process of the drive device itself is neglected.

[0004] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to suppress a decrease in the productivity of molded products and to accurately perform an abnormality detection process of a drive device.

[0005] The injection molding machine and the abnormality detection method of the injection molding machine disclosed in the present invention perform a first acquisition process of acquiring a first physical quantity in a flushing process, and the first physical quantity is detected by a first sensor during a period when a first drive device is controlled to drive a screw. In addition, the injection molding machine and the abnormality detection method of the injection molding machine disclosed in the present invention detect an abnormality of the first drive device based on the first physical quantity acquired by the first acquisition process.

[0006] The above and other objects, features, aspects and advantages of the present invention will be understood from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a diagram for explaining the structure of an injection molding machine.

[0008] Figure 2 It is a diagram showing the detailed structure of the working device.

[0009] Figure 3 It is a functional block diagram of the control device.

[0010] Figure 4 It is a flowchart which shows the control flow of a control device.

[0011] Figure 5 This is a flowchart showing the flow of the first rinse process.

[0012] Figure 6 : is a flowchart showing the flow of acquisition processing.

[0013] Figure 7 : is a flowchart showing the flow of the second rinse process.

[0014] Figure 8 This is a flowchart showing the flow of acquisition processing according to another embodiment.

[0015] Fig. 9 This is a flowchart showing the flow of acquisition processing according to another embodiment.

[0016] Fig.10 It is a diagram showing a display example of the display 132 .

[0017] Fig.11 This is a diagram showing an example of a time series of processing of the injection molding machine 100 according to another embodiment.

[0018] Fig.12 This is a diagram showing an example of a time series of processing of the injection molding machine 100 according to another embodiment. DETAILED DESCRIPTION

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same or corresponding parts in the drawings are denoted by the same reference numerals, and their description will not be repeated.

[0020] <First embodiment>

[0021] [Structure of injection molding machine]

[0022] Figure 1 1 is a diagram for explaining the structure of the injection molding machine 100. Figure 1 The floor surface on which the injection molding machine 100 is arranged is set as the XY plane, and the direction perpendicular to the floor surface is set as the Z-axis direction. Sometimes the positive direction of the Z-axis is called the upper surface side or the upper side, and the negative direction is called the lower surface side or the lower side. It should be noted that the injection molding machine 100 is shown as a horizontal injection molding machine, but is not limited to the horizontal type, and can also be a vertical injection molding machine. It should be noted that the X-axis direction is set as the extension direction of the cylinder 122 described later.

[0023] The injection molding machine 100 includes a mold clamping device 110 for clamping a mold, an injection device 120 for melting an injection material and injecting it, an operation panel 130, and a control device 140. Figure 1 In FIG. 1 , the mold clamping device 110 is arranged on the negative side of the X-axis with respect to the injection device 120 .

[0024] The mold clamping device 110 includes a machine base 111, a fixed platen 112, a mold clamping housing 113, a movable platen 114, a tie rod 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 machine base 111 is arranged on the floor surface, and the fixed platen 112, the mold clamping housing 113, the movable platen 114 and other devices are mounted on its upper surface.

[0025] The fixed plate 112 is fixed to the end of the machine base 111 on the side close to the injection device 120 (i.e., the positive direction of the X axis). The mold clamping case 113 is arranged on the end of the machine base 111 on the negative direction of the X axis. The fixed plate 112 and the mold clamping case 113 are connected by a tie rod 115 including a plurality of rods. The mold clamping case 113 can move in the X axis direction on the machine base 111.

[0026] The movable plate 114 is arranged between the fixed plate 112 and the mold closing housing 113 on the machine base 111. The movable plate 114 is configured to be movable in the X-axis direction. The mold closing housing 113 and the movable plate 114 are connected by a mold closing mechanism 116. The mold closing mechanism 116 has a toggle mechanism. The toggle mechanism is connected to the ball screw 119 via a ball screw nut 137. In addition, by driving the servo motor 151 arranged in the mold closing housing 113 to rotate the ball screw 119, the movable plate 114 can be relatively moved in the X-axis direction relative to the mold closing housing 113. It should be noted that as the mold closing mechanism 116, a direct-acting cylinder driven by hydraulic pressure can also be used.

[0027] In this way, the control device 140 drives the servomotor 151 to rotate the ball screw 119 to control the movable platen 114. The servomotor 151 and the ball screw 119 correspond to the "second drive device 162" of the present disclosure. The movable platen 114 corresponds to the "prescribed member" of the present disclosure.

[0028] The second vibration sensor 82 is provided on the ball screw nut 137. As the second vibration sensor 82, for example, an acceleration sensor is used. The second vibration sensor 82 detects the vibration value of the ball screw 119 being driven by the ball screw 119 (the second drive device 162). The vibration value is used for abnormality detection processing of the ball screw 119 (the second drive device 162). The second vibration sensor 82 corresponds to the "second sensor" of the present disclosure. In addition, the vibration value of the ball screw 119 being driven corresponds to the "second physical quantity" of the present disclosure.

[0029] Molds 117 and 118 are arranged on the movable platen 114 and the fixed platen 112, respectively. Molds 117 and 118 are arranged to face each other between the movable platen 114 and the fixed platen 112. By moving mold 117 in the X-axis direction using mold clamping mechanism 116, molds 117 and 118 can be brought into close contact or molds 118 and 117 can be separated. In the following description, the process of changing molds 117 and 118 from a separated state to a closely contacted state is referred to as "mold clamping". In addition, the process of changing molds 117 and 118 from a closely contacted state to a separated state is referred to as "mold opening".

[0030] In a state where the mold 117 and the mold 118 are tightly fitted by the mold closing process, the molten material (resin) is filled into the mold and cooled to solidify, thereby forming a product (molded product) of a desired shape. After the product is formed, in a state where the mold 117 and the mold 118 are separated by the mold opening process, the molded product can be taken out of the mold 117 by operating a protrusion mechanism (not shown) arranged on the movable plate 114. The protrusion mechanism is driven by a servo motor 152 arranged on the movable plate 114. It should be noted that the process of taking out the product using the protrusion mechanism is called a "protrusion" process.

[0031] The injection device 120 includes a base 121, a cylinder 122, a working device 124, a hopper 125, and a temperature sensor 128. The base 121 is arranged on the floor surface on the positive direction side of the X-axis of the machine base 111, and the working device 124 is mounted on its upper surface. The working device 124 is arranged with a servo motor 153 for injection and a servo motor 154 for plasticization.

[0032] A cylinder 122 extending in the X-axis direction is arranged in the working device 124. The cylinder 122 includes a heater (not shown) for heating the interior, a screw 123, and an injection nozzle 126. The screw 123 is arranged in the cylinder 122. The screw 123 is driven by a servo motor 154 in the working device 124, and is configured to be able to rotate with the X-axis direction as the rotation axis. In addition, the screw 123 is driven by the servo motor 153, and is configured to be able to move in the X-axis direction. The injection nozzle 126 is arranged at the end of the cylinder 122 on the side of the mold clamping device 110 (that is, the end in the negative direction of the X-axis). Bead-shaped resin material α is added to the hopper 125. The cylinder 122 heats and melts the resin material α, and generates a molten material by kneading using the screw 123. In this way, the process of melting the resin material is called a "plasticization" process.

[0033] In addition, as described later, by moving the screw 123 in the X-axis direction using the working device 124, the injection molding machine 100 brings the injection nozzle 126 into contact with the sprue bushing of the mold 118 in the mold clamping device 110. Then, the injection molding machine 100 injects the molten material from the injection nozzle 126 to fill the cavities of the molds 117 and 118 with the molten material. The configuration of the nozzle contact mechanism is realized by the above. 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, injects the molten material into the molds 117 and 118, and keeps the pressure of the injected molten material constant.

[0034] The process of injecting the molten material into the molds 117 and 118 is called an "injection" process. The process of cooling the molten material filled into the molds 117 and 118 at a constant pressure after the injection process is called a "pressure holding" process.

[0035] 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.

[0036] When the pressure holding process is completed, the mold opening process and the protruding process are performed to take out the molded product.

[0037] The injection molding machine 100 can continuously form a product by periodically repeating the mold closing process, injection process, pressure holding process, plasticizing process, mold opening process and protruding process. In this embodiment, the mold closing process, injection process, pressure holding process, plasticizing process, mold opening process and protruding process are also collectively referred to as a "molding cycle".

[0038] The control device 140 is accommodated 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 provided in the injection molding machine 100 and controls the injection molding machine 100 in a unified manner.

[0039] The operation panel 130 is a device for the operator to operate the injection molding machine 100, and includes a display 132 that displays various images and input devices such as a keyboard. The operation panel 130 is connected to the control device 140, and can obtain and display the state of the injection molding machine 100, or output the operation signal input by the user from the input device to the control device 140. The operation panel 130 can also be a touch panel that integrates the display 132 and the input device. In addition, the operation panel 130 can be installed on the base 111 or the base 121 of the injection molding machine 100, or it can be arranged at a position independent of the injection molding machine 100.

[0040] [Working device configuration]

[0041] Figure 2 It is shown Figure 1 The following description of the working device 124 mainly refers to Figure 2 , but also appropriate reference Figure 1 It should be noted that Figure 2 A portion of the cylinder 122 and a portion of the screw 123 are shown in FIG. Figure 1 It is also explained that the working device 124 includes a servo motor 153 and a servo motor 154 .

[0042] In addition, the working 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 arranged on the movable plate 30. The servo motor 153 is arranged on the end plate 28. The fixed plate 27 and the end plate 28 are connected by a guide rod 31. The movable plate 30 is arranged 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 is guided by the guide rod 31 and moves in the X-axis direction.

[0043] The fixing plate 27 is provided with a hole 33, and the rear end of the cylinder 122 is fixed so that the hole 33 matches the hole of the cylinder 122. The rear end of the screw 123 passes through the hole 33 and is fixed to the rotation drive shaft 35. The rotation drive shaft 35 is connected to the output shaft 47B of the speed reducer 47 described later.

[0044] The working 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 part of the ball screw 39.

[0045] The ball screw nut 38 is fixed to the movable plate 30 by means of a speed reducer 47 described later. The ball screw nut 38 is mounted on the ball screw 39. The ball screw 39 of the ball screw nut 38 penetrates the end plate 28 so that the front end of the ball screw 39 protrudes from the end plate 28. A first pulley 41 is provided at the protruding portion. A second pulley 42 is provided on the rotating shaft of the servo motor 153, and a first synchronous belt 61 is wound around the first pulley 41 and the second pulley 42. The first synchronous belt 61 transmits the power of the servo motor 153 to the ball screw 39.

[0046] Therefore, when the servo motor 153 is driven by the control of the control device 140, the power of the servo motor 153 is transmitted to the ball screw 39 through the first timing belt 61. In addition, the ball screw 39 rotates under the action of the power, so that the ball screw nut 38 moves in the X-axis direction, and the movable plate 30 also moves in the X-axis direction. And, the screw 123 moves in the X-axis direction due to the movement of the movable plate 30 in the X-axis direction. As described above, when the servo motor 153 is driven by the control of the control device 140, the screw 123 moves in the X-axis direction.

[0047] The working device 124 also includes a speed reducer 47, a second timing belt 62, a second bearing 52 and a force sensor 68. The second bearing 52 supports the screw 123 so that it can rotate. The speed reducer 47 reduces the rotation of the rotating shaft of the servo motor 154. In addition, a third pulley 48 is provided on the input shaft 47A of the speed reducer 47. In addition, a fourth pulley 49 is provided on the rotating shaft of the servo motor 154. In addition, the 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 rotating drive shaft 35. Therefore, when the servo motor 154 is driven by the control of the control device 140, the screw 123 rotates.

[0048] The load cell 68 is disposed on the movable plate 30. The load cell 68 detects the rotation torque of the output shaft 47B.

[0049] In this manner, the control device 140 drives the servomotors 153 and 154 to rotate the ball screw 39, thereby controlling the screw 123. The servomotors 153, 154, and the ball screw 39 correspond to the "first drive device 161" of the present disclosure.

[0050] The first vibration sensor 81 is provided on the ball screw nut 38. As the first vibration sensor 81, for example, an acceleration sensor is used. The first vibration sensor 81 detects the vibration value of the ball screw 39 being driven by the ball screw 39 (first drive device 161). The vibration value is used for abnormality detection processing of the ball screw 39 (first drive device 161). The first vibration sensor 81 corresponds to the "first sensor" of the present disclosure. In addition, the vibration value of the ball screw 39 being driven corresponds to the "first physical quantity" of the present disclosure.

[0051] [Functional block diagram of control device]

[0052] Figure 3 1 is a functional block diagram of the control device 140. In the following description of the control device 140, reference is mainly made to Figure 3 , but also appropriate reference Figure 1 and Figure 2 The control device 140 includes a motor control unit 146 , an FFT (Fast Fourier Transform) unit 144 , and a diagnosis unit 145 .

[0053] 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 (see Figure 2 ).

[0054] In this embodiment, the motor control unit 146 drives the screw 123 not only to generate the molded product, but also for abnormality detection processing and flushing processing. As described above, the abnormality detection processing is a diagnostic processing for detecting abnormalities of the first drive device 161 and the second drive device 162. In the present embodiment, the processing for detecting abnormalities of the first drive device 161 is described as the abnormality detection processing, and the processing for detecting abnormalities of the second drive device 162 is described in another embodiment described later.

[0055] Flushing is a process for removing the resin remaining in the cylinder 122 (hereinafter also referred to as "residual resin"). The control device 140 performs the flushing by executing at least one of the movement of the screw 123 and the rotation of the screw 123. The control device 140 performs the flushing when a predetermined flushing condition is met or manually by the user. The flushing conditions include, for example, conditions for starting the injection molding machine 100, conditions for performing a short-term stop (so-called intermittent stop), conditions for performing resin replacement, and the like. The flushing process of this embodiment includes a first flushing process and a second flushing process. The details of the flushing process are described in detail below. Figure 4 The flushing conditions correspond to the "prescribed conditions" of the present disclosure.

[0056] The first vibration sensor 81 outputs time-series vibration data indicating vibration values ​​to the control device 140. The FFT unit 144 transforms the vibration data into data in the frequency domain (hereinafter also referred to as "frequency data" or "spectrum") by performing Fourier transform on the vibration data.

[0057] The converted frequency data is output to the diagnostic unit 145. The diagnostic unit 145 performs abnormality detection processing of the ball screw 39 (first drive device 161) based on the frequency data from the FFT unit 144. The result of the abnormality detection processing (whether the first drive device 161 is abnormal) is displayed on the display 132.

[0058] [Main control flow of the control device 140]

[0059] Next, a main control flow of the control device 140 will be described. Figure 4 140 is a flowchart showing the flow of control by the control device 140. In the following description of the control by the control device 140, reference is mainly made to Figure 4 , but also appropriate reference Figure 1 to Figure 3 . Figure 4 The processing of the flowchart is executed, for example, every predetermined period (for example, 1 second).

[0060] First, in step S2, the control device 140 determines whether the above-mentioned flushing condition is satisfied or not. 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), Figure 4 The processing is finished.

[0061] In step S4, the control device 140 performs the first flushing process. Figure 5 The first rinse process will be described.

[0062] After executing the process of step S4, in step S6, the control device 140 executes an acquisition process. The acquisition process is a process in which the control device 140 acquires the vibration value (first physical quantity) detected by the first vibration sensor 81 while the control device 140 controls the first drive device 161 to drive the screw 123. The details of the acquisition process will be described later. Figure 6 It should be noted that the acquisition process for acquiring the first physical quantity is also referred to as "first acquisition process".

[0063] After executing the process of step S6 , the control device 140 executes an abnormality detection process in step S8 . As described above, the abnormality detection process is a process for detecting an abnormality of the first drive device 161 using the frequency data of the vibration value of the ball screw 39 .

[0064] After the process of step S8 is executed, the second flushing process is executed in step S10. The second flushing process described below Figure 7 To explain.

[0065] After the process of step S10 is executed, the control device 140 is caused to execute a molding process (a process of producing a molded product) by, for example, a manual operation of a user.

[0066] like Figure 4 As shown in FIG. 1 , the period from when the first rinse process in step S4 starts to when the second rinse process ends corresponds to the “rinsing process period” in the present disclosure.

[0067] [First rinse process]

[0068] Figure 5 It is shown Figure 4 The flowchart of the process of the first rinsing process in step S4 is mainly referred to in the following description of the first rinsing process. Figure 5 , but also appropriate reference Figure 1 .

[0069] In step S42, the control device 140 determines whether the screw rod 123 is at the most advanced position. The most advanced position is the direction of travel of the screw rod 123 (see Figure 1 The position where the screw rod 123 moves the maximum amount (in the negative direction of the X-axis).

[0070] In step S42, when the screw 123 is at the most advanced position (YES in step S42), Figure 5 On the other hand, in step S42, when the screw 123 is not in the most advanced position (No in step S42), the process proceeds to step S44.

[0071] In step S44 , the control device 140 advances the screw 123 to the most advanced position. The control device 140 can discharge the residual resin existing in the cylinder 122 in the advancing direction of the screw 123 by the process of step S44 .

[0072] If Figure 5 As described above, the first flushing process is a flushing process for removing the residual resin without introducing new resin into the cylinder 122 .

[0073] [Get Process]

[0074] Figure 6 It is shown Figure 4 In the following description of the control of the control device 140, reference is mainly made to Figure 6 , but also appropriate reference Figure 1 , Figure 2 and Figure 4.

[0075] In step S62, the control device 140 does not rotate the screw 123 but performs abnormality detection processing ( Figure 4 The screw 123 is retracted at a speed of 100° (step S8). The speed is a predetermined speed. In addition, the control device 140 obtains the first vibration sensor 81 (see FIG. 14) during the retraction. Figure 2 )The detected vibration value.

[0076] In step S64, the control device 140 determines whether the screw 123 has reached a predetermined position. The predetermined position is for abnormality detection processing ( Figure 4 If the screw 123 does not reach 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. In step S64, if the screw 123 reaches the predetermined position (Yes in step S64), the process proceeds to step S66.

[0077] In step S66, the control device 140 does not rotate the screw 123 but performs abnormality detection processing ( Figure 4 The screw 123 is advanced at a speed determined in advance. The control device 140 obtains the vibration signal generated by the first vibration sensor 81 (see Figure 2 )The detected vibration value.

[0078] In step S68, the control device 140 determines whether the screw 123 has reached the most advanced position (see Figure 5 If the screw 123 has not reached the most advanced 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 advanced position. In step S68, if the screw 123 reaches the most advanced position (Yes in step S68), the process proceeds to step S70.

[0079] In step S70, the control device 140 determines whether the number of forward and backward movements reaches a specified number of times. The number of forward and backward movements is the number of times the screw 123 moves forward and backward. The forward and backward movement of the screw 123 refers to the reciprocation between the specified position of step S64 and the most advanced position of step S68. In other words, the number of forward and backward movements is the number of times the screw 123 reciprocates. The specified number of times is a predetermined number, for example, a value greater than 1.

[0080] In step S70, if the number of forward and backward movements has not reached the prescribed number of times (No in step S70), the process returns to step S62. Otherwise, if the number of forward and backward movements has reached the prescribed number of times (Yes in step S70), the acquisition process ends.

[0081] [Second rinse process]

[0082] Figure 7 It is shown Figure 4 The following description of the control of the control device 140 mainly refers to Figure 7 , but also appropriate reference Figure 1 , Figure 2 and Figure 4 .

[0083] 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.

[0084] Next, in step S104, the control device 140 determines whether a specified time has passed since the start of the process of step S102. The specified time is also called the flushing rotation time. If the flushing rotation time has not passed (no in step S104), the control device 140 repeats the process of step S102 until the flushing rotation time has passed. The control device 140 extrude the residual resin attached to the screw 123 by repeating the process of step S102. This extrusion process is also called an extrusion rotation action. In step S104, if the flushing rotation time has passed (yes in step S104), the process enters step S106.

[0085] In step S106 , the control device 140 causes the speed screw 123 for the rinsing process to rotate and retract.

[0086] Next, in step S108, the control device 140 determines whether 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 performs a metering action of a new resin by repeating the process of step S106. It should be noted that the new resin is introduced into the injection molding machine 100 by the user before the process of step S106. When the screw 123 reaches the flushing stroke position (yes in step S108), the process enters step S110.

[0087] In step S110, the control device 140 advances the screw 123 at an injection speed for flushing. 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.

[0088] Next, in step S112, the control device 140 determines whether the screw 123 has reached the most advanced position (see also Figure 5 If the screw 123 has not reached the most advanced position (No in step S112), the control device 140 repeats the process of step S110 until the screw 123 reaches the most advanced position. If the screw 123 reaches the most advanced position (Yes in step S112), the process proceeds to step S114.

[0089] The control device 140 determines whether the number of flushing times has reached a predetermined number in step S114. The number of flushing times is the number of times a series of processes (flushing processes) are performed from the process in step S102 to the determination of yes in step S112. The predetermined number of times is a predetermined number, for example, a value greater than or equal to 1.

[0090] In step S114, if the number of flushing operations has not reached the predetermined number of times (No in step S114), the process returns to step S102. On the other hand, if the number of flushing operations has reached the predetermined number of times (Yes in step S114), the second flushing process ends.

[0091] The injection molding machine 100 of this embodiment can inject (discharge) the residual resin attached to the inner wall of the cylinder 122 (the residual resin that could not be removed in the first flushing process) together with the new resin by performing the second flushing process using the new resin (see step S110). In addition, the new resin remains after the second flushing process is completed, 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.

[0092] [summary]

[0093] (1) The injection molding machine 100 of this embodiment performs a 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 of driving the screw to remove the residual resin remaining in the cylinder 122. Therefore, the injection molding machine 100 of this embodiment performs a flushing process during the flushing process (see Figure 4) performs the acquisition process of the first physical quantity (first acquisition process). Then, the injection molding machine 100 detects the abnormality of the first drive device 161 based on the first physical quantity. Therefore, the injection molding machine 100 does not need to stop the molding process only for the acquisition process of the first physical quantity, so it is possible to suppress the reduction in the productivity of the molded product. In addition, the injection molding machine 100 stops during the flushing process (see Figure 4 ) executes (the first acquisition process), so the abnormality detection process can be performed without negligence.

[0094] In addition, if Figure 5 to Figure 7 As described in the above, the flushing process (the first flushing process and the second flushing process) of the present embodiment is a process of driving the screw 123, and the process of acquiring the first physical quantity is also a process of driving the screw 123. Therefore, since the process of driving the screw 123 can be made common in the flushing process and the process of acquiring the first physical quantity, the process of acquiring the first physical quantity during the flushing process can be made a simple process.

[0095] (2) In addition, the injection molding machine 100 performs the first flushing process ( Figure 4 Step S4) and the second rinse process ( Figure 4 The first flushing process is a process for removing the residual resin without introducing new resin into the cylinder 122. In addition, the second flushing process is a process for removing the residual resin by introducing new resin into the cylinder 122. Figure 4 As shown, the injection molding machine 100 performs the first acquisition process and the second acquisition process after performing the first flushing process. Therefore, the injection molding machine 100 performs the first acquisition process after removing the residual resin by the first flushing process, thereby being able to acquire the first physical quantity with high accuracy.

[0096] (3) For example, consider a configuration in which the acquisition process of step S6 is performed after the second flushing process of step S10. However, with 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 reduced. Therefore, if the injection molding machine 100 of this embodiment is Figure 4 As described above, the first acquisition process is executed after the first rinse process is executed and before the second rinse process is executed. Therefore, it is possible to suppress a decrease in the quality of the molded product produced in the molding process.

[0097] (4) In addition, Figure 5As shown, in the first flushing process, the control device 140 drives the screw 123 (makes the screw 123 at the most advanced position) when the movement amount of the screw 123 in the direction of travel is not the maximum amount (No in step S42) so that the movement amount of the screw 123 is the maximum amount. Therefore, the control device 140 can remove the residual resin. In addition, usually, when the screw 123 is at the most advanced position (the movement amount of the screw 123 is the maximum amount), there is almost no residual resin in the cylinder 122 (the amount of residual resin is very small). Therefore, when the movement amount of the screw 123 is the maximum amount (Yes in step S42), no processing is performed. Therefore, the injection molding machine 100 can reduce the driving cost of the screw 123.

[0098] <Second embodiment>

[0099] The configuration in which the device to be detected as abnormality in the injection molding machine 100 of the first embodiment is the first drive device 161 has been described. The devices to be detected as abnormality in the injection molding machine 100 of the second embodiment are the first drive device 161 and the second drive device 162 .

[0100] The main processing of the injection molding machine 100 of the second embodiment is Figure 4 The acquisition process of step S6 is replaced by the acquisition process of step S6A. Figure 8 1 is a flowchart showing the flow of the acquisition process of step S6A. Figure 8 , but also appropriate reference Figure 1 and Figure 4 .

[0101] In step S122, the control device 140 executes the above-mentioned forward and backward movement processing of the screw 123, and obtains the vibration value detected by the first vibration sensor 81 during the execution of the forward and backward movement processing of the screw 123 (during the driving of the screw 123). That is, in step S122, the control device 140 obtains the vibration value detected by the first vibration sensor 81 in one reciprocation of the screw 123. This process of obtaining the vibration value corresponds to the "first acquisition process" of the present disclosure.

[0102] The process of step S122 ends when the drive (movement) of the screw 123 stops. When the process of step S122 ends, the process proceeds to step S124.

[0103] In step S124, the control device 140 controls the second driving device 162 (see Figure 1), the forward and backward processing of the movable disk 114 is performed. The forward and backward processing of the movable disk 114 is a process in which the movable disk 114 reciprocates between the most advanced position and the most retracted position in the moving direction (X-axis direction) of the movable disk 114. In step S124, the control device 140 obtains the vibration value detected by the second vibration sensor 82 during the forward and backward processing of the movable disk 114 (during the driving of the movable disk 114). That is, in step S124, the control device 140 obtains the vibration value detected by the second vibration sensor 82 in one reciprocation of the movable disk 114. The process of obtaining the vibration value in step S124 corresponds to the "second acquisition process" of the present disclosure.

[0104] The process of step S124 ends when the driving (movement) of movable plate 114 stops. When the process of step S124 ends, the process proceeds to step S126.

[0105] In step S126, the control device 140 determines whether the acquisition processing execution times of the first acquisition processing of step S122 and the second acquisition processing of step S124 have reached a predetermined number of times. In this embodiment, the control device 140 counts the acquisition processing execution times as one when the first acquisition processing is executed once and the second acquisition processing is executed once.

[0106] In step S126 , when the acquisition processing execution count has not reached the prescribed count (No in step S126 ), the control device 140 repeats the processes of steps S122 and S124 until the acquisition processing execution count reaches the prescribed count.

[0107] In step S126, when the acquisition processing execution count reaches a predetermined number of times (Yes in step S126), Figure 8 The acquisition process is completed, and the process enters step S8 (see Figure 4 ). In 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 executing the first acquisition process (step S122) a predetermined number of times. At the same time, in 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 executing the second acquisition process a predetermined number of times.

[0108] According to this configuration, the control device 140 executes the second acquisition process ( Figure 8 Then, the control device 140 detects an abnormality of the second drive device 162 based on the vibration value acquired by the second acquisition process ( Figure 4Therefore, the injection molding machine 100 can detect not only an abnormality of the first drive device 161 but also an abnormality of the second drive device 162.

[0109] In addition, the control device 140 performs the first acquisition process once and the second acquisition process once for a predetermined number of times. In other words, the control device 140 performs the first acquisition process and the second acquisition process alternately for a predetermined number of times. Therefore, the control device 140 can perform the second acquisition process in a state where the influence of the parameter change of the first drive device 161 caused by the first acquisition process is suppressed. In addition, the first acquisition process can be performed in a state where the influence of the parameter change of the second drive device 162 caused by the second acquisition process is suppressed.

[0110] The parameters of the first drive device 161 and the parameters of 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, the screw 123 is driven when the control device 140 performs the first acquisition process, so the temperature of the first drive device 161 (for example, the ball screw 39) rises. However, in the case where the control device 140 performs the second acquisition process after the first acquisition process, since the first acquisition process is completed, the temperature of the first drive device 161 decreases in the second acquisition process. Therefore, the control device 140 can perform the first acquisition process again in a state where the temperature of the first drive device 161 is reduced (that is, a state where the influence of the parameter change of the first drive device 161 is suppressed). Therefore, the control device 140 can obtain a high-precision vibration value through the first acquisition process.

[0111] Similarly, the control device 140 drives the movable plate 114 (see Figure 1 ), so the temperature of the second drive device 162 (for example, the ball screw 119) rises. However, in the case where the control device 140 executes the first acquisition process after the second acquisition process, since the second acquisition process is completed, the temperature of the second drive device 162 decreases during the first acquisition process. Therefore, the control device 140 can execute the second acquisition process again in a state where the temperature of the second drive device 162 is reduced (that is, a state where the influence of the parameter change of the second drive device 162 is suppressed). Therefore, the control device 140 can obtain a high-precision vibration value through the second acquisition process.

[0112] In addition, a bearing 51 (see FIG. 1 ) having a ball screw 39 that rotates to move toward the first drive device 161 at predetermined intervals is used. Figure 2) and the second drive device 162. In the case of adopting such a structure, the parameters of the first drive device 161 and the parameters of the second drive device 162 are set to the lubricating oil film thickness of the bearing 51 of the first drive device 161 and the lubricating oil film thickness of the bearing of the second drive device 162, respectively.

[0113] In this case, since the screw 123 is driven when the control device 140 performs the first acquisition process, the lubricating oil film thickness of the first drive device 161 decreases. However, in the case where the control device 140 performs the second acquisition process after the first acquisition process, since the first acquisition process is completed, the supply device supplies the lubricating oil film thickness of the first drive device 161 in the second acquisition process, thereby increasing the lubricating oil film thickness of the first drive device 161. Therefore, the control device 140 can perform the first acquisition process again in a state where the lubricating oil film thickness of the first drive device 161 increases (that is, a state where the influence of the parameter change of the first drive device 161 is suppressed). Therefore, the control device 140 can obtain a high-precision vibration value through the first acquisition process.

[0114] Similarly, when the control device 140 executes the second acquisition process, the movable plate 114 (see Figure 1 ), so the lubricating oil film thickness of the second drive device 162 is reduced. However, in the case where the control device 140 executes the first acquisition process after the second acquisition process, since the second acquisition process is completed, the lubricating oil film thickness of the second drive device 162 is supplied by the supply device in the first acquisition process, thereby increasing the lubricating oil film thickness of the second drive device 162. Therefore, the control device 140 can execute the second acquisition process again in a state where the lubricating oil film thickness of the second drive device 162 increases (that is, a state where the influence of the parameter change of the second drive device 162 is suppressed). Therefore, the control device 140 can obtain a high-precision vibration value through the second acquisition process.

[0115] In addition, 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 both vibration values. Assume that a configuration is considered in which the execution period of the first acquisition process overlaps the execution period of the second acquisition process. However, during this overlapping period (hereinafter also referred to as the "overlapping period"), since the vibration generated during the execution of the first acquisition process is transmitted to the second vibration sensor 82, the vibration value detected by the second vibration sensor 82 contains noise. At the same time, during the overlapping period, since the vibration generated during the execution of the second acquisition process is transmitted to the first vibration sensor 81, the vibration value detected by the first vibration sensor 81 contains noise. Therefore, the control device 140 acquires low-precision vibration values ​​from the first vibration sensor 81 and the second vibration sensor 82.

[0116] In contrast, in this embodiment, if Figure 8 As shown, the control device 140 executes the first acquisition process and the second acquisition process so that the execution period of the first acquisition process does not overlap with the execution period of the second acquisition process. Therefore, the accuracy of the vibration value acquired by the control device 140 can be ensured.

[0117] <Third embodiment>

[0118] The acquisition process of step 6A in the second embodiment (see Figure 8 ) has been described in detail with reference to an injection molding machine 100 in which the first acquisition process and the second acquisition process are alternately executed a predetermined number of times. The acquisition process of the third embodiment is a process in which the first acquisition process is executed alone a predetermined number of times and the second acquisition process is executed alone a predetermined number of times.

[0119] The main processing of the injection molding machine 100 of the third embodiment is as follows: Figure 4 The acquisition process of step S6 is replaced by the acquisition process of step S6B. Fig. 9 1 is a flowchart showing the flow of the acquisition process of step S6B. Fig. 9 , but also appropriate reference Figure 8 .

[0120] 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 executions of the first acquisition process has reached a prescribed number of times. In step S134, if the number of executions of the first acquisition process has not reached the prescribed 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 executions of the first acquisition process reaches the prescribed number of times. And, if the number of executions of the first acquisition process has reached the prescribed number of times (Yes in step S134), the process proceeds to step S124.

[0121] In step S124, the control device 140 performs the second acquisition process. Next, in step S138, the control device 140 determines whether the execution number of the second acquisition process has reached a prescribed number of times. In step S138, if the execution number of the second acquisition process has not reached the prescribed number of times (No in step S138), the process returns to step S124. The control device 140 repeats the second acquisition process until the execution number of the second acquisition process reaches the prescribed number of times. And, if the execution number of the second acquisition process has reached the prescribed number of times (Yes in step S138), the acquisition process of step S6B ends.

[0122] According to such a configuration, the control device 140 performs the first acquisition process for a predetermined number of times in combination, and also performs the second acquisition process for a predetermined number of times. Therefore, the control device 140 can smoothly perform the first acquisition process and the second acquisition process. It should be noted that the predetermined number of times in step S134 can be set to the same value as the predetermined number of times in step S138, or can be set to a different value.

[0123] <Fourth embodiment>

[0124] The display 132 of the injection molding machine 100 of the fourth embodiment is displayed during the flushing process (see Figure 4 ) performs acquisition processing (first acquisition processing) and processing for detecting abnormality of the first drive device 161 (see Figure 4 In the case of abnormality detection processing in step S8), the end timing of the period is displayed.

[0125] Fig.10 FIG. 1 is a diagram showing a display example of the display 132 according to the fourth embodiment. Fig.10 In the example of , the display 132 displays the timing after A (A is a positive real number) minutes from the current time as the timing when the flushing process ends (end timing). Fig.10 In the example of , the display 132 displays a text image of "the flushing process and the abnormality detection process are completed after A minutes".

[0126] The injection molding machine 100 according to the fourth embodiment can allow the user to recognize the end timing of the flushing process period, thereby improving the convenience of the user.

[0127] <Fifth embodiment>

[0128] Hereinafter, the process of detecting an abnormality of the first drive device 161 based on the vibration value detected by the first vibration sensor 81 is also referred to as "first abnormality detection process", and the process of detecting an abnormality of the second drive device 162 based on the vibration value detected by the second vibration sensor 82 is also referred to as "second abnormality detection process".

[0129] Fig.11 This is a diagram showing an example of a time series of processing of the injection molding machine 100 according to the fifth embodiment. Fig.11 and the following Fig.12 The horizontal axis represents the time axis. At timing t1, the flushing condition is satisfied. When the flushing condition is satisfied (timing t1), the control device 140 does not perform the second acquisition process during the flushing process but performs the first acquisition process. Then, the control device 140 performs the first abnormality detection process based on the vibration value acquired by the first acquisition process.

[0130] At timing t2 after timing t1, the flushing condition is satisfied again. When the flushing condition is satisfied (timing t2), the control device 140 does not perform the first acquisition process during the flushing process but performs the second acquisition process. Then, the control device 140 performs the second abnormality detection process based on the vibration value acquired by the second acquisition process.

[0131] When the injection molding machine 100 performs both the first acquisition process and the second acquisition process during the entire flushing process, the flushing process period may sometimes become too long. Therefore, the injection molding machine 100 of this embodiment does not perform the second acquisition process during any flushing process period and performs the first acquisition process. Then, the injection molding machine 100 does not perform the first acquisition process during the next flushing process period and performs the second acquisition process. Therefore, it is possible to suppress the flushing process period from becoming too long while performing the first abnormality detection process and the second abnormality detection process.

[0132] <Sixth embodiment>

[0133] Fig.12 1 is a diagram showing an example of a time series of processing of the injection molding machine 100 according to the sixth embodiment. Fig.12 As shown, the injection molding machine 100 of the sixth embodiment uses a prescribed period T. The prescribed period T includes, for example, at least one of the concept of a prescribed time and the concept of a prescribed number of injections. That is, the passage of the prescribed period T includes at least one of "the concept of a prescribed time" and "the concept of the injection molding machine 100 performing a molding process for a prescribed number of injections". The prescribed time is, for example, one month, and the prescribed number of injections is, for example, the number of molded products produced within the month.

[0134] At timing t1 , the flushing condition is satisfied. When the flushing condition is satisfied (timing t1 ), the control device 140 executes the flushing process, the acquisition process, and the abnormality detection process based on the vibration value acquired by the acquisition process during the flushing process.

[0135] At timing t2 after timing t1, the flushing condition is satisfied again. Timing t2 is the timing from timing t1 until a predetermined period T has passed. When the flushing condition is satisfied (timing t2), the control device 140 performs the flushing process without performing the acquisition process (abnormality detection process) during the flushing process.

[0136] At timing t3 after timing t2, the flushing condition is satisfied again. Timing t3 is a timing after a predetermined period T has passed since timing t1. When the flushing condition is satisfied (timing t3), the control device 140 performs flushing processing and acquisition processing during the flushing processing, and performs abnormality detection processing based on the vibration value acquired by the acquisition processing.

[0137] If the injection molding machine 100 performs the acquisition process and the abnormality detection process every time the flushing condition is met, the efficiency of the molding process may be reduced. Therefore, during the flushing process, the injection molding machine 100 of this embodiment performs the acquisition process ( Fig.12 From the timing t1 of the embodiment to the predetermined period T, when the flushing condition is satisfied (timing t2), the flushing process is executed without executing the acquisition process. In addition, during the flushing process, after a predetermined period has passed from the time when the acquisition process is executed (timing t1), when the flushing condition is satisfied (timing t3), the flushing process, the acquisition process, and the first abnormality detection process are executed during the flushing process.

[0138] Thus, during the flushing process, the injection molding machine 100 executes the acquisition process only when a predetermined condition is satisfied after a predetermined period T has passed since the acquisition process was executed. Therefore, the injection molding machine 100 of this embodiment can suppress a decrease in the efficiency of the molding process.

[0139] <Other embodiments>

[0140] (1) In the above-mentioned embodiment, it is described that the physical quantity used in the abnormality detection process of the drive device (the first drive device 161 and the second drive device 162) is composed of vibration values. However, the physical quantity used in the abnormality detection process of the drive device may also be other values. The physical quantity may also be set to the temperature of the drive device, the volume emitted from the drive device, the current or voltage supplied to the motor included in the drive device, the torque of the motor, etc.

[0141] (2) It explains Figure 4The abnormality detection process of step S8 is executed before the second flushing process. However, the control device 140 may also execute the abnormality detection process during other periods. 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 is completed.

[0142] (3) In the above embodiment, the second drive device 162 is described as a drive device for driving the movable platen 114. However, the second drive device 162 may be a device for driving a predetermined component. The predetermined component includes, for example, at least one of the movable platen 114, the protrusion mechanism, and the mechanism for measuring the resin.

[0143] [Note]

[0144] Those skilled in the art should understand that the above-mentioned multiple exemplary embodiments are specific examples of the following aspects.

[0145] (Item 1) The main molding machine disclosed in the present invention includes a cylinder, a screw, a first drive device, a first sensor, and a control device. The cylinder contains resin. The screw is arranged in 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 drives the screw by controlling the first drive device to perform a flushing process for removing residual resin remaining in the cylinder. The control device performs a first acquisition process for acquiring the first physical quantity detected by the first sensor during the flushing process. In addition, the control device detects an abnormality of the first drive device based on the first physical quantity acquired by the first acquisition process.

[0146] (Item 2) In the injection molding machine described in Item 1, the flushing process includes a first flushing process for removing residual resin without introducing new resin into the cylinder, and a second flushing process for removing residual resin by introducing new resin into the cylinder. The control device executes the first acquisition process and the second flushing process after executing the first flushing process.

[0147] (Item 3) In the injection molding machine described in Item 2, the injection molding machine produces a molded product using new resin after executing the second flushing process. The control device executes the first acquisition process after executing the first flushing process and before executing the second flushing process.

[0148] (Item 4) In the injection molding machine described in Item 2 or Item 3, the first flushing process is a process of driving the screw to maximize the amount of movement of the screw when the amount of movement in the direction of travel of the screw is not the maximum amount. In addition, the first flushing process is a process in which no processing is performed when the amount of movement is the maximum amount.

[0149] (Item 5) In the injection molding machine described in any one of Items 1 to 4, the injection molding machine further includes a prescribed component, a second drive device, and a second sensor. The prescribed component is a component different from the screw. The second drive device drives the prescribed component. The second sensor detects a second physical quantity of the second drive device. The control device performs a second acquisition process for acquiring the second physical quantity detected by the second sensor while controlling the second drive device to drive the prescribed component. The control device detects an abnormality of the second drive device based on the second physical quantity acquired by the second acquisition process.

[0150] (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 predetermined number of times.

[0151] (Item 7) In the injection molding machine described in Item 5, the control device executes the first acquisition process a predetermined number of times and executes the second acquisition process a predetermined number of times.

[0152] (Item 8) In the injection molding machine described in Item 5, when the specified condition is satisfied, the control device does not execute the second acquisition process during the flushing process but executes the first acquisition process. In addition, when the specified condition is satisfied again, the control device does not execute the first acquisition process during the flushing process but executes the second acquisition process.

[0153] (Item 9) In the injection molding machine described in any one of Items 1 to 8, the control device performs the flushing process without performing the first acquisition process until a prescribed period has passed since the first acquisition process was performed during the flushing process, when a prescribed condition is satisfied. Furthermore, the control device performs the first acquisition process during the flushing process, when a prescribed condition is satisfied, after a prescribed period has passed since the first acquisition process was performed during the flushing process.

[0154] (Item 10) In the injection molding machine described in any one of Items 1 to 9, the injection molding machine further includes a display. When the control device executes the process of detecting abnormalities of the first acquisition process and the first drive device during the flushing process, the end timing of the period is displayed on the display.

[0155] (Item 11) The present disclosure discloses an abnormality detection method for an injection molding machine. The injection molding machine includes a cylinder, a screw, a first drive device, and a first sensor. The cylinder contains resin. The screw is arranged 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 the step of performing a flushing process for removing residual resin remaining in the cylinder by controlling the first drive device to drive the screw. In addition, the abnormality detection method includes the step of performing a first acquisition process for acquiring a first physical quantity detected by the first sensor during the flushing process. The abnormality detection method includes the step of detecting an abnormality of the first drive device based on the first physical quantity acquired by the first acquisition process.

[0156] It should be noted that the above-mentioned embodiments and modified examples include combinations not described in the specification, and it is intended at the beginning of the application that the configurations described in the embodiments be appropriately combined within a range that does not cause problems or contradictions.

[0157] The embodiments of the present invention have been described above, but the embodiments disclosed this time should be considered to be illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the claims, and it is intended to include all changes within the meaning and scope equivalent to the claims.

Claims

1. An injection molding machine, characterized in that: include: a cylinder housing the resin; A screw rod is disposed in the cylinder body; a first driving device, which drives the screw; a first sensor for detecting a first physical quantity of the first driving device; as well as a control device that controls the first drive device to drive the screw to perform a flushing process for removing residual resin remaining in the cylinder body, The control device performs a first acquisition process of acquiring the first physical quantity detected by the first sensor during the flushing process. The control device detects abnormality of the first drive device based on the first physical quantity acquired by the first acquisition process.

2. The injection molding machine according to claim 1, characterized in that The flushing process comprises: a first flushing process for removing the residual resin without introducing new resin into the cylinder; and A second flushing process is used to remove the residual resin by introducing new resin into the cylinder. The control device executes the first acquisition process and the second flushing process after executing the first flushing process.

3. The injection molding machine according to claim 2, characterized in that The injection molding machine generates a molded product using the new resin after performing the second flushing process. The control device executes the first acquisition process after executing the first flushing process and before executing the second flushing process.

4. The injection molding machine according to claim 2 or 3, characterized in that: 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. Furthermore, when the movement amount is the maximum amount, no processing is performed.

5. The injection molding machine according to any one of claims 1 to 4, characterized in that The injection molding machine also includes: A specified part different from the screw; a second driving device that drives the prescribed member; and a second sensor for detecting a second physical quantity of the second driving device, The control device executes a second acquisition process of acquiring the second physical quantity detected by the second sensor while controlling the second drive device to drive the predetermined member. The control device detects abnormality of 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, characterized in that The control device alternately executes the first acquisition process and the second acquisition process a predetermined number of times.

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

8. The injection molding machine according to claim 5, characterized in that When a predetermined condition is satisfied, the control device does not execute the second acquisition process but executes the first acquisition process during the flushing process. When the predetermined condition is satisfied again, the control device performs the second acquisition process instead of the first acquisition process during the flushing process.

9. The injection molding machine according to any one of claims 1 to 8, characterized in that When a predetermined period of time has passed since the control device executed the first acquisition process during the flushing process, and a predetermined condition is satisfied, the control device executes the flushing process without executing the first acquisition process. When the predetermined condition is satisfied after the predetermined period has elapsed since the control device executed the first acquisition process during the flushing process, the control device executes the first acquisition process during the flushing process.

10. The injection molding machine according to any one of claims 1 to 9, characterized in that The injection molding machine further comprises a display. When the control device executes the first acquisition process and the process of detecting an abnormality of the first drive device during the flushing process, the end timing of the period is displayed on the display.

11. A method for detecting abnormality of an injection molding machine, characterized in that: The injection molding machine comprises: a cylinder housing the resin; A screw rod is disposed in the cylinder body; a first driving device that drives the screw; and a first sensor for detecting a first physical quantity of the first driving device, The anomaly detection method includes the following processing: The first drive device is controlled to drive the screw, thereby performing a flushing process for removing residual resin remaining in the cylinder; performing a first acquisition process of acquiring the first physical quantity detected by the first sensor in the flushing process; and An abnormality of the first drive device is detected based on the first physical quantity acquired by the first acquisition process.

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