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US-12617138-B2 - Injection molding machine with controller for diagnosing injection molding machine

US12617138B2US 12617138 B2US12617138 B2US 12617138B2US-12617138-B2

Abstract

A vibration sensor detects first data of a first component group and second data of a second component group. An injection molding machine performs diagnosis processing for diagnosing the first component group based on the first data in an injection mode and performs diagnosis processing for diagnosing the second component group based on the second data in a plasticization mode.

Inventors

  • Kotone ANDO

Assignees

  • THE JAPAN STEEL WORKS, LTD.

Dates

Publication Date
20260505
Application Date
20231230
Priority Date
20230125

Claims (15)

  1. 1 . An injection molding machine comprising: a first component; a second component different from the first component; a controller configured to drive the first component and the second component; and a first sensor configured to detect first data of the first component and second data of the second component, wherein the controller is configured to operate the injection molding machine using one of a plurality of modes including a first mode and a second mode, the first mode is a mode in which the first component is driven but the second component is not driven, the second mode is a mode in which the second component is driven but the first component is not driven, and the controller being further configured to: perform first diagnosis processing including at least one of abnormality detection and lifetime prediction of the first component based on the first data detected in the first mode, and perform second diagnosis processing including at least one of abnormality detection and lifetime prediction of the second component based on the second data detected in the second mode.
  2. 2 . The injection molding machine according to claim 1 , comprising: a first component group including the first component and a third component; and a second component group including the second component and a fourth component, wherein the first mode is a mode in which the third component is used but the fourth component is not used, the second mode is a mode in which the fourth component is used but the third component is not used, the first diagnosis processing includes at least one of abnormality detection and lifetime prediction of the first component group, and the second diagnosis processing includes at least one of abnormality detection and lifetime prediction of the second component group.
  3. 3 . The injection molding machine according to claim 2 , comprising a screw that rotates and is movable in a prescribed direction, wherein the first mode is an injection mode in which the screw is moved in the prescribed direction, the second mode is a plasticization mode in which the screw is rotated, the first component group includes a ball screw, a ball screw nut attached to the ball screw, a first bearing that rotatably supports the ball screw, a first motor, and a first timing belt that transmits motive power from the first motor to the ball screw, with rotation of the ball screw, the ball screw nut moves the screw in the prescribed direction, and the second component group includes a second bearing that rotatably supports the screw, a second motor, and a second timing belt that transmits motive power from the second motor to the screw.
  4. 4 . The injection molding machine according to claim 3 , wherein the first component group further includes a linear guide that guides movement of the screw in the prescribed direction.
  5. 5 . The injection molding machine according to claim 3 , wherein the second component group further includes a reduction gear of the second motor.
  6. 6 . The injection molding machine according to claim 3 , wherein the first sensor is attached to the ball screw nut.
  7. 7 . The injection molding machine according to claim 1 , wherein the first sensor detects vibration of the first component and vibration of the second component.
  8. 8 . The injection molding machine according to claim 1 , wherein the plurality of modes include a deactivation mode in which all components of the injection molding machine are deactivated, and the controller performs the first diagnosis processing based on the first data detected in the first mode and deactivation data detected by the first sensor in the deactivation mode, and performs the second diagnosis processing based on the second data detected in the second mode and the deactivation data.
  9. 9 . The injection molding machine according to claim 1 , wherein the plurality of modes include a maintenance mode and a molding mode, the injection molding machine producing a molded article in the molding mode, and the controller performs the first diagnosis processing and the second diagnosis processing during the maintenance mode.
  10. 10 . The injection molding machine according to claim 1 , wherein the injection molding machine manufactures a molded article from a material injected into the injection molding machine, wherein the controller performs the first diagnosis processing and the second diagnosis processing with the material not having been introduced in the injection molding machine.
  11. 11 . The injection molding machine according to claim 1 , wherein the injection molding machine manufactures a molded article from a material injected into the injection molding machine, wherein the controller performs the first diagnosis processing and the second diagnosis processing with the material in the injection molding machine.
  12. 12 . The injection molding machine according to claim 1 , comprising at least one of a second sensor and a third sensor, wherein the second sensor is a sensor configured to detect data of the first component but not to detect data of the second component, and the third sensor is a sensor configured to detect data of the second component but not to detect data of the first component.
  13. 13 . The injection molding machine according to claim 1 , wherein the first data and the second data are both waveform data, and the controller converts the first data and the second data into data in a frequency domain and performs the first diagnosis processing and the second diagnosis processing based on the data in the frequency domain.
  14. 14 . The injection molding machine according to claim 1 , wherein the controller performs the first diagnosis processing by inputting the first data into a first model that has been machine-trained, and performs the second diagnosis processing by inputting the second data into a second model that has been machine-trained.
  15. 15 . A method of diagnosing an injection molding machine, the injection molding machine including a first component, a second component different from the first component, and a first sensor that is configured to detect first data of the first component and second data of the second component, a mode of the injection molding machine including a first mode in which the first component is driven but the second component is not driven and a second mode in which the second component is driven but the first component is not driven, the method comprising: performing first diagnosis processing including at least one of abnormality detection and lifetime prediction of the first component based on the first data detected in the first mode; and performing second diagnosis processing including at least one of abnormality detection and lifetime prediction of the second component based on the second data detected in the second mode.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This nonprovisional application is based on Japanese Patent Application No. 2023-009165 filed with the Japan Patent Office on Jan. 25, 2023, the entire contents of which are hereby incorporated by reference. BACKGROUND OF THE INVENTION Field of the Invention The present disclosure relates to an injection molding machine and a method of diagnosing an injection molding machine. Description of the Background Art For example, Japanese Patent Laying-Open No. 2021-74917 discloses an injection molding machine including a ball screw. This injection molding machine detects an abnormality of the ball screw by frequency analysis of vibration strength of the ball screw. SUMMARY OF THE INVENTION An injection molding machine includes a plurality of components including a ball screw. The plurality of components include a first component and a second component. In the injection molding machine, the first component and the second component other than the ball screw are preferably also diagnosed. In order to diagnose the first component and the second component, a configuration including a sensor that diagnoses the first component and a sensor that diagnoses the second component may be provided. In such a configuration, however, the number of sensors may disadvantageously increase. This invention was made to solve such a problem, and an object thereof is to diagnose a first component and a second component while the number of sensors is suppressed. In an injection molding machine and a method of diagnosing an injection molding machine according to the present disclosure, a first sensor detects first data of a first component and second data of a second component. In the injection molding machine and the method of diagnosing the injection molding machine, diagnosis processing for diagnosing the first component is performed based on the first data detected in a first mode and diagnosis processing for diagnosing the second component is performed based on the second data detected in a second mode. The foregoing and other objects, features, aspects and advantages of this invention will become more apparent from the following detailed description of this invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a construction of an injection molding machine. FIG. 2 is a diagram showing a construction of an actuation apparatus. FIG. 3 is a diagram showing an exemplary component to be diagnosed in each mode. FIG. 4 is a functional block diagram of a controller. FIG. 5 is a flowchart showing a flow of control in the injection molding machine. FIG. 6 is a flowchart showing a flow of diagnosis processing. FIG. 7 is a flowchart showing a flow of diagnosis processing in a second embodiment. FIG. 8 is a diagram showing exemplary correspondence between each sensor and a diagnosed component in a third embodiment. FIG. 9 is a functional block diagram of a controller in another embodiment. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. The same or corresponding elements in the drawings have the same reference characters allotted and description thereof will not be repeated. First Embodiment [Construction of Injection Molding Machine] FIG. 1 is a diagram for illustrating a construction of an injection molding machine 100. For the sake of convenience of description, a floor surface where injection molding machine 100 is arranged in FIG. 1 is defined as an XY plane and a direction perpendicular to the floor surface is defined as a Z-axis direction. A positive direction along a Z axis may be referred to as an upper surface side or above and a negative direction thereof may be referred to as a lower surface side or below. Though injection molding machine 100 is shown as a lateral injection molding machine, it is not limited to the lateral type but may be a vertical injection molding machine. Injection molding machine 100 includes a mold clamping apparatus 110 that clamps a mold, an injection apparatus 120 that melts and injects an injection material, a control panel 130, and a controller 140. In FIG. 1, mold clamping apparatus 110 is arranged on a side of the negative direction along an X axis with respect to injection apparatus 120. Mold clamping apparatus 110 includes a bed 111, a fixed plate 112, a mold clamping housing 113, a moving plate 114, a tie bar 115, a mold clamping mechanism 116, molds 117 and 118, and a ball screw 119. Bed 111 is arranged on the floor surface, and such apparatuses as fixed plate 112, mold clamping housing 113, and moving plate 114 are mounted on an upper surface thereof. Fixed plate 112 is fixed on bed 111 at an end on a side closer to injection apparatus 120 (that is, the positive direction along the X axis). Mold clamping housing 113 is arranged on bed 111 at an end in the negative direction along the X axis