JP-7856689-B2 - Plasticization state diagnostic device for injection molding machines
Inventors
- 依田 穂積
- 櫻田 勇一
- 福田 繕巨
Assignees
- 日精樹脂工業株式会社
Dates
- Publication Date
- 20260511
- Application Date
- 20240311
Claims (4)
- A plasticization state diagnostic device for an injection molding machine, which diagnoses the plasticization state of a molding material supplied to the interior of a heating cylinder from a material supply unit located at the rear of the heating cylinder, and which is plasticized by the rotation of a screw, is characterized by comprising: a temperature sensor that detects the heating temperature of the heating cylinder by having a sensor mounting portion attached to the outer surface of the heating cylinder; an AE sensor that detects AE waves integrally provided with the temperature sensor by inserting the tip of a waveguide rod into an insertion hole formed on the side surface of the sensor mounting portion; and a diagnostic processing unit that diagnoses the plasticization state of the molding material based on the detection result of the AE sensor.
- The plasticization state diagnostic device for an injection molding machine according to claim 1, characterized in that the AE sensor comprises a first AE sensor and a second AE sensor, the first AE sensor being positioned at a first position on the rear side of the heating cylinder, and the second AE sensor being positioned at a second position on the heating cylinder, forward of the first position.
- The diagnostic processing unit comprises a data processing unit having a position calculation processing unit that determines position data related to the generation location of an AE wave based on the arrival time of the AE wave obtained from each AE sensor; an attack count calculation processing unit that determines the number of times the AE wave signal related to the AE wave generated for a predetermined sampling period and for each predetermined position data exceeds a preset threshold as attack count data; and an event count calculation processing unit that determines the quantity of the AE wave component that exceeds a preset threshold as event count data. This is the plasticization state diagnostic device for an injection molding machine according to claim 2.
- The plasticization state diagnostic device for an injection molding machine according to claim 3, characterized in that the diagnostic processing unit includes a graphic display unit that displays the occurrence patterns of the attack count data and the event count data in relation to the position data in a graphical format.
Description
This invention relates to a plasticization state diagnostic device for an injection molding machine, suitable for use when plasticizing a molding material supplied inside a heating cylinder by the rotation of a screw. Generally, the injection mechanism of an injection molding machine has the function of plasticizing the molding material (pellets, etc.) supplied to the inside of a heating cylinder from a material supply unit located at the rear of the heating cylinder, which is heated by a heating unit, by the rotation of a screw. Therefore, accurately understanding the plasticization state of the molding material inside the heating cylinder is important from the standpoint of avoiding molding defects and ensuring high molding quality, and various monitoring devices for understanding the plasticization state have been proposed. Conventionally, a material monitoring device for injection molding machines, as described in Patent Document 1 proposed by the present applicant, is already known as a monitoring device of this type. The material monitoring device described in Patent Document 1 aims to promptly identify the causes of poor melting conditions and implement countermeasures, while also preventing plasticization defects and achieving ideal plasticization processing. Specifically, it comprises an acoustic emission wave sensing sensor that detects acoustic emission waves generated when the molding material supplied to the interior of a heating cylinder from a material supply unit located at the rear of the heating cylinder (which is heated by multiple heating units, including a rear heating unit that heats the rear of the heating cylinder) is plasticized by the rotation of a screw, causing the molding material to deform or shear inside the heating cylinder, and converts these waves into electrical signals; an acoustic emission detection unit that detects quantitative acoustic emission data related to the deformation or shearing of the molding material from the electrical signals; and a material response processing function unit that performs predetermined material response processing based on the use of this acoustic emission data. Japanese Patent Publication No. 2012-111091 A cross-sectional view showing the mounting structure of an AE sensor and a temperature sensor included in a plasticization state diagnostic device according to a preferred embodiment of the present invention.This is an external perspective view showing the AE sensor, which is part of the plasticization state diagnostic device, attached to the heating cylinder.A functional block diagram showing the overall configuration (system) of the plasticization state diagnostic device.A perspective view showing the AE sensor, which is part of the plasticization state diagnostic device, attached to the heating cylinder.A perspective view showing the internal structure of the mounting mechanism for the AE sensor in the plasticization state diagnostic device, obtained by cutting the sensor.Diagram illustrating the mounting method for the AE sensor and temperature sensor included in the plasticization state diagnostic device.A cross-sectional diagram showing an example of a modified mounting structure for the AE sensor and temperature sensor included in the plasticization state diagnostic device.A flowchart showing the processing procedure of the plasticization state diagnostic device using the same plasticization state diagnostic device.A signal waveform diagram illustrating a method for determining the generation location using the AE wave signal obtained from the plasticization state diagnostic device.A signal waveform diagram illustrating a method for determining the number of attacks and event counts using AE wave signals obtained from the plasticization state diagnostic device.A diagram of the display screen of the graphic display unit equipped with the plasticization state diagnostic device.A display screen diagram showing an example of an occurrence pattern displayed by the graphic display unit.A display screen diagram showing another example of the occurrence pattern displayed by the same graphic display unit.A display screen diagram showing another example of the occurrence pattern displayed by the same graphic display unit.A display screen diagram showing another example of the occurrence pattern displayed by the same graphic display unit. Next, preferred embodiments of the present invention will be described in detail with reference to the drawings. First, the overall schematic configuration of the injection molding machine M equipped with the plasticization state diagnostic device 1 according to this embodiment will be described with reference to Figure 2. The injection molding machine M comprises an injection device Mi shown in Figure 2 and a mold clamping device (not shown). The injection device Mi is mounted on the upper surface of a movable table 21, which is movable in the forward/backward direction Fs by a nozzle touch drive unit. 22