CN-121988720-A - Monitoring device and monitoring method

Abstract

The monitoring device is provided with an acquisition unit that acquires acceleration information of a plunger during injection, a determination unit that determines that there is an abnormality in a drive mechanism that drives the plunger when the fluctuation range of the acceleration of the plunger in the advancing direction exceeds a predetermined value and when the fluctuation frequency of the acceleration of the plunger in the advancing direction contains a component of a predetermined frequency, and an output unit that outputs the determination result of the determination unit.

Inventors

• KOYAMA TOMOHIRO

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251027

Priority Date

20241101

Claims (5)

1. 1. A monitoring device, characterized by comprising: An acquisition unit that acquires acceleration information of a plunger during injection; A determination unit that determines that there is an abnormality in a drive mechanism that drives the plunger when a fluctuation range of acceleration of the plunger in a pushing direction exceeds a predetermined value and when a fluctuation frequency of acceleration of the plunger in the pushing direction includes a component of a predetermined frequency, and And an output unit that outputs a determination result of the determination unit.
2. 2. The monitoring device of claim 1, wherein, The determination unit determines that there is an abnormality in the drive mechanism that drives the plunger when the fluctuation range of the acceleration of the plunger in the advancing direction exceeds the predetermined value, and when the fluctuation frequency of the acceleration of the plunger in the advancing direction continuously includes the component of the predetermined frequency during the acceleration measurement.
3. 3. The monitoring device according to claim 2, wherein, The determination unit determines that there is an abnormality other than the driving mechanism that drives the plunger, even when the fluctuation range of the acceleration of the plunger in the advancing direction exceeds the predetermined value, if the component of the predetermined frequency is included in the fluctuation frequency of the acceleration of the plunger in the advancing direction only during a part of the acceleration measurement period, or if the component of the predetermined frequency is not included in the fluctuation frequency of the acceleration of the plunger in the advancing direction during the acceleration measurement period.
4. 4. The monitoring device of claim 1, wherein, The determination unit further determines whether or not at least one of the injection sleeve and the plunger is stuck based on information on acceleration of the plunger in a direction perpendicular to a pushing direction among the acceleration information.
5. 5. A method of monitoring comprising the steps of: Acquiring acceleration information of a plunger in the injection action; Determining that there is an abnormality in a drive mechanism that drives the plunger when a fluctuation range of acceleration of the plunger in a pushing direction exceeds a predetermined value and when a fluctuation frequency of acceleration of the plunger in the pushing direction contains a component of a predetermined frequency, and And outputting the result of the judgment.

Description

Monitoring device and monitoring method Technical Field The invention relates to a monitoring device and a monitoring method. Background In order to form a high-quality molded article, a die casting machine, which is also called a die casting apparatus, is required to detect and quickly repair various abnormalities affecting plunger injection molten metal. A technique for a die casting device is disclosed in, for example, japanese patent application laid-open No. 2020-138209. In the die casting device disclosed in japanese patent application laid-open No. 2020-138209, an acceleration sensor capable of detecting acceleration in the 3-axis direction is provided to at least one of the injection sleeve, the plunger head, and the plunger rod. Chatter vibration (vibration) caused by seizing (abrasion) of the injection sleeve or the plunger head is detected by the acceleration in the vertical direction detected by the acceleration sensor. Disclosure of Invention Anomalies that affect plunger shot melt include not only seizure, but also anomalies in the drive mechanism that drives the plunger. However, japanese patent application laid-open No. 2020-138209 has a problem that abnormality other than seizure, among abnormality affecting plunger injection molten steel, cannot be detected. The present invention has been made in view of the above circumstances, and provides a monitoring device and a monitoring method capable of specifying a site where an abnormality affecting plunger injection molten steel occurs. The monitoring device according to the present invention includes: An acquisition unit that acquires acceleration information of a plunger during injection; A determination unit that determines that there is an abnormality in a drive mechanism that drives the plunger when a fluctuation range of acceleration of the plunger in a pushing direction exceeds a predetermined value and when a fluctuation frequency of acceleration of the plunger in the pushing direction includes a component of a predetermined frequency, and And an output unit that outputs a determination result of the determination unit. The monitoring device according to the present invention can detect abnormality of a driving mechanism for driving a plunger with high accuracy. That is, the monitoring device according to the present invention can detect abnormalities other than seizure among abnormalities affecting the plunger injection molten metal. The die casting machine is capable of repairing abnormal parts as needed based on the monitoring result of the monitoring device according to the present invention, and thus a high-quality molded product can be formed. The monitoring method comprises the following steps: Acquiring acceleration information of a plunger in the injection action; Determining that there is an abnormality in a drive mechanism that drives the plunger when a fluctuation range of acceleration of the plunger in a pushing direction exceeds a predetermined value and when a fluctuation frequency of acceleration of the plunger in the pushing direction contains a component of a predetermined frequency, and And outputting the result of the judgment. The monitoring method according to the present invention can detect abnormality of a driving mechanism for driving a plunger with high accuracy. That is, the monitoring method according to the present invention can detect abnormalities other than seizure among abnormalities affecting the plunger injection molten metal. The die casting is capable of repairing abnormal parts as needed based on the monitoring result in the monitoring method according to the present invention, and thus a high-quality molded product can be formed. The present invention can provide a monitoring device and a monitoring method capable of specifying a site where an abnormality affecting plunger injection molten metal occurs. Drawings Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals denote like elements, and in which: fig. 1 is a schematic cross-sectional view showing a die casting machine to which the monitoring device according to the present invention is applied. Fig. 2 is a schematic cross-sectional view showing a die casting machine to which the monitoring device according to the present invention is applied. Fig. 3 is a block diagram showing a configuration example of a monitoring device according to the present invention. Fig. 4 is a waveform diagram showing acceleration of the plunger when there is an abnormality in the drive mechanism. Fig. 5 is a waveform diagram showing acceleration of the plunger in the case where there is no abnormality in the drive mechanism. Fig. 6 is an enlarged waveform diagram showing a part of acceleration of the plunger when there is an abnormality in the drive mechanism. Fig. 7 is an enlarged waveform diagram showing a