CN-121988716-A - Monitoring device and monitoring method

Abstract

The invention provides a monitoring device and a monitoring method capable of controlling fluctuation of molten metal or entrainment of gas into the molten metal by monitoring shaking of the molten metal in a plunger sleeve during low-speed injection in an initial injection period of an injection molding machine and controlling an injection speed according to a monitoring result. A monitoring device includes an acquisition unit that acquires acceleration information of a plunger during an injection operation, a determination unit that determines shaking of molten metal in a plunger sleeve from start of injection of the molten metal in the plunger sleeve by the plunger to acceleration in a travel direction of the plunger within a predetermined period of time, and an output unit that outputs a determination result of the shaking of the molten metal.

Inventors

• KOYAMA TOMOHIRO

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251030

Priority Date

20241101

Claims (5)

1. 1. A monitoring device, characterized by comprising: An acquisition unit that acquires acceleration information of a plunger during an injection operation; A determination unit that determines shaking of the molten metal in the plunger sleeve from information about acceleration in a traveling direction of the plunger in a predetermined period from start of injection of the molten metal in the plunger sleeve by the plunger, among the acceleration information, and And an output unit that outputs a determination result of the shake of the molten metal.
2. 2. The monitoring device of claim 1, wherein, When the fluctuation range of the acceleration in the traveling direction of the plunger exceeds a predetermined value, the determination unit determines that the shake of the molten metal in the plunger sleeve exceeds an allowable range.
3. 3. The monitoring device of claim 1, wherein, When it is determined that the shaking of the molten metal is out of the allowable range, the output unit outputs an instruction to reduce the injection speed of the molten metal by the plunger in the predetermined period from the start of the injection of the molten metal by the plunger.
4. 4. The monitoring device of claim 1, wherein, The determination unit further determines a degree of engagement of any one of the plunger sleeve and the plunger based on information on acceleration in a direction perpendicular to a traveling direction of the plunger among the acceleration information.
5. 5. A method of monitoring comprising the steps of: Acquiring acceleration information of a plunger in an injection action; Determining the wobble of the molten metal in the plunger sleeve from the start of the injection of the molten metal in the plunger sleeve by the plunger to the acceleration in the traveling direction of the plunger within a predetermined period of time from the acceleration information, and Outputting a result of the determination of the shaking of the molten metal.

Description

Monitoring device and monitoring method Technical Field The invention relates to a monitoring device and a monitoring method. Background In an injection molding machine, also called a die casting apparatus, it is required to prevent a temperature drop of molten metal by making an injection speed of molten metal by a plunger as fast as possible during a low-speed injection at an initial stage of injection. However, if the injection speed is too high, the molten metal in the plunger sleeve may shake, and the molten metal may fluctuate or be entrained into the gas in the molten metal. If the fluctuation of the molten metal or the entrainment of the gas into the molten metal occurs, the molten metal may be mixed with the gas and injected into the cavity of the mold, and in this case, a molded article including bubbles may be formed. A technique of a die casting apparatus is disclosed in patent document 1, for example. The die casting device disclosed in patent document 1 is provided with an acceleration sensor capable of detecting acceleration in the 3-axis direction of at least one of the plunger sleeve, the plunger head, and the plunger rod. The vibration (vibration) caused by the engagement (wear) of the plunger sleeve or the plunger head is detected based on the acceleration in the vertical direction detected by the acceleration sensor. Patent document 1 Japanese patent application laid-open No. 2020-138209 Disclosure of Invention Next, in the injection molding machine, it is required to prevent the temperature of the molten metal from decreasing by making the injection speed of the molten metal by the plunger as fast as possible during the low-speed injection at the initial stage of injection. However, if the injection speed is too high, the molten metal in the plunger sleeve is shaken to cause fluctuation of the molten metal or entrainment of gas into the molten metal. The present invention has been made in view of the above circumstances, and an object thereof is to provide a monitoring device and a monitoring method capable of controlling fluctuation of molten metal or entrainment of gas into molten metal by monitoring the shake of molten metal in a plunger sleeve during low-speed injection in an initial stage of injection of an injection molding machine and controlling an injection speed based on a monitoring result thereof. A monitoring device according to the present invention includes an acquisition unit that acquires acceleration information of a plunger during an injection operation, a determination unit that determines shaking of the molten metal in a plunger sleeve from information on acceleration of the plunger in a predetermined period from start of injection of the molten metal in the plunger sleeve by the plunger to acceleration of the plunger in a traveling direction, and an output unit that outputs a determination result of the shaking of the molten metal. The monitoring device according to the present invention can monitor the shake of the molten metal in the plunger sleeve during the low-speed injection at the initial stage of the injection molding machine based on the information on the acceleration in the traveling direction of the plunger. The injection molding machine can suppress fluctuation of the molten metal or entrainment of gas into the molten metal by controlling the injection speed based on the monitoring result thereof, for example. Thus, the injection molding machine can prevent the molten metal from being mixed with the gas and injected into the cavity of the mold, and thus can form a high-quality molded product P. In the monitoring method according to the present invention, acceleration information of a plunger during an injection operation is acquired, shaking of the molten metal in a plunger sleeve is determined based on information on acceleration in a traveling direction of the plunger from a start of injection of the molten metal in the plunger sleeve by the plunger to a predetermined period in the acceleration information, and a determination result of the shaking of the molten metal is output. The monitoring method according to the present invention can monitor the shake of the molten metal in the plunger sleeve during the low-speed injection at the initial stage of the injection molding machine based on the information on the acceleration in the traveling direction of the plunger. The injection molding machine can suppress fluctuation of the molten metal or entrainment of gas into the molten metal by controlling the injection speed based on the monitoring result thereof, for example. Thus, the injection molding machine can prevent the molten metal from being mixed with the gas and injected into the cavity of the mold, and thus can form a high-quality molded product P. Effects of the invention The present invention can provide a monitoring device and a monitoring method capable of controlling fluctuation of molten metal or entrainment of gas into molten metal by mo