Injection molding machine and method of controlling the same

Patent metadata

Field	Value
Publication number	US-12508758-B2
Application number	US-202318225921-A
Country	US
Kind code	B2
Filing date	Jul 25, 2023
Priority date	Aug 3, 2022
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

Performance of an injection molding machine is improved. The injection molding machine includes: a central controller centrally controlling an injection molding operation; a first injection apparatus performing an injecting operation of material, based on a first injection start signal output from the central controller; a second injection apparatus performing an injecting operation of material, based on a second injection start signal output from the central controller; and a mold clamping apparatus performing a mold clamping apparatus. The injection molding machine is configured to adjust a time difference between a first injection start timing of the material injected from the first injection apparatus and a second injection start timing of the material injected from the second injection apparatus.

First claim

What is claimed is:

1 . A method of controlling an injection molding machine comprising a step of
adjusting a time difference between a first injection start timing of a first material injected from a first injection apparatus performing an injecting operation of the first material, based on a first injection start signal for the first injection apparatus output from a central controller centrally controlling an injection molding operation, and a second injection start timing of a second material injected from a second injection apparatus performing an injecting operation of the second material based on a second injection start signal for the second injection apparatus output from the central controller, the method further comprising steps of: (a) generating a synchronization signal by a synchronization signal generator, based on a command from the central controller; (b) controlling the first injection apparatus; and (c) controlling the second injection apparatus, wherein the step (b) includes steps of:
(b1) inputting the first injection start signal to a first controller;
(b2) inputting the synchronization signal to the first controller;
(b3) measuring elapse of a first predetermined time from input of the synchronization signal;
(b4) outputting a first command signal from the first controller to a first servo amplifier after the elapse of the first predetermined time measured in the step (b3); and
(b5) controlling an opening degree of a first servo valve by the first servo amplifier, and
the step (c) includes steps of:
(c1) inputting the second injection start signal to a second controller;
(c2) inputting the synchronization signal to the second controller;
(c3) measuring elapse of a second predetermined time from input of the synchronization signal;
(c4) outputting a second command signal from the second controller to a second servo amplifier after the elapse of the second predetermined time measured in the step (c3); and
(c5) controlling an opening degree of a second servo valve by the second servo amplifier.

2 . The method of controlling the injection molding machine according to claim 1 ,
wherein the first predetermined time and the second predetermined time are the same as each other.

3 . The method of controlling the injection molding machine according to claim 1 ,
wherein the first predetermined time and the second predetermined time are different from each other.

Assignees

• Japan Steel Works Ltd

Inventors

• Satoshiro Atsushi
• Toyoshima Toshio

Classifications

• B29C2945/76555

  start · CPC title

• B29C2945/76498

  Pressure · CPC title

• B29C2945/76973

  By counting · CPC title

• B29C2945/76066

  Time · CPC title

• B29C2945/76678

  injection piston · CPC title