Injection molding machine controlling drive of movable part with motor

Patent metadata

Field	Value
Publication number	US-10150238-B2
Application number	US-201615146028-A
Country	US
Kind code	B2
Filing date	May 4, 2016
Priority date	May 12, 2015
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

In an injection molding machine, a predetermined torque limit value set in advance and acceleration/deceleration torque calculated by an acceleration/deceleration torque calculation section are added to set an output torque limit value for a motor. By this operation, quick acceleration or deceleration can be achieved in an injection process, and breakage of a mold and mechanism section of the injection molding machine can be prevented.

First claim

The invention claimed is:

1. An injection molding machine that controls drive of a movable part with a motor, the injection molding machine comprising:
a speed instruction section for issuing an instruction of a speed and an acceleration of the movable part;
an acceleration/deceleration torque calculation section for calculating torque necessary for the change of the speed instructed by the speed instruction section; and
an output torque limit setting section for setting an output torque limit for the motor,
wherein the output torque limit setting section adds a predetermined torque limit value set in advance and the acceleration/deceleration torque calculated by the acceleration/deceleration torque calculation section to set an output torque limit value for the motor each time the value of the acceleration instructed by the speed instruction section changes.

Assignees

• Fanuc Corp

Inventors

• Oono Hajime

Classifications

• B29C45/7666 Primary

  of power or energy, e.g. integral function of force · CPC title

• B29C2945/76515

  derivative, change thereof · CPC title

• B29C2945/76692

  drive means · CPC title

• B29C2945/76943

  compare with thresholds · CPC title

• B29C2945/7611

  Velocity · CPC title