US 6,673,282 B2 · Method for protecting dies in an injection molding machine

Abstract

A stationary die is held on the front surface of a stationary platen and a movable die is held on the front surface of a movable platen. A plurality of monitoring sections are set in advance within a moving range of the movable platen and an upper limit of forward thrust of the movable platen is set for each of the monitoring sections. When the forward thrust of the movable platen reaches the upper limit set in one of the monitoring sections during a die closing operation, it is determined that abnormality occurs to stop the movable platen from moving forward. If a die closing mechanism is of a toggle link type, the forward thrust of the movable platen is calculated based on the thrust of a crosshead which drives a toggle link mechanism, the moving speed of the crosshead, and the moving speed of the movable platen.

Claims6

Dependent claims

A method for protecting dies in an injection molding machine, the injection molding machine comprising:

a stationary platen which holds a stationary die;
a movable platen arranged opposite to the stationary platen, which holds a movable die;
and
a driving control system which drives the movable platen and performs a die closing operation between the movable die and the stationary die,
wherein the method comprises:
setting a plurality of monitoring sections within a moving range of the movable platen;
setting a monitoring section-dependent upper limit of forward thrust of the movable platen for each of the monitoring sections;
and
performing a die protecting operation when the forward thrust of the movable platen reaches the upper limit set in one of the monitoring sections during the die closing operation.

6 more elements

Dependencies are inferred from the claim text.

Method for protecting dies in an injection molding machine

Life of this patent

Method for protecting dies in an injection molding machine

Life of this patent

Abstract

Claims6