Control method of die-casting machine
AssigneeToyo Machinery & Metal Co., Ltd.
InventorYoshiya Taniguchi
Life of this patent
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Abstract
A die-casting machine using an electric servo motor as a driving source for injecting/filling molten metal into a cavity of a mold through an injection sleeve. The molten metal in the injection sleeve is injected/filled into the cavity by an injection member. During the course between the stage when the molten metal has not reached a gate of the mold yet and the stage when the molten metal begins to pass the gate of the mold, the speed of the injection member is controlled to be accelerated in a smooth speed characteristic curve which does not have a broken-line characteristic. Thus, rising to a high injection speed can be attained rapidly and smoothly.
Claims9
A control method of a die-casting machine for injecting/filling molten metal into a cavity of a mold through an injection sleeve, the control method comprising the steps of:
- transferring a driving force of an electric servo motor to an injection member, by which a molten metal in an injection sleeve is injected into the cavity, through a fly-wheel and a crank mechanism, in which a force input terminal thereof is connected to the fly-wheel, and
- transferring the driving force of the servo motor to the injection member through the fly-wheel and the crank mechanism during a course between a stage where the molten metal has not vet reached a gate of the mold and a stage where the molten metal begins to pass the gate of the mold so as to accelerate the speed of the injection member in a smooth speed characteristic curve, which does not have a broken-line characteristic.
A control method of a die-casting machine including an injection plunger moving forward and backward in an injection sleeve, a first electric servo motor and a second electric servo motor as driving sources for the injection plunger, a ball screw mechanism for converting a rotational force of the first electric servo motor into a linear motion to thereby drive the injection plunger linearly, and a crank mechanism for converting a rotational force of the second electric servo motor into a linear motion to thereby drive the injection plunger linearly, the injection plunger being driven linearly with cooperation of the first and second electric servo motors, the control method comprising the step of:
- controlling a speed of the injection plunger by use of a speed ratio characteristic of the crank mechanism when the molten metal in the injection sleeve is injected/filled into a cavity of a mold, so as to accelerate the speed of the injection plunger in a smooth speed characteristic curve, which does not have a broken-line characteristic, during a course between a stage where the molten metal has not reached a gate of the mold yet and a stage where the molten metal begins to pass the gate of the mold.
Dependencies are inferred from the claim text.