Overload protection control method for pressing machine
AssigneesKomatsu Ltd., Komatsu Industries Corporation
InventorKenichi Teraoka
Life of this patent
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Abstract
An overload protection control method for a pressing machine capable of performing overload protection with excellent responsiveness with a simple structure is provided. For this purpose, the overload protection control method includes the steps of driving a slide (4) to reciprocate via a mechanical power transmission mechanism (3) by a servo motor (21), and raising the slide (4) by the servo motor (21) when detecting overload on the slide (4) during pressurization.
Claims3
An overload protection control method for a pressing machine, the method comprising:
- driving a slide to reciprocate via a mechanical power transmission mechanism powered by a servo motor;
- pressurizing the slide;
- detecting a load value on the slide;
- determining whether the load value is greater than a predetermined maximum load value;
- raising the slide by a predetermined amount by the servo motor when the detected load value is determined to be greater than the maximum load value;
- and
- indicating occurrence of an abnormal overload when the detected load value is determined to be greater than the maximum load value.
An overload protection control method for a pressing machine, the method comprising:
- driving a slide to reciprocate via a mechanical power transmission mechanism powered by a servo motor;
- pressurizing the slide;
- detecting a load value on the slide;
- obtaining a maximum load value at a slide stroke;
- adjusting a die height via a die height adjustment motor based on the maximum load value and a predetermined target load value;
- determining whether the load value is greater than the maximum load value;
- and
- raising the slide by the servo motor when the detected load value is determined to be greater than the maximum load value.
Dependencies are inferred from the claim text.