Control device for servo die cushion

A control device for a servo die cushion, for controlling a die cushion which generates a force applied to a slide by using a servomotor as a driving source, the control device comprising:

• a force commanding part for commanding a force to be generated between the slide and the die cushion;
• a force detecting part for detecting a force generated between the slide and the die cushion;
• a slide speed detecting part for detecting a speed of the slide;
• and
• a die cushion speed commanding part for commanding a speed of the die cushion based on the force commanded by the force commanding part and the force detected by the force detecting part, wherein
• the die cushion speed commanding part is configured to calculate a threshold based on an absolute value of the speed of the slide detected by the slide speed detecting part and to generate a speed command of the die cushion such that an absolute value of the speed command of the die cushion is equal to or smaller than the threshold, and the die cushion speed commanding part is configured to calculate the threshold by multiplying the absolute value of the detected speed of the slide by a constant larger than one.

A control device for a servo die cushion, for controlling a die cushion which generates a force applied to a slide by using a servomotor as a driving source, the control device comprising:

• a force commanding part for commanding a force to be generated between the slide and the die cushion;
• a force detecting part for detecting a force generated between the slide and the die cushion;
• a slide speed commanding part for generating a speed command of the slide based on the force commanded by the force commanding part and the force detected by the force detecting part;
• and
• a die cushion speed commanding part for commanding a speed of the die cushion, wherein
• the die cushion speed commanding part is configured to calculate a threshold based on an absolute value of the speed command of the slide generated by the slide speed commanding part and to generate a speed command of the die cushion such that an absolute value of the speed command of the die cushion is equal to or smaller than the threshold, and the die cushion speed commanding part is configured to calculate the threshold by adding a positive value to the absolute value of the speed command of the slide.

A control device for a servo die cushion, for controlling a die cushion which generates a force applied to a slide by using a servomotor as a driving source, the control device comprising:

• a force commanding part for commanding a force to be generated between the slide and the die cushion;
• a force detecting part for detecting a force generated between the slide and the die cushion;
• a slide speed commanding part for generating a speed command of the slide based on the force commanded by the force commanding part and the force detected by the force detecting part;
• and
• a die cushion speed commanding part for commanding a speed of the die cushion, wherein
• the die cushion speed commanding part is configured to calculate a threshold based on an absolute value of the speed command of the slide generated by the slide speed commanding part and to generate a speed command of the die cushion such that an absolute value of the speed command of the die cushion is equal to or smaller than the threshold, and the die cushion speed commanding part is configured to calculate the threshold by multiplying the absolute value of the speed command of the slide by a constant larger than one.