Servo press control system and servo press control method

• US 7,434,505 B2
• Filed: 09/02/2005
• Issued: 10/14/2008
• Est. Priority Date: 09/15/2004
• Status: Expired due to Fees

• Current Assignee: Komatsu Industries Corporation Japan, Komatsu Ltd.
• Original Assignee: Komatsu Industries Corporation (Komatsu Ltd.), Komatsu Ltd.
• Inventors: Suzuki, Yuichi, Hata, Yukio
• Primary Examiner(s): Nguyen; Jimmy T
• Application Number:
  US11/575,210
• Publication Number:
  US 20080034985A1
• Time in Patent Office: 1,138 Days
• Field of Search: 100/35, 100/43, 100/281, 72/148, 72/149, 72/201, 72/204, 72/211, 72/214, 72/216, 724/41, 724/43, 724/46, 700/19, 700/206, 318/560, 318/567, 318/568.1
• US Class Current: 100/43
• CPC Class Codes: B30B 1/14 operated by cams, eccentrics, or cranks
• CPC Class Codes: B30B 15/148 Electrical control arrangements

Abstract

High production processing and high accuracy processing are selectively performed with a single press. To this end, there are provided a system and method for controlling a servo press 1 in which an eccentric rotation mechanism 20 is driven by a servo motor 21 and the rotating power of the eccentric rotation mechanism 20 is transmitted to a slide 3 through a toggle linkage 15, thereby vertically moving the slide 3. In the control system and method, the rotation of the servo motor 21 is controlled in response to a motor speed command rm calculated based on the deviation ε p of the position of the slide 3 and a positional gain G(θ) preset according to a speed ratio of the slide 3.

Claims

1. A system for controlling a servo press in which an eccentric rotation mechanism is driven by a servo motor, the rotation of which is controlled by a servo amplifier which receives a motor speed command, and the rotating power of the eccentric rotation mechanism is transmitted to a slide through a connecting rod or linkage, thereby vertically moving the slide, comprising:

(a) a slide position detector for detecting a position of the slide;

(b) a slide position deviation computing unit for calculating deviation of the slide position detected by the slide position detector from a target slide position;

(c) a positional gain computing unit for calculating a positional gain according to a speed ratio of the slide; and

(d) a motor speed instructing unit for calculating a motor speed command based on the slide position deviation calculated by the slide position deviation computing unit and the positional gain calculated by the positional gain computing unit and outputting the calculated motor speed command to the servo amplifier.

2. A method for controlling a servo press in which an eccentric rotation mechanism is driven by a servo motor and rotating power of the eccentric rotation mechanism is transmitted to a slide through a connecting rod or linkage, thereby vertically moving the slide,

wherein rotation of the servo motor is controlled in response to a motor speed command calculated based on deviation of a position of the slide and a positional gain corresponding to a speed ratio of the slide.