Method for controlling flow rate by change-over of table speed in hydraulic press and device therefor

Abstract

Abstract PURPOSE:To prevent a shock at the time of change-over of speed by detecting oil temperature, calculating the optimum flow rate to the detected temperature and controlling a proportional valve. CONSTITUTION:A work is bent by a hydraulic press. A table position is detected by an encoder and the speed change-over of a speed change-over valve 3 and the flow rate control of the proportional valve 5 are executed. In this case, the oil temperature is detected by a temperature sensor 25 and the flow rate suitable to the oil temperature is calculated by a CPU 29 to control the flow rate of the proportional valve 5. In this way, a shock at the time of the speed change-over by the change of the oil temperature is prevented, therefore, stable bending can be carried out without moving the work by the shock.

Inventors

• 👤 Yoshinori Kino
• 👤 義紀 城野

Bibliographic Details