Press machine braking performance verifying apparatus

A press machine braking performance verifying apparatus for verifying performance of brakes which apply braking to a slide of a press machine, the press machine braking performance verifying apparatus comprising:

• a slide speed sensor configured to detect a slide driving speed at which the slide is driven and output a slide speed signal indicating the detected slide driving speed;
• a controller arranged to receive the slide speed signal from the slide speed sensor and to receive an emergency stop instruction signal from an emergency stop instruction device of the press machine, the emergency stop instruction signal being a signal instructing the slide to be stopped;
• and
• an indication device configured and arranged to be operated by signals from the controller,
• the controller being programmed to
• measure a stopping time from when a stopping instruction is detected until the slide stops, the stopping time being a sum of an idle time from detecting of a stopping instruction until a start of braking and a braking time from the start of braking until stopping of the slide,
• calculate a predicted stopping time in a case where the slide is driven at a maximum driving speed by
• determining a deceleration coefficient based on
• the slide driving speed at a predetermined timing during the braking time and
• an amount of time from the predetermined timing to stopping of the slide,
• calculating a fixed stopping time by adding the idle time to the time from the start of braking until the predetermined timing, and
• calculating the predicted stopping time based on a fixed stopping time, the maximum driving speed of the slide, and the deceleration coefficient,
• execute a performance evaluation of the brakes by comparing the predicted stopping time and a threshold value set in advance, and
• output a notification signal indicating a result of the performance evaluation to the indication device.

A press machine, comprising

• a slide;
• a brake arranged and configured to brake the slide;
• a slide speed sensor configured to detect a slide driving speed at which the slide is driven and output a slide speed signal indicating the detected slide driving speed;
• an emergency stop instruction device configured to generate an emergency stop instruction signal, the emergency stop instruction signal being a signal instructing the slide to be stopped;
• and
• a controller programmed to control operation of the slide and the brake, the controller arranged to receive the slide speed signal from the slide speed sensor and to receive the emergency stop instruction signal from the emergency stop instruction device,
• the controller including a press machine braking performance verifying section programmed to
• measure a stopping time from when a stopping instruction is detected until the slide stops, the stopping time being a sum of an idle time from detecting of a stopping instruction until a start of braking and a braking time from the start of braking until stopping of the slide,
• calculate a predicted stopping time in a case where the slide is driven at a maximum driving speed by
• determining a deceleration coefficient based on
• the slide driving speed at a predetermined timing during the braking time and
• an amount of time from the predetermined timing to stopping of the slide,
• calculating a fixed stopping time by adding the idle time to the time from the start of braking until the predetermined timing, and
• calculating the predicted stopping time based on a fixed stopping time, the maximum driving speed of the slide, and the deceleration coefficient, and
• execute a performance evaluation of the brakes by comparing the predicted stopping time and a threshold value set in advance.