Servo press line operation method and servo press line operation control device

Patent metadata

Field	Value
Publication number	US-9643232-B2
Application number	US-201414290649-A
Country	US
Kind code	B2
Filing date	May 29, 2014
Priority date	May 30, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A servo press line operation method operates a servo press line in which a servo press and a servo transfer device are disposed in a workpiece transfer direction. The servo press line operation method includes causing a transfer controller to receive a master signal that causes the servo transfer device to make a motion in synchronization with the servo press, the transfer controller controlling a motor of the servo transfer device using a motor instruction, causing the transfer controller to determine whether or not an abnormality in the master signal has occurred, and causing the transfer controller to generate the motor instruction based on a stop signal that stops the motor of the servo transfer device, instead of the master signal, when the transfer controller has determined that an abnormality in the master signal has occurred.

First claim

What is claimed is:

1. A method for operating a servo press line in which a servo press and a servo transfer device are disposed in a workpiece transfer direction, the method comprising:
causing a transfer controller and a press controller to receive a master signal that causes the servo transfer device to make a motion in synchronization with the servo press, the transfer controller controlling a motor of the servo transfer device using a motor instruction and the press controller controlling a motor of the servo press using a motor instruction;
causing the transfer controller to determine whether or not an abnormality in the master signal has occurred;
causing the transfer controller to generate the motor instruction based on a stop signal that stops the motor of the servo transfer device, instead of the master signal, when the transfer controller has determined that an abnormality in the master signal has occurred;
causing the transfer controller to determine whether or not the servo transfer device is moving in a direction to enter a press area, the press area being an interference area with the servo press,
wherein the motor of the servo transfer device stops in a predetermined normal time based on a stop instruction from the master signal,
wherein, when the transfer controller has determined that an abnormality in the master signal has occurred, the transfer controller selects one of different types of the stop signals corresponding to a determination result as to whether or not the servo transfer device is moving in a direction to enter the press area, and
wherein the transfer controller selects a first stop signal, which stops the motor of the servo transfer device in a predetermined first stop time that is shorter than the predetermined normal time, when the transfer controller has determined that the servo transfer device is moving in a direction to enter the press area.

2. A method for operating a servo press line in which a servo press and a servo transfer device are disposed in a workpiece transfer direction, the method comprising:
causing a transfer controller and a press controller to receive a master signal that causes the servo transfer device to make a motion in synchronization with the servo press, the transfer controller controlling a motor of the servo transfer device using a motor instruction and the press controller controlling a motor of the servo press using a motor instruction;
causing the transfer controller to determine whether or not an abnormality in the master signal has occurred;
causing the transfer controller to generate the motor instruction based on a stop signal that stops the motor of the servo transfer device instead of the master signal, when the transfer controller has determined that an abnormality in the master signal has occurred;
causing the transfer controller to determine whether or not the servo transfer device is moving in a direction to enter a press area, the press area being an interference area with the servo press,
wherein the motor of the servo transfer device stops in a predetermined normal time based on a stop instruction from the master signal,
wherein, when the transfer controller has determined that an abnormality in the master signal has occurred, the transfer controller selects one of different types of the stop signals corresponding to a determination result as to whether or not the servo transfer device is moving in a direction to enter the press area, and
wherein the transfer controller selects a second stop signal, which stops the motor of the servo transfer device in a predetermined second stop time that is longer than the predetermined normal time, when the transfer controller has determined that the servo transfer device does not move in a direction to enter the press area.

3. A method for operating a servo press line in which a servo press and a servo transfer device are disposed in a workpiece transfer direction, the method comprising:
causing a transfer controller and a press controller to receive a master signal that causes the servo transfer device to make a motion in synchronization with the servo press, the transfer controller controlling a motor of the servo transfer device using a motor instruction and the press controller controlling a motor of the servo press using a motor instruction;
causing the transfer controller to determine whether or not an abnormality in the master signal has occurred;
causing the transfer controller to generate the motor instruction based on a stop signal that stops the motor of the servo transfer device, instead of the master signal, when the transfer controller has determined that an abnormality in the master signal has occurred;
causing the transfer controller to determine whether or not the servo transfer device is moving in a direction to enter a press area, the press area being an interference area with the servo press;
causing the transfer controller to determine whether or not an abnormality in power supply voltage has occurred, the power supply voltage being supplied to the servo transfer device; and
causing the transfer controller to generate the motor instruction that stops the motor of the servo transfer device in a given time independently of the master signal and the stop signal when the transfer controller has determined that an abnormality in the power supply voltage has occurred,
wherein the motor of the servo transfer device stops in a predetermined normal time based on a stop instruction from the master signal,
wherein, when the transfer controller has determined that an abnormality in the master signal has occurred, the transfer controller selects one of different types of the stop signals corresponding to a determination result as to whether or not the servo transfer device is moving in a direction to enter the press area, and
wherein the transfer controller designates a time that is shorter than a predetermined time required to stop the motor of the servo transfer device using the master signal as the given time when the transfer controller has determined that an abnormality in the power supply voltage has occurred and determined that the servo transfer device is moving in a direction to enter the press area.

4. A method for operating a servo press line in which a servo press and a servo transfer device are disposed in a workpiece transfer direction, the method comprising:
causing a transfer controller and a press controller to receive a master signal that causes the servo transfer device to make a motion in synchronization with the servo press, the transfer controller controlling a motor of the servo transfer device using a motor instruction and the press controller controlling a motor of the servo press using a motor instruction;
causing the transfer controller to determine whether or not an abnormality in the master signal has occurred;
causing the transfer controller to generate the motor instruction based on a stop signal that stops the motor of the servo transfer device, instead of the master signal, when the transfer controller has determined that an abnormality in the master signal has occurred;
causing the transfer controller to determine whether or not the servo transfer device is moving in a direction to enter a press area, the press area being an interference area with the servo press;
causing the transfer controller to determine whether or not an abnormality in power supply voltage has occurred, the power supply voltage being supplied to the servo transfer device; and
causing the transfer controller to generate the motor instruction that stops the motor of the servo transfer device in a given time independently of the master signal and the stop signal when the transfer controller has determined that an abnormality in the power supply voltage has occurred,
wherein the motor of

Assignees

• Aida Eng Ltd

Inventors

• Suzuki Satoshi

Classifications

• B21D55/00

  Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass (for presses in general B30B; safety devices in general F16P) · CPC title

• G05B2219/24208

  Go into safety mode if communications are interrupted · CPC title

• G05B2219/39105

  Manipulator cooperates with moving machine, like press brake · CPC title

• G05B2219/45142

  Press-line · CPC title

• Y02P90/08

  Cross-Sectional Technologies · mapped topic