# US 8,096,233 B2 · Servo press line operation method and servo press line operation control device

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- Number: US 8,096,233 B2
- Document ID: US8096233B2
- Status: Granted
- Kind: B2
- Application number: 12/497,773
- Filed: 2009-07-06
- Published: 2010-01-07
- Granted: 2012-01-17
- Earliest claimed: 2008-07-07
- Assignees: Aida Engineering, Ltd.
- Inventors: Sotoyuki Kaneko
- Web page: https://patentgrep.com/patent/US8096233B2

## CPC

- B30B 15/148: {Electrical control arrangements}
- B21D 43/05: specially adapted for multi-stage presses {(B21D43/145 takes precedence)}
- B30B 15/146: {for synchronising a line of presses}
- G05B 19/41815: {characterised by the cooperation between machine tools, manipulators and conveyor or other workpiece supply system, workcell}
- G05B 2219/39105: Manipulator cooperates with moving machine, like press brake
- G05B 2219/39143: One program in robot controller for both robot and machine, press, mold
- G05B 2219/45142: Press-line
- Y02P 90/02: Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
- B30B: PRESSES IN GENERAL (producing ultra-high pressure or ultra-high pressure and high temperature to effect modifications of a substance, e.g. for making artificial diamonds B01J3/00 ){(compressing means for refuse receptacles B65F1/1405)}
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A servo press line operation control device includes a normal press operation control section, a normal transfer operation control section, an upward movement step delay determination section, a downstream-side transfer step delay correction control section, an upstream-side transfer step delay determination section, a slide downward movement step delay correction control section, and the like. The servo press line operation control device performs a normal press operation that adjusts a slide position to a target slide position based on slide motion information, performs a normal transfer operation that adjusts a transfer position to a target transfer position based on transfer motion information, performs a correction that delays a transfer step of a downstream-side servo transfer device as compared with the normal transfer operation when a slide upward movement step is in a delayed state, and performs a correction that delays a slide downward movement step of a servo press as compared with the normal press operation when an upstream-side transfer step is in the delayed state.

## Claims

### Claim 1

A method of operating a servo press line in which a servo press having a slide and servo transfer devices are alternately disposed in a workpiece transfer direction, the method comprising the steps of:
performing a normal press operation that adjusts a slide position of the servo press to a target slide position corresponding to a first step phase that is based on slide motion information while causing the first step phase to advance, and performing a normal transfer operation that adjusts a transfer position of the workpiece of each of the servo transfer devices to a target transfer position corresponding to a second step phase that is based on transfer motion information while causing the second step phase to advance, the second step phase being the same as the first step phase;
performing a correction that delays a transfer step of one of the servo transfer devices disposed on a downstream side of the servo press as compared with the normal transfer operation when a slide upward movement step has been determined to be in a delayed state based on a current first step phase in slide upward movement and an apparent first step phase corresponding to a current actual slide position, the apparent first step phase having been calculated from the slide motion information; and
performing a correction that delays a slide downward movement step of the servo press as compared with the normal press operation when an upstream-side transfer step has been determined to be in a delayed state based on a current second step phase in slide downward movement and an apparent second step phase corresponding to a current actual transfer position of the workpiece, the apparent second step phase having been calculated from the transfer motion information of the servo transfer device disposed on an upstream side of the servo press.

### Claim 2

A servo press line operation control device in which a servo press having a slide and servo transfer devices are alternately disposed in a workpiece transfer direction, the operation control device comprising:
a first information storage section that stores slide motion information in which a first step phase is associated with a target slide position;
a normal press operation control section that controls a normal press operation so that a slide position of the servo press is adjusted to a target slide position corresponding to a current first step phase while causing the first step phase that is based on the slide motion information stored in the first information storage section to advance;
a second information storage section that stores transfer motion information in which a second step phase is associated with a target transfer position, the second step phase being the same as the first step phase based on the slide motion information;
a normal transfer operation control section that controls a normal transfer operation so that a transfer position of the workpiece of each of the servo transfer devices is adjusted to a target transfer position corresponding to a current second step phase while causing the second step phase that is based on the transfer motion information stored in the second information storage section to advance;
a slide position detection section that directly or indirectly detects an actual slide position of the servo press;
a first determination section that determines whether or not a slide upward movement step is in a delayed state based on a current first step phase in slide upward movement during the normal press operation and an apparent first step phase corresponding to the detected current actual slide position, the apparent first step phase having been calculated from the slide motion information;
a first correction control section that performs a correction that delays a transfer step of of the servo transfer device disposed on a downstream side of the servo press as compared with the normal transfer operation when the first determination section has determined that the slide upward movement step is in the delayed state;
a transfer position detection section that directly or indirectly detects an actual transfer position of the workpiece of the servo transfer devices;
a second determination section that determines whether or not an upstream-side transfer step is in the delayed state based on a current second step phase in slide downward movement during the normal press operation and an apparent second step phase corresponding to the detected current actual transfer position of the workpiece, the apparent second step phase having been calculated from the transfer motion information corresponding to the servo transfer device disposed on the upstream side of the servo press; and
a second correction control section that performs a correction that delays a slide downward movement step of the servo press as compared with the normal press operation when the second determination section has determined that the upstream-side transfer step is in the delayed state.

### Claim 3 (depends on 2)

The servo press line operation control device as defined in claim 2,
wherein the first determination section determines that the slide upward movement step is in the delayed state when the difference between the current first step phase and the apparent first step phase when the slide is moved upward is larger than a first set phase range; and
wherein the second determination section determines that the upstream-side transfer step is in the delayed state when the difference between the current second step phase and the apparent second step phase when the slide is moved downward is larger than a second set phase range.

### Claim 4 (depends on 2)

The servo press line operation control device as defined in claim 2, further comprising:
a third determination section that determines whether or not a downstream-side transfer step is in the delayed state based on a detected actual transfer position of the workpiece of one of the servo transfer devices disposed on the downstream side of the servo press and a target transfer position corresponding to a current second step phase included in the transfer motion information stored in the second information storage section; and
a third correction control section that performs a correction that delays a transfer step of the servo transfer device disposed on the upstream side of the servo press as compared with the normal transfer operation when the third determination section has determined that the downstream-side transfer step is in the delayed state.

### Claim 5 (depends on 3)

The servo press line operation control device as defined in claim 3, further comprising:
a third determination section that determines whether or not a downstream-side transfer step is in the delayed state based on a detected actual transfer position of the workpiece of one of the servo transfer devices disposed on the downstream side of the servo press and a target transfer position corresponding to a current second step phase included in the transfer motion information stored in the second information storage section; and
a third correction control section that performs a correction that delays a transfer step of the servo transfer device disposed on the upstream side of the servo press as compared with the normal transfer operation when the third determination section has determined that the downstream-side transfer step is in the delayed state.