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Signature analysis for press strokes.

"They wouldn't buy our CIM concept-not even our own plants," says Michael O'Brien, manager, factory automation, Johnson Controls Inc. "No one listened to us until we had a proved application that actually worked ! "We now have that product, a wholly automatic press-management automation system that provides 100-percent inspection of every pressed, stamped, sheared, or formed part. Equally important, the real-time monitoring function protects both dies and presses. The system can be a first step toward computer integrated manufacturing (CIM) at reasonable cost."

The Press Management Automation (PMA) system employs real-time software modules, an engineering workstation, a cell computer, and a factory communications network. Major software components include a unique signature analysis module that performs automatic quality inspection by monitoring the force exerted by the press through the dies. Johnson asserts that this is more than simple force measurement.

The program also has a part-ejection module that protects dies and presses from damage. The flexible system employs up to 16 sensors, making up to 1000 measurements per hit. The computer processes 0,000 measurements/sec, which translates to about 300 spm as the normal limit-with modifications possible to handle faster press speeds.

The PMA system uses a YEWMAC cell computer, which Johnson Controls distributes in the US. It's produced by Yokogawa Electric Corp, Tokyo, Japan, said to be the world's largest manufacturer of process controls. The computer provides a distributed manufacturing-control system designed to control a variety of consecutive, real-time, production-line occurrences.

General Manager Dennis L Euers says, "Unlike computers with familiar names, the Yewmac has sufficient configuration flexibility to handle a wide variety of applications for both large and small users. Some 4500 systems have been sold

worldwide, but it's a new product for North America. We will focus it on practical applications as we enter the factory-automation market."

For more information, contact Johnson Controls, Systems Engineering and Construction Div, M-48, PO Box 423, Milwaukee, WI 53201-0423, circle 574.0102
COPYRIGHT 1989 Nelson Publishing
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Publication:Tooling & Production
Date:Jan 1, 1989
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