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Quality testing

Product catalog summary

Introduction
The document discusses the retrofitting of a hydraulic press with a draw-wire system for enhanced position feedback, focusing on the need for high accuracy and rugged design in manufacturing environments.

Specifications
The draw-wire system features a measuring range up to 6,250 mm, with options for longer cables up to 42 meters. It is designed for harsh industrial environments, meeting IP65 protection standards, and can transmit up to 25,000 pulses per revolution for high accuracy.

Challenges and Solutions
The Robert Koch Werkzeugbau GmbH & Co. KG faced challenges with an outdated test press that required modifications for precise tool testing. The initial use of proximity sensors was inadequate, leading to the adoption of Wachendorff's draw-wire systems, which provided the necessary accuracy for controlling hydraulic cylinders.

Installation and Operation
The SZG 81 draw-wire system, equipped with the WDG58A encoder, was installed to ensure parallel movement of the tool carrier. The system's compact design allows for flexible installation, and its robust construction ensures a long service life of at least one million cycles.

Benefits
The updated system allows for precise positioning of the press, preventing tool damage and ensuring reliable testing. The control software can accurately influence the hydraulic cylinders, maintaining parallel movement and avoiding skewing.

Conclusion
The integration of the draw-wire system has modernized the test press, enhancing its functionality and reliability in tool testing applications.

Catalog excerpts

MflCHENDORFF Automation GmbH & Co. KG • Easily retrofittable complete system • High accuracy • Rugged housing • Measuring range up to 6,250 mm Rugged & Tough

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Draw-wire system for position feedback with hydraulic presses Demand for greater accuracy and rugged design Updating the test press The Robert Koch Werkzeugbau GmbH & Co. KG of Wuppertal, Germany, is a medium-sized company with a long tradition of manufacturing machine tools as well as top-quality complex stampings. Small plastic mouldings that have to withstand high stress loads, place high performance demands not only on materials scientists but also on those companies which manufacture the tools for their production. Modern moulds for plastic injection machines are ever more delicate and intricate...

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Installation of highly-accurate draw-wire systems After a few months HSI tried a different approach: the proximity switches disappeared from the machine to be replaced by draw-wire systems from the Wachendorff company of Geisenheim. These systems are equipped with an incremental encoder, which provides information on the amount of cable paid out. Only when these position feedback systems were being used, was the accuracy sufficiently high for HSI’s control software to be then able to regulate the hydraulic cylinders on the Hessmert press to the appropriate degree. Wachendorff’s SZG 81 draw-wire...

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Image 3 The encoder outputs provide signals corresponding to the length of wire paid out, enabling the control software to govern the position of the presses more precisely Image 5 Elderly hydraulic press with the latest control technology Image 4 The SZG81 mounted sideways on the press Any Questions? Just call Dieter Schömel +49 (0) 67 22 / 99 65-10, send him an E-Mail at [email protected] or call your local distributor. Please contact your local distributor:

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