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Tryout press with conveyor belt feeder

Bundled expertise facilitates die testing under production conditions

S. Dunkes (Kirchheim/Teck), known as a manufacturer of hydraulic presses for punching, deep drawing, die testing, hydro-forming, and straightening, not only supplies task oriented presses, but also the plants and facilities needed for customised automation. The mid-sized machinery builder solves the associated automation tasks in collaboration with GSW Schwabe AG, located in Kempen. for some time, the company has had a teaming agreement for the installation and commissioning of differential travel presses (make: GSW-Leinhaas) with the specialist for conveyor belt feeders, length, cut to length, and rewinding plants

An example of the bundled expertise of the two companies is the supply of a tryout press with a conveyor belt feeder to test progressive composite dies for mechanical transfer presses. Testing of the dies designed for shearing and forming processes is based on a hydraulic frame press, type HD-W-400, with a press force of 4 000 kN, which is transferred to the 8-fold ram guide by two cylinders. The integrated hydraulic cutting stroke shock absorber with mechanically adjustable depth stop is designed for the maximum press force. This allows combined punch and deep drawing dies, progressive composite and transfer dies to be tested at high ram speeds under production conditions. Several strain gauges record eccentric forces and communicate their effect to the control. The display indicates when a specified threshold value is exceeded and the primary drive is automatically shut down.


The base concept and expansion options of the tryout presses made by Dunkes give manufacturers the ability to test various tools at high speeds, and to rework these before delivery. But since tools are tested based on series production specifications with increasing frequency, which must be documented with the corresponding certifications, the tests need to be appropriately automated, and trial runs must be adapted to the actual production conditions. The conveyor belt feeders made by GSW Schwabe provide the necessary automation requirements to test progressive composite dies. Since the standard configuration of the tryout press is already equipped with the corresponding automation interfaces, it can be easily integrated with the conveyor belt feeder. Dunkes relies on proven Siemens solutions for the plant controls, which are tuned to the respective processes. The data required for programming is entered by the operator using a touch panel in combination with an safety controlled SPS, type S7/317 F. In-house software engineers facilitate the convenient adjustment or new generation of process sequences.


Dunkes tryout presses are available with or without automation facilities, with press forces from 1 000 kN to 40 000 kN. The mid-sized structure and flat organisation of both companies allows the conceptual design of the plants, their assembly, commissioning, as well as the required service to be provided from a single source, and the user benefits from short decision-making paths. The remote service capability provides initial fault analysis with quickly implementable suggestions to address  malfunctions.

Integrating the Dunkes tryout press with a conveyor plant made by GSW Schwabe facilitates automated testing of progressive composite dies under production conditions.

Integrating the Dunkes tryout press with a conveyor plant made by GSW Schwabe facilitates automated testing of progressive composite dies under production conditions.
Tryout press, type HD-W-400, set up to test a
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