Groz-beckert Kg

Siegfried Beerhalter

Hans Joachim Halamoda

Ernst Heinemann

Hans-Joachim Halamoda

A punching tool for green sheets or similar sheet-like work-pieces having a support plate with punched holes (), and a holding-down plate disposed above the support plate and containing stripper openings (). Operative portions () of dies () extend through the stripper openings () and are guided therein. The operative portions () are formed in graduated form with a punching portion () of reduced diameter. Each punching portion () has a length that is less than the length of the stripper opening (), and is located entirely in the stripper opening () when the die () is at its top dead center. A part () of the operative portion () protrudes into the stripper opening () to guide the die (). The punching portion () is only approximately as long as required for the punching stroke of the die (). The slight length of the punching portion () makes possible an especially slender punching portion, and thus the creation of especially small punched holes.

Device for punching green sheets

The punching die of the invention has a headheld by positive engagement. The headis held on the shaftof the diein that by means of plastic deformation, for instance by radial application of pressure, material is positively displaced radially inward, so that a protrusionis embodied which rests over a large area on the wall of a recess. A more secure, more durable force transition is assured.

Punching device and punching die for it

An improved punching tool () has a lower tool (), which is subdivided into a lower tool base plate () and a lower-tool operative part (). The lower tool base plate () has a receiving face, with which uniform base areas of a plurality of lower-tool operative parts () are associated. The dividing place between the lower-tool operative part () and the lower tool base plate () is disposed such that all the workpiece-specific designs are present exclusively on the lower-tool operative part (), while the lower tool base plate () is the same, without change, for all workpieces to be machined.

Punching tool with re-usable, neutral structural groups

A stamping device includes a base body; an elongated punch having a longitudinal axis; a supporting arrangement for holding the punch in the base body and for guiding the punch for axial displacements between an advanced position and a retracted position; a driving unit releasably held in the base body and including a driving device for axially displacing the punch; a coupling device having a first state in which the coupling device operatively connects the driving device with the punch and a second state in which the driving device is disconnected from the punch; and a receiving arrangement for holding the punch in a desired axial position when the coupling device is in its second state.

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Schwäbisch Gmünd, Germany

Siegfried Beerhalter