Groz-beckert Kg

Ernst Heinemann

Johannes Bruske

Kuno Horn

Siegfried Beerhalter

Frank Durst

Hans Joachim Halamoda

A tool unit (II) includes an ability to change the width (B) of a punching gap between a first tool () and a second tool (). A plurality of second tools () jointly form a die tool with a circumferential die cutting edge in which the first tool () can engage with a cutting edge (). Between the cutting edge () of the first tool and the respective cutting edge () of a second tool () a punching gap () is formed with a width (B) measured between the cutting edges () across the working direction (A). Via lamping means (), the deformation force acting on a second tool () can act transversely to the working direction (A), whereby the position of the affected cutting edge () and, with it, the width (B) of the punching gap (), can be changed and set.

Method and tool unit for setting a punching gap

For precise alignment of the punch stamps relative to the cutting plates, the respective punch stamp is supported in a floating manner, i.e., in a transversely movable manner, on the head plate associated with the punch stamp. The alignment of the cutting edges of the punch stamp with respect to the cutting edges of the cutting plate is accomplished by at least one stamp guide arrangement that is directly active between the punch stamp and the cutting plate and effects precise relative positioning in a direction transverse to the active cutting edges. The centering elements may extend from the punch stamp through the matrix or cutting plate. Alternatively, the centering elements may extend from the cutting plate through the openings of the punch stamp or extend along sliding or positioning surfaces of the punch stamp.

Punch tool with a stamp supported in a floating manner

A selection plate () is provided on a punch device () for activating or deactivating individual punch holding bars (). The plate has a coupling device () associated with a positive-locking coupling between a punch holding bar () and the selection plate (). Associated with the positive-locking coupling is an edge of the selection plate (), that is provided with a recess (), an extension () of the punch holding bar () that extends around said edge, and/or a rib (), which is located on the underside of the selection plate () and is associated with the punch holding bar (). As a result, it is possible to selectively establish or eliminate a positive-locking connection between the punch holding bar () and the selection plate (). Via the rib (), the punch stroke of the selection plate () is merely transmitted to the punch holding bar (or), which is in positive-locking engagement with the lateral edge or the projections of the selection plate (). The elongated rib () covers the heads () of the punches () and transmits the stroke in a planar manner to the punch holding bar (or).

Punch device with interchangeable punch and variable punch pattern

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.

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Renquishausen, Germany

Ernst Heinemann