Importance

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Abstract

A strip steel punching and indenting tool (15) and a method for preparing this type of tool wherein the tool, arranged between a ram (12) and an anvil (14) of a punching machine (10), comprises a supporting plate (16) with slots (18) extending from the lower side of the supporting plate facing the anvil (14) to its upper side facing the ram (12). Each of the slots (18) accommodates a cutter of strip steel for punching (20a, 20b) and indenting (20c), in such a way that the hardened cutting edge (22) of a cutter protrudes from the lower side of the supporting plate (16) and the rounded non-cutting backs (24) thereof face a first intermediate plate (26) of metal mounted on the upper side of the supporting plate. To be able to prepare the punching and indenting tool within a short period of time without impairing the punching performance of the punching machine, the first intermediate plate (26) is between 0.8 and 1.5 mm thick, consists of a metal with a 0.2-tensile yield strength R.sub.p0.2 of 20 to 90 N/mm.sup.2, has a tensile strength R.sub.m of 65 to 150 N/mm.sup.2 and a breaking elongation .delta. of 3 to 35%. For preparation there is mounted on the first intermediate plate (26) an elastomer plate (28) which is 0.5 to 1.5 mm thick with a hardness of 60 to 100 Shore A and which is replaced by a second metal intermediate plate during normal operation of the punching machine.

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First Claim