Patent ID: 6434989
Filing Date: 2002-08-20
Classification: B21D,Y10T

Abstract:
Method of producing a leadthrough on a hollow profile, the hollow profile being acted upon by a fluidic pressure in an internal high-pressure forming tool, and a secondary shaped element being formed outwards in the radial direction from the hollow profile by the fluidic pressure, comprising:reverse drawing the secondary shaped element into an interior of the hollow profile by way of a punch at a prevailing internal high pressure, and to open the leadthrough, cutting a punched slug out of a base of the reverse-drawn secondary shaped element by way of the punch, wherein two said secondary shaped elements are formed out of the hollow profile at two opposite locations, wherein the respective secondary shaped elements are each reverse drawn, after forming, into the hollow profile interior by a punch in such a way that the bases come to bear inside the hollow profile in a final state of the reverse drawing, and wherein the punched slug is severed from the respective base by one of the punches serving as a plunging punch plunging into the other punch.