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AssigneeDaimlerChrysler AG
InventorsUlrich Haag, Uwe Hardtke, Thomas Huelsberg
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A process for manufacturing holes on the circumference of a hollow section situated in an internal high pressure forming tool uses the action of a punch integrated in the forming tool. A desired breaking point is formed on the hollow section, which follows the edge contour of the operating face of the punch; and after the withdrawal of the punch, the hollow section material surrounded by the desired breaking area, acted upon by internal high pressure, is extracted from the hollow section from the inside to the outside, forming a hole. In order to produce holes on the circumference of hollow sections, in which the shape of the outer circumference of the hollow section is maintained, the wall of the hollow section is weakened to form an unstable thin area. The punch penetrates into the wall of the hollow section at an internal high pressure which corresponds to the forming pressure for forming a hollow blank inserted in the forming tool. When the punch is withdrawn, the internal high pressure, tears the hollow section material surrounded by the thin area out of the hollow section in the withdrawal direction of the punch.
Process for manufacturing holes on the circumference of a hollow section situated in an internal high pressure forming tool, by the action of a punch integrated in the forming tool, a desired breaking area being formed on the hollow section which follows the edge contour of an acting face of the punch, and after the withdrawal of the punch, the hollow section material surrounded by the desired breaking area, acted upon by internal high pressure, being extracted from the hollow section from the inside to the outside while forming a hole, wherein,
Device for producing holes on the circumference of hollow sections, having an internal high pressure forming tool in whose sinking the hollow section is accommodated for producing the respective hole, and having a punch which is displaceable by driving devices and is accommodated in a guide bore starting out from the sinking of the forming tool, the punch projecting in an operative position with the face directed toward the sinking out of the guide bore and acting upon the hollow section for forming a desired breaking point following an edge contour of the punch, and in an inoperative position, being arranged to be completely withdrawn in the guide bore, wherein:
Dependencies are inferred from the claim text.