Patent ID: 6212982
Filing Date: 2001-04-10
Classification: B21D,F28F,Y10T

Abstract:
A method for manufacturing a slot-shaped opening on a hollow section of a workpiece utilizing a blade-type cutting tool, comprising the steps of:continuously supporting an interior side of the hollow section by an internal high pressure fluid supplied into the hollow section;pressing or calibrating an exterior side of the hollow section against a contoured face of a carrier for the cutting tool by way of the internal high pressure fluid supplied in the hollow section, the face of the cutting tool carrier forming a portion of a recess for supporting the hollow section;piercing the hollow section by moving the cutting tool relative to the hollow section, wherein the piercing step includes one of:(i) penetrating the cutting tool into a material of the hollow section and then stopping the penetration, and(ii) penetrating the cutting tool into a material of the hollow section and continuing through an interior wall of the hollow section; anddisplaceably flowing a portion of the material of the hollow section which is pierced by the cutting tool laterally away from the cutting tool and into the hollow section to form the slot-shaped opening having a wall thickness around the slot-shaped opening, the material of the hollow section being flowable due to the internal high pressure fluid supplied into the hollow section.