Patent ID: 8047740
Filing Date: 2011-11-01
Classification: B21J,B23K,F16B,Y10T

Abstract:
1. Friction-welded connection between a sheet metal element and a therein inserted rotation body, the rotation body comprising: a stem portion, a flange portion extending radially from a distal end of the stem portion, and an enlarging portion shaped as a truncated cone and a drilling tip disposed one after the other along an axis of rotation of the rotation body, wherein the drilling tip has a proximal end extending downwardly from a circular-shaped distal end of the enlarging portion and a point on a distal end thereof, and the outer surface of the drilling tip being shaped such that when the enlarging portion and the drilling tip are viewed in a direction perpendicular to the axis of rotation, outer edges of the outer surface of the drilling tip on opposite sides of the axis are seen to extend from the distal end of the enlarging portion in a steadily downwardly and inwardly curving manner toward the axis of rotation, and to meet at the point at the distal end of the drilling; and a nozzle formed by an annular wall of the sheet metal, said nozzle having a friction surface having a shape corresponding to a corresponding area of the truncated-conical shape of an outer surface of the enlarging portion; said enlarging portion sits in the nozzle formed by the annular wall of the sheet metal in such a way that positioning of the rotation body exposes an increasing pressure on the annular wall, wherein between the rotation body and the nozzle a friction-weld is formed along the outer surface of the enlarging portion and the corresponding shape of the nozzle by the rotation of the rotation body.