Patent ID: 7657989
Filing Date: 2010-02-09
Classification: B21D,B23P,F16B,Y10T

Abstract:
1. Method for the attachment of a functional element ( 14 ) having a head end ( 20 ) and optionally a shaft part ( 22 ) to a sheet metal part ( 12 ), optionally in liquid-tight and/or gas-tight form, wherein the functional element is pressed against the sheet metal part ( 12 ) supported by a die button having a shaping space ( 62 ) and sheet metal material is pressed by means of at least one movably mounted shaped part ( 50 ), and preferably by means of at least two such shaped parts ( 50 ) of the die button, and by a radially inwardly directed movement of the or each shaped part, into an undercut of the functional element ( 14 ), with the or each shaped part forming a respective wall region of the shaping space ( 62 ), wherein the or each shaped part ( 50 ) is initially radially supported by a surface ( 88 ) of an abutment element and is prevented from a radially inwardly directed movement so long until the sheet metal material is drawn by the head end ( 20 ) of the functional element ( 14 ) into the shaping space ( 62 ) for the formation of a pronounced recess ( 87 ) at least largely surrounding the head end and is only then released by an axial movement of the surface ( 88 ) past the or each shaped part for the radial movement for the pressing of the sheet metal material into the undercut.