FORMING A COLLAR AROUND A HOLE IN A SHEET METAL BLANK

A method and conversion apparatus for the conversion into a collar of an edge portion around a hole in a blank is described. The method comprises the stepwise turning-up of adjacent parts of the edge portion untill the full edge portion has been converted into a desired collar. The conversion appara...

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Bibliographische Detailangaben
Hauptverfasser:	FRIEDRICH WILHELMUS THOOLEN, LOUIS MARIA ZONNEVELD
Format:	Patent
Sprache:	eng
Schlagworte:	MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A method and conversion apparatus for the conversion into a collar of an edge portion around a hole in a blank is described. The method comprises the stepwise turning-up of adjacent parts of the edge portion untill the full edge portion has been converted into a desired collar. The conversion apparatus comprises means for rotating the blank and a converter-mandrel of which the surface of rotation increases non-linearly from one extremity to the other extremity. Moving the converter-mandrel through the hole perpendicular to the surface of the blank and in contact with the edge portion turns up adjacent parts of the edge portion.