PUNCH AND METHOD FOR FORMING OPPOSING HOLES IN A HOLLOW PART, AND A PART FORMED THEREFROM

A punch, apparatus and method for forming opposing holes in a hollow part, and a part formed therefrom. The punch includes an end portion adapted to pierce an entry hole and bend material around the entry hole to form a retained slug along an inner edge of the entry hole. The punch also includes an...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	BLISS, MARTIN, L, DUNN, DAVID, J, COELHO, JOSE, U
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CUTTING CUTTING-OUT HAND CUTTING TOOLS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORATING PERFORMING OPERATIONS PUNCHING PUNCHING METAL SEVERING SEVERING BY MEANS OTHER THAN CUTTING STAMPING-OUT TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A punch, apparatus and method for forming opposing holes in a hollow part, and a part formed therefrom. The punch includes an end portion adapted to pierce an entry hole and bend material around the entry hole to form a retained slug along an inner edge of the entry hole. The punch also includes an enlarging portion adapted to enter the entry hole after the end portion to enlarge the entry hole by bending the slug and additional material towards the interior of the part. The punch has a length greater than a cross-section of the part such that further advancement of the punch through the part punches an exit hole in the part opposite the entry hole.