Punch profile for a punch, and the assembly in which the punch is used

A punch comprising:

• a cylindrical punch body having a first end surface and a second, opposite end surface, said surfaces being parallel, said punch body defining a perimeter;
• a punch wall extending upwardly from said second end surface and having a free end, said punch wall extending around the entire perimeter of said punch body, said punch wall having an exterior surface and an interior surface, said punch wall formed of a plurality of alternating flutes and lobes, each said lobe having a pair of walls angling from a piercing point;
• a punch profile formed on said free end of said punch wall and extending between said exterior surface of said punch body and said interior surface of said punch body, said punch profile formed by a cutting surface and a shearing surface, said cutting surface having a first end and a second end and a positive cut edge geometry, said cutting surface extending around the entire perimeter of said punch wall, said cutting surface extending between said exterior surface of the punch wall and said shearing surface, said cutting surface tapering inwardly from said exterior surface toward said second end surface of said punch body such that the distance said first end of said cutting surface is spaced from said second end surface of said punch body is greater than the distance said second end of said cutting surface is spaced from the second end surface of said punch body, said shearing surface extending between said cutting surface and said interior surface of the punch wall, said shearing surface being spaced from said second end surface of said punch body at a lesser distance than a distance at which said first end of said cutting surface is spaced from said second end surface of said punch body;
• and
• a passageway extending through said punch body, said passageway spaced from said punch wall.