Patent ID: 6637102
Filing Date: 2003-10-28
Classification: B26F,B32B,H05K,Y10T

Abstract:
A fabrication method of an industrial part having high-aspect-ratio through-hole sections using a punch and a die, comprising:a first step of drilling a first hole section in a first sheet of sheet material with said punch; a second step of lifting said first sheet in tight contact with a stripper under a condition that said punch is not pulled out from the first hole section; a third step of lifting said punch so that a tip section of said punch is slightly drawn in from a bottom section of said lifted first sheet of sheet material; a fourth step of drilling a second hole section in a second sheet of sheet material with said punch; a fifth step of lifting said second sheet in tight contact with said first sheet under a condition that said punch is not pulled out from the second hole section; and a sixth step of lifting said punch so that a tip section of said punch is slightly drawn in from the bottom section of said lifted second sheet of sheet material, whereinthe fourth to sixth steps are repeated for lamination of a plurality of sheets of sheet material.