Floating cutter unit and trimming press processing device

A trimming press processing device, comprising:

• a trimming press lower die;
• a main trimming press upper die configured to move toward the trimming press lower die to cut off a scrap other than a product part from a plate material between the main trimming press upper die and the trimming press lower die along a trim line;
• a floating cutter unit configured to move together with the main trimming press upper die toward the trimming press lower die to cut off the scrap from the plate material between the trimming press lower die and the floating cutter unit together with the main trimming press upper die;
• a scrap cutting press lower die positioned with a space from a cutting edge of the trimming press lower die at a distance corresponding to a plate thickness of the plate material in a direction of moving of the main trimming press upper die;
• and
• a scrap cutting press upper die, configured to move together with the main trimming press upper die to divide the scrap along a scrap cut line between the scrap cutting press upper die and the scrap cutting press lower die,
• wherein the floating cutter unit comprises:
• a floating cutter aligned with the main trimming press upper die along the trim line to cut the scrap from the plate material together with the main trimming press upper die,
• a pair of cutters positioned between the main trimming press upper die and the floating cutter and formed of a metal with a greater hardness than the main trimming press upper die, the pair of cutters being aligned with the floating cutter and the main trimming press upper die along the trim line to cut the scrap from the plate material together with the floating cutter and the main trimming press upper die, a first one of the pair of cutters being positioned on a first side of the floating cutter and a second one of the pair of cutters being positioned on a second side of the floating cutter that is opposite the first side of the floating cutter,
• a holder set to which the pair of cutters are fixated, the holder set holding the floating cutter in a manner that allows the floating cutter to move and slide relative to the pair of cutters in a direction of an axial center of the floating cutter, and
• a fluid cylinder in contact with a tail end surface of the floating cutter to give a reaction force to the floating cutter, the fluid cylinder being configured to allow the floating cutter to move relative to the holder set in a direction opposite to the direction of moving the pair of cutters while pushing the floating cutter against the scrap cutting press lower die after cutting off the scrap,
• wherein the main trimming press upper die comprises a cutting edge configured to cut off the scrap, wherein the floating cutter comprises a cutting edge configured to cut off the scrap, and the pair of cutters each comprises a cutting edge configured to cut off the scrap, and
• wherein the cutting edges of the pair of cutters are formed of the metal with the greater hardness than the cutting edge of the main trimming press upper die.