Floating cutter unit and trimming press processing device

Patent metadata

Field	Value
Publication number	US-11577298-B2
Application number	US-201916971534-A
Country	US
Kind code	B2
Filing date	Feb 13, 2019
Priority date	Feb 22, 2018
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

The present invention increases the positional accuracy of a floating cutter unit with respect to a press upper die for main trimming. A floating cutter unit is provided with: a floating cutter for cutting scrap from a plate-shaped material, said floating cutter being attached to and used in a trimming press processing device that cuts scrap from a plate-shaped material along a trim line Tr and that additionally cuts scrap along a scrap cut line Sc; a spring that is brought into contact with the tail end surface of the floating cutter and with a holder set for holding the floating cutter so as to be movable in the direction of an axial center O, and that applies reaction force to the floating cutter; and a guide member that is attached to the holder set, brought into contact with the floating cutter, and used to guide movement in the direction of the axial center O.

First claim

The invention claimed is:

1. A floating cutter unit for use with a trimming press processing device, the floating cutter unit comprising:
a floating cutter having a first side surface, a second side surface, a tail end surface above the first side surface and the second side surface, and a cutting edge at a bottom edge of the first side surface, the first side surface and the second side surface being on opposite sides of the floating cutter offset from and extending in parallel to a central axis of the floating cutter so that the central axis of the floating cutter extends between the first side surface and the second side surface;
a holder set configured to hold the floating cutter and allow the floating cutter to move in a direction of the central axis of the floating cutter;
a spring in contact with the tail end surface of the floating cutter, the spring being configured to apply a reaction force to the floating cutter;
a first guide member fixed to the holder set, the first guide member comprising a first guide surface that is configured to guide a movement of the floating cutter in the direction of the central axis by engaging the second side surface of the floating cutter so that the second side surface of the floating cutter slides along the first guide surface;
a plurality of intermediate side surfaces that extend from the first side surface to the second side surface; and
a plurality of supplemental guide members, each supplemental guide member comprising a supplemental guide surface configured to guide the movement of the floating cutter in the direction of the central axis by engaging a respective one of the intermediate side surfaces so that the respective one of the intermediate side surfaces slides along the supplemental guide surface.

2. The floating cutter unit according to claim 1 , further comprising:
a plurality of trim cutters formed integrally with the plurality of supplemental guide members and extending along a trim line at which a scrap is cut off from a plate material.

3. The floating cutter unit according to claim 1 , further comprising:
a scrap cutter formed integrally with one of the supplemental guide members and configured to extend along a scrap cut line at which a scrap is divided upon being cut off from a plate material.

4. The floating cutter unit according to claim 2 , further comprising:
a scrap cutter formed integrally with one of the supplemental guide members and configured to extend along a scrap cut line at which the scrap is divided upon being cut off from the plate material.

5. The floating cutter unit according to claim 1 , wherein the first guide surface is offset from and extends parallel to the central axis of the floating cutter so that the second side surface of the floating cutter is between the central axis of the floating cutter and the first guide surface.

6. 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 and cut a plate material between the main trimming press upper die and the trimming press lower die along a trim line;
a floating cutter unit comprising:
a floating cutter having a first side surface, a second side surface, a tail end surface above the first side surface and the second side surface, and a cutting edge at a bottom edge of the first side surface, the first side surface and the second side surface being on opposite sides of the floating cutter offset from and extending in parallel to a central axis of the floating cutter so that the central axis of the floating cutter extends between the first side surface and the second side surface;
a holder set configured to hold the floating cutter and allow the floating cutter to move in a direction of the central axis of the floating cutter;
a spring in contact with the tail end surface of the floating cutter, the spring being configured to apply a reaction force to the floating cutter; and
a first guide member fixed to the holder set, the first guide member comprising a first guide surface that is configured to guide a movement of the floating cutter in the direction of the central axis by engaging the second side surface of the floating cutter so that the second side surface of the floating cutter slides along the first guide surface;

a scrap cutting press lower die, which is positioned with a space from a cutting edge of the trimming press lower die at a distance larger than a plate thickness of the plate material in a direction in which the main trimming press upper die moves; and
a scrap cutting press upper die, configured to move together with the main trimming press upper die and 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 is configured to 1) move together with the main trimming press upper die toward the trimming press lower die, 2) cut the plate material between the trimming press lower die and the floating cutter unit, and 3) cut off, together with the main trimming press upper die, a scrap other than a product part from the plate material, and
wherein the floating cutter unit is configured so that when the floating cutter that has cut off the scrap is pressed against the scrap cutting lower die, the floating cutter is moved relative in a reverse direction to the direction in which the main trimming press upper die is moved against to the holder set by compression of the spring.

7. The trimming press processing device according to claim 6 , wherein the cutting edge of the floating cutter is configured to extend along the trim line.

Assignees

• Oiles Industry Co Ltd

Inventors

• Kiriaki Hideki
• Tanahashi Junichi
• Abe Satoshi

Classifications

• B21D45/02

  Ejecting devices · CPC title

• B21D37/12 Primary

  Particular guiding equipment, {e.g. pliers}; Special arrangements for interconnection or cooperation of dies · CPC title

• B21D28/14 Primary

  Dies (ejecting or stripping-off devices arranged in punching machines or tools B21D45/00) · CPC title

• B21D37/10

  Die sets; Pillar guides · CPC title

• B21D28/34 Primary

  Perforating tools; Die holders · CPC title