Cutting device and sheet material manufacturing method

Patent metadata

Field	Value
Publication number	US-11090705-B2
Application number	US-201816181720-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Dec 8, 2017
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A lower die has a first lower-die edge extending along the outline shape of a sheet material, and a plurality of second lower-die edges disposed vertically below the first lower-die edge and each extending in a direction traversing an offcut of a sheet base material that is left behind after the sheet material is punched out. An upper die has a first upper-die edge which extends along the first lower-die edge and between which and the first lower-die edge the sheet base material is shorn to punch out the sheet material, and a plurality of second upper-die edges which is provided so as to be protrusible to vertically below the second lower-die edges and between which and the second lower-die edges the offcut is shorn and divided.

First claim

What is claimed is:

1. A cutting device configured to cut a sheet material out of a sheet base material by shearing, the cutting device comprising:
a lower die; and
an upper die that is movable relative to the lower die, wherein:
the lower die comprises a first lower-die edge configured to extend along a desired outline shape of the sheet material, and a plurality of second lower-die edges disposed vertically below the first lower-die edge and each extending in a direction intersecting an extension direction of the first lower-die edge;
the upper die comprises a first upper-die edge configured to extend in a direction parallel to the extension direction of the first lower-die edge, and a plurality of second upper-die edges that is provided so as to be protrusible to be vertically below the second lower-die edges;
the first upper-die edge and the first lower-die edge being configured to shear the sheet base material along the desired outline shape of the sheet material as the upper die is moved relative to the lower die and the first upper-die edge passes the first lower-die edge to separate a frame-shaped offcut of the sheet base material from the sheet material,
the second upper-die edges being configured to segment the frame-shaped offcut as the second upper-die edges pass the second lower-die edges;
the lower die comprising at least one support part configured to support the sheet material shorn out of the sheet base material, wherein an outer edge of an upper end surface of the at least one support part includes the first lower-die edge;
the upper die comprising a frame-shaped part configured to surround the first lower-die edge, wherein an inner edge of a lower end surface of the frame-shaped part includes the first upper-die edge;
the lower die further comprising a third lower-die edge extending so as to surround the first lower-die edge;
the upper die further comprising a third upper-die edge configured to extend along an extension direction of the third lower-die edge; and
the second upper-die edges protruding vertically downward and being configured to be inserted into a clearance between the first lower-die edge and the third lower-die edge as the second upper-die edges segment the frame-shaped offcut as the second upper-die edges pass the second lower-die edges.

2. The cutting device according to claim 1 , wherein:
the lower die has a plurality of bridges each extending in a direction intersecting an extension direction of the first lower-die edge and located vertically below the first lower-die edge, and an outer peripheral part surrounding the at least one support part;
side edges, facing each other, of upper end surfaces of a pair of the bridges facing each other in the extension direction of the first lower-die edge include the second lower-die edges;
an inner edge of an upper end surface of the outer peripheral part includes the third lower-die edge;
the frame-shaped part includes a main body and protrusible parts;
an outer edge of the lower end surface of the frame-shaped part includes the third upper-die edge; and
the protrusible parts are provided so as to be protrusible to be vertically below the main body, and are each configured to be inserted between the pair of the bridges that are facing each other, each of the protrusible parts including a lower end surface having opposite end edges, with both end edges intersecting an extension direction of the first upper-die edge and the third upper-die edge, and the opposite end edges forming the second upper-die edges.

3. The cutting device according to claim 2 , wherein:
the at least one support part comprises a plurality of support parts;
the lower die has the plurality of support parts arrayed in one direction orthogonal to a relative movement direction of the upper die and the lower die; and
the bridges each extend along the one direction from a side surface of one or more of the support parts intersecting the one direction.

4. The cutting device according to claim 3 , wherein the lower die has two of the bridges extending from the side surface of one of the support parts, at an interval in the extension direction of the first lower-die edge extending along the side surface.

5. The cutting device according to claim 4 , wherein a recess is defined in the one of the side surface of the support parts, vertically above the bridges.

6. The cutting device according to claim 1 , wherein:
the upper die includes, on an inner side of the frame-shaped part, a guide that guides movement of the frame-shaped part, the sheet material being sandwiched between the guide and the at least one support part of the lower die; and
the guide has a raised portion that is provided at a peripheral edge of a lower end surface of the guide and the raised portion protrudes vertically downward.

7. A sheet material manufacturing method of cutting a sheet material out of a sheet base material by shearing, the method comprising:
punching out the sheet material using a lower die and an upper die that are movable relative to each other, by shearing the sheet base material between a first lower-die edge extending along an outline shape of the sheet material and a first upper-die edge extending along the first lower-die edge;
in the punching out of the sheet material, shearing and segmenting a frame-shaped offcut of the sheet base material that is left behind after the sheet material is punched out, between a plurality of second upper-die edges and a plurality of second lower-die edges that is provided vertically below the first lower-die edge, by protruding the second upper-die edges to be vertically below the second lower-die edges; and
inserting the second upper-die edges into a clearance between the first lower-die edge and a third lower-die edge extending so as to surround the first lower-die edge as a third upper-die edge extending along the third lower-die edge enters the clearance and the second upper-die edges segment the frame-shaped offcut as the second upper-die edges pass the second lower-die edges.

8. The sheet material manufacturing method according to claim 7 , wherein:
in the punching out of the sheet material, a wall surface extending vertically downward from the third lower-die edge guides a wall surface extending vertically upward from the third upper-die edge that extends along the third lower-die edge.

Assignees

• Toyota Motor Co Ltd

Inventors

• Hori Yoshihiro
• Ueyama Yasuyuki

Classifications

• B21D28/14

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

• B21D28/02 Primary

  Punching blanks or articles with or without obtaining scrap (cutting nails or pins from strips or sheet material B21G3/26); Notching · CPC title

• B26F1/44 Primary

  Cutters therefor; Dies therefor · CPC title

• B21D28/26 Primary

  in sheets or flat parts · CPC title

• B26F2210/02

  of stacked sheets · CPC title