Punch of punching press, nibbler assembly, and method of forming elongated hole in sheet material

Patent metadata

Field	Value
Publication number	US-9381559-B2
Application number	US-201113997362-A
Country	US
Kind code	B2
Filing date	Nov 16, 2011
Priority date	Jan 7, 2011
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A punch includes first and second blade sections juxtaposed relative to each other in a direction parallel or substantially parallel to a feed direction of a sheet material. The first blade section protrudes downwardly from the second blade section with a step intervening therebetween and includes lower end edges on downstream and upstream sides of the feed direction, which define respective punching edges. The first blade section includes a lower end edge following the feed direction, which defines a first notching and punching edge. The notching and punching edge includes a portion intermediate of the feed direction representing a projecting shape. The second blade section includes a lower end edge on the upstream side, which defines a punching edge and also includes a lower end edge following the feed direction, which defines a notching and punching edge. The notching and punching edge is inclined gradually upwardly towards the upstream side.

First claim

What is claimed is:

1. A punch for a punching press capable of performing a nibbling operation on a sheet material while the sheet material is fed in a feed direction, the punch comprising:
a first blade section and a second blade section juxtaposed relative to each other on a punch lower surface in a direction parallel or substantially parallel to the feed direction of the sheet material;
an upstream side end surface and a downstream side end surface that each include a plane surface perpendicular to the feed direction; and
a pair of side surfaces that each include a plane surface extending in the feed direction and the vertical direction; wherein
a recess is defined between the first blade section and the second blade section at the punch lower surface, the first blade section being located on a downstream side of the recess with respect to the feed direction and the second blade section being located on an upstream side of the recess with respect to the feed direction;
the first blade section extends downwardly of the second blade section, and includes a first bottom surface including a downstream end edge, an upstream end edge, and a pair of first side edges;
the first bottom surface has a protruding shape which extends at an incline downwardly from the upstream end edge in the feed direction to a lowest end of the punch, and further extends such that the protruding shape is inclined upwardly from the lowest end to the downstream end edge in the feed direction;
the upstream end edge and the downstream end edge define a punching edge, and the pair of first side edges define a notching and punching edge;
the second blade section includes a second bottom surface including an upstream end edge, a downstream end edge, and a pair of second side edges;
the second bottom surface has an inclined shape which extends at an incline downwardly from the upstream end edge to the downstream end edge in the feed direction; and
the upstream end edge defines a punching edge, and the pair of second side edges defines a notching and punching edge.

2. A nibbler assembly for a punching press comprising:
the punch according to claim 1 ; and
a die; wherein
the die is partitioned by a partition wall into downstream and upstream sides with respect to the feed direction of the sheet material and includes first and second throughholes defined on the downstream and upstream sides, respectively, the first and second blade sections of the punch being arranged to enter the first and second throughholes, respectively;
the first throughhole includes inner wall surfaces including wall surface portions on the downstream and upstream sides with respect to the feed direction of the sheet material that define die side punching edges engageable with the punching edge of the first blade section on the downstream and upstream sides of the first blade section and an upper end edge of a wall surface portion following the feed direction of the sheet material defining a die side notching and punching edge engageable with the notching and punching edge of the first blade section; and
the second throughhole includes inner wall surfaces, an upper end edge of a wall surface portion on the upstream side with respect to the feed direction of the sheet material defining a die side punching edge engageable with the punching edge of the second blade section and an upper end edge of a wall surface portion parallel or substantially parallel to the feed direction of the sheet material defining a die side notching and punching edge engageable with the notching and punching edge of the second blade section.

3. The nibbler assembly for the punching press as claimed in claim 2 , wherein in the first throughhole, the wall surface portion defining the die side punching edge engageable with the punching edge on the downstream side includes an upper end edge lower than the wall surface portion defining the die side notching and punching edge engageable with the notching and punching edge, and a downstream side cutout, which includes an upper surface of a height lower than any other section of the wall surface portion defining the die side punching edge, is defined by the wall surface portion, including such a low upper end edge thereof, towards the downstream side; and
in the second throughhole, the wall surface portion defining the die side punching edge engageable with the punching edge includes an upper end edge lower than the wall surface portion defining the die side notching and punching edge engageable with the notching and punching edge and an upstream side cutout, which includes an upper surface of a height lower than any other section of the wall surface portion defining the die side punching edge, is defined by the wall surface portion, including such a low upper end edge thereof, towards the upstream side.

Assignees

• Matsumura Kohei
• Murata Machinery Ltd

Inventors

• Matsumura Kohei

Classifications

• 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

• Y10T83/9418

  Punching plus nonpunching tool · CPC title

• Y10T83/0524

  Plural cutting steps · CPC title

• B21D28/10

  Incompletely punching in such a manner that the parts are still coherent with the work · CPC title

• B21D28/16

  Shoulder or burr prevention {, e.g. fine-blanking} · CPC title