Method for manufacturing a nut by the progressive press forging of a laminar metal sheet and resulting nut

Patent metadata

Field	Value
Publication number	US-2016010678-A1
Application number	US-201414769874-A
Country	US
Kind code	A1
Filing date	Feb 20, 2014
Priority date	Feb 28, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

METHOD FOR MANUFACTURING A NUT BY THE PROGRESSIVE PRESS FORGING OF A LAMINAR METAL SHEET AND RESULTING NUT, in which said method comprises the steps of:
producing a piece with a supporting washer, a dome and an emergent hexagonal part by press forging starting from a laminar metal sheet of material of suitable thickness, said piece being of uniform thickness; and creating a threaded internal cylinder by progressive press forging of the interior of said hexagonal emergent part, displacing material laterally from the central zones of said faces to the zones of the angles, heat treating the piece obtained, treatment intended to provide the piece with greater strength, especially a yield strength Rp 0.2% of approximately 1200 MPa and a tensile strength Rm of approximately 1400 MPa.

First claim

1 . A METHOD FOR MANUFACTURING A NUT BY THE PROGRESSIVE PRESS FORGING OF A LAMINAR METAL SHEET AND RESULTING NUT, of the type of nut incorporating a supporting base and an external hexagonal profile for the application of a tightening tool, wherein said method comprises the steps of:
starting from a laminar metal sheet of suitable material and thickness, producing a piece with a supporting washer and an emergent hexagonal part by press forging, said part being of uniform thickness; and creating a threaded interior through progressive press forging in the interior of said hexagonal emergent part, displacing material laterally from the central zones of said faces into the zones of the edges; applying heat treatment to the piece obtained, treatment intended to provide the piece with greater strength.

2 . THE METHOD FOR MANUFACTURING A NUT BY THE PROGRESSIVE PRESS FORGING OF A LAMINAR METAL SHEET AND RESULTING NUT as claimed in claim 1 , wherein said press forging produces an approximately hemispherical junction zone between said supporting washer and said emergent part, in the manner of a dome.

3 . THE METHOD FOR MANUFACTURING A NUT BY THE PROGRESSIVE PRESS FORGING OF A LAMINAR METAL SHEET AND RESULTING NUT as claimed in claim 1 , wherein said treatment of the carbon steel results in a piece having a yield strength Rp 0.2% of approximately 1200 MPa and a tensile strength Rm of approximately 1400 MPa.

4 . A NUT, of the type incorporating a supporting base and an outer hexagonal profile for the application of a tool, produced by the method as claimed in claim 1 , wherein it has an emergent part which ends in a supporting washer without any discontinuity; said emergent part has an exterior forming a hexagon, that is having six faces, while there is a threaded interior within it.

5 . THE NUT, as claimed in claim 4 , wherein there is an approximately hemispherical part of the dome type at the join between said supporting washer and said emergent part.

6 . THE NUT, as claimed in claim 4 , wherein it is made of a strengthened material, such as a technically treated carbon steel, having a yield strength Rp 0.2% of approximately 1200 MPa and a tensile strength Rm of approximately 1400 MPa.

7 . THE NUT, as claimed in claim 6 , wherein it is of uniform thickness, specifically that of the laminar sheet or strip from which it is formed, except in said emergent part where the process of progressive press forging has given rise to the internal threaded portion and has established that the thickness of this emergent part is in relation to its relative position with respect to the centers of said faces.

Assignees

• Illinois Tool Works

Inventors

• Ortega Dona Raul

Classifications

• B21K1/64 Primary

  nuts (making screw-thread B21K1/56) · CPC title

• F16B37/00 Primary

  Nuts or like thread-engaging members {(specially shaped for rotations by a tool F16B23/00)} · CPC title

• F16B37/02

  made of thin sheet material (fastening to surfaces F16B37/04 {; used as lock-nuts F16B39/14}) · CPC title

• B21D53/24 Primary

  nuts or like thread-engaging members · CPC title