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US 8,904,911 B2Granted
Sleeve for a punch assembly
AssigneeTextron Innovations Inc.
InventorWilliam F. Nordlin
Life of this patent
Estimating the term…
Abstract
A punch assembly includes a punch, a sleeve, a draw stud and a die. The sleeve adds rigidity to the draw stud, thereby reducing elastic deflection of the draw stud, reducing bending moment on the draw stud, reducing punching force, and extending the punch, draw stud and die fatigue life. The sleeve also aids in axial alignment of the punch, die and workpiece with a pilot hole drilled through a workpiece.
Claims11
A punching assembly comprising:
- a punch having a punch body having a first end surface and a second end surface, a punch wall extending from said first end surface to a free end, said punch wall having a punch profile on said free end, and a threaded passageway extending through said punch body, said punch body having a thickness defined between said end surfaces;
- and
- a sleeve having a first threaded section having a diameter, a second section having a diameter and extending from said first threaded section, and a third unthreaded section having a diameter and extending from said second section, said first threaded section and said third unthreaded section having the same outer diameter, and said second section having an outer diameter which is slightly smaller than the outer diameter of the first and third sections, said first threaded section having a length which corresponds to the thickness of said punch body, and an axial passageway extending through said sections, wherein at least a portion of said passageway of said sleeve is threaded,
- wherein said punch is threaded onto said first threaded section such that said second and third sections extend from said first end surface of said punch, and said third section extends past said punch profile on said punch wall.
1 more element
A method of assembling a punching assembly comprising:
- providing a punch having a punch body having a first end surface and a second end surface, a punch wall extending from said first end surface to a free end, said punch wall having a punch profile on said free end, and a threaded passageway extending through said punch body, said punch body having a thickness defined between said end surfaces;
- and
- providing a sleeve having a first threaded section having a diameter, a second section having a diameter and extending from said first threaded section, and a third unthreaded section having a diameter and extending from said second section, said first threaded section and said third unthreaded section having the same outer diameter, and said second section having an outer diameter which is slightly smaller than the outer diameter of the first and third sections, said first threaded section having a length which corresponds to the thickness of said punch body, and an axial passageway extending through said sections, wherein at least a portion of said passageway of said sleeve is threaded,
- inserting said sleeve through said first end surface and threading said first threaded section with said passageway of said punch such that said second and third sections extend from said first end surface of said punch.
1 more element
Dependencies are inferred from the claim text.