Fastening collar removal apparatus, methods of making a fastening collar removal apparatus, and methods of removing a fastening collar secured to a fastener

Patent metadata

Field	Value
Publication number	US-11628507-B2
Application number	US-201917420729-A
Country	US
Kind code	B2
Filing date	Feb 28, 2019
Priority date	Feb 28, 2019
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

Fastening collar removal apparatus, methods of making fastening collar removal apparatus, and methods of removing a fastening collar secured to a fastener are provided. A fastening collar removal apparatus includes a collet including a first section including a substantially cylindrical shape and a second section operatively coupled to the first section. The second section includes a collet cavity extending therein. The collet cavity is configured to receive at least a portion of a collar. The second section includes at least two fingers formed by at least two axial channels in the second section. At least one of the at least two fingers includes a blade extending inwardly relative to a longitudinal axis of the collet. In an open configuration of the collet, each of the at least two fingers includes an outward taper relative to a longitudinal axis of the collet.

First claim

What is claimed is:

1. A method of making a fastening collar removal apparatus comprising:
forming a collet in a closed configuration, the collet comprising:
a first section comprising a substantially cylindrical shape; and
a second section operatively coupled to the first section, the second section comprising:
a collet cavity extending therein, wherein the collet cavity is configured to receive at least a portion of a fastening collar secured to a fastener; and
at least two fingers formed by at least two axial channels in the second section, wherein at least one of the at least two fingers comprises a blade extending inwardly relative to a longitudinal axis of the collet;

inserting a fixture into the collet cavity to spread apart the fingers, thereby changing the closed configuration of the collet to an open configuration, wherein in the open configuration each of the at least two fingers comprises an outward taper relative to a longitudinal axis of the collet;
heat treating the collet in the open configuration to create a heat-treated collet; and
removing the fixture from the heat-treated collet.

2. The method of claim 1 , further comprising:
forming an anvil comprising a first end, a second end, and an anvil cavity extending into the anvil from the first end and configured to receive the collet, wherein the anvil is configured to decrease the outward taper of the at least two fingers responsive to forcible contact between the first end of the anvil and the second section of the collet.

3. The method of claim 2 , further comprising introducing the heat-treated collet into the anvil cavity.

4. The method claim 1 , wherein the collet comprises at least three fingers formed by at least three axial channels in the second section.

5. The method of claim 4 , wherein the three fingers are substantially equally spaced around a circumference of the collet.

6. The method of claim 4 , wherein each finger comprises a blade extending inward relative to the longitudinal axis of the collet.

7. The method of claim 1 , wherein forming the collet comprises at least one of machining, casting, molding, and additively manufacturing.

8. A method for removing a fastening collar secured to a fastener comprising:
positioning a collet cavity of a fastening collar removal apparatus around the fastening collar secured to the fastener, the fastening collar removal apparatus comprising:
a collet comprising:
a first section comprising a substantially cylindrical shape; and
a second section operatively coupled to the first section, the second section comprising:
a collet cavity extending therein, wherein the collet cavity is configured to receive at least a portion of the fastening collar; and
at least two fingers formed by at least two axial channels in the second section, wherein at least one of the at least two fingers comprises a blade extending inward relative to a longitudinal axis of the collet and the blade forming a cutting edge, wherein in an open configuration of the collet each of the at least two fingers comprises an outward taper relative to a longitudinal axis of the collet, wherein the at least two fingers are regions of a single piece of the second section; and

an anvil comprising:
a first end;
a second end;
a tapered inner surface disposed on the first end; and
an anvil cavity extending into the anvil from the first end and configured to receive the collet, the anvil configured to decrease the outward taper of the at least two fingers responsive to forcible contact between the tapered inner surface and the second section of the collet, wherein the tapered outer surface is tapered at an angle of 20 degrees to 40 degrees relative to the longitudinal axis of the collet;

after the positioning, forcibly contacting the second section of the collet with the first end of the anvil and thereby decreasing the taper of the at least two fingers; and
deforming the fastening collar by forcible contact with the blade on the at least one of the at least two fingers, thereby enabling removal of the fastening collar from the fastener.

9. The method of claim 8 , wherein the collet comprises at least three fingers formed by at least three axial channels in the second section.

10. The method of claim 8 , wherein the three fingers are substantially equally spaced around a circumference of the collet.

11. The method of claim 8 , wherein each finger comprises a blade extending inward relative to the longitudinal axis of the collet.

12. A fastening collar removal apparatus comprising:
a collet comprising:
a first section comprising a substantially cylindrical shape; and
a second section operatively coupled to the first section, the second section comprising:
a collet cavity extending therein, wherein the collet cavity is configured to receive at least a portion of a fastening collar secured to a fastener;
at least two fingers formed by at least two axial channels in the second section, wherein at least one of the at least two fingers comprises a blade extending inwardly relative to a longitudinal axis of the collet and the blade forming a cutting edge, wherein in an open configuration of the collet each of the at least two fingers comprises an outward taper relative to a longitudinal axis of the collet, and wherein the at least two fingers are regions of a single piece of the second section; and
a tapered outer surface disposed on the second section of the collet; and

an anvil comprising:
a first end;
a second end;
a tapered inner surface disposed on the first end; and
an anvil cavity extending into the anvil from the first end, the anvil cavity configured to receive the collet, the anvil configured to decrease the outward taper of the at least two fingers responsive to forcible contact between the tapered inner surface and the second section of the collet, wherein the tapered outer surface is tapered at an angle of 20 to 40 degrees relative to the longitudinal axis of the collet.

13. The fastening collar removal apparatus of claim 12 , wherein each finger comprises a blade extending inwardly relative to the longitudinal axis of the collet.

14. The fastening collar removal apparatus of claim 12 , comprising at least three fingers formed by at least three axial channels in the second section.

15. The fastening collar removal apparatus of claim 14 , wherein the three fingers are substantially equally spaced around a circumference of the collet.

16. The fastening collar removal apparatus of claim 12 , wherein each blade comprises two faces meeting at an angle in a range of 30 degrees to 90 degrees and the two faces forming a cutting edge.

17. The fastening collar removal apparatus of claim 16 , wherein each blade comprises two faces meeting at an angle in a range of 50 degrees to 60 degrees.

18. The fastening collar removal apparatus of claim 16 , wherein each cutting edge of each blade comprises a radius.

19. The fastening collar removal apparatus of claim 12 , wherein each blade is stepped.

20. The fastening collar removal apparatus of claim 12 , wherein the fastening collar removal apparatus comprises at least one of a metal, a metal alloy, and a composite material.

21. The fastening collar removal apparatus of claim 12 , wherein the collet is a single piece.

Assignees

• Howmet Aerospace Inc

Inventors

• Kingsbury Thomas R

Classifications

• B23D29/007 Primary

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