Systems and methods for electroprocessing a gun barrel using a moving electrode

Patent metadata

Field	Value
Publication number	US-10870140-B2
Application number	US-201916385790-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	Apr 17, 2018
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A guide system for use in electro-processing a bore of a gun barrel includes a non-conductive external bore guide and a non-conductive internal bore guide. The external bore guide is an adapter that is configured to removably engage the outside of the gun barrel and includes a conduit formed therein. The conduit is disposed such that it is axially aligned with a bore of the gun barrel when the external bore guide is engaged with the gun barrel. The internal bore guide is elongated and includes an axial recess that is sized to seat an electro-processing electrode (an anode). A method for uniformly plating the bore includes moving an anode through the gun barrel at one or more rate(s) of travel to uniformly plate the bore is also disclosed. The plating is sufficiently uniform to conform to military specifications. The systems, methods, support structures, etc. described herein are particularly well-suited to plating small-bore gun barrels.

First claim

What is claimed is:

1. A method for electro-processing a bore of a gun barrel, said method comprising:
providing a gun barrel having a bore defining an axis;
providing an electrode having a lead electrically coupled thereto, a length of said electrode being less than a length of said bore;
providing a barrel end adapter defining a conduit therethrough;
temporarily affixing said barrel end adapter to a first end of said gun barrel such that said conduit is axially aligned with said bore;
positioning said electrode within said bore;
positioning said gun barrel in electro-processing solution;
moving said electrode within at least one of said bore and said conduit; and
applying process current via said electrode during said step of moving said electrode to cause electro-processing of said bore.

2. The method of claim 1 , wherein:
said barrel end adapter is threaded; and
said step of affixing said barrel end adapter on said gun barrel comprises screwing said barrel end adapter onto complementary threads of said gun barrel.

3. The method of claim 1 , wherein said step of positioning said electrode within said bore comprises passing said lead through said bore and said conduit.

4. The method of claim 3 , wherein said step of applying said process current results in said bore being electroplated.

5. The method of claim 3 , wherein:
said step of providing said electrode comprises providing an electrode having a bore guide coupled thereto; and
said step of positioning said electrode within said bore further includes positioning said bore guide within said bore.

6. The method of claim 5 , wherein said step of providing said electrode having said bore guide coupled thereto comprises affixing said bore guide to said electrode prior to said step of positioning said electrode within said bore.

7. The method of claim 6 , wherein:
said bore guide comprises a passage formed therein; and
said step of affixing said bore guide to said electrode comprises positioning said electrode and said lead within said passage.

8. The method of claim 1 , further comprising determining an amount of electro-processing to be applied to said bore by measuring a diameter of said bore.

9. The method of claim 8 , wherein said step of moving said electrode includes controlling the rate at which said electrode is moved within said bore based on said amount of electro-processing to be applied to said bore.

10. The method of claim 1 , further comprising:
moving said electrode at a first rate within a first region of said bore; and
moving said electrode at a second rate within a second region of said bore, said second rate being slower than said first rate.

11. The method of claim 10 , wherein:
said step of applying said process current causes said bore to be electroplated; and
plating applied to said bore in said second region is thicker than plating applied to said bore in said first region.

12. The method of claim 11 , wherein said second region is located near a muzzle end of said gun barrel.

13. The method of claim 1 , further comprising:
providing a non-conductive processing shield configured to cover a portion of said gun barrel to prevent electro-processing of said covered portion; and
positioning said processing shield within said gun barrel.

14. The method of claim 13 , wherein:
said gun barrel comprises a barrel extension affixed to a second end thereof; and
said step of positioning said processing shield within said gun barrel comprises covering an inner surface of said barrel extension with said processing shield.

15. The method of claim 1 , further comprising:
providing a second gun barrel having a bore defining an axis;
providing a second electrode having a lead electrically coupled thereto, a length of said second electrode being less than a length of said bore of said second gun barrel;
providing a second barrel end adapter defining a conduit therethrough;
affixing said second barrel end adapter to a first end of said second gun barrel such that said conduit of said second barrel end adapter is axially aligned with said axis of said bore of said second gun barrel;
positioning said second electrode within said bore of said second gun barrel;
positioning said second gun barrel in said electro-processing solution;
moving said second electrode within said bore of said second gun barrel and said conduit of said second barrel end adapter; and
applying second process current on said second electrode during said step of moving said second electrode to cause electro-processing of said bore of said second gun barrel.

16. The method of claim 15 , wherein said step of moving said electrode and moving said second electrode comprises moving said electrode and said second electrode at different rates.

17. The method of claim 15 , wherein said process current and said second process current facilitate equal current densities.

18. The method of claim 1 , wherein said step of moving said electrode within at least one of said bore and said conduit comprises rotating said electrode as said electrode moves within said bore.

Assignees

• Government Of The United States As Represented By The Secretary Of The Army

Inventors

• Pingilley John D
• Badger Amanda L
• Phipps Dale A

Classifications

• F41A21/04 Primary

  Barrel liners · CPC title

• B21C37/152 Primary

  Making rifle or gun barrels · CPC title

• C25D7/00

  Electroplating characterised by the article coated · CPC title

• C25D21/12

  Process control or regulation (controlling or regulating in general G05) · CPC title

• C25D5/04

  Electroplating with moving electrodes · CPC title