# US 12,759,038 B2 · Method of manufacturing a high-pressure cartridge case

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- Number: US 12,759,038 B2
- Document ID: US12759038B2
- Status: Granted
- Kind: B2
- Application number: 19/073,282
- Filed: 2025-03-07
- Published: 2025-07-31
- Granted: 2026-10-13
- Earliest claimed: 2020-09-25
- Assignees: Luvata Ohio, Inc.
- Applicants: Luvata Ohio Inc.
- Inventors: Brian Swank
- Web page: https://patentgrep.com/patent/US12759038B2

## CPC

- B21K 21/04: Shaping thin-walled hollow articles, e.g. cartridges
- C21D 7/02: by cold working
- C21D 8/06: during manufacturing of rods or wires
- C21D 9/16: for explosive shells
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- F42B 5/28: of metal {, i.e. the cartridge-case tube is of metal}
- F42B 5/295: coated
- B21K: MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS (making particular articles by working sheet metal without essentially removing material B21D; processing wire B21F; making pins, needles or nails B21G; making particular articles by rolling B21H; forging machines, pressing machines, hammering machines, in general B21J; making chains B21L; plating B23K)
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)

## Abstract

A high pressure cartridge case is fabricated by: providing a wire or rod; cold forming a cartridge case into a drawn blank or a tubular component from sheared lengths of the wire or rod; annealing the cartridge case using a belt furnace, flame furnace, induction furnace, or a batch furnace; performing a machine ejector slot and trim on the cartridge case; forming the shoulder and neck of the cartridge case; performing a heat treatment of the cartridge case; and tempering the cartridge case.

## Claims

### Claim 1

A method comprising:
providing a wire or rod;
cold forming a cartridge case into a drawn blank or a tubular component from sheared lengths of the wire or rod;
annealing the cartridge case using a belt furnace, flame furnace, induction furnace, or a batch furnace;
performing a machine ejector slot and trim on the cartridge case;
forming a shoulder and a neck of the cartridge case;
performing a heat treatment of the cartridge case; and
tempering the cartridge case;
wherein one or more of the following:
the wire or rod is spheroidized annealed at finished size (SAFS) before cold forming;
after performing the heat treatment and before tempering the cartridge case, the method further comprises oil quenching the cartridge case; or
the wire or rod comprises a precipitation-hardened copper alloy.

### Claim 2 (depends on 1)

The method of claim 1, wherein before cold forming the cartridge case, the method further comprises:
coating the wire or rod with a phosphorus and polymer coating.

### Claim 3 (depends on 1)

The method of claim 1, wherein the method further comprises:
coating the cartridge case with a corrosion resistant plating.

### Claim 4 (depends on 3)

The method of claim 3, wherein the corrosion resistant plating is a zinc plating, a nickel plating, a tin plating, a zinc-nickel plating, an electroless zinc plating, or an electroless nickel plating.

### Claim 5 (depends on 1)

The method of claim 1, wherein the precipitation-hardened copper alloy comprises CuZr, CuCrZr, or CuCr.

### Claim 6 (depends on 1)

The method of claim 1, wherein the wire or rod comprises a steel alloy.

### Claim 7 (depends on 6)

The method of claim 6, wherein the steel alloy comprises 300-series or 400-series stainless steel, 17-4 stainless steel, or 4000-series steel.

### Claim 8 (depends on 6)

The method of claim 6, wherein the steel alloy does not comprise boron steel.

### Claim 9 (depends on 1)

The method of claim 1, further comprising:
filling an interior volume of the cartridge case with a propellant.

### Claim 10 (depends on 9)

The method of claim 9, further comprising:
after firing the cartridge case from a weapon, re-filling the interior volume of the cartridge case with additional propellant.

### Claim 11 (depends on 1)

The method of claim 1, wherein the oil is drained from the cartridge case before tempering.