WO2014033362A1 - Method for producing a cartridge chamber - Google Patents

Method for producing a cartridge chamber Download PDF

Info

Publication number
WO2014033362A1
WO2014033362A1 PCT/FI2013/050822 FI2013050822W WO2014033362A1 WO 2014033362 A1 WO2014033362 A1 WO 2014033362A1 FI 2013050822 W FI2013050822 W FI 2013050822W WO 2014033362 A1 WO2014033362 A1 WO 2014033362A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
cartridge chamber
barrel
produced
internal pressure
Prior art date
Application number
PCT/FI2013/050822
Other languages
French (fr)
Inventor
Eero Nenonen
Torolf Pelin
Original Assignee
Carrel Innovations Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrel Innovations Oy filed Critical Carrel Innovations Oy
Publication of WO2014033362A1 publication Critical patent/WO2014033362A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/12—Cartridge chambers; Chamber liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/152—Making rifle and gunbarrels
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • C21D7/12—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars by expanding tubular bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/02—Composite barrels, i.e. barrels having multiple layers, e.g. of different materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/10—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes shotgun barrels

Definitions

  • This invention relates to a method of manufacturing the cartridge chamber of a gun consisting of the same piece of metal as the barrel of the gun.
  • the barrels of guns, such as hunting rifles, and the cartridge chambers included in the barrels are manufactured using a very old method by
  • the aim of this invention is to provide a new type of method of manufacturing the cartridge chamber of a gun by shaping one end of the barrel pipe.
  • the method according to the invention is characterized in that, in a barrel blank consisting of a pipe, an internal pressure pushing the wall of the pipe outwards is created at the point where the cartridge chamber is to be located, whereby an expan- sion corresponding to the shape of a cartridge chamber is created in the pipe.
  • WO/201 1/012766 discloses a method of manufacturing a gun barrel wherein a thin- walled pipe blank is rolled against a mandrel to rifle the pipe. It is exactly this pipe blank that suits the present invention. Tests have shown that a .222 caliber (5.6 mm) pipe barrel is very well expandable, at the cartridge chamber, to have an inner di- ameter of approximately 9.5 mm.
  • the pipe barrel produced by this method is further equipped with an outer pipe that can be a rigid, stiffening and lightweight aluminum pipe, for example.
  • the dependent claims describe different embodiments of the invention.
  • the method uses a gun barrel blank produced by the manufacturing method dis- closed in WO/2011/012766.
  • a ready-rifled pipe blank intentionally unrifled at the point where the cartridge chamber is to be located.
  • An external mould is fitted at the cartridge chamber against which the metal pipe presses when it is pressed outwards and takes the shape of a cartridge chamber.
  • the pressing is caused by an internal pressure pushing the wall of the pipe outwards to provide the pipe with an expansion corresponding to the shape of a cartridge chamber.
  • the cartridge chamber is plugged and a high hydraulic pressure, of 3000 to 5000 bar, is led into it, resulting in an even force distribution that gives the cartridge chamber a uniform wall structure.
  • a reamer is used to finish the inner faces of the cartridge chamber.
  • the barrel blank consisting of a rifled pipe part and a cartridge chamber part is further equipped with a stiffening outer pipe fitted on the barrel blank and receiving the pressure discharges caused by shooting.
  • the outer pipe can be made of aluminum or some other suitable alloy, or of carbon or glass fiber, for example.
  • the barrel blank is cooled down to -70° using carbonic acid, for example, and the outer pipe is heated up to 150 to 200°, before joining them, to make the pipes press together when at the same temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The invention relates to a method of manufacturing the cartridge chamber of a gun consisting of the same piece of metal as the barrel of the gun. In a barrel blank consisting of a pipe, an internal pressure pushing the pipe wall outwards is created at the point where the cartridge chamber is to be located, whereby an expansion corresponding to the shape of a cartridge chamber is created in the pipe.

Description

Method for producing a cartridge chamber
This invention relates to a method of manufacturing the cartridge chamber of a gun consisting of the same piece of metal as the barrel of the gun.
The barrels of guns, such as hunting rifles, and the cartridge chambers included in the barrels are manufactured using a very old method by
- drilling a hole in a shaft blank to form a pipe
- inserting a mandrel into the hole of the pipe and forging the wall of the pipe against the mandrel to provide the hole with gun barrel rifles
- checking and, if needed, correcting the straightness of the barrel
- drilling a cartridge chamber in one end of the pipe and finishing it with a reamer
- turning a barrel connector thread or bushing on the outer periphery of the car- tridge chamber
- giving a conical outer shape to the barrel by turning and, finally,
- dipping the barrel into an acid mixture to give it a bluish color.
The aim of this invention is to provide a new type of method of manufacturing the cartridge chamber of a gun by shaping one end of the barrel pipe.
The method according to the invention is characterized in that, in a barrel blank consisting of a pipe, an internal pressure pushing the wall of the pipe outwards is created at the point where the cartridge chamber is to be located, whereby an expan- sion corresponding to the shape of a cartridge chamber is created in the pipe.
WO/201 1/012766 discloses a method of manufacturing a gun barrel wherein a thin- walled pipe blank is rolled against a mandrel to rifle the pipe. It is exactly this pipe blank that suits the present invention. Tests have shown that a .222 caliber (5.6 mm) pipe barrel is very well expandable, at the cartridge chamber, to have an inner di- ameter of approximately 9.5 mm. The pipe barrel produced by this method is further equipped with an outer pipe that can be a rigid, stiffening and lightweight aluminum pipe, for example. The dependent claims describe different embodiments of the invention.
The invention will be explained in the following by means of an example.
The method uses a gun barrel blank produced by the manufacturing method dis- closed in WO/2011/012766. In other words, we have a ready-rifled pipe blank, intentionally unrifled at the point where the cartridge chamber is to be located.
An external mould is fitted at the cartridge chamber against which the metal pipe presses when it is pressed outwards and takes the shape of a cartridge chamber.
The pressing is caused by an internal pressure pushing the wall of the pipe outwards to provide the pipe with an expansion corresponding to the shape of a cartridge chamber. The cartridge chamber is plugged and a high hydraulic pressure, of 3000 to 5000 bar, is led into it, resulting in an even force distribution that gives the cartridge chamber a uniform wall structure. After the pressing, a reamer is used to finish the inner faces of the cartridge chamber. The barrel blank consisting of a rifled pipe part and a cartridge chamber part is further equipped with a stiffening outer pipe fitted on the barrel blank and receiving the pressure discharges caused by shooting. The outer pipe can be made of aluminum or some other suitable alloy, or of carbon or glass fiber, for example. The barrel blank is cooled down to -70° using carbonic acid, for example, and the outer pipe is heated up to 150 to 200°, before joining them, to make the pipes press together when at the same temperature.

Claims

Claims
1. A method of manufacturing the cartridge chamber of a gun consisting of the same piece of metal as the barrel of the gun, characterized in that, in a barrel blank con- sisting of a pipe, an internal pressure pushing the pipe wall outwards is created at the point where the cartridge chamber is to be located, whereby an expansion corresponding to the shape of a cartridge chamber is created in the pipe.
2. A method as defined in claim 1, characterized in that an external mould is fitted at the cartridge chamber against which the metal pipe presses when it is pressed outwards and takes the shape of a cartridge chamber.
3. A method as defined in claim 1 or 2, characterized in that, after the pressing, a reamer is used to finish the inner faces of the cartridge chamber.
4. A method as defined in claim 1, 2 or 3, characterized in that the internal pressure is produced by an explosive forming method.
5. A method as defined in claim 1, 2 or 3, characterized in that the internal pres- sure is produced by a hydraulic pressure method.
6. A method as defined in claim 1, 2 or 3, characterized in that the internal pressure is produced by a metallic mandrel, by pressing inside the pipe.
7. A method as defined in claim 1, 2 or 3, characterized in that the internal pressure is produced by an electric impulse or magnetic forming method.
8. A method as defined in any of the preceding claims, characterized in that the barrel blank consisting of a rifled pipe part and a cartridge chamber part is further equipped with a stiffening outer pipe fitted on the barrel blank and receiving the pressure discharges caused by shooting.
9. A method as defined in claim 8, characterized in that the outer pipe is made of aluminum.
10. A method as defined in claim 8 or 9, characterized in that the barrel blank is cooled down to -70° using carbonic acid, for example, and the outer pipe is heated up to 150 to 200°, before joining them, to make the pipes press together when at the same temperature.
PCT/FI2013/050822 2012-08-29 2013-08-26 Method for producing a cartridge chamber WO2014033362A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20125892 2012-08-29
FI20125892A FI20125892A (en) 2012-08-29 2012-08-29 Procedure for making cartridge nest for weapons

Publications (1)

Publication Number Publication Date
WO2014033362A1 true WO2014033362A1 (en) 2014-03-06

Family

ID=50182577

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2013/050822 WO2014033362A1 (en) 2012-08-29 2013-08-26 Method for producing a cartridge chamber

Country Status (2)

Country Link
FI (1) FI20125892A (en)
WO (1) WO2014033362A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3999799A4 (en) * 2019-07-16 2023-07-26 True Velocity IP Holdings, LLC Polymer ammunition having an alignment aid, cartridge and method of making the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2901814A (en) * 1956-04-02 1959-09-01 George C Sullivan Method of manufacturing gun barrels
FR1557440A (en) * 1968-03-22 1969-02-14
DE2559239A1 (en) * 1975-12-30 1977-07-14 Fritz Werner Ind Ausruestung Gun cartridge chamber with non jamming section - has chamber walls slightly tapered with helical pattern riflings to take up firing expansion
US4359810A (en) * 1980-01-16 1982-11-23 The Marlin Firearms Company Method of forming cartridge chambers in firearm barrels
US6931776B2 (en) * 2002-07-26 2005-08-23 Rheinmetall W&M Gmbh Apparatus for the section-wise autofrettage of gun barrels

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2901814A (en) * 1956-04-02 1959-09-01 George C Sullivan Method of manufacturing gun barrels
FR1557440A (en) * 1968-03-22 1969-02-14
DE2559239A1 (en) * 1975-12-30 1977-07-14 Fritz Werner Ind Ausruestung Gun cartridge chamber with non jamming section - has chamber walls slightly tapered with helical pattern riflings to take up firing expansion
US4359810A (en) * 1980-01-16 1982-11-23 The Marlin Firearms Company Method of forming cartridge chambers in firearm barrels
US6931776B2 (en) * 2002-07-26 2005-08-23 Rheinmetall W&M Gmbh Apparatus for the section-wise autofrettage of gun barrels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3999799A4 (en) * 2019-07-16 2023-07-26 True Velocity IP Holdings, LLC Polymer ammunition having an alignment aid, cartridge and method of making the same

Also Published As

Publication number Publication date
FI20125892A (en) 2014-03-01

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