EP2964406B1 - Method for producing a gun barrel having barrel flutings - Google Patents

Method for producing a gun barrel having barrel flutings Download PDF

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Publication number
EP2964406B1
EP2964406B1 EP14707312.6A EP14707312A EP2964406B1 EP 2964406 B1 EP2964406 B1 EP 2964406B1 EP 14707312 A EP14707312 A EP 14707312A EP 2964406 B1 EP2964406 B1 EP 2964406B1
Authority
EP
European Patent Office
Prior art keywords
forging
barrel
blank
ribs
hammers
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP14707312.6A
Other languages
German (de)
French (fr)
Other versions
EP2964406A1 (en
Inventor
Michael Engesser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Steyr Mannlicher GmbH
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Steyr Mannlicher GmbH
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 Steyr Mannlicher GmbH filed Critical Steyr Mannlicher GmbH
Publication of EP2964406A1 publication Critical patent/EP2964406A1/en
Application granted granted Critical
Publication of EP2964406B1 publication Critical patent/EP2964406B1/en
Priority to HRP20161589TT priority Critical patent/HRP20161589T1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/02—Special design or construction
    • B21J7/14—Forging machines working with several hammers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/066—Making machine elements axles or shafts splined
    • 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
    • F41A21/24—Barrels or gun tubes with fins or ribs, e.g. for cooling

Definitions

  • the present invention relates to a method of making a run with troughs.
  • the barrel is often provided with so-called troughs, which are distributed over the circumference of the barrel, running in the longitudinal direction of the barrel grooves (see, eg DE 16299 C ).
  • troughs which are distributed over the circumference of the barrel, running in the longitudinal direction of the barrel grooves.
  • the troughs can be made by a separate forging step instead of a separate milling step, which is also expensive.
  • the invention has for its object to provide a method for producing a run with troughs, which overcomes the disadvantages of the prior art.
  • forging hammers are used, each with one to four ribs, which ribs are regularly distributed over the circumference of the blank in order to achieve a good compromise between weight savings and strength depending on the caliber.
  • Fig. 1 shows a barrel 1 for a rifle or other firearm (not shown).
  • the barrel 1 is provided with a plurality of longitudinal grooves (troughs) 2 distributed over its circumference, which allow a reduction in weight while maintaining the desired rigidity, minimum wall thickness and vibration behavior of the barrel, as known to the person skilled in the art.
  • the longitudinal grooves 2 of the barrel 1 are made directly during the cold forging (hammering) of the barrel 1 in a hammer drill, of which in the FIGS. 2 and 3 only the forging hammers 3 - seen in a normal to the axial direction 4 of the barrel 1 section - are shown.
  • four forging hammers 3 are used, which are distributed over the circumference of the barrel 1 and act radially in the direction of the arrows 5 on the recorded between them run 1 or hammer.
  • the starting point is a cylindrical blank having an axial through-bore into which a forging mandrel (not shown) is inserted, whereupon the forging hammers 3 are hammered onto the blank in the area of the inserted hammersurge to make it run ,
  • the axial length of the forging hammers 3 is generally shorter than the length of the barrel 1, so that the forging hammers 3 and serving as an abutment Hämmerdorn be moved in the axial direction relative to the barrel 1.
  • the barrel 1 is moved in the axial direction 4 through the forging hammers 3 of the barrel hammer machine, while the hammer mandrel is held in the barrel in the region of the forging hammers 3 on a holding device, for example a holding rod.
  • the forging hammers 3 are provided with their ribs or barrels acting on the blank or barrel with ribs 6 parallel to the longitudinal axis 4 of the blank or barrel.
  • ribs 6 parallel to the longitudinal axis 4 of the blank or barrel.
  • Fig. 2 are per forging hammer 3 depending on a longitudinal rib 6 and in the embodiment of Fig. 3 per two hammer 3 per two longitudinal ribs 6 used.
  • the ribs 6 of all forging hammers 3 are distributed substantially regularly over the circumference of the blank or barrel 1.
  • the troughs or longitudinal grooves 2 are forged into the barrel 1 directly during the cold forging of the blank to run 1.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Herstellen eines Laufs mit Laufflutungen.The present invention relates to a method of making a run with troughs.

Um das Gewicht eines (Jagd-) Gewehres zu reduzieren, wird der Lauf häufig mit sogenannten Laufflutungen versehen, das sind über den Umfang des Laufs verteilte, in Längsrichtung des Laufs verlaufende Nuten (siehe z.B. DE 16299 C ). Dadurch werden trotz Gewichtsreduzierung die gewünschte Steifigkeit und die Mindestwandstärke des Laufs ohne negative Beeinflussung des Schwingungsverhaltens des Laufs bei der Schussabgabe erreicht.To reduce the weight of a (hunting) rifle, the barrel is often provided with so-called troughs, which are distributed over the circumference of the barrel, running in the longitudinal direction of the barrel grooves (see, eg DE 16299 C ). As a result, despite weight reduction, the desired rigidity and the minimum wall thickness of the barrel are achieved without negatively influencing the vibration behavior of the barrel during firing.

Solche Laufflutungen werden derzeit spanabhebend aufeinanderfolgend einzeln oder bestenfalls paarweise aus dem Lauf gefräst. Nachteilig daran sind der hohe Fertigungsaufwand und unterschiedliche Oberflächenrauigkeiten, welche auch zu einer verstärkten Schmutzanhaftung führen können.Such floods are currently machined consecutively individually or at best milled in pairs from the barrel. The disadvantage of this is the high production cost and different surface roughness, which can also lead to increased dirt adhesion.

In der DE 16299 C ist angegeben, dass die Laufflutungen statt durch einen gesonderten Frässchritt auch durch einen gesonderten Schmiedeschritt hergestellt werden können, was ebenfalls aufwendig ist.In the DE 16299 C is indicated that the troughs can be made by a separate forging step instead of a separate milling step, which is also expensive.

Aus der FR 2 755 042 A1 ist es auf dem Gebiet der Fahrzeugtechnik an sich bekannt, Längsnuten bzw. Rippen in Lenkachsen mittels Schmiedehämmern zu erzeugen.From the FR 2 755 042 A1 It is known per se in the field of vehicle technology to produce longitudinal grooves or ribs in steering axles by means of forging hammers.

Die Erfindung setzt sich zum Ziel, ein Verfahren zum Herstellen eines Laufs mit Laufflutungen zu schaffen, welches die Nachteile des Standes der Technik überwindet.The invention has for its object to provide a method for producing a run with troughs, which overcomes the disadvantages of the prior art.

Dieses Ziel wird mit einem Verfahren zum Herstellen eines Laufs durch Kaltschmieden eines zylindrischen Rohlings mit einer axialer Durchgangsbohrung, mit den Schritten:

  • Einführen eines Schmiededorns in die axiale Durchgangsbohrung des zylindrischen Rohlings;
  • Kaltschmieden des Laufs mittels einer Laufhämmermaschine, die mehrere über den Umfang des Rohlings verteilte, radial auf den Rohling im Bereich des eingeführten Schmiededorns einwirkende Schmiedehämmer hat; und
  • während des Kaltschmiedens, Schmieden von Längsnuten in den Rohling mittels der genannten Schmiedehämmer, welche zu diesem Zweck zur Längsachse des Rohlings parallele Rippen haben.
This object is achieved with a method of making a cold forging of a cylindrical blank having an axial throughbore, comprising the steps of:
  • Inserting a forging mandrel into the axial throughbore of the cylindrical blank;
  • Cold forging the barrel by means of a hammer drill having a plurality of over the circumference of the blank distributed, radially acting on the blank in the region of the inserted forging mandrel forging hammers; and
  • during cold forging, forging longitudinal grooves in the blank by means of said forging hammers, which for this purpose have ribs parallel to the longitudinal axis of the blank.

Durch das Mitschmieden der Laufflutungen bzw. Nuten direkt während des Kaltschmiedens ("Hämmern") des Laufs in der Laufhämmermaschine entfällt eine nachträgliche spanabhebende schmiedende Bearbeitung des Laufs, was eine bedeutende Fertigungsvereinfachung darstellt. Neben der Reduzierung der Herstellkosten werden überdies eine gleichmäßige Oberfläche, geringe Oberflächenrauigkeit und eine homogene Festigkeit des gesamten gefluteten Laufes über den Materialquerschnitt, insbesondere auch im Bereich der Laufflutungen, erreicht.By Mitschmieden the troughs or grooves directly during the cold forging ("hammering") of the barrel in the hammer mill eliminates subsequent machining forging of the barrel, which is a significant manufacturing simplification. In addition to reducing the production costs, moreover, a uniform surface, low surface roughness and a homogeneous strength of the entire flooded barrel over the material cross section, in particular also in the region of the troughs, are achieved.

Bevorzugt werden vier Schmiedehämmer mit je ein bis vier Rippen verwendet, welche Rippen regelmäßig über den Umfang des Rohlings verteilt sind, um je nach Kaliber einen guten Kompromiss zwischen Gewichtseinsparung und Festigkeit zu erzielen.Preferably, four forging hammers are used, each with one to four ribs, which ribs are regularly distributed over the circumference of the blank in order to achieve a good compromise between weight savings and strength depending on the caliber.

Die Erfindung wird nachstehend anhand eines in den beigeschlossenen Zeichnungen dargestellten Ausführungsbeispiels näher erläutert. In den Zeichnungen zeigen:

  • Fig. 1 einen mit Laufflutungen versehenen Lauf in einer Perspektivansicht; und
  • die Fig. 2 und 3 verschiedene Ausführungsformen von Schmiedehämmern einer Laufhämmermaschine in einem axial normalen Schnitt zur Durchführung des Verfahrens der Erfindung.
The invention will be explained in more detail with reference to an embodiment shown in the accompanying drawings. In the drawings show:
  • Fig. 1 a troughed barrel in a perspective view; and
  • the FIGS. 2 and 3 various embodiments of forging hammers of a hammer drill in an axially normal section for carrying out the method of the invention.

Fig. 1 zeigt einen Lauf 1 für ein Gewehr oder sonstige Feuerwaffe (nicht dargestellt). Der Lauf 1 ist mit mehreren über seinen Umfang verteilten Längsnuten (Laufflutungen) 2 versehen, welche unter Einhaltung der gewünschten Steifigkeit, Mindestwandstärke und Schwingungsverhalten des Laufs eine Gewichtsreduzierung ermöglichen, wie dem Fachmann bekannt. Fig. 1 shows a barrel 1 for a rifle or other firearm (not shown). The barrel 1 is provided with a plurality of longitudinal grooves (troughs) 2 distributed over its circumference, which allow a reduction in weight while maintaining the desired rigidity, minimum wall thickness and vibration behavior of the barrel, as known to the person skilled in the art.

Die Längsnuten 2 des Laufs 1 werden direkt während des Kaltschmiedens (Hämmerns) des Laufs 1 in einer Laufhämmermaschine hergestellt, von welcher in den Fig. 2 und 3 lediglich die Schmiedehämmer 3 - in einem zur Axialrichtung 4 des Laufs 1 normalen Schnitt gesehen - dargestellt sind. Im gezeigten Beispiel werden vier Schmiedehämmer 3 verwendet, die über den Umfang des Laufs 1 verteilt sind und radial in Richtung der Pfeile 5 auf den zwischen ihnen aufgenommen Lauf 1 einwirken bzw. einhämmern.The longitudinal grooves 2 of the barrel 1 are made directly during the cold forging (hammering) of the barrel 1 in a hammer drill, of which in the FIGS. 2 and 3 only the forging hammers 3 - seen in a normal to the axial direction 4 of the barrel 1 section - are shown. In the example shown four forging hammers 3 are used, which are distributed over the circumference of the barrel 1 and act radially in the direction of the arrows 5 on the recorded between them run 1 or hammer.

Für das Kaltschmieden wird zunächst von einem zylindrischen Rohling mit einer axialen Durchgangsbohrung ausgegangen, in welche ein Schmiede- bzw. Hämmerdorn (nicht gezeigt) eingeführt wird, woraufhin die Schmiedehämmer 3 auf den Rohling im Bereich des eingeführten Hämmerdorns einhämmern, um diesen zum Lauf zu schmieden. Die Axiallänge der Schmiedehämmer 3 ist dabei in der Regel kürzer als die Länge des Laufs 1, so dass die Schmiedehämmer 3 und der darin als Gegenlager dienende Hämmerdorn in Axialrichtung relativ zum Lauf 1 bewegt werden. In der Praxis wird der Lauf 1 in Axialrichtung 4 durch die Schmiedehämmer 3 der Laufhämmermaschine hindurchbewegt, während der Hämmerdorn im Lauf im Bereich der Schmiedehämmer 3 an einer Haltevorrichtung, z.B. einer Haltestange, gehalten wird.For cold forging, the starting point is a cylindrical blank having an axial through-bore into which a forging mandrel (not shown) is inserted, whereupon the forging hammers 3 are hammered onto the blank in the area of the inserted hammersurge to make it run , The axial length of the forging hammers 3 is generally shorter than the length of the barrel 1, so that the forging hammers 3 and serving as an abutment Hämmerdorn be moved in the axial direction relative to the barrel 1. In practice, the barrel 1 is moved in the axial direction 4 through the forging hammers 3 of the barrel hammer machine, while the hammer mandrel is held in the barrel in the region of the forging hammers 3 on a holding device, for example a holding rod.

Für das vorliegende Verfahren werden die Schmiedehämmer 3 an ihren auf den Rohling bzw. den Lauf einwirkenden Hämmerflächen mit zur Längsachse 4 des Rohlings bzw. Laufs parallelen Rippen 6 ausgestattet. In dem Ausführungsbeispiel von Fig. 2 werden pro Schmiedehammer 3 je eine Längsrippe 6 und in dem Ausführungsbeispiel von Fig. 3 pro Schmiedehammer 3 je zwei Längsrippen 6 verwendet. Die Rippen 6 aller Schmiedehämmer 3 sind dabei im wesentlichen regelmäßig über den Umfang des Rohlings bzw. Laufs 1 verteilt.For the present method, the forging hammers 3 are provided with their ribs or barrels acting on the blank or barrel with ribs 6 parallel to the longitudinal axis 4 of the blank or barrel. In the embodiment of Fig. 2 are per forging hammer 3 depending on a longitudinal rib 6 and in the embodiment of Fig. 3 per two hammer 3 per two longitudinal ribs 6 used. The ribs 6 of all forging hammers 3 are distributed substantially regularly over the circumference of the blank or barrel 1.

Mit Hilfe der Rippen 6 werden direkt während des Kaltschmiedens des Rohlings zum Lauf 1 die Laufflutungen bzw. Längsnuten 2 in den Lauf 1 eingeschmiedet.With the help of the ribs 6, the troughs or longitudinal grooves 2 are forged into the barrel 1 directly during the cold forging of the blank to run 1.

Die Erfindung ist nicht auf die dargestellten Ausführungsformen beschränkt, sondern umfasst alle Varianten und Modifikationen, die in den Rahmen der angeschlossenen Ansprüche fallen.The invention is not limited to the illustrated embodiments, but includes all variants and modifications that fall within the scope of the appended claims.

Claims (2)

  1. A method for producing a gun barrel (1) by cold forging a cylindrical blank having an axial passage opening, comprising the steps:
    introducing a forging mandrel into the axial passage opening of the cylindrical blank;
    cold forging the gun barrel (1) by means of a gun barrel forging machine, which has a plurality of forging hammers (3), which are distributed around the circumference of the blank and act radially on the blank in the region of the inserted forging mandrel;
    characterized by forging longitudinal grooves (2) into the blank during the cold forging by means of said forging hammers (3), which have ribs that are parallel to the longitudinal axis (4) of the blank for this purpose.
  2. The method according to claim 1, characterized in that four forging hammers (3) are used, each of which has one to four ribs (6), wherein the ribs (6) are distributed regularly around the circumference of the blank.
EP14707312.6A 2013-03-07 2014-01-15 Method for producing a gun barrel having barrel flutings Not-in-force EP2964406B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
HRP20161589TT HRP20161589T1 (en) 2013-03-07 2016-11-29 Method for producing a gun barrel having barrel flutings

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50157/2013A AT514020B1 (en) 2013-03-07 2013-03-07 Method for producing a run with troughs
PCT/AT2014/050011 WO2014134645A1 (en) 2013-03-07 2014-01-15 Method for producing a gun barrel having barrel flutings

Publications (2)

Publication Number Publication Date
EP2964406A1 EP2964406A1 (en) 2016-01-13
EP2964406B1 true EP2964406B1 (en) 2016-10-05

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EP14707312.6A Not-in-force EP2964406B1 (en) 2013-03-07 2014-01-15 Method for producing a gun barrel having barrel flutings

Country Status (6)

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US (1) US9446440B2 (en)
EP (1) EP2964406B1 (en)
AT (1) AT514020B1 (en)
ES (1) ES2607177T3 (en)
HR (1) HRP20161589T1 (en)
WO (1) WO2014134645A1 (en)

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
US10451373B2 (en) * 2015-01-16 2019-10-22 ZEV Technologies, Inc. Firearm barrel
US9677838B2 (en) * 2015-09-16 2017-06-13 Robert T. Faxon Firearm barrel fluting of varied depth and/or width
CN106141053A (en) * 2016-08-30 2016-11-23 上海交通大学 Servo-drive small deformation radially precision forging device
US10627179B1 (en) * 2019-03-19 2020-04-21 The United States Of America As Represented By The Secretary Of The Army M4A1 helically fluted barrel
CN114178453B (en) * 2021-11-04 2023-08-18 大冶特殊钢有限公司 Radial forging method of high-alloy square billet

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Publication number Priority date Publication date Assignee Title
DE16299C (en) * P. MAUSER in Oberndorf a. Neckar, Württemberg New barrels for firearms
US2104319A (en) * 1934-02-10 1938-01-04 Remington Arms Co Inc Manufacture of rifled tubes
GB631438A (en) * 1947-09-03 1949-11-02 Samuel Smith Improvements in apparatus for making fluted drills, bits, taps, reamers and the like
US3228298A (en) * 1960-04-20 1966-01-11 Andrew J Grandy Rifle barrel
US3738044A (en) * 1970-10-09 1973-06-12 R Robinson Anti spin-kick firearm
US4043173A (en) * 1974-01-21 1977-08-23 Politechnika Warszawska Method of shaping the outer surfaces of objects consisting of deformable materials and device for the application of the method
DE3120230A1 (en) * 1981-05-21 1982-12-09 Carl Walther Gmbh, 7900 Ulm Barrel for small arms (hand-held firearms), especially sporting and hunting rifles
US4722216A (en) * 1982-02-08 1988-02-02 Grotnes Metalforming Systems, Inc. Radial forging method
FR2755042B1 (en) 1996-10-24 1998-12-24 Lemforder Nacam Sa PROCESS FOR OBTAINING SPLINES ON A TREE
US6324780B1 (en) * 1999-07-09 2001-12-04 E.R. Shaw, Inc. Fluted gun barrel
AT408852B (en) * 2000-06-23 2002-03-25 Gfm Beteiligungs & Man Gmbh METHOD FOR FORGING A METAL WORKPIECE
DE112006000619B4 (en) * 2005-03-23 2014-02-13 Bishop Innovation Ltd. Method for producing a steering rack
WO2007009267A1 (en) * 2005-07-15 2007-01-25 Ernst Grob Ag Method for producing internal and external toothings on thin-walled, cylindrical hollow parts
WO2009056848A1 (en) 2007-11-02 2009-05-07 Transmission Systems Limited Projectile weapons
EP2454553A4 (en) * 2009-07-17 2017-05-17 Carrel Innovations OY Method for producing a gun barrel, device for producing a gun barrel and a gun barrel
US8025003B1 (en) * 2009-10-14 2011-09-27 The United States Of America As Represented By The Secretary Of The Navy Fluted firearm barrel

Also Published As

Publication number Publication date
ES2607177T3 (en) 2017-03-29
EP2964406A1 (en) 2016-01-13
US9446440B2 (en) 2016-09-20
HRP20161589T1 (en) 2017-01-13
AT514020B1 (en) 2015-05-15
AT514020A1 (en) 2014-09-15
US20160016217A1 (en) 2016-01-21
WO2014134645A1 (en) 2014-09-12

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