EP2964406A1 - Verfahren zum herstellen eines laufs mit laufflutungen - Google Patents

Verfahren zum herstellen eines laufs mit laufflutungen

Info

Publication number
EP2964406A1
EP2964406A1 EP14707312.6A EP14707312A EP2964406A1 EP 2964406 A1 EP2964406 A1 EP 2964406A1 EP 14707312 A EP14707312 A EP 14707312A EP 2964406 A1 EP2964406 A1 EP 2964406A1
Authority
EP
European Patent Office
Prior art keywords
barrel
blank
forging
hammers
ribs
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.)
Granted
Application number
EP14707312.6A
Other languages
English (en)
French (fr)
Other versions
EP2964406B1 (de
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
Original Assignee
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
Priority to HRP20161589TT priority Critical patent/HRP20161589T1/hr
Publication of EP2964406A1 publication Critical patent/EP2964406A1/de
Application granted granted Critical
Publication of EP2964406B1 publication Critical patent/EP2964406B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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 or gun barrels
    • 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.
  • troughs which are distributed over the circumference of the barrel, running in the longitudinal direction of the barrel grooves.
  • the invention has for its object to provide a method for producing a run with troughs, which overcomes these disadvantages.
  • a barrel manufacturing method based on cold forging a cylindrical blank in a barrel hammer machine having a plurality of forging hammers distributed radially around the blank, distributed over the circumference of the blank, which method is characterized in that forging hammers extend to the longitudinal axis of the blank parallel ribs are used to forge longitudinal grooves in the blank during cold forging.
  • a subsequent machining of the barrel is eliminated, which represents a significant manufacturing simplification.
  • a uniform surface, low surface roughness and a homogeneous strength of the entire flooded barrel over the material cross section are also 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.
  • Figure 1 is a provided with troughs run in a perspective view.
  • 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 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 or hammer radially in the direction of the arrows 5 onto the barrel 1 received between them.
  • 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 the hammer hammers serving as abutments therein mandrel are 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 per percussion hammer 3 each have a longitudinal rib 6 and in the embodiment of Fig. 3 per forging 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Forging (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Verfahren zum Herstellen eines Laufs (1) durch Kaltschmieden eines zylindrischen Rohlings in einer Laufhämmermaschine, die mehrere über den Umfang des Rohlings verteilte, radial auf den Rohling einwirkende Schmiedehämmer (3) hat, wobei, dass Schmiedehämmer (3) mit zur Längsachse (4) des Rohlings parallelen Rippen (6) verwendet werden, um während des Kaltschmiedens Längsnuten (2) in den Rohling zu schmieden.

Description

Verfahren zum Herstellen eines Laufs mit Laufflutungen
Die vorliegende Erfindung betrifft ein Verfahren zum Herstellen eines Laufs mit Laufflutungen .
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. Dadurch werden trotz Gewichtsreduzierung die gewünschte Steifigkeit und die Mindestwandstärke des Laufs ohne negative Beeinflussung des Schwingungsverhaltens des Laufs bei der Schussabgabe erreicht.
Solche Laufflutungen werden derzeit spanabhebend aufeinanderfolgend einzeln oder bestenfalls paarweise aus dem Lauf gefräst. Nachteilig daran sind der hohe Fertigungsaufwand und un- terschiedliche Oberflächenrauigkeiten, welche auch zu einer verstärkten Schmutzanhaftung führen können.
Die Erfindung setzt sich zum Ziel, ein Verfahren zum Herstellen eines Laufs mit Laufflutungen zu schaffen, welches diese Nachteile überwindet.
Dieses Ziel wird mit einem Laufherstellungsverfahren erreicht, das auf einem Kaltschmieden eines zylindrischen Rohlings in einer Laufhämmermaschine basiert, welche mehrere über den Umfang des Rohlings verteilte, radial auf den Rohling einwirkende Schmiedehämmer hat, welches Verfahren sich dadurch auszeichnet, dass Schmiedehämmer mit zur Längsachse des Rohlings parallelen Rippen verwendet werden, um während des Kaltschmiedens Längsnuten in den Rohling zu schmieden.
Durch das Mitschmieden der Laufflutungen bzw. Nuten direkt während des Kaltschmiedens („Hämmern") des Laufs entfällt eine nachträgliche spanabhebende 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 Materialquer- schnitt erreicht. 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 Kompro- miss zwischen Gewichtseinsparung und Festigkeit zu erzielen.
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.
Fig. 1 zeigt einen Lauf 1 für ein Gewehr oder sonstige Feuerwaffe (nicht dargestellt) . Der Lauf 1 ist mit mehreren ü- ber 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.
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 Um- fang des Laufs 1 verteilt sind und radial in Richtung der Pfeile 5 auf den zwischen ihnen aufgenommen Lauf 1 einwirken bzw. einhämmern .
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 Hämmer- dorn 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.
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.
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 .
Die Erfindung ist nicht auf die dargestellten Ausführungsformen beschränkt, sondern umfasst alle Varianten und Modifika- tionen, die in den Rahmen der angeschlossenen Ansprüche fallen.

Claims

Patentansprüche :
1. Verfahren zum Herstellen eines Laufs (1) durch Kaltschmieden eines zylindrischen Rohlings in einer Laufhämmerma- schine, die mehrere über den Umfang des Rohlings verteilte, radial auf den Rohling einwirkende Schmiedehämmer (3) hat, dadurch gekennzeichnet, dass Schmiedehämmer (3) mit zur Längsachse (4) des Rohlings parallelen Rippen (6) verwendet werden, um während des Kaltschmiedens Längsnuten (2) in den Rohling zu schmieden.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vier Schmiedehämmer (3) mit je ein bis vier Rippen (6) verwendet werden, welche Rippen (6) regelmäßig über den Umfang des Rohlings verteilt sind.
EP14707312.6A 2013-03-07 2014-01-15 Verfahren zum herstellen eines laufs mit laufflutungen Not-in-force EP2964406B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
HRP20161589TT HRP20161589T1 (hr) 2013-03-07 2014-01-15 Postupak proizvodnje puščane cijevi s užljebljenjem u cijevi

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50157/2013A AT514020B1 (de) 2013-03-07 2013-03-07 Verfahren zum Herstellen eines Laufs mit Laufflutungen
PCT/AT2014/050011 WO2014134645A1 (de) 2013-03-07 2014-01-15 Verfahren zum herstellen eines laufs mit laufflutungen

Publications (2)

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

Family

ID=50190125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14707312.6A Not-in-force EP2964406B1 (de) 2013-03-07 2014-01-15 Verfahren zum herstellen eines laufs mit laufflutungen

Country Status (6)

Country Link
US (1) US9446440B2 (de)
EP (1) EP2964406B1 (de)
AT (1) AT514020B1 (de)
ES (1) ES2607177T3 (de)
HR (1) HRP20161589T1 (de)
WO (1) WO2014134645A1 (de)

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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 (zh) * 2016-08-30 2016-11-23 上海交通大学 伺服驱动小变形径向精密锻造装置
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 (zh) * 2021-11-04 2023-08-18 大冶特殊钢有限公司 一种高合金方坯的径向锻造方法

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DE16299C (de) * P. MAUSER in Oberndorf a. Neckar, Württemberg Neuerungen an Läufen für Feuerwaffen
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
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DE3120230A1 (de) * 1981-05-21 1982-12-09 Carl Walther Gmbh, 7900 Ulm Lauf fuer handfeuerwaffen, insbesondere sport- und jagdgewehre
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FR2755042B1 (fr) 1996-10-24 1998-12-24 Lemforder Nacam Sa Procede d'obtention de cannelures sur un arbre
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Also Published As

Publication number Publication date
HRP20161589T1 (hr) 2017-01-13
EP2964406B1 (de) 2016-10-05
WO2014134645A1 (de) 2014-09-12
ES2607177T3 (es) 2017-03-29
US9446440B2 (en) 2016-09-20
US20160016217A1 (en) 2016-01-21
AT514020B1 (de) 2015-05-15
AT514020A1 (de) 2014-09-15

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