EP2964406B1 - Verfahren zum herstellen eines laufs mit laufflutungen - Google Patents
Verfahren zum herstellen eines laufs mit laufflutungen Download PDFInfo
- 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
Links
Images
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.
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)
Description
- 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 (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. - 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.
- 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. - Aus der
FR 2 755 042 A1 - Die Erfindung setzt sich zum Ziel, ein Verfahren zum Herstellen eines Laufs mit Laufflutungen zu schaffen, welches die Nachteile des Standes der Technik überwindet.
- 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.
- 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.
- 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.
- 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 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. - 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. - 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.
- 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 vonFig. 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 Modifikationen, die in den Rahmen der angeschlossenen Ansprüche fallen.
Claims (2)
- Verfahren zum Herstellen eines Laufs (1) durch Kaltschmieden eines zylindrischen Rohlings mit einer axialen Durchgangsbohrung, mit den Schritten:Einführen eines Schmiededorns in die axiale Durchgangsbohrung des zylindrischen Rohlings;Kaltschmieden des Laufs (1) mittels einer Laufhämmermaschine, die mehrere über den Umfang des Rohlings verteilte, radial auf den Rohling im Bereich des eingeführten Schmiededorns einwirkende Schmiedehämmer (3) hat;gekennzeichnet durch das Schmieden von Längsnuten (2) in den Rohling während des Kaltschmiedens mittels der genannten Schmiedehämmer (3), welche zu diesem Zweck zur Längsachse (4) des Rohlings parallele Rippen haben.
- 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.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HRP20161589TT HRP20161589T1 (hr) | 2013-03-07 | 2016-11-29 | 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 EP2964406A1 (de) | 2016-01-13 |
EP2964406B1 true 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) |
Families Citing this family (5)
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 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 (de) * | 1981-05-21 | 1982-12-09 | Carl Walther Gmbh, 7900 Ulm | Lauf fuer handfeuerwaffen, insbesondere sport- und jagdgewehre |
US4722216A (en) * | 1982-02-08 | 1988-02-02 | Grotnes Metalforming Systems, Inc. | Radial forging method |
FR2755042B1 (fr) | 1996-10-24 | 1998-12-24 | Lemforder Nacam Sa | Procede d'obtention de cannelures sur un arbre |
US6324780B1 (en) * | 1999-07-09 | 2001-12-04 | E.R. Shaw, Inc. | Fluted gun barrel |
AT408852B (de) * | 2000-06-23 | 2002-03-25 | Gfm Beteiligungs & Man Gmbh | Verfahren zum schmieden eines metallenen werkstückes |
US7950153B2 (en) * | 2005-03-23 | 2011-05-31 | Bishop Innovation Limited | Method of manufacturing a steering rack |
CA2615220C (en) * | 2005-07-15 | 2013-01-08 | Ernst Grob Ag | Method for producing internal and external toothings on thin-walled, cylindrical hollow parts |
EP2205926B1 (de) | 2007-11-02 | 2015-07-15 | Transmission Systems Limited | Projektilwaffen |
WO2011012766A1 (en) * | 2009-07-17 | 2011-02-03 | 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 |
-
2013
- 2013-03-07 AT ATA50157/2013A patent/AT514020B1/de not_active IP Right Cessation
-
2014
- 2014-01-15 ES ES14707312.6T patent/ES2607177T3/es active Active
- 2014-01-15 WO PCT/AT2014/050011 patent/WO2014134645A1/de active Application Filing
- 2014-01-15 US US14/772,465 patent/US9446440B2/en not_active Expired - Fee Related
- 2014-01-15 EP EP14707312.6A patent/EP2964406B1/de not_active Not-in-force
-
2016
- 2016-11-29 HR HRP20161589TT patent/HRP20161589T1/hr unknown
Also Published As
Publication number | Publication date |
---|---|
AT514020A1 (de) | 2014-09-15 |
US20160016217A1 (en) | 2016-01-21 |
WO2014134645A1 (de) | 2014-09-12 |
HRP20161589T1 (hr) | 2017-01-13 |
EP2964406A1 (de) | 2016-01-13 |
ES2607177T3 (es) | 2017-03-29 |
US9446440B2 (en) | 2016-09-20 |
AT514020B1 (de) | 2015-05-15 |
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