DE10027542B4 - Method for producing a helicopter structural connection part for increasing the strength without subsequent heat treatment - Google Patents
Method for producing a helicopter structural connection part for increasing the strength without subsequent heat treatment Download PDFInfo
- Publication number
- DE10027542B4 DE10027542B4 DE2000127542 DE10027542A DE10027542B4 DE 10027542 B4 DE10027542 B4 DE 10027542B4 DE 2000127542 DE2000127542 DE 2000127542 DE 10027542 A DE10027542 A DE 10027542A DE 10027542 B4 DE10027542 B4 DE 10027542B4
- Authority
- DE
- Germany
- Prior art keywords
- metal bellows
- cylindrical tube
- heat treatment
- producing
- subsequent heat
- 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.)
- Expired - Fee Related
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Classifications
-
- 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
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Diaphragms And Bellows (AREA)
- Joints Allowing Movement (AREA)
Abstract
Verfahren zur Herstellung eines Hubschrauber-Strukturverbindungsteils in Form eines federnden Metallbalgs (2), ohne nachträgliche Wärmebehandlung, mit folgenden Schritten:
– Formen eines metallischen Bleches zu einem zylindrischen Rohr (1) mit einer Naht,
– Längsverschweißen der Naht des zylindrischen Rohres (1),
– Umformen des zylindrischen Rohres (1) zu einem Metallbalg (2), wobei Innenkrempen (20) und Außenkrempen (21) gebildet werden, und
– Kugelstrahlen des umgeformten Metallbalgs (1) mindest in einem Bereich (A) der Innenkrempen (20).Method for producing a helicopter structural connecting part in the form of a resilient metal bellows (2), without subsequent heat treatment, comprising the following steps:
Forming a metal sheet into a cylindrical tube (1) with a seam,
Longitudinal welding of the seam of the cylindrical tube (1),
- Forming the cylindrical tube (1) to a metal bellows (2), said inner rim (20) and outer rim (21) are formed, and
- Shot peening of the deformed metal bellows (1) at least in a region (A) of the inner brims (20).
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines Hubschrauber-Strukturverbindungsteils mit einer Steigerung der Festigkeit eines Metallbalges ohne nachträgliche Wärmebehandlung, wobei der Metallbalg gefertigt wird durch
- – Formen eines metallischen Bleches zu einem zylindrischen Rohr mit einer Naht,
- – Längsverschweißen der Naht des zylindrischen Rohres,
- – Umformen des zylindrischen Rohres zu einem Metallbalg, wobei Innen- und Außenkrempen gebildet werden
- Forming a metal sheet into a cylindrical pipe with a seam,
- Longitudinal welding of the seam of the cylindrical tube,
- - Forming the cylindrical tube to a metal bellows, wherein inner and outer brims are formed
Im Hubschrauberbau werden seit langem Metallbälge eingesetzt. Der Balg ist wulstförmig entlang seiner Höhe ausgebildet, besitzt einen zylindrischen Querschnitt und besteht aus Metall. Der Metallbalg wird als ein Federmittel bei Strukturverbindungen am Hubschrauber eingesetzt. Eine solche Strukturverbindung ist beispielsweise die Verbindung des Getriebeblockes vom Hauptrotor mit dem Deckenboden der Hubschrauberzelle. Der Metallbalg ist dort als Schwingungsisolator eingesetzt.in the Helicopter construction has long been used metal bellows. The bellows is bulbous along its height formed, has a cylindrical cross section and consists made of metal. The metal bellows is used as a spring means in structural joints used on the helicopter. Such a structural connection is for example the connection of the gearbox block from the main rotor to the ceiling floor the helicopter cell. The metal bellows is there as a vibration isolator used.
Andere Anwendungen ergeben sich im Strukturaufbau der Hubschrauberzelle. Gegenüber einer Spiralfeder hat der Metallbalg nicht nur den Vorteil einer Leichtbauweise, eines geringen Einbauvolumens bei annähernd ähnlichen physikalischen Parametern, sondern er ermöglicht als Federmittel auch einen gleichzeitigen Einsatz als Abdichtmittel gegenüber einem gasförmigen oder hydraulischen Medium.Other Applications arise in the structural design of the helicopter cell. Opposite one Spiral spring, the metal bellows not only has the advantage of a lightweight construction, a low installation volume with approximately similar physical parameters, but he allows as a spring means also a simultaneous use as a sealant across from a gaseous one or hydraulic medium.
So ein Metallbalg wird nach den folgenden, prinzipiellen Schritten
- – Formen eines Bleches zu einem zylindrischen Rohr,
- – Längsverschweißen der Naht des zylindrischen Rohres,
- – Umformen des zylindrischen Rohres zu einem Metallbalg,
- Forming a sheet into a cylindrical tube,
- Longitudinal welding of the seam of the cylindrical tube,
- Forming the cylindrical tube into a metal bellows,
Im Hubschrauberbau hat sich gezeigt, daß ein solcher Metallbalg nicht die maximal mögliche Lebensdauer bei hohen Lastwechseln erreicht. Vorab der maximal möglichen Lebensdauer kommt es häufig zu einem Versagen, d. h. bevorzugt zu einem Bruch entlang der Innenkrempe. Diese Feststellung trifft auch zu für galvanisch hergestellte Metallbälge. Diesen Nachteil versuchte man bisher dadurch auszugleichen, daß Änderungen in der Dimensionierung des Materials (wie z. B. Erhöhung der Wandstärke, Mehrwandigkeit, Faltenbreite) vorgenommen werden.in the Helicopter construction has been shown that such a metal bellows are not the maximum possible Lifetime at high load changes achieved. Advance of the maximum possible Lifespan comes often to a failure, d. H. preferred to break along the inner brim. This statement also applies to electroplated metal bellows. this Disadvantage you tried so far compensate by making changes in the dimensioning of the material (such as increasing the Wall thickness, multiwall, Fold width) are made.
Die dynamische Festigkeit des Werkstoffs vom Metallbalg ist somit nach dem Umformen nicht überall entlang seines Querschnitts gleich. Durch das galvanische Abscheiden von Nickel können Eigenspannungen, die die dynamische Fertigkeit des Metallbalges steigern, nur sehr begrenzt eingebracht werden.The dynamic strength of the material of the metal bellows is thus after not reshaping everywhere same way along its cross section. By the galvanic deposition of nickel can Residual stress, which is the dynamic skill of the metal bellows increase, be introduced only very limited.
Die
Aus
der
Aufgabe der Erfindung ist es, einen als Federmittel zu nutzenden Metallbalg, der durch Umformen und unter Verzicht einer Wärmebehandlung hergestellt wurde, für den Hubschrauberbau so herzustellen, dass eine höhere Lebensdauer trotz hoher Lastwechsel möglich wird.task It is the object of the invention to use a metal bellows to be used as spring means. which was produced by forming and waiving a heat treatment, for the Helicopter manufacture so that a longer life despite high load changes possible becomes.
Die Aufgabe wird dadurch gelöst, indem bei der speziellen Herstellung eines Hubschrauber-Strukturverbindungsteils in Form eines Metallbalges ohne nachträgliche Wärmebehandlung bzw. eines galvanisch hergestellten Metallbalges nach dem Umformen mindestens an den Innenkrempen kugelgestrahlt wird. Um die Maßhaltigkeit des Metallbalges wiederherzustellen, kann auch an den Außenkrempen kugelgestrahlt werden.The Task is solved by by in the specific manufacture of a helicopter structural connector in the form of a metal bellows without subsequent heat treatment or a galvanic produced metal bellows after forming at least at the inner rim is shot peened. To the dimensional accuracy can restore the metal bellows, also on the outer rim be shot-blasted.
Es wurde gefunden, dass an den Innenkrempen die Werkstoffverfestigung nach dem Umformen am geringsten ist. Dort kommt es zum frühzeitigen Versagen des Metallbalges durch Bruch. Der Werkstoff des Metallbalges ist entlang seines Balgquerschnittes ungleichmäßig verfestigt. Durch das Kugelstrahlen wird in den Metallbalg ein gleichmäßiges Niveau an Druckeigenspannungen im Bereich der Innenkrempen eingebracht.It has been found that material hardening at the inner rim is the lowest after forming. There it comes to the early failure of the metal bellows by breakage. The material of the metal bellows is unevenly consolidated along its bellows cross-section. By shot peening into the metal bellows a uniform level of residual compressive stresses in the In introduced nenkrempen.
Somit wird durch das Kugelstrahlen eine höhere dynamische Festigkeit des Metallbalges erzielt. Auf diese Weise kann die Lebensdauer eines Metallbalges deutlich verlängert werden. Ein vorzeitiges Versagen entlang der Innenkrempe wird nach dem erfindungsgemäßen Verfahren im wesentlichen vermieden. Durch das Kugelstrahlen wird ebenfalls die kerbige Oberflächenstruktur der Schweißnaht geglättet, so daß eine Reduktion der Kerbwirkung erreicht wird. Das Kugelstrahlen erweist sich als äußerst wirtschaftlich, um eine höhere dynamische Festigkeit des Metallbalges zu erzielen.Consequently The shot peening increases the dynamic strength achieved the metal bellows. In this way, the life of a Metal bellows significantly extended become. A premature failure along the inner brim will diminish the method according to the invention essentially avoided. By shot peening is also the notched surface structure the weld smoothed so that one Reduction of notch effect is achieved. The shot peening proves prove to be extremely economical, to a higher one to achieve dynamic strength of the metal bellows.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und im folgenden näher beschrieben. Es zeigenOne embodiment The invention is illustrated in the drawing and in the following described in more detail. Show it
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE2000127542 DE10027542B4 (en) | 2000-06-02 | 2000-06-02 | Method for producing a helicopter structural connection part for increasing the strength without subsequent heat treatment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000127542 DE10027542B4 (en) | 2000-06-02 | 2000-06-02 | Method for producing a helicopter structural connection part for increasing the strength without subsequent heat treatment |
Publications (2)
Publication Number | Publication Date |
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DE10027542A1 DE10027542A1 (en) | 2001-12-13 |
DE10027542B4 true DE10027542B4 (en) | 2010-04-01 |
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DE2000127542 Expired - Fee Related DE10027542B4 (en) | 2000-06-02 | 2000-06-02 | Method for producing a helicopter structural connection part for increasing the strength without subsequent heat treatment |
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DE (1) | DE10027542B4 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114147124B (en) * | 2021-11-29 | 2023-07-21 | 天津航天长征火箭制造有限公司 | Continuous forming die of large-cavity diameter ratio compensator for spaceflight and forming control method thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2832613A (en) * | 1954-06-10 | 1958-04-29 | Flexonics Corp | Autogenous welded laminated expansion joint for conduits |
DE19506076A1 (en) * | 1995-02-22 | 1996-08-29 | Alcatel Kabel Ag | Corrugated metal tube manufacturing method for cable sheaths or waveguides |
JPH09264467A (en) * | 1996-03-28 | 1997-10-07 | Nippon Steel Corp | Flexible tube having high stress corrosion crack resistance |
-
2000
- 2000-06-02 DE DE2000127542 patent/DE10027542B4/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2832613A (en) * | 1954-06-10 | 1958-04-29 | Flexonics Corp | Autogenous welded laminated expansion joint for conduits |
DE19506076A1 (en) * | 1995-02-22 | 1996-08-29 | Alcatel Kabel Ag | Corrugated metal tube manufacturing method for cable sheaths or waveguides |
JPH09264467A (en) * | 1996-03-28 | 1997-10-07 | Nippon Steel Corp | Flexible tube having high stress corrosion crack resistance |
Non-Patent Citations (1)
Title |
---|
SCHÜTZ, W.: Kugelstrahlen zur Verbesserung der Schwingfestigkeit von Bauteilen. In: Z. Werkstofftechnik, Nr. 17 (1986) S. 53-61 * |
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Publication number | Publication date |
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DE10027542A1 (en) | 2001-12-13 |
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OP8 | Request for examination as to paragraph 44 patent law | ||
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R082 | Change of representative |
Representative=s name: GPI & ASSOCIES, FR Representative=s name: , |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
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Effective date: 20150101 |