DE102009012552A1 - Method for after-treatment of highly stressed region of chassis assembly of motor vehicle, involves implementing plastic deformation by applying mechanical energy on edge portion of welded seam and/or on notch portion of welded joint - Google Patents
Method for after-treatment of highly stressed region of chassis assembly of motor vehicle, involves implementing plastic deformation by applying mechanical energy on edge portion of welded seam and/or on notch portion of welded joint Download PDFInfo
- Publication number
- DE102009012552A1 DE102009012552A1 DE102009012552A DE102009012552A DE102009012552A1 DE 102009012552 A1 DE102009012552 A1 DE 102009012552A1 DE 102009012552 A DE102009012552 A DE 102009012552A DE 102009012552 A DE102009012552 A DE 102009012552A DE 102009012552 A1 DE102009012552 A1 DE 102009012552A1
- Authority
- DE
- Germany
- Prior art keywords
- welded
- mechanical energy
- treatment
- welded joint
- metal
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- B23P9/04—Treating or finishing by hammering or applying repeated pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/006—Vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
-
- 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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Nachbehandlung hoch beanspruchter Bereiche von insbesondere dynamisch belasteten Metallbauteilen für den Fahrzeugbau, bei dem zunächst Metallteile mittels einer Schweißverbindung zu dem Metallbauteil verschweißt werden.The The invention relates to a process for the after-treatment of highly stressed Areas of particular dynamically loaded metal components for the Vehicle construction, in the first metal parts by means of a Welded welded to the metal component become.
Aus dem Stand der Technik ist es bereits bekannt, Schweißverbindungen bei Metall-, insbesondere Stahlkonstruktionen, beispielsweise Brücken, Kränen und Maschinenbauteilen, aber auch bei Bauwerken und Anlagen, wie beispielsweise Windenergieanlagen, die häufig durch dynamische oder wechselnde Belastungen beansprucht sind, einer Nachbehandlung zu unterziehen. Diesen Maßnahmen liegt die Erkenntnis zugrunde, dass die Lebensdauer der Metallkonstruktionen vorrangig durch die Ermüdungsfestigkeit bestimmt wird, sodass eine Verbesserung der Ermüdungsfestigkeit in den meisten Fällen zu einer Erhöhung der Lebensdauer der Gesamtkonstruktion führt bzw. eine Reduzierung der Wanddicken ermöglicht.Out the prior art, it is already known, welded joints in metal, especially steel structures, such as bridges, cranes and machine components, but also in buildings and facilities, such as For example, wind turbines, often by dynamic or changing loads are claimed, a post-treatment to undergo. These measures are based on the knowledge that that the life of the metal structures are given priority by the Fatigue strength is determined, so an improvement fatigue resistance in most cases to increase the life of the overall construction leads or allows a reduction of the wall thicknesses.
Durch die in der Praxis bei Metallkonstruktionen eingesetzten Schweißverbindungen wird jedoch die Ermüdungsfestigkeit der so gefügten Konstruktionselemente wesentlich vermindert.By the welded joints used in practice in metal structures However, the fatigue strength of the so joined Design elements significantly reduced.
Eine Möglichkeit, diesen nachteiligen Effekt bei wechselnd beanspruchten Metallkonstruktionen zu reduzieren, bieten Verfahren zur Nachbehandlung der Schweißnaht. Es ist bereits bekannt, durch ein Überschleifen oder Ausschleifen eine Verbesserung der Nahtgeometrie zu erzeugen und dadurch die kritischen Kerbspannungen zu reduzieren. Dabei wird davon ausgegangen, dass Risse, beispielsweise durch Ermüdung, nicht in einer Schicht von Druckeigenspannung entstehen.A Possibility of this adverse effect with varying demands To reduce metal structures, provide aftertreatment methods Weld. It is already known, by a blending or grind to improve seam geometry and thereby reduce the critical notch stresses. It gets away from it that cracks, for example due to fatigue, do not form in a layer of compressive residual stress.
Die
Aus
dem Maschinenbau ist auch bereits das Kugelstrahlen bekannt. Beispielsweise
beschreibt die
Ferner ist es auch bereits bekannt, CO2-Laserstrahlung zur Induzierung von Eigenspannung zu nutzen. Hierdurch wird die Bauteilfestigkeit gegenüber konventionellen Verfahren gesteigert.Furthermore, it is already known to use CO 2 laser radiation to induce residual stress. As a result, the component strength is increased compared to conventional methods.
Der Erfindung liegt die Aufgabe zugrunde, die Nachbehandlung der Schweißverbindung derart in einem zweiten Schritt zu verbessern, dass die Ermüdungsfestigkeit der so gefügten Metallbauteile wesentlich verbessert wird.Of the Invention is based on the object, the aftertreatment of the welded joint so in a second step to improve the fatigue strength the so-joined metal components is significantly improved.
Diese Aufgabe wird gelöst mit einem Verfahren gemäß den Merkmalen des Patentanspruchs 1. Die Unteransprüche betreffen besonders zweckmäßige Weiterbildungen der Erfindung.These The object is achieved by a method according to Features of claim 1. The dependent claims relate particularly expedient developments of the invention.
Erfindungsgemäß ist also ein Verfahren zur Nachbehandlung hoch beanspruchter Bereiche von insbesondere dynamisch belasteten Metallbauteilen für den Fahrzeugbau vorgesehen, bei dem nach dem Verschweißen der Metallteile in einem zweiten Verfahrensschritt eine Umformung durch einen mechanischen Energieeintrag in einem Randbereich einer Schweißnaht und/oder einem Kerbbereich der Schweißverbindung zum Einbringen von Druckeigenspannungen durchgeführt wird. Hierdurch wird bei den dynamisch hoch belasteten Metallbauteilen im Kraftfahrzeugbau durch das Einbringen von Druckeigenspannungen die Rissfortschrittsgeschwindigkeit wesentlich reduziert. Dabei führen insbesondere Randschichtverfestigungen zu einer Verzögerung der Rissbildung. Beide Effekte erhöhen die Ermüdungsfestigkeit. Durch plastische Verformungen durch den mechanischen Energieeintrag kann also die Festigkeit erhöht werden, sodass bei unveränderter Festigkeit des Metallbauteils die Materialstärke der Metallteile reduziert wird und dadurch das Eigengewicht des Metallbauteils vermindert wird.According to the invention that is a process for the after-treatment of highly stressed areas in particular dynamically loaded metal components for provided the vehicle, in which after welding the metal parts in a second process step a transformation by a mechanical energy input in an edge region of a weld and / or a notch portion of the welded joint for insertion of residual compressive stresses is performed. This is at the dynamically highly loaded metal components in motor vehicle construction by the introduction of compressive residual stresses the rate of crack propagation significantly reduced. In particular, edge-layer consolidations result to a delay of cracking. Increase both effects the fatigue strength. By plastic deformation so the strength can be increased by the mechanical energy input so that with unchanged strength of the metal component the material thickness of the metal parts is reduced and thereby the weight of the metal component is reduced.
Als besonders vorteilhaft erweisen sich zu diesem Zweck Hämmerverfahren, die zusätzlich zu einer Ausrundung des Nahtübergangs führen und damit die Beanspruchungen aufgrund der geometrischen Kerbwirkung reduzieren. Bei der Anwendung wirken gehärtete Stahlstifte auf den Schweißnahtübergangsbereich ein, sodass mit jedem Schlag kleine plastische Eindrücke entstehen. Durch die Plastizierungen wird die Kerbschärfe des Nahtübergangs reduziert und der Werkstoffwiderstand erhöht. Die zur Nachbehandlung der Schweißnaht geeigneten Hämmerverfahren, beispielsweise das High Frequency Impact Treatment (HiFIT) und das Ultrasonic Impact Treatment (UIT), stellen effektive Methoden zur Erhöhung der Ermüdungsfestigkeit dar.For this purpose, hammering methods that additionally lead to a rounding of the seam transition and thus the stresses due to the geometri prove to be particularly advantageous reduce notch effect. When used hardened steel pins act on the weld seam transition area, so that with each blow small plastic impressions. The plasticization reduces the notch sharpness of the seam transition and increases the material resistance. The hammers suitable for after-treatment of the weld, such as the High Frequency Impact Treatment (HiFIT) and the Ultrasonic Impact Treatment (UIT), are effective methods for increasing the fatigue strength.
Als besonders vorteilhaft erweist es sich auch, wenn die Druckeigenspannungen in den Bereich der Einbrandkerbe der Schweißverbindung eingebracht werden, um so durch eine lokal begrenzte und somit mit geringem Nachbehandlungsaufwand einzubringende Verformung die Festigkeit wesentlich zu steigern.When It is also particularly advantageous if the compressive stresses in the area of the penetration groove of the welded joint be introduced so as to be limited by a local and therefore with low post-treatment effort to introduce deformation the strength significantly increase.
Dabei wird gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung durch den mechanischen Energieeintrag die Materialstärke zumindest eines Metallteils reduziert, ohne jedoch die Belastbarkeit des Metallbauteils zu vermindern. Vielmehr hat sich überraschend gezeigt, dass die Festigkeit auch bei einer derart aufgrund der Verformung eingebrachten Materialschwächung zuverlässig gesteigert werden kann.there is according to a further advantageous embodiment the invention by the mechanical energy input material thickness reduced at least one metal part, but without the capacity of the metal component. Rather, it has become surprising shown that the strength even with such because of Deformation introduced material weakening reliable can be increased.
In der Praxis erweisen sich dabei Metallteile für dynamisch belastete Bauteile als besonders Erfolg versprechend, bei denen die Materialstärke der Metallteile bis zu 3,5 mm, insbesondere zwischen 1,5 und 3,5 mm beträgt, wobei das Metallbauteil eine Baugruppe eines Kraftfahrzeugs ist. Neben Fahrwerksbaugruppen im Allgemeinen eignet sich das Verfahren insbesondere für Hilfsrahmen, Querlenker, Spurstangen, Längslenker, Blechradträger oder dergleichen.In In practice, metal parts prove to be dynamic loaded components as particularly promising, in which the material thickness of the metal parts up to 3.5 mm, in particular between 1.5 and 3.5 mm, wherein the metal component an assembly of a motor vehicle. In addition to chassis assemblies In general, the method is particularly suitable for Subframe, control arm, tie rods, trailing arm, plate carrier or similar.
Die Nachbehandlung kann grundsätzlich mittels Handgeräten durchgeführt werden. Besonders praxisgerecht ist es hingegen, wenn die Nachbehandlung mittels eines automatisierten Fertigungsverfahrens durchgeführt wird, in dem der mechanische Energieeintrag mittels eines Roboters, welcher vorzugsweise auch Einrichtungen zur Positionserfassung und Fertigungskontrolle aufweisen kann, erfolgt.The Aftertreatment can basically by means of handheld devices be performed. On the other hand, it is particularly practical if the aftertreatment by means of an automated manufacturing process is performed, in which the mechanical energy input by means of a robot, which preferably also means for position detection and production control, takes place.
Die Erfindung lässt zahlreiche Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips ist eine davon in der Zeichnung dargestellt und wird nachfolgend beschrieben. Diese zeigt jeweils in einer Prinzipdarstellung inThe Invention allows for numerous embodiments. To further clarify its basic principle, one of them is in the drawing and will be described below. These shows each in a schematic diagram in
Das
erfindungsgemäße Verfahren zur Nachbehandlung
hoch beanspruchter Bereiche von insbesondere dynamisch belasteten
Metallbauteilen
- 11
- Metallbauteilmetal component
- 22
- Metallteilmetal part
- 33
- Metallteilmetal part
- 44
- Schweißverbindungwelded joint
- 55
- Randbereichborder area
- 66
- SchweißnahtWeld
- 77
- Kerbbereichnotch area
- 88th
- Ausformungformation
- aa
- Materialstärkematerial thickness
- bb
- Materialhäufungmaterial accumulation
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - EP 0336161 A1 [0005] EP 0336161 A1 [0005]
- - US 2008/0001609 A1 [0006] US 2008/0001609 A1 [0006]
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009012552A DE102009012552A1 (en) | 2009-03-10 | 2009-03-10 | Method for after-treatment of highly stressed region of chassis assembly of motor vehicle, involves implementing plastic deformation by applying mechanical energy on edge portion of welded seam and/or on notch portion of welded joint |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009012552A DE102009012552A1 (en) | 2009-03-10 | 2009-03-10 | Method for after-treatment of highly stressed region of chassis assembly of motor vehicle, involves implementing plastic deformation by applying mechanical energy on edge portion of welded seam and/or on notch portion of welded joint |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102009012552A1 true DE102009012552A1 (en) | 2010-09-16 |
Family
ID=42557840
Family Applications (1)
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DE102009012552A Withdrawn DE102009012552A1 (en) | 2009-03-10 | 2009-03-10 | Method for after-treatment of highly stressed region of chassis assembly of motor vehicle, involves implementing plastic deformation by applying mechanical energy on edge portion of welded seam and/or on notch portion of welded joint |
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DE (1) | DE102009012552A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013071140A (en) * | 2011-09-27 | 2013-04-22 | Nippon Steel & Sumitomo Metal Corp | Welded joint excellent in fatigue resistance and method for manufacturing the same |
WO2018015529A1 (en) * | 2016-07-21 | 2018-01-25 | Sonats - Société Des Nouvelles Applications Des Techniques De Surface | Robotised hammering method and robotised system for implementing the method |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1184606B (en) * | 1960-05-06 | 1964-12-31 | Plansee Metallwerk | Process for welding molybdenum, tungsten and molybdenum or tungsten alloys |
DE1940969A1 (en) * | 1969-08-12 | 1971-04-15 | Lemmerz Werke Gmbh | Strengthening car wheel rims for supporting - tubeless tyres |
DE2205299A1 (en) * | 1972-02-04 | 1973-08-16 | Albert Dipl Ing Rappen | Improving weld bead toughness - by hot deforming to flatten bead |
DE2159607A1 (en) * | 1971-12-01 | 1973-09-13 | Thyssen Niederrhein Ag | Banked weld joints improvement - by ameliorating additional seams |
DE3804568C1 (en) * | 1988-02-13 | 1989-08-10 | Union Rheinische Braunkohlen Kraftstoff Ag, 5000 Koeln, De | |
EP0336161A1 (en) | 1988-03-18 | 1989-10-11 | Klaus Dr. Dipl.-Ing. Hoffmann | Method for improving the fatigue strength of welded high strength steels |
DE4327096A1 (en) * | 1993-08-12 | 1994-01-27 | Daimler Benz Ag | Method for increasing strength of fusion welded joints - of aluminium@ sections by shot peening weld joint area |
US20080001609A1 (en) | 2006-06-22 | 2008-01-03 | Takashi Kojima | Nondestructive inspection method and apparatus for a surface processed by shot peening |
DE102009001284A1 (en) * | 2008-03-04 | 2009-10-15 | Peter Gerster | Apparatus for hammering welded seams on metal components, to improve weld strength, comprises motor-driven striking tool controlled in response to metal surface characteristics |
-
2009
- 2009-03-10 DE DE102009012552A patent/DE102009012552A1/en not_active Withdrawn
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1184606B (en) * | 1960-05-06 | 1964-12-31 | Plansee Metallwerk | Process for welding molybdenum, tungsten and molybdenum or tungsten alloys |
DE1940969A1 (en) * | 1969-08-12 | 1971-04-15 | Lemmerz Werke Gmbh | Strengthening car wheel rims for supporting - tubeless tyres |
DE2159607A1 (en) * | 1971-12-01 | 1973-09-13 | Thyssen Niederrhein Ag | Banked weld joints improvement - by ameliorating additional seams |
DE2205299A1 (en) * | 1972-02-04 | 1973-08-16 | Albert Dipl Ing Rappen | Improving weld bead toughness - by hot deforming to flatten bead |
DE3804568C1 (en) * | 1988-02-13 | 1989-08-10 | Union Rheinische Braunkohlen Kraftstoff Ag, 5000 Koeln, De | |
EP0336161A1 (en) | 1988-03-18 | 1989-10-11 | Klaus Dr. Dipl.-Ing. Hoffmann | Method for improving the fatigue strength of welded high strength steels |
DE4327096A1 (en) * | 1993-08-12 | 1994-01-27 | Daimler Benz Ag | Method for increasing strength of fusion welded joints - of aluminium@ sections by shot peening weld joint area |
US20080001609A1 (en) | 2006-06-22 | 2008-01-03 | Takashi Kojima | Nondestructive inspection method and apparatus for a surface processed by shot peening |
US7567873B2 (en) * | 2006-06-22 | 2009-07-28 | Fuji Manufacturing Co., Ltd. | Nondestructive inspection method and apparatus for a surface processed by shot peening |
DE102009001284A1 (en) * | 2008-03-04 | 2009-10-15 | Peter Gerster | Apparatus for hammering welded seams on metal components, to improve weld strength, comprises motor-driven striking tool controlled in response to metal surface characteristics |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013071140A (en) * | 2011-09-27 | 2013-04-22 | Nippon Steel & Sumitomo Metal Corp | Welded joint excellent in fatigue resistance and method for manufacturing the same |
WO2018015529A1 (en) * | 2016-07-21 | 2018-01-25 | Sonats - Société Des Nouvelles Applications Des Techniques De Surface | Robotised hammering method and robotised system for implementing the method |
FR3054154A1 (en) * | 2016-07-21 | 2018-01-26 | Sonats - Societe Des Nouvelles Applications Des Techniques De Surface | ROBOTISE DRYING METHOD AND ROBOTIC SYSTEM FOR IMPLEMENTING THE METHOD |
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