DE4429742A1 - Prodn. of a hollow piston rod with closure element, e.g. for vibration dampers - Google Patents

Prodn. of a hollow piston rod with closure element, e.g. for vibration dampers

Info

Publication number
DE4429742A1
DE4429742A1 DE19944429742 DE4429742A DE4429742A1 DE 4429742 A1 DE4429742 A1 DE 4429742A1 DE 19944429742 DE19944429742 DE 19944429742 DE 4429742 A DE4429742 A DE 4429742A DE 4429742 A1 DE4429742 A1 DE 4429742A1
Authority
DE
Germany
Prior art keywords
piston rod
hollow piston
closure element
prodn
vibration dampers
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Withdrawn
Application number
DE19944429742
Other languages
German (de)
Inventor
Robert Dipl Ing Pradel
Horst Mueller
Joachim Ofner
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.)
ZF Friedrichshafen AG
Original Assignee
Fichtel and Sachs AG
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 Fichtel and Sachs AG filed Critical Fichtel and Sachs AG
Priority to DE19944429742 priority Critical patent/DE4429742A1/en
Publication of DE4429742A1 publication Critical patent/DE4429742A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3221—Constructional features of piston rods
    • 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
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/26—Storage discharge welding

Abstract

Prodn. of a hollow piston rod comprising welding a closure element (7) to the piston rod (3) to close its end. The closure element is held under preloaded conditions against the piston rod and the joint (9) is produced by capacitor discharge welding.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer hohlen Kolbenstange entsprechend dem Oberbegriff aus Patent­ anspruch 1.The invention relates to a method for producing a hollow piston rod according to the generic term from patent claim 1.

Ein solches Herstellungsverfahren ist beispielsweise aus dem deutschen Gebrauchsmuster G 81 26 570 bekannt. Die in dem Gm vorgeschlagene Lösung des Verschließens mittels eines Kammer­ bolzens bereitet insbesondere bei dünnwandigen Kolbenstangen Probleme, da die vorhandene Wandstärke ein unzureichendes Um­ formvolumen für die Verbindung zwischen dem Kammerbolzen und der Kolbenstange besitzt.Such a manufacturing process is for example from the German utility model G 81 26 570 known. The in the Gm proposed solution of closing by means of a chamber bolt prepares especially for thin-walled piston rods Problems, because the existing wall thickness is an insufficient order mold volume for the connection between the bolt and the piston rod has.

Die in dieser Schrift alternativ aufgezeigten Schweiß- und Lötmethoden sind insbesondere deshalb so problematisch, weil der Nachbearbeitungsaufwand für die Schweißnaht erheblich ist. Noch wichtiger ist jedoch die Gefahr, daß Fehlstellen der Schweißnaht bei der Nachbearbeitung auftreten, die beim späteren Einsatz der Kolbenstange im Schwingungsdämpfer die Kolbenstangendichtung beschädigen, da die Fehlstelle in dem betroffenen Hubbereich liegt.The welding and welding methods shown alternatively in this document Soldering methods are particularly problematic because the post-processing effort for the weld seam is considerable. Even more important, however, is the risk of missing parts of the Weld seam occur in the post-processing, which in later use of the piston rod in the vibration damper Damage the piston rod seal as the missing part in the affected stroke range.

Aufgabe der vorliegenden Erfindung ist es, eine hohle Kolben­ stange zu realisieren, die bei einer geringen Wandstärke zu­ verlässig verschlossen wird und an der Verschlußstelle keine Fehlstellen aufweist, die den Betrieb des Schwingungsdämpfers negativ beeinflussen können.The object of the present invention is a hollow piston rod to realize that with a small wall thickness too is reliably closed and none at the point of closure Has defects that the operation of the vibration damper can negatively influence.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, indem der Schließkörper unter Vorspannung zur Kolbenstange gehalten und mittels eines Kondensatorentladungsschweißverfahren die Ver­ bindung hergestellt wird.According to the invention the object is achieved in that the Closing body held under pretension to the piston rod and  using a capacitor discharge welding process the Ver bond is made.

Vorteilhafterweise wird durch die Vorspannung das Auftreten von Fehlstellen zuverlässig vermieden. Die Vorspannung liegt auf einem relativ niedrigen Niveau, so daß die Kürzung der Kolbenstange praktisch zu vernachlässigen ist. Es können auch keine Fehlstellen durch Schweißzusatzwerkstoffe oder Gasein­ schlüsse entstehen. Des weiteren treten keine nennenswerten Winkelfehler zwischen dem Schließkörper und der Kolbenstange auf.Advantageously, the occurrence is caused by the bias reliably avoided from defects. The bias is there at a relatively low level, so the cut in Piston rod is practically negligible. It can too no defects due to welding consumables or gas conclusions arise. Furthermore, there are no noteworthy Angular error between the closing body and the piston rod on.

Für eine kostenoptimierte Kontaktfläche, die es ermöglicht, auch qualitativ einfachere Herstellungsverfahren für das Be­ arbeiten der Kolbenstange auf die vorgesehene Länge zu ver­ wenden, wird an die hohle Kolbenstange eine Fase angearbeitet wird. Dabei hat es sich als besonders vorteilhaft herausge­ stellt, wenn die Fase am Innendurchmesser der Kolbenstange angearbeitet ist. Der durch die Vorspannung in Verbindung mit der beim Schweißverfahren auftretende Materialfluß mit seiner Wulstbildung wird gezielt dahingehend gelenkt, daß der Wulst am Außendurchmesser der Kolbenstange auftritt, dabei aber vom Volumen durch die Fase recht klein ist. Dieser die Schweißnaht bildende Wulst wird in einem weiteren Arbeitsschritt entfernt.For a cost-optimized contact surface that enables also simpler manufacturing processes for the Be work the piston rod to the intended length turn, a chamfer is worked on the hollow piston rod becomes. It has proven to be particularly advantageous if the chamfer on the inside diameter of the piston rod is worked on. The through the preload in connection with the material flow occurring during the welding process with its Bead formation is directed in such a way that the bead occurs on the outside diameter of the piston rod, but from Volume through the chamfer is quite small. This the weld The bulge is removed in a further step.

Anhand der folgenden Figurenbeschreibung soll die Erfindung näher erläutert werden.Based on the following description of the figures, the invention is intended are explained in more detail.

Die einzige Figur zeigt ein oberes Ende eines Schwingungs­ dämpfers 1 mit einer hohlen Kolbenstange 3. Die hohle Kolben­ stange 3 besteht aus einem auf die entsprechende Länge bear­ beiteten Rohrkörper 5, der endseitig von einem Schließkörper 7 verschlossen wird. Bei der Herstellung einer Verbindung 9 zwischen dem Schließkörper 7 und dem Rohrkörper 5 werden beide Teile 5; 7 einer axialen Vorspannung innerhalb einer nichtdar­ gestellten Vorrichtung unterworfen. Anschließend erfolgt bei gehaltener Vorspannung eine Verflüssigung der Korngrenzen im Kontaktbereich zwischen dem Schließkörper 7 und dem Rohrkör­ per 5 mittels eines Kondensatorentladungsschweißverfahrens, wobei eine geringfügige Verkürzung der Baueinheit 3 auftritt. Das durch die Vorspannung verdrängte Material "fließt" unter Bildung eines Wulstes 11 nach radial außen, was durch eine am Innendurchmesser 13 der Kolbenstange 3 angearbeitete Fase 15 noch stärker ausgerichtet erfolgt, wobei das Fließvolumen ebenfalls durch die Fase 15 sehr gering ist. Die Vorspannung in Verbindung mit der Fließbewegung verhindert wirksam die Bildung schädlicher Fehlstellen, die während des Betriebes des Schwingungsdämpfers 1 eine Kolbenstangendichtung 17 beschädi­ gen könnten.The single figure shows an upper end of a vibration damper 1 with a hollow piston rod 3rd The hollow piston rod 3 consists of a tubular body 5 machined to the appropriate length, which is closed at the end by a closing body 7 . When establishing a connection 9 between the closing body 7 and the tubular body 5 , both parts 5 ; 7 subjected to axial preload within a device not shown. This is followed by a liquefaction of the grain boundaries in the contact area between the closing body 7 and the Rohrkör by 5 by means of a capacitor discharge welding process, with a slight shortening of the assembly 3 occurs. The material displaced by the prestress "flows" radially outwards with the formation of a bead 11 , which is made even more aligned by a chamfer 15 worked on the inner diameter 13 of the piston rod 3 , the flow volume also being very small through the chamfer 15 . The bias in connection with the flow movement effectively prevents the formation of harmful defects that could damage a piston rod seal 17 during operation of the vibration damper 1 gene.

Im verschweißten Zustand wird abschließend der Wulst 11 bei der Weiterbearbeitung des Schließkörpers 7 zu einem Stift, beispielsweise in der gestrichelt dargestellten Form, ent­ fernt.In the welded state, the bead 11 is finally removed during further processing of the closing body 7 into a pin, for example in the form shown in dashed lines.

Claims (4)

1. Verfahren zur Herstellung einer hohlen Kolbenstange für einen Schwingungsdämpfer, bei dem ein Schließkörper auf die hohle Kolbenstange geschweißt wird und diese endseitig verschließt, dadurch gekennzeichnet, daß der Schließkörper (7) unter Vorspannung zur Kolbenstange (3) gehalten und mittels eines Kondensatorentladungsschweiß­ verfahren die Verbindung (9) hergestellt wird.1. A method for producing a hollow piston rod for a vibration damper, in which a closing body is welded to the hollow piston rod and closes it at the end, characterized in that the closing body ( 7 ) is held under tension to the piston rod ( 3 ) and moved by means of a capacitor discharge welding Connection ( 9 ) is established. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß an die hohle Kolbenstange (3) eine Fase (15) angearbeitet wird.2. The method according to claim 1, characterized in that a chamfer ( 15 ) is worked on the hollow piston rod ( 3 ). 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Fase (15) am Innendurchmesser (13) der Kolbenstan­ ge (3) angearbeitet ist.3. The method according to claim 2, characterized in that the chamfer ( 15 ) on the inner diameter ( 13 ) of the piston rod GE ( 3 ) is worked on. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein die Schweißnaht bildender Wulst (11) in einem weiteren Arbeitsschritt entfernt wird.4. The method according to claim 1, characterized in that a bead forming the weld seam ( 11 ) is removed in a further step.
DE19944429742 1994-08-22 1994-08-22 Prodn. of a hollow piston rod with closure element, e.g. for vibration dampers Withdrawn DE4429742A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19944429742 DE4429742A1 (en) 1994-08-22 1994-08-22 Prodn. of a hollow piston rod with closure element, e.g. for vibration dampers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944429742 DE4429742A1 (en) 1994-08-22 1994-08-22 Prodn. of a hollow piston rod with closure element, e.g. for vibration dampers

Publications (1)

Publication Number Publication Date
DE4429742A1 true DE4429742A1 (en) 1996-02-29

Family

ID=6526270

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19944429742 Withdrawn DE4429742A1 (en) 1994-08-22 1994-08-22 Prodn. of a hollow piston rod with closure element, e.g. for vibration dampers

Country Status (1)

Country Link
DE (1) DE4429742A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19950166A1 (en) * 1999-10-19 2001-06-13 Daimler Chrysler Ag Procedure for closing of hole on metallic workpiece has stamping rivet used as bolt whose edge is welded with workpiece and for hardened workpiece, several welding pulses are placed
WO2010020240A3 (en) * 2008-08-22 2010-04-15 Neumayer Tekfor Holding Gmbh Axial piston machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8126570U1 (en) * 1981-09-09 1982-02-11 Mannesmann AG, 4000 Düsseldorf Motor vehicle strut with retracted tube ends
DE4240837A1 (en) * 1992-12-04 1994-06-09 Fichtel & Sachs Ag Method of fixing tube socket onto main tube for vibrations damper - involves sleeve being tensionally arranged on main tube and both welded together with a hole then drilled through sleeve base and tube wall

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8126570U1 (en) * 1981-09-09 1982-02-11 Mannesmann AG, 4000 Düsseldorf Motor vehicle strut with retracted tube ends
DE4240837A1 (en) * 1992-12-04 1994-06-09 Fichtel & Sachs Ag Method of fixing tube socket onto main tube for vibrations damper - involves sleeve being tensionally arranged on main tube and both welded together with a hole then drilled through sleeve base and tube wall

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DVS-Merkblätter-Widerstandsschweißtechnik, Bd. 68,Teil III, Düsseldorf: Deutscher Verlag für Schweißtechnik, S. 52-55 u. 188 *
FRÜNGEL, F., KUPER, G., HARTUNG, R.: "Feintech- nische Schweißverfahren mit kurzzeitiger Energie" in "Bull. ASE" 64 (1973) 16, 4. August, S.962-968 *
GALCINSKIJ, L.V.: "Besonderheiten des Kondensator-punktschweißens und Möglichkeiten seiner Anwen- dung" in "Schweißtechnik", Berlin 34 (1984) 12, S. 552-553 *
STANLEY, W.A.: Resistance Welding, New York u.a.: McGraw-Hill Book Company, 1950, S. 13, 14,213-216 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19950166A1 (en) * 1999-10-19 2001-06-13 Daimler Chrysler Ag Procedure for closing of hole on metallic workpiece has stamping rivet used as bolt whose edge is welded with workpiece and for hardened workpiece, several welding pulses are placed
WO2010020240A3 (en) * 2008-08-22 2010-04-15 Neumayer Tekfor Holding Gmbh Axial piston machine

Similar Documents

Publication Publication Date Title
DE4114307C2 (en) Vibration damper
DE19711789A1 (en) Manufacture of exhaust gas purification unit containing e.g. catalyst and comprising cylindrical section with double end cone transitions
DE102016100470A1 (en) Assembly with at least two components of an exhaust system and method of joining
DE10023149A1 (en) High pressure fuel injection pipe for diesel engine, has pair of independent units of outer pipe joined together in both ends through seal ring
DE3040652C2 (en)
DE2729522C2 (en) Housing for an emission-safe valve and method for its manufacture
DE112018007369T5 (en) Cylinder device and method for making a rod
DE102008043694A1 (en) Ball joint for e.g. chassis assembly of motor vehicle, has housing lower and upper parts connected together at contact region by welding seam, which is bent in angle from specific range of degrees to central longitudinal axis of joint
EP1628038B1 (en) Piston rod for a vibration damper with amplitude-dependent damping
DE4429742A1 (en) Prodn. of a hollow piston rod with closure element, e.g. for vibration dampers
EP1468185B1 (en) Nozzle clamping nut for injection valves and method for producing said nozzle clamping nut
DE102011056340A1 (en) Stabilizer arrangement for a motor vehicle and method for producing a stabilizer section
DE19843825A1 (en) Production of steering arm for vehicle chassis involves first cold-shaping one end of tubular bend into structural element at one end which is then bent forwards and finally shaped by internal high pressure shaping
EP1317988B1 (en) Component in vehicle parts with a joint achieved by pressure welding
DE19934256C1 (en) Method of welding a fastening tube to the end of a tubular stabilizer arm
DE102008047076A1 (en) Soldering component useful in a heat exchanger, comprises a first component and a second component, which are joined to each other in the area of a joining connection with a joining fit
DE10237215B3 (en) Linkage cuff and shaft pin coupling method e.g. for automobile drive shaft, uses pulse welding for reduction of sleeve fitted over contact point between shaft pin flange and linkage cuff
DE19913793A1 (en) Procedure for manufacture of HP pipe distributing fuel to injectors of internal combustion engine entails attachment of nipples by friction welding to main pipe, with main pipe and nipples made of high strength non-rusting material
DE19704214C2 (en) Vibration damping device
EP1496284A1 (en) Passive clamping of air spring bellows and tubes
DE102020129877B3 (en) Mold and method of hydroforming to form a hollow member
EP3322912B1 (en) Vibration damper
DE10033060B4 (en) Method for producing a cylinder with a bottom closed at the end
DE620659C (en) Solder connection of metal pipes inserted into one another, especially vehicle frames
DE19516412C1 (en) Oscillation damper cylinder for motor vehicles

Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8127 New person/name/address of the applicant

Owner name: MANNESMANN SACHS AG, 97422 SCHWEINFURT, DE

8130 Withdrawal