EP2703653A1 - Method for producing a piston-piston rod unit and piston-piston rod unit - Google Patents

Method for producing a piston-piston rod unit and piston-piston rod unit Download PDF

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Publication number
EP2703653A1
EP2703653A1 EP12006232.8A EP12006232A EP2703653A1 EP 2703653 A1 EP2703653 A1 EP 2703653A1 EP 12006232 A EP12006232 A EP 12006232A EP 2703653 A1 EP2703653 A1 EP 2703653A1
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EP
European Patent Office
Prior art keywords
piston rod
piston
buffer sleeve
laser
buffer
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
EP12006232.8A
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German (de)
French (fr)
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EP2703653B1 (en
Inventor
Tobias Jene
Werner Sauer
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Festo SE and Co KG
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Festo SE and Co KG
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Priority to EP12006232.8A priority Critical patent/EP2703653B1/en
Priority to CN201310491210.0A priority patent/CN103671907B/en
Publication of EP2703653A1 publication Critical patent/EP2703653A1/en
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Publication of EP2703653B1 publication Critical patent/EP2703653B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/223—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which completely seals the main fluid outlet as the piston approaches its end position

Definitions

  • the invention relates to a method for producing a piston-piston rod unit for a fluid power device, such as a working cylinder or a shock absorber, wherein the piston has a central opening for attachment to the piston rod, and wherein the piston-piston rod unit at least one in the fluidic Applicable for damping purposes, has attachable to the piston rod buffer sleeve.
  • the invention further relates to a piston-piston rod unit.
  • a piston-piston rod unit of this type is for example in the EP 1 503 114 A1 disclosed.
  • the piston-piston rod unit described therein has a piston rod to which a piston is fitted with a central opening and axially immovably fixed between two axially fixedly connected to the piston rod holding surfaces.
  • at least one of the holding surfaces is formed by a screwed onto an externally threaded metallic mounting portion of the piston rod, innengewindelosen metallic retaining ring, which is welded by a concentric with the piston rod laser weld with the piston rod.
  • the retaining ring may in this case have a multiple function and be formed so that it forms anchoring means for a piston rod coaxial with the piston.
  • the retaining ring have a circumferential radial undercut, in which the buffer piston can engage with one or more hook-like anchoring elements or other suitable anchoring elements.
  • the object of the invention is to provide a method for producing a piston-piston rod unit of the type mentioned, with which a buffer sleeve can be connected in a simple and cost-effective manner with the piston rod or to provide a piston-piston rod unit, which is cheaper to manufacture compared to conventionally manufactured piston-piston rod units.
  • the buffer sleeve is thus connected by means of laser beam welding to the piston rod.
  • a machining of the piston rod before attaching the buffer sleeve is therefore no longer necessary. It can be a labor-consuming and cost-intensive processing step can be saved. Furthermore, other fastening means, such as the mentioned in the prior art retaining ring is not necessary.
  • the laser beam welding or laser welding is characterized by a low, concentrated energy input into the piston rod, which causes a relatively small thermal distortion of the piston rod. Therefore, the dimensional accuracy of a piston-piston rod unit produced in this way is relatively large.
  • the surface of the piston rod is roughened before attaching the buffer sleeve to at least one structuring region by means of laser processing and the buffer sleeve is then positioned over the resulting structuring region.
  • the laser processing of the piston rod surface creates micro-sized craters, which are advantageous for the cohesion between the buffer sleeve and the piston rod. For example, this increases the effective contact surface between the two components.
  • the at least one patterning region can be formed on a small or large area.
  • the structuring region is expediently relatively uniform overall, so that a uniformly roughened surface results.
  • the structuring region is formed annularly over the circumference of the piston rod.
  • a plurality of annular structuring regions arranged one behind the other in the axial direction of the piston rod are lasered.
  • These annular structuring regions may also be referred to as retaining rings, although these are of course not separate components, such as the retaining ring described in the prior art.
  • the piston is also connected by means of laser beam welding to the piston rod. It is thus possible that both the piston and the at least one buffer sleeve are laser-welded to the piston rod.
  • the piston is attached to the piston rod before roughening the piston rod surface for the buffer sleeves and preferably connected thereto. Due to the fact that the piston is already positioned on the piston rod, defined structuring ranges can be defined, at which the laser processing is carried out.
  • the buffer sleeve is pressed during laser beam welding to the piston rod by means of joining force on the piston rod surface.
  • the number of structuring areas, the design and the dimensioning depend on the joining force. If the joining force is thus relatively low, it is expedient to form a plurality of structuring regions, for example a plurality of retaining rings arranged one behind the other.
  • the joining force is generated by the material of the buffer sleeve itself. This can be achieved, for example, in that the diameter of the piston rod has an excess compared to the inner diameter of the buffer sleeve. In this case, the buffer sleeve is thus under tension when it is positioned on the piston rod.
  • the buffer sleeve made of laser-transparent material and the connection to the piston rod by means of laser transmission welding.
  • the material of the buffer sleeve is therefore transparent in this case for the laser wavelength of the laser used.
  • the laser can radiate through the laser-transparent material almost unhindered, whereby the buffer sleeve hardly heats up.
  • the material of the piston rod such as stainless steel, however, is heated and releases the heat to the buffer sleeve, whereby the material of the buffer sleeve melts and in particular flows into the previously roughened crater area on the piston rod surface, whereby a joint assembly is formed.
  • thermoplastic plastic material In a further development of the invention is used as a buffer sleeve material thermoplastic plastic material.
  • Polyphenylene sulfide (PPS), polyphenylene vinyl (PPV) or fiber-reinforced polyamide are particularly suitable for this purpose.
  • the invention further relates to a piston-piston rod unit for a fluid power device such as a working cylinder or a shock absorber, with a piston rod on which a central opening provided with a piston and connected to the piston rod such that it is fixed axially immovable , and with at least one usable in the fluid power device for damping purposes buffer sleeve, which is plugged onto the piston rod and there connected to the piston rod such that it is fixed axially immovable.
  • the piston-piston rod unit according to the invention is characterized in that the buffer sleeve is connected to the piston rod by means of at least one laser welding seam formed by laser beam welding.
  • the buffer sleeve is thus connected directly to the piston rod.
  • Other fasteners for attaching the buffer sleeve to the piston rod are not used.
  • the single FIGURE shows a partially dot-dashed section of a fluid power device 11, which is an example of a fluid operated by a power cylinder, in particular a pneumatic cylinder.
  • the fluid power device 11 has an elongated housing 12, in which a piston 13 is arranged, which divides two working chambers 14a, 14b from each other while sealing.
  • the piston 13 can be moved axially.
  • the movement of the piston 13 can be tapped outside of the housing 12 on a piston rod 15, which passes through one or both end-side end walls of the housing 12 under sealing, and with the piston 13 to a piston-piston rod unit 16 designated unit is summarized.
  • the piston rod 15 thus makes the movement of the piston 13 directly with.
  • the piston-piston rod unit 16 can also be used in other fluid power devices use, for example in shock absorbers, where in the piston rod 15 to be damped shocks are initiated.
  • the piston 13 has a central opening, with which it is attached to the piston rod 15 coaxially.
  • the piston rod 15 is made of metal, for example made of stainless steel or aluminum.
  • the piston 13 is connected to the piston rod 15 by means of laser beam welding. This can be done for example by two concentric in the axial direction of the piston rod 15 laser welds 17a, 17b.
  • the piston-piston rod unit further has at least one buffer sleeve 18, which is used in the fluid power device 11 for damping purposes in the end position damping of the piston-piston rod unit 16.
  • two buffer sleeves 18 are provided, which are attached to the left and right of the piston 13 on the piston rod 15 and are connected there in the manner explained in more detail below by means of load beam welding to the piston rod 15.
  • the buffer sleeves 18 are made of a laser-transparent material which is permeable to the wavelength of the laser used.
  • the buffer tube material is a thermoplastic material, for example Polyphenylene sulfide (PPS), polyphenylene vinyl (PPV) or fiber-reinforced polyamide, in particular Ultramid (trademark of BASF).
  • the surface of the piston rod 15 is roughened on a plurality of structuring regions 19 by means of laser processing.
  • the structuring regions 19 extend concentrically around the piston rod 15 and can therefore also be referred to as retaining rings. At the structuring regions 19 are also associated with these laser welds 20, over which the buffer sleeves 18 are laser welded in the manner explained in more detail below with the piston rod 15.
  • the piston 13 is first pushed onto the piston rod 15. It is possible that the region where the piston 13 is to be positioned on the piston rod 15 is machined before attaching the piston 13 by means of laser machining. After attaching the piston 13, this is connected by means of laser beam welding to the piston rod 15.
  • the structuring regions 19 are produced on the surface of the piston rod 15 by means of laser processing.
  • so-called annular retaining rings are alsogelasert so that 15 micro-small craters arise in the surface of the piston rod.
  • the structuring regions 19 are located on the left and on the right of the piston 13 already mounted on the piston rod 15.
  • a plurality of retaining rings arranged one behind the other in the axial direction of the piston rod 15 can be formed.
  • the buffer sleeves 18 are pushed onto the piston rod 15 until they abut with their insertion end to the piston, whereby the position of the buffer sleeves 18 is predetermined.
  • the diameter of the piston rod 15 has over the inner diameters of the buffer sleeves 18 an excess, so that the buffer sleeves 18 expand when pushed. This is readily possible, since the buffer sleeves 18, as already mentioned, are made of thermoplastic material that is elastically yielding.
  • the buffer sleeves 18 thus press in their deferred position under tension on the surface of the piston rod 15. As a result, a joining force is generated, which is used in the subsequent connection of the buffer sleeves 18 with the piston rod 15.
  • the buffer sleeves 18 are connected by means of laser transmission welding to the piston rod 15.
  • the laser beam passes through the laser-transparent material of the buffer sleeve 18 to be processed and heats the piston rod, wherein the heat is transferred from the piston rod to the buffer sleeve.
  • the material of the buffer sleeve melts in the contact area piston rod surface / buffer sleeve inner wall and flows into the formed on the holders crater area of the roughened piston rod surface.
  • the welding process can be carried out such that laser welding seams 20 are formed successively on the annular retaining rings or patterning regions 19 by means of a laser.
  • the two buffer sleeves 18 are simultaneously laser-welded to the piston rod 15 by means of two laser beams, which are each associated with one of the buffer sleeve.

Abstract

The method involves attaching the piston (13) on the piston rod (15) and connecting the piston with the piston rod such that the piston is axially immovable on the piston rod. A buffer sleeve (18) is attached on the piston rod, and the buffer sleeve is connected with the piston rod by laser beam welding such that the buffer sleeve is axially immovable on the piston rod. The buffer sleeve is made of thermoplastic plastic material, particularly polyphenylene sulfide, polyphenylene vinyl or fiber reinforced polyamide. An independent claim is included for a piston-piston rod unit with a laser welding seam.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Kolben-Kolbenstangen-Einheit für ein fluidtechnisches Gerät, wie ein Arbeitszylinder oder ein Stoßdämpfer, wobei der Kolben eine zentrale Durchbrechung zum Aufstecken auf die Kolbenstange besitzt, und wobei die Kolben-Kolbenstangen-Einheit wenigstens eine im fluidtechnischen Gerät zu Dämpfungszwecken einsetzbare, auf die Kolbenstange aufsteckbare Pufferhülse aufweist. Die Erfindung betrifft ferner noch eine Kolben-Kolbenstangen-Einheit.The invention relates to a method for producing a piston-piston rod unit for a fluid power device, such as a working cylinder or a shock absorber, wherein the piston has a central opening for attachment to the piston rod, and wherein the piston-piston rod unit at least one in the fluidic Applicable for damping purposes, has attachable to the piston rod buffer sleeve. The invention further relates to a piston-piston rod unit.

Eine Kolben-Kolbenstangen-Einheit dieser Art ist beispielsweise in der EP 1 503 114 A1 offenbart. Die dort beschriebene Kolben-Kolbenstangen-Einheit besitzt eine Kolbenstange, auf die ein Kolben mit einer zentralen Durchbrechung aufgesteckt und zwischen zwei axial fest mit der Kolbenstange verbundenen Halteflächen axial unbeweglich fixiert ist. Dabei ist wenigstens eine der Halteflächen von einem auf einen außengewindelosen metallischen Befestigungsabschnitt der Kolbenstange aufgesteckten, innengewindelosen metallischen Haltering gebildet, der durch eine zur Kolbenstange konzentrische Laserschweißnaht mit der Kolbenstange verschweißt ist. Der Haltering kann hierbei eine Mehrfachfunktion innehaben und so ausgebildet sein, dass er Verankerungsmittel für einen zur Kolbenstange koaxialen Pufferkolben bildet. Hierzu kann der Haltering über eine umlaufende radiale Hinterschneidung verfügen, in die sich der Pufferkolben mit einem oder mehreren hakenartigen Verankerungselementen oder anderen geeigneten Verankerungselementen einrasten lässt.A piston-piston rod unit of this type is for example in the EP 1 503 114 A1 disclosed. The piston-piston rod unit described therein has a piston rod to which a piston is fitted with a central opening and axially immovably fixed between two axially fixedly connected to the piston rod holding surfaces. In this case, at least one of the holding surfaces is formed by a screwed onto an externally threaded metallic mounting portion of the piston rod, innengewindelosen metallic retaining ring, which is welded by a concentric with the piston rod laser weld with the piston rod. The retaining ring may in this case have a multiple function and be formed so that it forms anchoring means for a piston rod coaxial with the piston. For this purpose, the retaining ring have a circumferential radial undercut, in which the buffer piston can engage with one or more hook-like anchoring elements or other suitable anchoring elements.

Aufgabe der Erfindung ist es, ein Verfahren zur Herstellung einer Kolben-Kolbenstangen-Einheit der eingangs erwähnten Art zu schaffen, mit dem sich eine Pufferhülse in einfacher und kostengünstiger Art und Weise mit der Kolbenstange verbinden lässt bzw. eine Kolben-Kolbenstangen-Einheit bereitzustellen, die gegenüber herkömmlich hergestellten Kolben-Kolbenstangen-Einheiten kostengünstiger herzustellen ist.The object of the invention is to provide a method for producing a piston-piston rod unit of the type mentioned, with which a buffer sleeve can be connected in a simple and cost-effective manner with the piston rod or to provide a piston-piston rod unit, which is cheaper to manufacture compared to conventionally manufactured piston-piston rod units.

Diese Aufgabe wird durch ein Verfahren zur Herstellung einer Kolben-Kolbenstangen-Einheit mit den Merkmalen des unabhängigen Anspruchs 1 gelöst. Weiterbildungen der Erfindung sind in den Unteransprüchen dargestellt.This object is achieved by a method for producing a piston-piston rod unit having the features of independent claim 1. Further developments of the invention are shown in the subclaims.

Das erfindungsgemäße Verfahren zur Herstellung einer Kolben-Kolbenstangen-Einheit für ein fluidtechnisches Gerät, wie ein Arbeitszylinder oder ein Stoßdämpfer, wobei der Kolben eine zentrale Durchbrechung zum Aufstecken auf die Kolbenstange besitzt, und wobei die Kolben-Kolbenstangen-Einheit wenigstens eine im fluidtechnischen Gerät zu Dämpfungszwecken einsetzbare, auf die Kolbenstange aufsteckbare Pufferhülse aufweist, umfasst folgende Schritte:

  • Aufstecken des Kolbens auf die Kolbenstange und Verbinden des Kolbens mit der Kolbenstange derart, dass der Kolben axial unbeweglich auf der Kolbenstange fixiert ist,
  • Aufstecken der Pufferhülse auf die Kolbenstange und Verbinden der Pufferhülse mit der Kolbenstange mittels Laserstrahlschweißen, derart, dass die Pufferhülse axial unbeweglich auf der Kolbenstange fixiert ist.
The inventive method for producing a piston-piston rod unit for a fluid power device, such as a working cylinder or a shock absorber, wherein the piston has a central opening for attachment to the piston rod, and wherein the piston-piston rod unit at least one in the fluid power device Applicable for damping purposes, has on the piston rod attachable buffer sleeve, comprises the following steps:
  • Placing the piston on the piston rod and connecting the piston with the piston rod such that the piston is fixed axially immovably on the piston rod,
  • Attaching the buffer sleeve to the piston rod and connecting the buffer sleeve to the piston rod by means of laser beam welding, such that the buffer sleeve is fixed axially immovably on the piston rod.

Die Pufferhülse wird also mittels Laserstrahlschweißen mit der Kolbenstange verbunden. Eine spanabhebende Bearbeitung der Kolbenstange vor der Befestigung der Pufferhülse ist also nicht mehr notwendig. Es kann ein arbeitsaufwendiger und damit kostenintensiver Bearbeitungsschritt eingespart werden. Ferner sind weitere Befestigungsmittel, wie beispielsweise der im Stand der Technik erwähnte Haltering nicht notwendig. Das Laserstrahlschweißen bzw. Laserschweißen zeichnet sich durch einen geringen, konzentrierten Energieeintrag in die Kolbenstange aus, was einen relativ geringen thermisch bedingten Verzug der Kolbenstange bewirkt. Daher ist die Maßgenauigkeit einer derart hergestellten Kolben-Kolbenstangen-Einheit relativ groß.The buffer sleeve is thus connected by means of laser beam welding to the piston rod. A machining of the piston rod before attaching the buffer sleeve is therefore no longer necessary. It can be a labor-consuming and cost-intensive processing step can be saved. Furthermore, other fastening means, such as the mentioned in the prior art retaining ring is not necessary. The laser beam welding or laser welding is characterized by a low, concentrated energy input into the piston rod, which causes a relatively small thermal distortion of the piston rod. Therefore, the dimensional accuracy of a piston-piston rod unit produced in this way is relatively large.

Bei einer Weiterbildung der Erfindung wird die Oberfläche der Kolbenstange vor dem Aufstecken der Pufferhülse an wenigstens einem Strukturierungsbereich mittels Laserbearbeitung aufgeraut und die Pufferhülse wird danach über den entstandenen Strukturierungsbereich positioniert. Durch die Laserbearbeitung der Kolbenstangen-Oberfläche entstehen mikrokleine Krater, die vorteilhaft für den Zusammenhalt zwischen der Pufferhülse und der Kolbenstange sind. Beispielsweise wird dadurch die effektive Kontaktoberfläche zwischen den beiden Bauteilen erhöht. Der wenigstens eine Strukturierungsbereich kann klein- oder großflächig ausgebildet sein. Zweckmäßigerweise ist der Strukturierungsbereich insgesamt relativ gleichmäßig, so dass eine gleichmäßig aufgeraute Oberfläche entsteht.In a further development of the invention, the surface of the piston rod is roughened before attaching the buffer sleeve to at least one structuring region by means of laser processing and the buffer sleeve is then positioned over the resulting structuring region. The laser processing of the piston rod surface creates micro-sized craters, which are advantageous for the cohesion between the buffer sleeve and the piston rod. For example, this increases the effective contact surface between the two components. The at least one patterning region can be formed on a small or large area. The structuring region is expediently relatively uniform overall, so that a uniformly roughened surface results.

In besonders bevorzugter Weise ist der Strukturierungsbereich ringförmig über den Umfang der Kolbenstange ausgebildet. Zweckmäßigerweise werden mehrere in Axialrichtung der Kolbenstange hintereinander angeordnete ringförmige Strukturierungsbereiche eingelasert. Diese ringförmigen Strukturierungsbereiche lassen sich auch als Halteringe bezeichnen, obgleich diese natürlich keine separaten Bauteile sind, wie der aus dem Stand der Technik beschriebenen Haltering.In a particularly preferred manner, the structuring region is formed annularly over the circumference of the piston rod. Advantageously, a plurality of annular structuring regions arranged one behind the other in the axial direction of the piston rod are lasered. These annular structuring regions may also be referred to as retaining rings, although these are of course not separate components, such as the retaining ring described in the prior art.

Es ist möglich, dass vor dem Aufstecken des Kolbens auch der Bereich, an dem anschließend der Kolben zu positionieren ist, mittels Laserbearbeitung aufgeraut wird.It is possible that prior to attaching the piston and the area where the piston is then to be positioned, is roughened by means of laser processing.

Bei einer Weiterbildung der Erfindung wird der Kolben ebenfalls mittels Laserstrahlschweißen mit der Kolbenstange verbunden. Es ist also möglich, dass sowohl der Kolben als auch die wenigstens eine Pufferhülse mit der Kolbenstange laserverschweißt sind.In a further development of the invention, the piston is also connected by means of laser beam welding to the piston rod. It is thus possible that both the piston and the at least one buffer sleeve are laser-welded to the piston rod.

In besonders bevorzugter Weise wird der Kolben vor dem Aufrauen der Kolbenstangen-Oberfläche für die Pufferhülsen auf die Kolbenstange aufgesteckt und vorzugsweise mit dieser verbunden. Dadurch, dass der Kolben bereits auf der Kolbenstange positioniert ist, lassen sich definierte Strukturierungsbereiche festlegen, an denen dann die Laserbearbeitung durchgeführt wird.In a particularly preferred manner, the piston is attached to the piston rod before roughening the piston rod surface for the buffer sleeves and preferably connected thereto. Due to the fact that the piston is already positioned on the piston rod, defined structuring ranges can be defined, at which the laser processing is carried out.

In besonders bevorzugter Weise wird die Pufferhülse beim Laserstrahlverschweißen mit der Kolbenstange mittels Fügekraft auf die Kolbenstangen-Oberfläche gepresst. Die Anzahl der Strukturierungsbereiche, die Ausgestaltung und die Dimensionierung sind abhängig von der Fügekraft. Ist die Fügekraft also relativ niedrig, so ist es zweckmäßig, mehrere Strukturierungsbereiche, beispielsweise mehrere hintereinander angeordnete Halteringe, auszubilden.In a particularly preferred manner, the buffer sleeve is pressed during laser beam welding to the piston rod by means of joining force on the piston rod surface. The number of structuring areas, the design and the dimensioning depend on the joining force. If the joining force is thus relatively low, it is expedient to form a plurality of structuring regions, for example a plurality of retaining rings arranged one behind the other.

In besonders bevorzugter Weise wird die Fügekraft durch das Material der Pufferhülse selbst erzeugt. Dies kann beispielsweise dadurch erzielt werden, dass der Durchmesser der Kolbenstange gegenüber dem Innendurchmesser der Pufferhülse ein Übermaß aufweist. In diesem Fall steht die Pufferhülse also unter Spannung, wenn sie auf der Kolbenstange positioniert ist.In a particularly preferred manner, the joining force is generated by the material of the buffer sleeve itself. This can be achieved, for example, in that the diameter of the piston rod has an excess compared to the inner diameter of the buffer sleeve. In this case, the buffer sleeve is thus under tension when it is positioned on the piston rod.

In besonders bevorzugter Weise besteht die Pufferhülse aus lasertransparentem Material und die Verbindung mit der Kolbenstange erfolgt mittels Laserdurchstrahlschweißen. Das Material der Pufferhülse ist in diesem Fall also für die verwendete Laserwellenlänge des Lasers transparent. Dadurch kann der Laser nahezu ungehindert durch das lasertransparente Material hindurch strahlen, wobei sich die Pufferhülse kaum erhitzt. Das Material der Kolbenstange, beispielsweise Edelstahl, wird hingegen erhitzt und gibt die Wärme an die Pufferhülse ab, wodurch das Material der Pufferhülse anschmilzt und insbesondere in den zuvor aufgerauten Kraterbereich an der Kolbenstangen-Oberfläche fließt, wodurch ein Fügeverbund entsteht.In a particularly preferred manner, the buffer sleeve made of laser-transparent material and the connection to the piston rod by means of laser transmission welding. The material of the buffer sleeve is therefore transparent in this case for the laser wavelength of the laser used. As a result, the laser can radiate through the laser-transparent material almost unhindered, whereby the buffer sleeve hardly heats up. The material of the piston rod, such as stainless steel, however, is heated and releases the heat to the buffer sleeve, whereby the material of the buffer sleeve melts and in particular flows into the previously roughened crater area on the piston rod surface, whereby a joint assembly is formed.

Bei einer Weiterbildung der Erfindung wird als Pufferhülsen-Material thermoplastisches Kunststoffmaterial verwendet. Hierfür eignet sich besonders Polyphenylensulfid (PPS), Polyphenylenvinyl (PPV) oder faserverstärktes Polyamid.In a further development of the invention is used as a buffer sleeve material thermoplastic plastic material. Polyphenylene sulfide (PPS), polyphenylene vinyl (PPV) or fiber-reinforced polyamide are particularly suitable for this purpose.

Die Erfindung betrifft ferner noch eine Kolben-Kolbenstangen-Einheit für ein fluidtechnisches Gerät wie ein Arbeitszylinder oder ein Stoßdämpfer, mit einer Kolbenstange, auf der ein mit einer zentralen Durchbrechung versehener Kolben aufgesteckt und mit der Kolbenstange derart verbunden ist, dass er axial unbeweglich fixiert ist, und mit wenigstens einer im fluidtechnischen Gerät zu Dämpfungszwecken einsetzbaren Pufferhülse, die auf die Kolbenstange aufgesteckt ist und dort mit der Kolbenstange derart verbunden ist, dass sie axial unbeweglich fixiert ist. Die erfindungsgemäße Kolben-Kolbenstangen-Einheit zeichnet sich dadurch aus, dass die Pufferhülse mittels wenigstens einer durch Laserstrahlschweißen entstandenen Laserschweißnaht mit der Kolbenstange verbunden ist.The invention further relates to a piston-piston rod unit for a fluid power device such as a working cylinder or a shock absorber, with a piston rod on which a central opening provided with a piston and connected to the piston rod such that it is fixed axially immovable , and with at least one usable in the fluid power device for damping purposes buffer sleeve, which is plugged onto the piston rod and there connected to the piston rod such that it is fixed axially immovable. The piston-piston rod unit according to the invention is characterized in that the buffer sleeve is connected to the piston rod by means of at least one laser welding seam formed by laser beam welding.

Die Pufferhülse ist also direkt mit der Kolbenstange verbunden. Weitere Befestigungsmittel für die Befestigung der Pufferhülse zu der Kolbenstange sind nicht eingesetzt.The buffer sleeve is thus connected directly to the piston rod. Other fasteners for attaching the buffer sleeve to the piston rod are not used.

Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher erläutert. Die einzige Figur der Zeichnung zeigt:

  • Einen Längsschnitt durch eine gemäß dem erfindungsgemäßen Verfahren hergestellte erfindungsgemäße Kolben-Kolbenstangen-Einheit.
A preferred embodiment of the invention is illustrated in the drawing and will be explained in more detail below. The sole figure of the drawing shows:
  • A longitudinal section through a piston-piston rod unit according to the invention produced according to the inventive method.

Die einzige Figur zeigt einen teilweise strichpunktierten Ausschnitt eines fluidtechnischen Gerätes 11, bei dem es sich exemplarisch um einen durch Fluidkraft betätigten Arbeitszylinder handelt, insbesondere um einen Pneumatikzylinder. Das fluidtechnische Gerät 11 verfügt über ein längliches Gehäuse 12, in dem ein Kolben 13 angeordnet ist, der unter Abdichtung zwei Arbeitskammern 14a, 14b voneinander abteilt. Durch gesteuerte Fluidbeaufschlagung der beiden Arbeitskammern 14a, 14b über nicht näher dargestellte Gehäusekanäle lässt sich der Kolben 13 axial verschieben. Die Bewegung des Kolbens 13 kann außerhalb des Gehäuses 12 an einer Kolbenstange 15 abgegriffen werden, die eine oder beide stirnseitigen Abschlusswände des Gehäuses 12 unter Abdichtung durchsetzt, und die mit dem Kolben 13 zu einer als Kolben-Kolbenstangen-Einheit 16 bezeichneten Baueinheit zusammengefasst ist. Die Kolbenstange 15 macht also die Bewegung des Kolbens 13 unmittelbar mit.The single FIGURE shows a partially dot-dashed section of a fluid power device 11, which is an example of a fluid operated by a power cylinder, in particular a pneumatic cylinder. The fluid power device 11 has an elongated housing 12, in which a piston 13 is arranged, which divides two working chambers 14a, 14b from each other while sealing. By controlled fluid loading of the two working chambers 14a, 14b via housing channels, not shown, the piston 13 can be moved axially. The movement of the piston 13 can be tapped outside of the housing 12 on a piston rod 15, which passes through one or both end-side end walls of the housing 12 under sealing, and with the piston 13 to a piston-piston rod unit 16 designated unit is summarized. The piston rod 15 thus makes the movement of the piston 13 directly with.

Die Kolben-Kolbenstangen-Einheit 16 kann auch bei anderen fluidtechnischen Geräten Einsatz finden, beispielsweise bei Stoßdämpfern, wo in die Kolbenstange 15 zu dämpfende Stöße eingeleitet werden.The piston-piston rod unit 16 can also be used in other fluid power devices use, for example in shock absorbers, where in the piston rod 15 to be damped shocks are initiated.

Der Kolben 13 besitzt eine zentrale Durchbrechung, mit der er auf die Kolbenstange 15 koaxial aufgesteckt ist. Die Kolbenstange 15 besteht aus Metall, beispielsweise aus Edelstahl oder Aluminium.The piston 13 has a central opening, with which it is attached to the piston rod 15 coaxially. The piston rod 15 is made of metal, for example made of stainless steel or aluminum.

Wie in der Figur gezeigt, ist der Kolben 13 mittels Laserstrahlschweißen mit der Kolbenstange 15 verbunden. Dies kann beispielsweise durch zwei in Axialrichtung der Kolbenstange 15 konzentrische Laserschweißnähte 17a, 17b erfolgen.As shown in the figure, the piston 13 is connected to the piston rod 15 by means of laser beam welding. This can be done for example by two concentric in the axial direction of the piston rod 15 laser welds 17a, 17b.

Die Kolben-Kolbenstangen-Einheit besitzt ferner wenigstens eine Pufferhülse 18, die im fluidtechnischen Gerät 11 zu Dämpfungszwecken bei der Endlagendämpfung der Kolben-Kolbenstangen-Einheit 16 eingesetzt ist.The piston-piston rod unit further has at least one buffer sleeve 18, which is used in the fluid power device 11 for damping purposes in the end position damping of the piston-piston rod unit 16.

Im vorliegenden Fall sind zwei Pufferhülsen 18 vorgesehen, die links und rechts des Kolbens 13 auf die Kolbenstange 15 aufgesteckt und dort in nachstehend noch näher erläuterter Weise mittels Lasterstrahlschweißen mit der Kolbenstange 15 verbunden sind.In the present case, two buffer sleeves 18 are provided, which are attached to the left and right of the piston 13 on the piston rod 15 and are connected there in the manner explained in more detail below by means of load beam welding to the piston rod 15.

Die Pufferhülsen 18 bestehen aus einem lasertransparenten Material, das für die eingesetzte Wellenlänge des Lasers durchlässig ist. Bei dem Pufferhülsen-Material handelt es sich um ein thermoplastisches Kunststoffmaterial, beispielsweise Polyphenylensulfid (PPS), Polyphenylenvinyl (PPV) oder faserverstärktes Polyamid, insbesondere Ultramid (Marke der Fa. BASF).The buffer sleeves 18 are made of a laser-transparent material which is permeable to the wavelength of the laser used. The buffer tube material is a thermoplastic material, for example Polyphenylene sulfide (PPS), polyphenylene vinyl (PPV) or fiber-reinforced polyamide, in particular Ultramid (trademark of BASF).

Wie in der Figur zu erkennen, ist die Oberfläche der Kolbenstange 15 an mehreren Strukturierungsbereichen 19 mittels Laserbearbeitung aufgeraut. Die Strukturierungsbereiche 19 verlaufen konzentrisch um die Kolbenstange 15 und können daher auch als Halteringe bezeichnet werden. An den Strukturierungsbereichen 19 befinden sich jeweils auch diesen zugeordnete Laserschweißnähte 20, über die die Pufferhülsen 18 in nachfolgend noch näher erläuterter Weise mit der Kolbenstange 15 laserverschweißt sind.As can be seen in the figure, the surface of the piston rod 15 is roughened on a plurality of structuring regions 19 by means of laser processing. The structuring regions 19 extend concentrically around the piston rod 15 and can therefore also be referred to as retaining rings. At the structuring regions 19 are also associated with these laser welds 20, over which the buffer sleeves 18 are laser welded in the manner explained in more detail below with the piston rod 15.

Bei der Herstellung einer beispielsweise in der Figur gezeigten Kolben-Kolbenstangen-Einheit 16 wird zunächst der Kolben 13 auf die Kolbenstange 15 gesteckt. Es ist möglich, dass der Bereich, an dem der Kolben 13 auf der Kolbenstange 15 zu positionieren ist, vor dem Aufstecken des Kolbens 13 mittels Laserbearbeitung bearbeitet wird. Nach dem Aufstecken des Kolbens 13 wird dieser mittels Laserstrahlschweißen mit der Kolbenstange 15 verbunden.In the production of a piston-piston rod unit 16, shown for example in the figure, the piston 13 is first pushed onto the piston rod 15. It is possible that the region where the piston 13 is to be positioned on the piston rod 15 is machined before attaching the piston 13 by means of laser machining. After attaching the piston 13, this is connected by means of laser beam welding to the piston rod 15.

Anschließend werden an der Oberfläche der Kolbenstange 15 die Strukturierungsbereiche 19 mittels Laserbearbeitung hergestellt. Dabei werden sogenannte ringförmige Halteringe herausgelasert, so dass in der Oberfläche der Kolbenstange 15 mikrokleine Krater entstehen. Die Strukturierungsbereiche 19 liegen links und rechts des bereits auf der Kolbenstange 15 befestigten Kolbens 13. Es können beispielsweise mehrere in Axialrichtung der Kolbenstange 15 hintereinander angeordnete Halteringe ausgebildet werden. Nach der Aufrauhung der Oberfläche werden die Pufferhülsen 18 auf die Kolbenstange 15 geschoben, bis sie mit ihrem Einschubende an den Kolben anstoßen, wodurch die Lage der Pufferhülsen 18 vorgegeben ist. Der Durchmesser der Kolbenstange 15 weist gegenüber den Innendurchmessern der Pufferhülsen 18 ein Übermaß auf, so dass sich die Pufferhülsen 18 beim Aufschieben aufweiten. Dies ist ohne Weiteres möglich, da die Pufferhülsen 18 ja wie bereits erwähnt, aus thermoplastischem Kunststoffmaterial bestehen, das elastisch nachgiebig ist.Subsequently, the structuring regions 19 are produced on the surface of the piston rod 15 by means of laser processing. In this case, so-called annular retaining rings are herausgelasert so that 15 micro-small craters arise in the surface of the piston rod. The structuring regions 19 are located on the left and on the right of the piston 13 already mounted on the piston rod 15. For example, a plurality of retaining rings arranged one behind the other in the axial direction of the piston rod 15 can be formed. After roughening the surface, the buffer sleeves 18 are pushed onto the piston rod 15 until they abut with their insertion end to the piston, whereby the position of the buffer sleeves 18 is predetermined. The diameter of the piston rod 15 has over the inner diameters of the buffer sleeves 18 an excess, so that the buffer sleeves 18 expand when pushed. This is readily possible, since the buffer sleeves 18, as already mentioned, are made of thermoplastic material that is elastically yielding.

Die Pufferhülsen 18 drücken also in ihrer aufgeschobenen Lage unter Spannung auf die Oberfläche der Kolbenstange 15. Dadurch wird eine Fügekraft erzeugt, die beim anschließenden Verbinden der Pufferhülsen 18 mit der Kolbenstange 15 genutzt wird.The buffer sleeves 18 thus press in their deferred position under tension on the surface of the piston rod 15. As a result, a joining force is generated, which is used in the subsequent connection of the buffer sleeves 18 with the piston rod 15.

Anschließend werden die Pufferhülsen 18 mittels Laserdurchstrahlschweißen mit der Kolbenstange 15 verbunden. Dabei tritt der Laserstrahl durch das lasertransparente Material der zu bearbeitenden Pufferhülse 18 hindurch und erwärmt die Kolbenstange, wobei die Wärme von der Kolbenstange auf die Pufferhülse übertragen wird. Dadurch schmilzt das Material der Pufferhülse im Kontaktbereich Kolbenstangen-Oberfläche/Pufferhülsen-Innenwandung an und fließt in den an den Halterungen ausgebildeten Kraterbereich der aufgerauten Kolbenstangen-Oberfläche hinein. Dadurch entsteht ein fester Schweißverbund zwischen der Pufferhülse 18 und der Kolbenstange 15. Der Schweißvorgang kann derart erfolgen, dass nacheinander an den ringförmigen Halteringen bzw. Strukturierungsbereichen 19 mittels eines Lasers Laserschweißnähte 20 ausgebildet werden. Es ist jedoch auch möglich, dass die beiden Pufferhülsen 18 simultan mittels zweier Laserstrahlen, die jeweils einer der Pufferhülse zugeordnet sind, mit der Kolbenstange 15 laserverschweißt werden.Subsequently, the buffer sleeves 18 are connected by means of laser transmission welding to the piston rod 15. In this case, the laser beam passes through the laser-transparent material of the buffer sleeve 18 to be processed and heats the piston rod, wherein the heat is transferred from the piston rod to the buffer sleeve. As a result, the material of the buffer sleeve melts in the contact area piston rod surface / buffer sleeve inner wall and flows into the formed on the holders crater area of the roughened piston rod surface. This results in a solid welded joint between the buffer sleeve 18 and the piston rod 15. The welding process can be carried out such that laser welding seams 20 are formed successively on the annular retaining rings or patterning regions 19 by means of a laser. However, it is also possible that the two buffer sleeves 18 are simultaneously laser-welded to the piston rod 15 by means of two laser beams, which are each associated with one of the buffer sleeve.

Claims (14)

Verfahren zur Herstellung einer Kolben-Kolbenstangen-Einheit (16) für ein fluidtechnisches Gerät (11), wie ein Arbeitszylinder oder ein Stoßdämpfer, wobei der Kolben (13) eine zentrale Durchbrechung zum Aufstecken auf die Kolbenstange (15) besitzt, und wobei die Kolben-Kolbenstangen-Einheit (16) wenigstens eine im fluidtechnischen Gerät (11) zu Dämpfungszwecken einsetzbare, auf die Kolbenstange (15) aufsteckbare Pufferhülse (18) aufweist, das Verfahren mit folgenden Schritten: - Aufstecken des Kolbens (13) auf die Kolbenstange (15) und Verbinden des Kolbens (13) mit der Kolbenstange (15) derart, dass der Kolben (13) axial unbeweglich auf der Kolbenstange (15) fixiert ist, - Aufstecken der Pufferhülse (18) auf die Kolbenstange (15) und Verbinden der Pufferhülse (18) mit der Kolbenstange (15) mittels Laserstrahlschweißen, derart, dass die Pufferhülse (18) axial unbeweglich auf der Kolbenstange (15) fixiert ist. Method for producing a piston-piston rod unit (16) for a fluid power device (11), such as a working cylinder or a shock absorber, wherein the piston (13) has a central opening for attachment to the piston rod (15), and wherein the pistons Piston rod unit (16) at least one in the fluidic device (11) can be used for damping purposes, on the piston rod (15) attachable buffer sleeve (18), the method comprising the following steps: - Placing the piston (13) on the piston rod (15) and connecting the piston (13) with the piston rod (15) such that the piston (13) is fixed axially immovably on the piston rod (15), - Attaching the buffer sleeve (18) on the piston rod (15) and connecting the buffer sleeve (18) with the piston rod (15) by means of laser beam welding, such that the buffer sleeve (18) is fixed axially immovably on the piston rod (15). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Oberfläche der Kolbenstange (15) vor dem Aufstecken der Pufferhülse (18) an wenigstens einem Strukturierungsbereich (19) mittels Laserbearbeitung aufgeraut wird und die Pufferhülse (18) danach über den entstandenen Strukturierungsbereich (19) positioniert wird.A method according to claim 1, characterized in that the surface of the piston rod (15) is roughened before attaching the buffer sleeve (18) on at least one structuring region (19) by means of laser processing and the buffer sleeve (18) is then positioned over the resulting patterning area (19). Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Strukturierungsbereich (19) ringförmig über den Umfang der Kolbenstange (15) ausgebildet wird.A method according to claim 1 or 2, characterized in that the structuring region (19) is formed annular over the circumference of the piston rod (15). Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Kolben (13) mittels Laserstrahlschweißen mit der Kolbenstange (15) verbunden wird.Method according to one of the preceding claims, characterized in that the piston (13) by means of laser beam welding to the piston rod (15) is connected. Verfahren nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass vor dem Aufrauen der Kolbenstangen-Oberfläche der Kolben (13) auf die Kolbenstange (15) aufgesteckt und vorzugsweise mit dieser verbunden wird.Method according to one of claims 2 to 4, characterized in that prior to roughening the piston rod surface of the piston (13) mounted on the piston rod (15) and is preferably connected thereto. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Pufferhülse (18) beim Laserstrahlverschweißen mit der Kolbenstange (15) mittels Fügekraft auf die Kolbenstangen-Oberfläche gepresst wird.Method according to one of the preceding claims, characterized in that the buffer sleeve (18) during laser beam welding to the piston rod (15) is pressed by means of joining force on the piston rod surface. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Fügekraft durch das Material der Pufferhülse (18) selbst erzeugt wird, insbesondere der Durchmesser der Kolbenstange (15) gegenüber dem Innendurchmesser der Pufferhülse (18) ein Übermaß aufweist.A method according to claim 6, characterized in that the joining force is generated by the material of the buffer sleeve (18) itself, in particular the diameter of the piston rod (15) relative to the inner diameter of the buffer sleeve (18) has an excess. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Pufferhülse (18) aus lasertransparentem Material besteht und die Verbindung mit der Kolbenstange (15) mittels Laserdurchstrahlschweißen erfolgt.Method according to one of the preceding claims, characterized in that the buffer sleeve (18) consists of laser-transparent material and the connection to the piston rod (15) by means of laser transmission welding. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Pufferhülse (18) aus thermoplastischen Kunststoffmaterial, insbesondere Polyphenylensulfid (PPS), Polyphenylenvinyl (PPV) oder faserverstärktem Polyamid besteht.Method according to one of the preceding claims, characterized in that the buffer sleeve (18) made of thermoplastic Plastic material, in particular polyphenylene sulfide (PPS), polyphenylene vinyl (PPV) or fiber-reinforced polyamide exists. Kolben-Kolbenstangen-Einheit für ein fluidtechnisches Gerät (12), wie ein Arbeitszylinder oder ein Stoßdämpfer, mit einer Kolbenstange (15), auf der ein mit einer zentralen Durchbrechung versehener Kolben (13) aufgesteckt und mit der Kolbenstange (15) derart verbunden ist, dass er axial unbeweglich fixiert ist, und mit wenigstens einer im fluidtechnischen Gerät zu Dämpfungszwecken einsetzbaren Pufferhülse (18), die auf die Kolbenstange (15) aufgesteckt ist und dort mit der Kolbenstange (15) derart verbunden ist, dass sie axial unbeweglich fixiert ist, dadurch gekennzeichnet, dass die Pufferhülse (18) mittels wenigstens einer durch Laserstrahlschweißen entstandenen Laserschweißnaht (20) mit der Kolbenstange (15) verbunden ist.Piston-piston rod unit for a fluid power device (12), such as a working cylinder or a shock absorber, with a piston rod (15) on which a piston provided with a central opening (13) and connected to the piston rod (15) is connected in that it is fixed in an axially immovable manner, and with at least one buffer sleeve (18) which can be inserted in the fluidic device for damping purposes, which is plugged onto the piston rod (15) and is connected there to the piston rod (15) in such a way that it is fixed axially immovably , characterized in that the buffer sleeve (18) is connected to the piston rod (15) by means of at least one laser welding seam (20) produced by laser beam welding. Kolben-Kolbenstangen-Einheit nach Anspruch 10, dadurch gekennzeichnet, dass die Kolbenstange (15) an ihrer Oberfläche wenigsten einen mittels Laserbearbeitung aufgerauten Strukturierungsbereich (19) aufweist, über dem die Pufferhülse (18) positioniert ist.Piston-piston rod unit according to claim 10, characterized in that the piston rod (15) has on its surface at least a roughened by laser processing structuring region (19), over which the buffer sleeve (18) is positioned. Kolben-Kolbenstangen-Einheit nach Anspruch 11, dadurch gekennzeichnet, dass der Strukturierungsbereich (19) ringförmig über den Umfang der Kolbenstange (15) ausgebildet ist.Piston-piston rod unit according to claim 11, characterized in that the structuring region (19) is formed annularly over the circumference of the piston rod (15). Kolben-Kolbenstangen-Einheit nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass die Pufferhülse (18) aus lasertransparentem Material besteht.Piston-piston rod unit according to one of claims 10 to 12, characterized in that the buffer sleeve (18) consists of laser-transparent material. Kolben-Kolbenstangen-Einheit nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass die Pufferhülse (18) aus thermoplastischen Kunststoffmaterial, insbesondere Polyphenylensulfid (PPS), Polyphenylenvinyl (PPV) oder faserverstärktem Polyamid besteht.Piston-piston rod unit according to one of claims 10 to 13, characterized in that the buffer sleeve (18) made thermoplastic plastic material, in particular polyphenylene sulfide (PPS), polyphenylene vinyl (PPV) or fiber-reinforced polyamide.
EP12006232.8A 2012-09-04 2012-09-04 Method for producing a piston-piston rod unit and piston-piston rod unit Active EP2703653B1 (en)

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WO2014183835A1 (en) * 2013-05-16 2014-11-20 Festo Ag & Co. Kg Drive unit of a fluid-actuated linear drive and method for the production thereof
US9995323B2 (en) 2013-05-16 2018-06-12 Festo Ag & Co., Kg Drive unit of a fluid-actuated linear drive and method for its manufacture
EP3133298A1 (en) * 2015-08-21 2017-02-22 Crompton Technology Group Limited Connector
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CN108266425A (en) * 2017-11-14 2018-07-10 徐州永佳液压设备有限公司 A kind of bimetal structure piston rod and its processing method
CN108266425B (en) * 2017-11-14 2024-01-09 徐州永佳液压设备有限公司 Double-metal-structure piston rod and processing method thereof

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