EP2703653A1 - Procédé de fabrication d'une unité piston-tige de piston et unité piston-tige de piston - Google Patents

Procédé de fabrication d'une unité piston-tige de piston et unité piston-tige de piston 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
Authority
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
Other languages
German (de)
English (en)
Other versions
EP2703653B1 (fr
Inventor
Tobias Jene
Werner Sauer
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.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
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 Festo SE and Co KG filed Critical Festo SE and Co KG
Priority to EP12006232.8A priority Critical patent/EP2703653B1/fr
Priority to CN201310491210.0A priority patent/CN103671907B/zh
Publication of EP2703653A1 publication Critical patent/EP2703653A1/fr
Application granted granted Critical
Publication of EP2703653B1 publication Critical patent/EP2703653B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Laser Beam Processing (AREA)
  • Actuator (AREA)
EP12006232.8A 2012-09-04 2012-09-04 Procédé de fabrication d'une unité piston-tige de piston et unité piston-tige de piston Not-in-force EP2703653B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12006232.8A EP2703653B1 (fr) 2012-09-04 2012-09-04 Procédé de fabrication d'une unité piston-tige de piston et unité piston-tige de piston
CN201310491210.0A CN103671907B (zh) 2012-09-04 2013-09-04 用于制造活塞-活塞杆组件的方法及活塞-活塞杆组件

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12006232.8A EP2703653B1 (fr) 2012-09-04 2012-09-04 Procédé de fabrication d'une unité piston-tige de piston et unité piston-tige de piston

Publications (2)

Publication Number Publication Date
EP2703653A1 true EP2703653A1 (fr) 2014-03-05
EP2703653B1 EP2703653B1 (fr) 2017-04-12

Family

ID=46924200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12006232.8A Not-in-force EP2703653B1 (fr) 2012-09-04 2012-09-04 Procédé de fabrication d'une unité piston-tige de piston et unité piston-tige de piston

Country Status (2)

Country Link
EP (1) EP2703653B1 (fr)
CN (1) CN103671907B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014183835A1 (fr) * 2013-05-16 2014-11-20 Festo Ag & Co. Kg Unité d'entraînement d'un entraînement linéaire actionné par un fluide et procédé pour sa fabrication
EP3133298A1 (fr) * 2015-08-21 2017-02-22 Crompton Technology Group Limited Connecteur
CN108266425A (zh) * 2017-11-14 2018-07-10 徐州永佳液压设备有限公司 一种双金属结构活塞杆及其加工方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6598083B2 (ja) * 2016-12-06 2019-10-30 Ｓｍｃ株式会社 ピストン組立体及び流体圧装置
CN112524048A (zh) * 2019-09-18 2021-03-19 广东德昌电机有限公司 液体泵

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315458A1 (de) * 1993-05-10 1994-11-24 Fichtel & Sachs Ag Ventil für einen hydraulischen Teleskop-Schwingungsdämpfer
EP1503114A1 (fr) 2003-07-26 2005-02-02 Festo AG & Co Assemblage d'une tige de piston au piston

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0359750A1 (fr) * 1987-04-07 1990-03-28 SUNDHOLM, Göran Verin
ES2115429B1 (es) * 1993-05-10 1999-02-16 Fichtel & Sachs Ag Valvula para un amortiguador de vibraciones telescopico hidraulico.
CN201297378Y (zh) * 2008-11-08 2009-08-26 王万法 活塞缸活塞杆

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315458A1 (de) * 1993-05-10 1994-11-24 Fichtel & Sachs Ag Ventil für einen hydraulischen Teleskop-Schwingungsdämpfer
EP1503114A1 (fr) 2003-07-26 2005-02-02 Festo AG & Co Assemblage d'une tige de piston au piston

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014183835A1 (fr) * 2013-05-16 2014-11-20 Festo Ag & Co. Kg Unité d'entraînement d'un entraînement linéaire actionné par un fluide et procédé pour sa fabrication
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 (fr) * 2015-08-21 2017-02-22 Crompton Technology Group Limited Connecteur
US10612568B2 (en) 2015-08-21 2020-04-07 Crompton Technology Group Limited Connector
CN108266425A (zh) * 2017-11-14 2018-07-10 徐州永佳液压设备有限公司 一种双金属结构活塞杆及其加工方法
CN108266425B (zh) * 2017-11-14 2024-01-09 徐州永佳液压设备有限公司 一种双金属结构活塞杆及其加工方法

Also Published As

Publication number Publication date
EP2703653B1 (fr) 2017-04-12
CN103671907A (zh) 2014-03-26
CN103671907B (zh) 2018-07-20

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