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WO2006063581A1 - Tige de piston - Google Patents

Tige de piston Download PDF

Info

Publication number
WO2006063581A1
WO2006063581A1 PCT/DE2005/002270 DE2005002270W WO2006063581A1 WO 2006063581 A1 WO2006063581 A1 WO 2006063581A1 DE 2005002270 W DE2005002270 W DE 2005002270W WO 2006063581 A1 WO2006063581 A1 WO 2006063581A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston rod
cover layer
rod according
microns
layer
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.)
Ceased
Application number
PCT/DE2005/002270
Other languages
German (de)
English (en)
Inventor
Martinus Van Der Heijden
Antoni Bielderman
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.)
Bosch Rexroth AG
Original Assignee
Bosch Rexroth 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 Bosch Rexroth AG filed Critical Bosch Rexroth AG
Priority to DE112005002958T priority Critical patent/DE112005002958A5/de
Publication of WO2006063581A1 publication Critical patent/WO2006063581A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
    • 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
    • F15B15/1457—Piston rods
    • 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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2846—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using detection of markings, e.g. markings on the piston rod

Definitions

  • the invention relates to a piston rod according to the preamble of patent claim 1.
  • Hydraulic cylinder piston rods which are used near water or in the water in industry, off-shore, bridges, and locks, are exposed to aggressive environmental conditions requiring special piston rod corrosion protection, usually made of ordinary carbon steel do.
  • piston rods are provided with a metallic layer of chromium or a nickel-chromium alloy.
  • a metallic layer is chemically susceptible in an aggressive environment. It occurs corrosion and in particular so-called pitting, which makes the piston rod unusable after some time.
  • the object of the present invention is to provide a piston rod for a hydraulic cylinder, which has a cover layer with high corrosion resistance and low brittleness.
  • a ceramic covering layer of a mixture of aluminum oxide and zirconium oxide is applied to a metallic adhesive layer of a piston rod of a hydraulic cylinder.
  • Zirconia has the advantage that it is a non-conductor and thus the pitting is suppressed.
  • a pure layer of zirconium oxide is not very abrasion-resistant and must be sprayed tightly because, because of the high melting temperature, the application is made more difficult.
  • the abrasion resistance is increased, while at the same time by the zirconia, the brittleness of alumina is lowered.
  • the alumina reduces the melting temperature of the zirconia, so that the mixture can be applied more densely, especially in plasma spraying.
  • the percentage of pores in the volume of the cover layer is very low, which also leads to increased corrosion protection. Due to the high freedom from pores, a very low surface roughness can also be achieved so that the wear on the piston rod seal of the hydraulic cylinder is very low.
  • a particularly good cover layer can be achieved if the proportion of zirconium oxide is at least 20 percent by weight and not more than 50 percent by weight of the mixture.
  • an additional material of the cover layer can be added.
  • the additional material may be, for example, titanium oxide whose tendency to form corrosion is virtually eliminated with a correspondingly reduced percentage by weight.
  • the additional material has a particle size of at most 150 microns.
  • the layer thickness of the cover layer can be substantially increased without the risk of cracks forming in the cover layer during manufacture. This is based on the toughness of the mixture, which keeps the internal stresses occurring within the cover layer low even in the case of a continuous or abrupt change in the layer thickness, and thus in particular prevents cracking in the transitions to a different layer thickness.
  • the cover layer is applied in a layer thickness of about 150 microns to about 1000 microns.
  • the layer thickness of the adhesive layer is from about 10 microns up to 100 microns.
  • a profile for a displacement measuring system is integrated in the piston rod, so that the respective piston stroke is easily detectable.
  • the cover layer is ground off in such a way that a smooth surface is formed in which the profile is not shown.
  • FIGURE shows a longitudinal section through a portion of a piston rod according to the invention.
  • the piston rod 2 according to the invention of a hydraulic cylinder has a base body 4, in which a plurality of transversely to the longitudinal direction extending evenly spaced transverse grooves 6 are introduced. During a stroke of the piston rod 2, a magnetic field is generated by the transverse grooves 6, the changes of which can be detected by a displacement transducer 8.
  • the main body 4 is preferably made of ordinary carbon steel and coated with a metallic adhesive layer 10 made of a nickel-chromium alloy.
  • the adhesive layer 10 follows the course of the surface of the base body 4 and forms the transverse grooves 6.
  • the adhesion layer 10 is applied in a layer thickness of about 10 microns to about 100 microns.
  • a ceramic cover layer 12 is applied, which consists of a proportion of aluminum oxide (AI2O3) and a balance of 20 to 50 weight percent of zirconium oxide (ZrC> 2).
  • zirconium oxide ZrC> 2
  • TiC> 2 titanium oxide with a maximum particle size of 150 microns is also admixed.
  • the cover layer 12 is in
  • Sprayed plasma spraying with a layer thickness of about 150 microns up to 1000 microns.
  • an arc burning in a nozzle heats an inert gas stream of, for example, argon, nitrogen or helium to about 15,000 degrees Celsius, which leads to cleavage of the molecular gas and partial ionization of the atoms.
  • the gas increases sharply and flows out of the nozzle at high speed.
  • the flow velocity of the plasma jet can be close to the speed of sound.
  • ceramic cover material for forming the cover layer 12 is injected in powder form with the aid of a carrier gas. The particles are in the plasma stream for about 0.5 ms.
  • the transverse grooves 6 are also visible in their surface 14. However, since the sprayed covering layer 12 is relatively uneven, it is ground down until a completely flat, smooth surface forms above the base body 4 the transverse grooves 6 are no longer visible. Accordingly, the depth of the ablation is greater than the depth of the transverse grooves. 6
  • a piston rod for a hydraulic cylinder with a metallic base body having an adhesive layer, on which a ceramic cover layer of a mixture of aluminum oxide and zirconium oxide is applied.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne une tige de piston pour vérin hydraulique comprenant un corps de base métallique qui présente une couche autocollante sur laquelle est appliquée une couche de couverture céramique à base d'un mélange d'oxyde d'aluminium et d'oxyde de zircon.
PCT/DE2005/002270 2004-12-17 2005-12-16 Tige de piston Ceased WO2006063581A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112005002958T DE112005002958A5 (de) 2004-12-17 2005-12-16 Kolbenstange

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004060955.1 2004-12-17
DE102004060955 2004-12-17

Publications (1)

Publication Number Publication Date
WO2006063581A1 true WO2006063581A1 (fr) 2006-06-22

Family

ID=35994679

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2005/002270 Ceased WO2006063581A1 (fr) 2004-12-17 2005-12-16 Tige de piston

Country Status (2)

Country Link
DE (1) DE112005002958A5 (fr)
WO (1) WO2006063581A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107387751A (zh) * 2017-08-25 2017-11-24 常州液压成套设备厂有限公司 耐腐蚀的陶瓷活塞杆
CN118408033A (zh) * 2024-04-24 2024-07-30 江苏武进液压启闭机有限公司 一种轴向位移测量式激光熔覆活塞杆及其制备工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4443036A1 (de) * 1994-12-02 1996-06-05 Noell Gmbh Schutzschicht
JP2000355752A (ja) * 1999-06-16 2000-12-26 Nippon Steel Hardfacing Co Ltd 可動部品の表面に適用されるセラミック溶射皮膜
US20040155800A1 (en) * 2001-04-23 2004-08-12 Leo Ymker Hydraulic cylinder with a measuring system for determining the absolute position of the piston rod relative to a reference point

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4443036A1 (de) * 1994-12-02 1996-06-05 Noell Gmbh Schutzschicht
JP2000355752A (ja) * 1999-06-16 2000-12-26 Nippon Steel Hardfacing Co Ltd 可動部品の表面に適用されるセラミック溶射皮膜
US20040155800A1 (en) * 2001-04-23 2004-08-12 Leo Ymker Hydraulic cylinder with a measuring system for determining the absolute position of the piston rod relative to a reference point

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 15 6 April 2001 (2001-04-06) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107387751A (zh) * 2017-08-25 2017-11-24 常州液压成套设备厂有限公司 耐腐蚀的陶瓷活塞杆
CN118408033A (zh) * 2024-04-24 2024-07-30 江苏武进液压启闭机有限公司 一种轴向位移测量式激光熔覆活塞杆及其制备工艺

Also Published As

Publication number Publication date
DE112005002958A5 (de) 2007-08-30

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