WO2014184291A2 - Élément structural comprenant au moins deux parties soudées ensemble - Google Patents

Élément structural comprenant au moins deux parties soudées ensemble Download PDF

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Publication number
WO2014184291A2
WO2014184291A2 PCT/EP2014/059940 EP2014059940W WO2014184291A2 WO 2014184291 A2 WO2014184291 A2 WO 2014184291A2 EP 2014059940 W EP2014059940 W EP 2014059940W WO 2014184291 A2 WO2014184291 A2 WO 2014184291A2
Authority
WO
WIPO (PCT)
Prior art keywords
weld
weld seam
root
cylinder
narrowed
Prior art date
Application number
PCT/EP2014/059940
Other languages
German (de)
English (en)
Other versions
WO2014184291A3 (fr
Inventor
Mykola Oleksyuk
Zhiming Chen
Original Assignee
Schwing Gmbh
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=50778430&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2014184291(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Schwing Gmbh filed Critical Schwing Gmbh
Publication of WO2014184291A2 publication Critical patent/WO2014184291A2/fr
Publication of WO2014184291A3 publication Critical patent/WO2014184291A3/fr

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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/12—Connection to driving members with piston-rods, e.g. rigid connections
    • 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
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • B23K33/004—Filling of continuous seams
    • B23K33/006—Filling of continuous seams for cylindrical workpieces
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/235—Preliminary treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • 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
    • F15B15/1438—Cylinder to end cap assemblies
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general

Definitions

  • the invention relates to a component having at least two parts welded together.
  • weld seams must withstand high static and / or dynamic loads in many systems or devices. This applies, for example, to hydraulic cylinders of concrete pumps, in particular hydraulic cylinders, which are subjected to a high pressure (in some cases over 350 bar).
  • the weld between the cylinder bottom and the cylinder tube of the hydraulic cylinder is exposed in many cases high static and / or dynamic stresses. It is known that the weld is usually claimed particularly strong in the area of its weld root.
  • the weld root is a weak point, which may be due to the geometry of the weld (notch effect), for example. A binding error or a time-forming crack in the weld root can lead to the failure of the entire weld.
  • mechanical post-processing attempts to make the weld more loadable, particularly by removing overhanging portions of the weld root, thereby eliminating the geometric notch.
  • the post-processing means additional effort and costs.
  • An alternative to this is to design the weld for stronger loads than the actual loads occurring.
  • a thicker weld usually requires larger material thicknesses of the components to be joined, at least in the region of the weld seam. This means a higher (material) effort, a higher energy consumption, higher costs and a higher weight of the components.
  • DE 1 900 951 A shows a welded connection between a cylinder head and a cylinder wall of a hydraulic cylinder, in which the weld is in a deep circumferential groove with diverging side walls and an arcuate bottom, wherein the circumferential groove is introduced into the solid material of the cylinder head.
  • the weld is in a deep circumferential groove with diverging side walls and an arcuate bottom, wherein the circumferential groove is introduced into the solid material of the cylinder head.
  • one of the side walls is formed by the cylinder head and the cylinder wall.
  • the circumferential groove extends further inward than the cylindrical surface of the cylinder head, on which the cylinder head and the cylinder wall come into contact with each other.
  • the weld root can also be subjected to pressure when the hydraulic cylinder is loaded, which leads to a shearing stress within the weld seam. This causes a lower stress load per unit area.
  • the weld is introduced in three or more steps in the circumferential groove,
  • the object of the invention is to provide a welded component which has good strength, in particular under dynamic load. At the same time the production should be as simple and inexpensive. This object is achieved by the invention by a component according to claim 1.
  • An inventive component is substantially rotationally symmetrical, ie formed symmetrically about a central longitudinal axis and has a substantially cylindrical wall, consists of at least two strig ßten parts and has at least one first part with a second part connecting weld having a predetermined depth and has a weld root.
  • a narrowed web is formed on the first part and / or on the second part in a region adjacent to the welding seam region of the cylindrical wall, wherein the wall thickness of the first or second part in the narrowed web is smaller than the depth of the weld.
  • the stress in the weld root is reduced.
  • the service life of an inventively designed hydraulic cylinder or the welded joint can be increased, estimated by at least 100%.
  • a static and / or dynamic load, in particular due to changing pressures or high pressure peaks of a hydraulic fluid, can be absorbed in a material-saving manner.
  • a cost-effective production can be carried out, in particular with less material or inexpensive material.
  • a component is to be understood as meaning any component which has to withstand high static and / or dynamic loads, the loads being transmitted at least partially through the welded connection.
  • weld root (or root) for short is understood to be the region of the weld in which the weld seam or a groove in which the weld seam is provided is tapered.
  • the weld root usually represents the bottom area of the weld. In the area of the root, the least amount of welding material is present between the components to be joined.
  • a narrowed web is understood to mean a material taper, constriction or the like which is formed by a section of reduced wall thickness of the cylindrical wall in relation to the wall thickness in adjacent sections of the wall.
  • the region adjoining the weld seam is that region of the cylindrical wall which forms the cylindrical wall concerned part over which the power flow is introduced into the weld. This area can be located, for example, within a distance from the weld seam that corresponds at most to 10 times, preferably at most 5 times, more preferably at most 3 times the maximum width of the weld seam.
  • the invention is, as already mentioned, especially for welded joints in hydraulic cylinders.
  • the first part is a cylinder tube of a hydraulic cylinder
  • the second part is a cylinder bottom of the hydraulic cylinder.
  • the first part may be a reciprocating rod of a hydraulic cylinder
  • the second part may be a rod end of the hydraulic cylinder.
  • the first or second part in the region of the narrowed web has an inner diameter which is greater than the inner diameter of the first or second part outside the narrowed web.
  • the narrowed web has an inner circumferential surface, which is arranged at least partially further out than the root of the weld. The root is thus arranged further inside than the inner circumferential surface of the narrowed web.
  • the narrowed land is provided on the second part, i. at the cylinder bottom or at the rod end. In other words, the narrowed web is seen from the first part beyond the welded joint.
  • the weld joint is formed as a single circumferential weld.
  • the wall thickness of the first or second part in the region of the narrowed web is approximately 75-95% of the weld depth
  • the narrowed web is formed by a milled recess or by an undercut.
  • a milled recess or an undercut provides the advantage of a simple and inexpensive and low-voltage design of the web.
  • the narrowed web or the recess is formed chamfered.
  • the narrowed web or the recess is particularly preferably formed so that the wall thickness decreases in this area in the direction of the weld.
  • the web is beveled by about 5-25 °, preferably by about 10-20 °, more preferably by about 14 °.
  • the first or second part has a projection which overlaps the weld seam (a so-called weld pool lock), wherein the projection preferably overlaps the weld seam on the inside of the weld root.
  • the weld pool on the one hand has the function to seal off the weld against the interior of the cylinder so that no weld metal can penetrate the cylinder during the welding process, on the other hand, the extension has a centering effect during assembly before the welding process.
  • the component has two narrowed webs adjacent to the weld seam, wherein in each case a narrowed web is provided on each of the two parts.
  • Figure 1 is a sectional side view of a schematic representation of a hydraulic cylinder having a weld in the region of a cylinder base or in the region of a rod head;
  • FIG. 2a in a detailed view according to the indicated in Fig. 1 detail A is a schematic Representation of a weld according to the prior art
  • FIG. 2b shows in a further detail view according to the detail A indicated in FIG. 1 a 5 schematic representation of a processed weld seam according to the prior art
  • FIG. 3 shows, in a detailed view according to detail A indicated in FIG. 1, a schematic representation of a weld seam according to a first exemplary embodiment of the invention
  • FIG. 4 shows, in a detail view according to detail A indicated in FIG. 1, a schematic representation of a weld seam according to a second exemplary embodiment of the invention
  • FIG. 5 shows, in a detail view according to detail A indicated in FIG. 1, a schematic representation of a weld seam according to a third exemplary embodiment of the invention
  • FIG. 6 shows in a detail view according to the detail A indicated in FIG. 1 a schematic representation of a weld seam according to a fourth exemplary embodiment of the invention.
  • FIG. 7 shows in a detail view according to the detail A indicated in FIG. 1 a schematic representation of a weld seam according to a fifth exemplary embodiment of the invention.
  • FIG. 8 shows in a detailed view according to the detail A indicated in FIG.
  • a hydraulic cylinder 1 which has a cylinder tube 2 and a piston rod 4 arranged therein.
  • the cylinder tube 2 is connected by means of a weld 10 'with a cylinder bottom 3, and the Hubkolbenstange 4 is connected by means of a weld 10' with a rod head 5.
  • the hydraulic cylinder 1 extends along a central longitudinal axis M.
  • Fig. 2a shows the arrangement and structure of the weld 10 'according to the prior art.
  • the cylinder tube 2 has a wall thickness t, and the weld seam 10 'is provided on an end face of the cylinder tube 2 and formed over the entire depth or wall thickness t of the cylinder tube 2.
  • the weld 10 ' has a weld root 1 1', which is arranged in a region in which the cylinder bottom 3 is adjacent to the cylinder tube 2.
  • Fig. 2b a variant of the welded connection according to the prior art is shown.
  • the weld 10 ' is slightly spaced from the cylinder bottom 3, i. arranged in the region of the wall of the hydraulic cylinder 1.
  • the weld root 1 1 'in the region of the inner circumferential surface 12 a of the cylinder tube 2 is arranged.
  • the inner circumferential surface 12a, 12b of the cylinder tube 2 has been machined after Verschwei Shen by material removal, so that the wall thickness t of the cylinder tube 2 after machining is smaller.
  • the weld root 1 1 ' is less pointed in this case after machining. It is flattened by the machining, so that less voltage peaks arise.
  • Fig. 3 the weld 10 with welding root 1 1 is shown, which is arranged between the cylinder tube 2 (first part) and the cylinder bottom 3 (second part).
  • the first part 2 has an inner diameter D and a wall thickness t
  • the second part 3 has a cylinder portion 3a, 5a on which has an inner diameter D1 and a wall thickness ti.
  • D1> D and ti ⁇ t the following size ratios apply: D1> D and ti ⁇ t.
  • the cylinder portion 3a, 5a which forms part of the cylindrical wall of the hydraulic cylinder 1, is designed in sections as a narrowed web 7, which has a wall thickness which is smaller than the thickness ts of the welded joint 10, ie smaller than the depth t s of the weld 10.
  • the narrowed web 7 may also be referred to as a recess or undercut which is introduced, for example by means of milling or turning.
  • a weld root 1 1 overlapping extension 3.1, 5.1 is also provided on the cylinder portion 3a, 5a.
  • the undercut 7 has a side wall 7.1, which merges into the extension 3.1, 5.1.
  • the side wall 7.1 is formed at least approximately parallel to the side wall of the groove for the weld 10.
  • the wall thickness t1 smaller than the wall thickness t and the thickness t s of the weld 10 is selected, according to the invention, the power flow over the weld root 1 1 can be reduced. It is important that the narrowed web 7 is formed on the cylindrical wall, that is not on the left in Fig. 3 bottom wall of the cylinder, which is perpendicular to the cylindrical wall. Thus, the longitudinal extension of the web 7 is substantially parallel to the power flow.
  • FIG. 4 shows a variant in which the wall thickness ti is approximately equal to the thickness t s of the weld seam 10 or the wall thickness t.
  • FIG. 7 shows a variant in which, on both sides of the weld seam 10, a narrowed web 7 is provided in connection with an extension 3.1, 5.1.
  • the force flow is indicated by K, which is narrowed by both narrowed webs 7 and at least approximately parallel to the outer and inner circumferential surface of the first part 2, 4 and second part 3, 5 runs.
  • a variant is shown, in which the narrowed web 7 is formed chamfered. This can reduce the risk of breakage.
  • the narrowed web 7 is formed so that the wall thickness t 2 decreases in this area in the direction of the weld 10.
  • the narrowed web 7 has, on the side facing away from the weld seam 10, an inner diameter D a and a side facing the weld seam 10 on an inner diameter D z , wherein the diameter D a ⁇ D z .
  • D2 inner dimension in particular inner diameter of the first part in the region of the narrowed web t wall thickness of the first part, eg a cylinder wall or a

Abstract

Pour des éléments structuraux dynamiquement sollicités, en particulier des cylindres hydrauliques, qui présentent au moins un cordon de soudure, une fatigue du cordon de soudure peut survenir avec le temps ainsi qu'une perte de résistance allant de pair avec celle-ci, en particulier quand la racine du cordon de soudure est fortement sollicitée. Des causes fréquentes de la défaillance matérielle sont, par exemple, des fissures très fines dans la région de la racine. Pour améliorer la résistance d'éléments soudés, à symétrie de rotation, selon l'invention un pont (7) rétréci est formé sur une première partie (2; 4) et/ou sur une deuxième partie (3; 5) de l'élément qui sont reliées ensemble par le cordon de soudure (10), dans une région contiguë au cordon de soudure (10), l'épaisseur de paroi (t1, t2) de la première ou de la deuxième partie (2; 4, 3; 5) dans la région du pont (7) rétréci étant plus petite que l'épaisseur (ts) du cordon de soudure (10). Le flux de force peut de ce fait être guidé en partie à côté de la racine (11) de sorte que la soudure (10) est moins fortement sollicitée.
PCT/EP2014/059940 2013-05-16 2014-05-15 Élément structural comprenant au moins deux parties soudées ensemble WO2014184291A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013008351.6A DE102013008351B9 (de) 2013-05-16 2013-05-16 Bauteil mit mindestens zwei miteinander verschweißten Teilen
DE102013008351.6 2013-05-16

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WO2014184291A2 true WO2014184291A2 (fr) 2014-11-20
WO2014184291A3 WO2014184291A3 (fr) 2015-01-08

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WO (1) WO2014184291A2 (fr)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO2017183561A1 (fr) * 2016-04-18 2017-10-26 Ｋｙｂ株式会社 Équipement résistant à la pression et cylindre à pression hydraulique
JP2017194088A (ja) * 2016-04-18 2017-10-26 Ｋｙｂ株式会社 耐圧機器及び流体圧シリンダ
WO2019069797A1 (fr) * 2017-10-05 2019-04-11 Ｋｙｂ株式会社 Instrument de résistance à la pression et cylindre à pression de fluide

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ITUA20164077A1 (it) * 2016-06-03 2017-12-03 Ognibene Power Spa Metodo di assemblaggio di un gruppo cilindro-pistone e gruppo cilindro-pistone cosi’ ottenuto
US10697479B1 (en) 2017-06-09 2020-06-30 JARP Industries, Inc. Pressure vessel and method of welding a pressure vessel sidewall and end cap together
DE102019108451B3 (de) 2019-04-01 2020-07-02 Schwing Gmbh Kolbenstangen-Einheit, Hydraulikzylinder und Knickmast
DE102019121884A1 (de) * 2019-08-14 2021-02-18 Schwing Gmbh Kolbenstangen-Einheit, Hydraulikzylinder und Knickmast

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
WO2017183561A1 (fr) * 2016-04-18 2017-10-26 Ｋｙｂ株式会社 Équipement résistant à la pression et cylindre à pression hydraulique
JP2017194088A (ja) * 2016-04-18 2017-10-26 Ｋｙｂ株式会社 耐圧機器及び流体圧シリンダ
US20190128291A1 (en) * 2016-04-18 2019-05-02 Kyb Corporation Pressure resistant apparatus and fluid pressure cylinder
WO2019069797A1 (fr) * 2017-10-05 2019-04-11 Ｋｙｂ株式会社 Instrument de résistance à la pression et cylindre à pression de fluide
JP2019063853A (ja) * 2017-10-05 2019-04-25 Ｋｙｂ株式会社 耐圧機器及び流体圧シリンダ
CN111051709A (zh) * 2017-10-05 2020-04-21 Ｋｙｂ株式会社 耐压设备及流体压缸
DE112018004418T5 (de) 2017-10-05 2020-05-20 Kyb Corporation Druck-feste Vorrichtung und Fluid-Druck-Zylinder
US11174881B2 (en) 2017-10-05 2021-11-16 Kyb Corporation Pressure resistant device and fluid pressure cylinder
CN111051709B (zh) * 2017-10-05 2021-12-21 Ｋｙｂ株式会社 耐压设备及流体压缸

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Publication number Publication date
DE102013008351B3 (de) 2014-06-12
WO2014184291A3 (fr) 2015-01-08
DE102013008351B9 (de) 2014-10-02

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