EP2738779A1 - Schweißverfahren für Aktuator für Hydraulikventile - Google Patents

Schweißverfahren für Aktuator für Hydraulikventile Download PDF

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Publication number
EP2738779A1
EP2738779A1 EP20130190698 EP13190698A EP2738779A1 EP 2738779 A1 EP2738779 A1 EP 2738779A1 EP 20130190698 EP20130190698 EP 20130190698 EP 13190698 A EP13190698 A EP 13190698A EP 2738779 A1 EP2738779 A1 EP 2738779A1
Authority
EP
European Patent Office
Prior art keywords
amagnetic
fixed core
welding
sliding jacket
processed
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
EP20130190698
Other languages
English (en)
French (fr)
Other versions
EP2738779B1 (de
Inventor
Eugenio Colombo
Davide Ives Davoli
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.)
Nixa Srl Windings & Coils
Original Assignee
Nixa Srl Windings & Coils
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 Nixa Srl Windings & Coils filed Critical Nixa Srl Windings & Coils
Priority to PL13190698T priority Critical patent/PL2738779T3/pl
Publication of EP2738779A1 publication Critical patent/EP2738779A1/de
Application granted granted Critical
Publication of EP2738779B1 publication Critical patent/EP2738779B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/127—Assembling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1607—Armatures entering the winding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/081—Magnetic constructions
    • H01F2007/085—Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material

Definitions

  • the present invention relates to a welding process for an actuator for hydraulic valves.
  • electrically-controlled valves are normally used for switching mechanical components.
  • the basic components are a coil, with the function of transforming an electric current into a magnetic field, a coil plate, with the function of guiding the flow lines of the magnetic field, and an electric actuator (or sleeve) which transforms the magnetic field into a force exerted on a mobile component (mobile core) subject to linear movement; by means of the travel of the mobile core, a change in the status of the hydraulic system is obtained.
  • the welding process in question relates in particular to realisation of an electric actuator of which the principal requirements are transforming the magnetic field of the coil into a force as a function of the distance of the fixed core from the mobile core and containing the pressurised hydraulic fluid, of which the flow is regulated by the hydraulic valve.
  • actuators have a widespread use, for example in ON-OFF valves or proportional valves.
  • the principal components of the electric actuator are a fixed core, which polarises if subjected to a magnetic field generated by a coil, a mobile core, which is attracted with a force towards the polarised fixed core, a sliding jacket, inside which the mobile core slides, and an amagnetic part which realises the mechanical connection between the fixed core and the sliding jacket.
  • the force acting on the fixed core depends on its distance (air gap) from the fixed core. Creation of a polar cone, with a characteristic shape on the fixed core, and, in certain cases, also on the mobile core, allows the characteristic typical force towards the sleeve to be changed.
  • the various parts of the sleeve of an actuator to be connected to each other are placed alongside each other and welded, in the contact zones between the fixed core and the amagnetic part and the amagnetic part and the sliding jacket, using various welding methods; for example, laser welding, TIG welding and braze welding are used.
  • a method is also used consisting in a bath of amagnetic material which performs the dual function of welding and an amagnetic spacing element.
  • the welding methods used to obtain the sleeve must allow optimal use of the magnetic sections of the actuator without dispersion of the work areas, must not deform the polar cone or the sliding jacket and must allow certain determination of the length of the amagnetic part. These methods must also be as simple and rapid as possible and allow inexpensive embodiment.
  • the object of the present invention is providing a method which overcomes all the problems of the prior art.
  • An advantage of the present invention is providing an inexpensive and easily and safely repeatable method.
  • the welding process in question is used to realise actuators for hydraulic valves, and, in particular, for realisation of the sleeve 1 of said actuators.
  • sleeves normally cylindrical, which comprise a fixed core 2 provided at its end with a polar cone 3; the sleeve also comprises a mobile core 4 which is sliding inside a sliding jacket 5 and may be made to slide following a command which generates a magnetic field which causes attraction of the mobile core by the fixed core.
  • the sliding jacket has the primary function of containing the pressurised hydraulic fluid.
  • the sleeve also comprises an amagnetic part 6 which realises the mechanical connection between the fixed core and the sliding jacket and which also realises magnetic isolation between the fixed core and the sliding jacket, so that the magnetic field is forced to attract the mobile core 4 and does not discharge through the sliding jacket 5.
  • An electric coil 8 is also envisaged, containing in a metal plate 9.
  • the process in question envisages a first welding step performed to anchor the fixed core to the amagnetic part.
  • Both these elements have a cylindrical shape; the fixed core is a full cylinder, whereas the amagnetic part is realised by means of a ring of amagnetic material having substantially the same outer diameter of the fixed core; the outer diameter of the amagnetic part is also substantially equal to the outer diameter of the sliding jacket.
  • This first welding step is performed with the known method of braze welding and allows a semi-finished product 7 to be obtained, formed of union of the fixed core with the amagnetic part.
  • a processing step is performed of the surfaces of the fixed core 2 and the amagnetic part 6, which must be welded to each other in the first welding step.
  • This processing step obtains, on both the fixed core 2 and on the amagnetic part 6, processed surfaces, respectively a surface 2a afforded on the fixed core and a surface 6a afforded on the amagnetic part; these surfaces do not develop on a radial plane of the respective elements, and are fitted together.
  • said processed surfaces are at least partially conical and are afforded, respectively, 2a outside the fixed core 2 and surface 6a inside the amagnetic part 6.
  • the processed surface 2a is afforded on a protrusion of the fixed core which defines the polar cone 3.
  • annular niche which may be variously arranged and which is not shown in the figure, and which is destined to house the material to be used for braze welding.
  • This first welding step is performed in an environment at a high temperature capable of melting the material used for braze welding; on melting, the braze welding material enters between the surfaces 2a and 6a facing each other in contact, thus causing close and firm connection once said material is once again solidified and guaranteeing the seal towards the outside of the pressurised fluid when the sleeve is completed.
  • the particular shape of the fixed core and the amagnetic part allows a semi-processed part 7 to be obtained which presents characterisation and optimisation of the polar cone; with this process, the working area of the fixed core is maximum and consequently does not reduce the efficiency of the actuator.
  • the process in question also envisages a second welding step to anchor the semi-finished part 7 to the sliding jacket; said second welding step is performed with a method of the known type, which allows localised welding, in an environment at room temperature, of the edges of the sliding jacket with the amagnetic part; to perform said second welding step, laser welding or TIG welding, for example, may be used.
  • the sleeve may be subjected to a turning step to remove any excess material and render the inner diameter of the amagnetic part equal to the inner diameter of the sliding jacket.
  • the first welding step which is performed with the elements to be connected remaining at a high temperature, does not cause significant deformations of said elements; in particular, it avoids deformation of the polar cone which, furthermore, is maintained at its nominal dimensions, with consequent optimal use of the magnetic sections of the actuator, without dispersion of the work areas. Furthermore, said step may be performed simultaneously on a high number of pieces and allows semi-processed parts 7 to be obtained which may be stored and used for realisation of various sleeves.
  • the sliding jacket is not involved in the thermal cycle of the first welding and consequently its mechanical characteristics are not altered by the thermal cycle.
  • Performance of the second welding step occurs with the elements to be connected at room temperature, clearly with the exception of the edges of the amagnetic part and the sliding jacket, which must be welded to each other. This allows semi-finished parts to be obtained, with clear advantages of repeatability of the process, but which may be welded to sliding jackets with different interfaces 5a, according to the customer's requirements.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
  • Electromagnets (AREA)
  • Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Fluid-Driven Valves (AREA)
EP13190698.4A 2012-11-28 2013-10-29 Schweißverfahren für Aktuator für Hydraulikventile Not-in-force EP2738779B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13190698T PL2738779T3 (pl) 2012-11-28 2013-10-29 Sposób spawania dla siłownika do zaworów hydraulicznych

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000296A ITMO20120296A1 (it) 2012-11-28 2012-11-28 Processo di saldatura per attuatore per valvole idrauliche

Publications (2)

Publication Number Publication Date
EP2738779A1 true EP2738779A1 (de) 2014-06-04
EP2738779B1 EP2738779B1 (de) 2015-09-09

Family

ID=47633238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13190698.4A Not-in-force EP2738779B1 (de) 2012-11-28 2013-10-29 Schweißverfahren für Aktuator für Hydraulikventile

Country Status (3)

Country Link
EP (1) EP2738779B1 (de)
IT (1) ITMO20120296A1 (de)
PL (1) PL2738779T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116373029A (zh) * 2023-06-07 2023-07-04 成都飞机工业（集团）有限责任公司 一种自动排屑超声插孔装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060028311A1 (en) * 2002-08-02 2006-02-09 Volker Burger Electromagnetic actuating device
DE102009008458A1 (de) * 2009-02-11 2010-08-12 Svm Schultz Verwaltungs-Gmbh & Co. Kg Polrohr mit Metallverbindung
DE102010000797A1 (de) * 2010-01-12 2011-07-14 Robert Bosch GmbH, 70469 Massivumformen einer magnetischen Trennung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060028311A1 (en) * 2002-08-02 2006-02-09 Volker Burger Electromagnetic actuating device
DE102009008458A1 (de) * 2009-02-11 2010-08-12 Svm Schultz Verwaltungs-Gmbh & Co. Kg Polrohr mit Metallverbindung
DE102010000797A1 (de) * 2010-01-12 2011-07-14 Robert Bosch GmbH, 70469 Massivumformen einer magnetischen Trennung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116373029A (zh) * 2023-06-07 2023-07-04 成都飞机工业（集团）有限责任公司 一种自动排屑超声插孔装置
CN116373029B (zh) * 2023-06-07 2023-10-03 成都飞机工业（集团）有限责任公司 一种自动排屑超声插孔装置

Also Published As

Publication number Publication date
PL2738779T3 (pl) 2015-12-31
ITMO20120296A1 (it) 2014-05-29
EP2738779B1 (de) 2015-09-09

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