EP1181998A2 - Entzerrer für Zwangsverschluss von Einlassventilen in Druckgiessformen - Google Patents

Entzerrer für Zwangsverschluss von Einlassventilen in Druckgiessformen Download PDF

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Publication number
EP1181998A2
EP1181998A2 EP01830543A EP01830543A EP1181998A2 EP 1181998 A2 EP1181998 A2 EP 1181998A2 EP 01830543 A EP01830543 A EP 01830543A EP 01830543 A EP01830543 A EP 01830543A EP 1181998 A2 EP1181998 A2 EP 1181998A2
Authority
EP
European Patent Office
Prior art keywords
equaliser
belleville washers
die
piston
accordance
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
EP01830543A
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English (en)
French (fr)
Other versions
EP1181998B1 (de
EP1181998A3 (de
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designation of the inventor has not yet been filed The
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Individual
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Application filed by Individual filed Critical Individual
Publication of EP1181998A2 publication Critical patent/EP1181998A2/de
Publication of EP1181998A3 publication Critical patent/EP1181998A3/de
Application granted granted Critical
Publication of EP1181998B1 publication Critical patent/EP1181998B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • B22D17/145—Venting means therefor

Definitions

  • This invention concerns an equaliser device to aid closure of a suction valve for the discharge of air and gas from die-casting moulds.
  • moulds which have a mobile part and a fixed part which can be closed together and may be equipped with a suction valve for evacuating air and gas from the mould thus preventing their inclusion in the die-cast pieces.
  • a suction valve for such use normally consists of a body to be fixed to the mobile part of the mould and a cover to be fixed to the fixed part of the mould, or vice-versa, in such a way that opening and closing of the mould coincide with opening and closing of the valve.
  • the valve may be kept under tension by a spring loaded equaliser device that acts perpendicularly on the valve when the mould is closed, keeping the two elements of the valve closely locked one to the other.
  • Equalisers incorporating Belleville washers acting on a piston are well known, where the washers are all overlapped in an assembly with an inappropriate layout which limits performance of the device and which may lead to the washers breaking after only a short time.
  • the power of the device does not correspond to the summation of the load of the washers but is reduced, and even the intactness of the washers comes to be jeopardised.
  • One aim of this invention is to remedy the inconveniencies and disadvantages of the well known technique employed in equalisers for the closure of suction valves in die-casting moulds by means of a new, original positioning of the washers in relation to a thrust piston.
  • Another aim of the invention is to supply, for the above-mentioned purpose, a spring loaded equaliser that is more efficient and reliable and above all sectional in accordance with necessity and depending on the load required.
  • a further aim is to supply an equaliser that can be set up as a unit in itself or integrated directly into a cover die with the suction valve.
  • equaliser is shown globally with 11 and associated with a suction valve 12 applied to a die-casting mould 13.
  • Suction valve 12 includes a first element or half-valve 12' and a second element or half-valve 12" which can be closed one on the other.
  • the first half-valve 12' is attached to fixed part 13 of the mould by means of support block 14'; the second half-valve 12" is attached to mobile part 13" of the mould by means of support block 14". This in such a way that opening and closing of the mould correspond to opening and closing of the valve.
  • the equaliser 11 consists of an external body or casing 15, a central piston 16 guided axially on a head 17, and a multiplicity of Belleville washers 18 placed concentrically between piston 16 and external body 15.
  • the equaliser is located between support block 14" and mobile half-valve 12" with guide head 17 connected to the said half-valve and piston 16 projecting axially from body 15, and abutting with support block 14" or vice versa.
  • the Belleville washers are set in groups, preferably in threes 18', on several parallel levels along piston 16. Each trio of Belleville washers 18 - Fig. 1 - rests axially with one part on a collar 19 applied to piston 16 and the other against support washer 20 inside body 15.
  • the body may consist of two or more sectional segments in order to be able to set its length on the basis of the selected number of Belleville washers, and around each group or trio of Belleville washers there may be spacer 21, either separate or solid with an adjacent washer 20.
  • At least one spacer 21 is shorter than the others and floating in order to permit axial movement of the piston in relation to the body, contrasted by the Belleville washers. Moreover, with the appropriate choice of washer and/or spacer height it is possible to vary the preload of the Belleville washers.
  • the equaliser may also be made without the external casing with guided spacers and piston, which is to say, incorporated into the mould in various ways.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compressor (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Control Of Fluid Pressure (AREA)
  • Valve Housings (AREA)
  • Producing Shaped Articles From Materials (AREA)
EP01830543A 2000-08-24 2001-08-16 Entzerrer für Zwangsverschluss von Einlassventilen in Druckgiessformen Expired - Lifetime EP1181998B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000BS000060U IT250560Y1 (it) 2000-08-24 2000-08-24 Compensatore per la chiusura forzata di valvole di aspirazione instampi per la pressofusione
ITBS000060U 2000-08-24

Publications (3)

Publication Number Publication Date
EP1181998A2 true EP1181998A2 (de) 2002-02-27
EP1181998A3 EP1181998A3 (de) 2002-03-06
EP1181998B1 EP1181998B1 (de) 2006-12-06

Family

ID=11440530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01830543A Expired - Lifetime EP1181998B1 (de) 2000-08-24 2001-08-16 Entzerrer für Zwangsverschluss von Einlassventilen in Druckgiessformen

Country Status (4)

Country Link
EP (1) EP1181998B1 (de)
AT (1) ATE347458T1 (de)
DE (1) DE60124992T2 (de)
IT (1) IT250560Y1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1416039A (fr) * 1963-11-14 1965-10-29 Procédé et machine de moulage sous pression
CH454369A (de) * 1966-03-18 1968-04-15 Buehler Ag Geb Absaugvorrichtung zum Entlüften der Formen von Druckgiessmaschinen
US3885618A (en) * 1972-10-05 1975-05-27 Fritz Hodler Ventilation valve for closing a ventilation duct in a casting mold
US4027726A (en) * 1974-06-10 1977-06-07 Fritz Hodler Pressure die-casting block with a venting valve
JPS61165262A (ja) * 1985-01-18 1986-07-25 Toshiba Mach Co Ltd ダイカスト金型のバルブ装置
US5488985A (en) * 1993-02-02 1996-02-06 Fondarex, F. Hodler & Cie. S.A. Valve assembly for venting diecasting moulds

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1416039A (fr) * 1963-11-14 1965-10-29 Procédé et machine de moulage sous pression
CH454369A (de) * 1966-03-18 1968-04-15 Buehler Ag Geb Absaugvorrichtung zum Entlüften der Formen von Druckgiessmaschinen
US3885618A (en) * 1972-10-05 1975-05-27 Fritz Hodler Ventilation valve for closing a ventilation duct in a casting mold
US4027726A (en) * 1974-06-10 1977-06-07 Fritz Hodler Pressure die-casting block with a venting valve
JPS61165262A (ja) * 1985-01-18 1986-07-25 Toshiba Mach Co Ltd ダイカスト金型のバルブ装置
US5488985A (en) * 1993-02-02 1996-02-06 Fondarex, F. Hodler & Cie. S.A. Valve assembly for venting diecasting moulds

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 372 (M-544), 11 December 1986 (1986-12-11) & JP 61 165262 A (TOSHIBA MACH CO LTD), 25 July 1986 (1986-07-25) *

Also Published As

Publication number Publication date
ITBS20000060V0 (it) 2000-08-24
DE60124992D1 (de) 2007-01-18
IT250560Y1 (it) 2003-09-24
ITBS20000060U1 (it) 2002-02-24
EP1181998B1 (de) 2006-12-06
DE60124992T2 (de) 2007-09-20
ATE347458T1 (de) 2006-12-15
EP1181998A3 (de) 2002-03-06

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