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EP1604755B1 - Dispositif d'amplification de pression d'injection de coulée sous pression et machine à couler sous pression équipée de ce dispositif - Google Patents

Dispositif d'amplification de pression d'injection de coulée sous pression et machine à couler sous pression équipée de ce dispositif Download PDF

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Publication number
EP1604755B1
EP1604755B1 EP05005109A EP05005109A EP1604755B1 EP 1604755 B1 EP1604755 B1 EP 1604755B1 EP 05005109 A EP05005109 A EP 05005109A EP 05005109 A EP05005109 A EP 05005109A EP 1604755 B1 EP1604755 B1 EP 1604755B1
Authority
EP
European Patent Office
Prior art keywords
piston
injection
injection assembly
booster
assembly according
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.)
Expired - Lifetime
Application number
EP05005109A
Other languages
German (de)
English (en)
Other versions
EP1604755A1 (fr
Inventor
Alfredo Martini
Ruggero Ferri
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.)
IDRA CASTING MACHINES SpA
Original Assignee
IDRA CASTING MACHINES SpA
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Filing date
Publication date
Application filed by IDRA CASTING MACHINES SpA filed Critical IDRA CASTING MACHINES SpA
Publication of EP1604755A1 publication Critical patent/EP1604755A1/fr
Application granted granted Critical
Publication of EP1604755B1 publication Critical patent/EP1604755B1/fr
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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
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons

Definitions

  • the present invention relates to an injection assembly with pressure booster for pressure die-casting machines.
  • the invention also relates to a pressure die-casting machine provided with the injection assembly.
  • the field of the invention relates to machines for pressure die-casting of aluminum alloys or magnesium alloys.
  • these machines are presses that have a horizontal axis for the injection of the alloy into the die and are constituted by two main assemblies:
  • a booster piston is generally used which, being pushed on the piston side by the line pressure, acts on the stem side on the liquid that is contained in the injection chamber, increasing the injection pressure up to a maximum of the injection pressure that is generally equal to approximately three times the line pressure (hence the name "booster piston” or simply "booster").
  • the pressure of the third step is in any case adjustable between the line pressure and three times its value, by acting on the ring on the stem side of the booster with a variable counterpressure that can attenuate the action of the booster in a chosen manner.
  • the aim of the present invention is to provide a new injection assembly with pressure booster of the coaxial type which, with respect to the background art that has been considered, offers lower inertia and therefore faster action.
  • Another object of the invention is to provide a pressure die-casting machine that is provided with the pressure booster.
  • the injection assembly according to the invention allows to provide a booster piston that has a smaller mass and accordingly allows to achieve faster execution of the third injection or boosting step.
  • this speed is important, since the compaction that one wishes to obtain on the alloy that is solidifying must be as quick as possible in order to achieve the effect of reducing the porosities in the die-cast part before complete solidification. Usually, this compaction must occur in a time comprised between 15 and 30 ms, a result that is fully achieved and can even be exceeded according to the invention.
  • Figure 1 illustrates the essential components of interest for the invention of a pressure die-casting machine that includes an injection assembly 1 and a closure assembly 2.
  • the closure assembly 2 substantially provides two die parts 3 and 4, between which there is a casting cavity 5 into which a molten metallic alloy 6 is propelled under pressure. This propulsion is determined by a main injection piston 7, by way of a piston 8 that is inserted in a container 9 of the alloy 6.
  • the injection assembly 1 includes a main injection block 10, which is rigidly coupled to an injection cylinder 11, inside which the main injection piston 7 is accommodated so that it can slide axially.
  • the injection piston is moved by the inflow of pressurized liquid that enters through an annular input circuit 12 and acts on the main piston 7 after opening a flow control member 30 of a check or one-way valve 13.
  • the valve 13 is in turn rigidly coupled to the main injection block 10 and is held in the closed position by means of springs 14 and kept in its open position by a single-action piston 15, which in turn is pushed by an actuation liquid that enters a cavity 16 of the cover of the valve 13 ( Figure 3).
  • the liquid that enters the annular circuit 12 flows inside a channel 31 formed by an extension 32 of the valve body 13. Further, a booster piston 17 forms a portion of a duct 33 for feeding the actuation liquid of the main injection piston 7.
  • the booster piston 17, provided with a stem 20, is arranged coaxially with respect to the main injection piston 7.
  • the booster piston has a fully separate and independent structure with respect to the valve 13 and is arranged downstream thereof along the direction of motion of the main injection piston 7.
  • the booster piston 17 is arranged coaxially to the main injection piston 7 and to the extension 32 of the valve body 13 and is fitted so that it is superimposed with respect to the extension 32.
  • the movements of the booster piston 17 are guided by means of an external surface 18 thereof having a larger diameter, which is engaged in a cylindrical cavity 19 of the main injection block 10, and by way of an outer cylindrical surface 21 of the stem 20, which in turn is engaged so that it can slide on a surface 22 of a guiding bush 23. According to the invention, therefore, the movements of the booster piston 17 are independent of the check valve 13, which is physically separate from the body of the piston 17 and remains motionless during the motion of the piston.
  • the liquid that enters the annular cavity 12 after opening the check valve 13 flows axially in the advancement direction of the main injection piston 7.
  • the flowrate of the liquid is increased (by using an appropriately provided accumulation device 24), allowing to achieve a higher advancement speed of the injection piston 7.
  • the advancement of the booster piston 17 is actuated by the inflow of an actuation liquid into a hole 25 and a ring 26, which are provided upstream of the booster piston 17 on the main injection block 10.
  • the action of the liquid is applied to the annular surface 28 of the piston 17.
  • the illustrated embodiment allows to use a counterpressure on the booster piston 17, so as to control and adjust the final boosting force thereof, provided by way of a flow of liquid that enters a ring 27 that lies inside the main block 10 and acts on an annular surface 29 of the piston 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (12)

  1. Assemblage d'injection avec intensifieur de pression pour des machines de moulage sous pression, comprenant un piston d'injection principal (7) qui est actionné par un liquide sous pression, lequel est amené à s'écouler par un clapet de non retour (13), et un piston intensifieur (17), qui est agencé de telle sorte qu'il puisse glisser axialement par rapport audit piston principal (7), caractérisé en ce que ledit piston intensifieur (17) est séparé dudit clapet de non retour (13), de manière à se mouvoir indépendamment de celui-ci et donc à réduire l'inertie dudit piston intensifieur.
  2. Assemblage d'injection selon la revendication 1, caractérisé en ce que ledit piston intensifieur (17) est agencé en aval dudit clapet (13) dans le sens de l'avancement du piston d'injection principal (7).
  3. Assemblage d'injection selon la revendication 1 ou 2, caractérisé en ce que ledit clapet (13) est fixé de telle manière à être couplé de manière rigide avec ledit bloc d'injection principal (10).
  4. Assemblage d'injection selon la revendication 3, caractérisé en ce que ledit clapet de non retour (13) est muni de ressorts (14) destinés à fermer l'organe de commande d'écoulement (30) de celui-ci et comporte un piston (15) destiné à ouvrir ledit l'organe de commande d'écoulement et un circuit annulaire (12) destiné à amener le liquide d'actionnement dudit piston d'injection principal (7).
  5. Assemblage d'injection selon la revendication 3, caractérisé en ce que ledit clapet (13) comporte un prolongement (32) à l'intérieur duquel est ménagé un canal (31) pour le passage du liquide destiné à actionner ledit piston d'injection principal (7).
  6. Assemblage d'injection selon la revendication 3, caractérisé en ce que ledit piston intensifieur (17) forme en outre une partie d'un conduit (33) destiné à amener le liquide moteur dudit piston d'injection principal (7).
  7. Assemblage d'injection selon la revendication 3, caractérisé en ce que ledit bloc d'injection principal (10) est pourvu d'un orifice (25) destiné à amener le liquide moteur dudit piston intensifieur (17).
  8. Assemblage d'injection selon la revendication 7, caractérisé en ce qu'il est en outre pourvu d'un anneau au niveau d'une surface annulaire (28) dudit piston (17).
  9. Assemblage d'injection selon les revendication 3, 7 ou 8, caractérisé en ce que ledit piston intensifieur (17) est pourvu d'une surface extérieure qui a un diamètre plus grand (18) et est engagée dans une cavité cylindrique (19) dudit bloc principal (10), et d'une tige (20) qui est pourvue d'une surface cylindrique extérieure (21), lesdites surfaces cylindriques extérieures (18, 21) guidant le mouvement axial dudit piston intensifieur (17).
  10. Assemblage d'injection selon la revendication 9, caractérisé en ce qu'il comprend une douille de guidage (23) pourvue d'une surface (22) pour le glissement de ladite surface (21) dudit piston intensifieur (17).
  11. Assemblage d'injection selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'il est pourvu d'un anneau (27) qui est agencé à l'intérieur dudit bloc principal (10) pour l'admission d'un liquide de contre-pression, lequel est approprié pour agir sur une surface annulaire (29) dudit piston (17).
  12. Machine de moulage sous pression du type comprenant un assemblage de fermeture (2) qui est pourvu de pièces de moule (3, 4) qui forment entre elles une cavité de moulage (5) destinée à contenir un alliage métallique en fusion (6) qui est amené à progresser par pression à l'intérieur du moule par l'intermédiaire d'un piston poussoir (8), lequel peut glisser à l'intérieur d'un récipient (9) dudit alliage métallique (6), caractérisé en ce qu'elle est pourvue d'au moins un assemblage d'injection (1) ayant un intensifieur de pression, selon une ou plusieurs des revendications précédentes.
EP05005109A 2004-04-20 2005-03-09 Dispositif d'amplification de pression d'injection de coulée sous pression et machine à couler sous pression équipée de ce dispositif Expired - Lifetime EP1604755B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20040769 2004-04-20
IT000769A ITMI20040769A1 (it) 2004-04-20 2004-04-20 Gruppo di iniezione con moltiplicatore di pressione per macchine di pressofusione e macchina di pressofusione provvista del detto gruppo di iniezione

Publications (2)

Publication Number Publication Date
EP1604755A1 EP1604755A1 (fr) 2005-12-14
EP1604755B1 true EP1604755B1 (fr) 2007-02-07

Family

ID=34934152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05005109A Expired - Lifetime EP1604755B1 (fr) 2004-04-20 2005-03-09 Dispositif d'amplification de pression d'injection de coulée sous pression et machine à couler sous pression équipée de ce dispositif

Country Status (4)

Country Link
EP (1) EP1604755B1 (fr)
AT (1) ATE353257T1 (fr)
DE (1) DE602005000538D1 (fr)
IT (1) ITMI20040769A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7588434B2 (en) 2006-08-15 2009-09-15 Husky Injection Molding Systems Ltd. Fluid distributor and translatable drive apparatus for a molding
US7399179B2 (en) 2006-08-15 2008-07-15 Husky Injection Molding Systems Ltd. Injection unit mount
DE102008055542A1 (de) * 2008-12-17 2010-07-01 Bühler Druckguss AG Druckübersetzer mit integriertem Rückschlagventil
PL3501691T3 (pl) * 2014-03-21 2021-09-27 Italpresse Industrie S.P.A. Zespół wtryskowy wyposażony w zawór odcinający dla maszyny do odlewania ciśnieniowego
CN110918927B (zh) * 2019-12-31 2024-07-23 广东实密智能装备有限公司 压射增压系统及压铸机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3605871A (en) * 1969-05-01 1971-09-20 Richard K Whitehead Sr Die casting machine including sequentially acting compound pistion assembly machine
JPS58946B2 (ja) * 1979-03-03 1983-01-08 日産自動車株式会社 ダイカスト装置のプランジヤチツプ
DE3151274C1 (de) * 1981-12-24 1983-07-28 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Druckgiessmaschinen-Einpreßsystem mit einem Presszylinder verschiebbaren Pressekolben mit einer hydraulischen Dämpfung am Ende des Presszylinders
JPS61290026A (ja) * 1985-06-19 1986-12-20 Yoshida Kogyo Kk <Ykk> 小物成形用射出成形機
DE4101551A1 (de) * 1991-01-21 1992-07-23 Janowski Gmbh Vorrichtung zur daempfung von druckspitzen

Also Published As

Publication number Publication date
EP1604755A1 (fr) 2005-12-14
DE602005000538D1 (de) 2007-03-22
ATE353257T1 (de) 2007-02-15
ITMI20040769A1 (it) 2004-07-20

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