EP1604755A1 - Vorrichtung zur Erhöhung der Einspitzdruck beim druckgiessen und so ausgerüstete Spritzgiessmachine - Google Patents

Vorrichtung zur Erhöhung der Einspitzdruck beim druckgiessen und so ausgerüstete Spritzgiessmachine Download PDF

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Publication number
EP1604755A1
EP1604755A1 EP05005109A EP05005109A EP1604755A1 EP 1604755 A1 EP1604755 A1 EP 1604755A1 EP 05005109 A EP05005109 A EP 05005109A EP 05005109 A EP05005109 A EP 05005109A EP 1604755 A1 EP1604755 A1 EP 1604755A1
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.)
Granted
Application number
EP05005109A
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English (en)
French (fr)
Other versions
EP1604755B1 (de
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
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 IDRA CASTING MACHINES SpA filed Critical IDRA CASTING MACHINES SpA
Publication of EP1604755A1 publication Critical patent/EP1604755A1/de
Application granted granted Critical
Publication of EP1604755B1 publication Critical patent/EP1604755B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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)
EP05005109A 2004-04-20 2005-03-09 Vorrichtung zur Erhöhung der Einspitzdruck beim druckgiessen und so ausgerüstete Spritzgiessmachine Not-in-force EP1604755B1 (de)

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 true EP1604755A1 (de) 2005-12-14
EP1604755B1 EP1604755B1 (de) 2007-02-07

Family

ID=34934152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05005109A Not-in-force EP1604755B1 (de) 2004-04-20 2005-03-09 Vorrichtung zur Erhöhung der Einspitzdruck beim druckgiessen und so ausgerüstete Spritzgiessmachine

Country Status (4)

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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7399179B2 (en) 2006-08-15 2008-07-15 Husky Injection Molding Systems Ltd. Injection unit mount
US7588434B2 (en) 2006-08-15 2009-09-15 Husky Injection Molding Systems Ltd. Fluid distributor and translatable drive apparatus for a molding
US20110247485A1 (en) * 2008-12-17 2011-10-13 Buhler Druckguss Ag Pressure Booster and Diecasting Arrangement
CN104923758A (zh) * 2014-03-21 2015-09-23 意特佩雷斯工业公司 用于液压压铸机的注入组件
CN110918927A (zh) * 2019-12-31 2020-03-27 中山市德工机械科技有限公司 压射增压系统及压铸机

Citations (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
JPS55117551A (en) * 1979-03-03 1980-09-09 Nissan Motor Co Ltd Plunger tip of die-casting device
FR2518914A1 (fr) * 1981-12-24 1983-07-01 Mueller Weingarten Maschf Machine a couler sous pression avec amortissement hydraulique en fin de course du piston d'injection
US4690629A (en) * 1985-06-19 1987-09-01 Yoshida Kogyo K. K. Injection molding machine for small-sized articles
DE4101551A1 (de) * 1991-01-21 1992-07-23 Janowski Gmbh Vorrichtung zur daempfung von druckspitzen

Patent Citations (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
JPS55117551A (en) * 1979-03-03 1980-09-09 Nissan Motor Co Ltd Plunger tip of die-casting device
FR2518914A1 (fr) * 1981-12-24 1983-07-01 Mueller Weingarten Maschf Machine a couler sous pression avec amortissement hydraulique en fin de course du piston d'injection
US4690629A (en) * 1985-06-19 1987-09-01 Yoshida Kogyo K. K. Injection molding machine for small-sized articles
DE4101551A1 (de) * 1991-01-21 1992-07-23 Janowski Gmbh Vorrichtung zur daempfung von druckspitzen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
HEMON Y: "PISTONS D'INJECTION DES MACHINES A COULER SOUS PRESSION A CHAMBRE FROIDE", FONDERIE, FONDEUR D'AUJOURD'HUI, EDITIONS TECHNIQUES DES INDUSTRIES DE LA FONDERIE, PARIS, FR, no. 105, 1 May 1991 (1991-05-01), pages 33 - 41, XP000205431, ISSN: 0249-3136 *
PATENT ABSTRACTS OF JAPAN vol. 004, no. 167 (M - 042) 19 November 1980 (1980-11-19) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7399179B2 (en) 2006-08-15 2008-07-15 Husky Injection Molding Systems Ltd. Injection unit mount
US7588434B2 (en) 2006-08-15 2009-09-15 Husky Injection Molding Systems Ltd. Fluid distributor and translatable drive apparatus for a molding
US20110247485A1 (en) * 2008-12-17 2011-10-13 Buhler Druckguss Ag Pressure Booster and Diecasting Arrangement
CN102256726A (zh) * 2008-12-17 2011-11-23 布勒压力铸造股份公司 压力转换器和用于压注的装置
US8887502B2 (en) * 2008-12-17 2014-11-18 Bühler Druckguss AG Pressure booster and diecasting arrangement
CN102256726B (zh) * 2008-12-17 2014-12-24 布勒压力铸造股份公司 压力转换器和用于压注的装置
CN104923758A (zh) * 2014-03-21 2015-09-23 意特佩雷斯工业公司 用于液压压铸机的注入组件
EP2942127A1 (de) * 2014-03-21 2015-11-11 Italpresse Industrie S.p.A. Druckgießmaschine mit Injektionsvorrichtung mit einem Absperrventil
CN104923758B (zh) * 2014-03-21 2018-11-06 意特佩雷斯工业单一合伙责任有限公司 用于液压压铸机的注入组件
EP3501691A1 (de) * 2014-03-21 2019-06-26 ITALPRESSE INDUSTRIE S.p.A. Druckgiessmaschine mit einer einspritzanordnung mit einem absperrventil
CN110918927A (zh) * 2019-12-31 2020-03-27 中山市德工机械科技有限公司 压射增压系统及压铸机

Also Published As

Publication number Publication date
ATE353257T1 (de) 2007-02-15
EP1604755B1 (de) 2007-02-07
ITMI20040769A1 (it) 2004-07-20
DE602005000538D1 (de) 2007-03-22

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