EP2946852A1 - Installation de coulée sous pression à vide et procédé de fonctionnement d'une installation de coulée sous pression à vide - Google Patents

Installation de coulée sous pression à vide et procédé de fonctionnement d'une installation de coulée sous pression à vide Download PDF

Info

Publication number: EP2946852A1
Authority: EP; European Patent Office
Prior art keywords: casting; cavity; piston; recess; depression
Prior art date: 2009-09-22
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

EP15156875.5A

Other languages

German (de)

English (en)

Other versions

EP2946852B1 (fr

Inventor

Roman Kaczmarczyk

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.)

KSM Castings Group GmbH

Original Assignee

KSM Castings Group 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.)

2009-09-22

Filing date

2010-09-22

Publication date

2015-11-25

2010-09-22 Application filed by KSM Castings Group GmbH filed Critical KSM Castings Group GmbH

2015-11-25 Publication of EP2946852A1 publication Critical patent/EP2946852A1/fr

2021-01-13 Application granted granted Critical

2021-01-13 Publication of EP2946852B1 publication Critical patent/EP2946852B1/fr

Status Active legal-status Critical Current

2030-09-22 Anticipated expiration legal-status Critical

Images

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
- 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 invention relates to a vacuum pressure casting apparatus according to the preamble of claim 1 and to a method for operating such a vacuum pressure casting plant.
Vacuum die casting is known for the production of castings from metals and metal alloys, in particular from alloys of the metals Al, Mg, Zn and Cu.
Corresponding plants for vacuum die casting are for example in the DE 4312647 A1 , of the DE 102004057324 A1 or the DE 102006101560 A1 described.
Vacuum die casting is used in particular where high demands are placed on tightness, elongation at break, strength and weldability of the castings. Vacuum die casting results in a higher quality of the castings as less air and gas is trapped in the material. This applies in particular to castings made of aluminum or an aluminum alloy, which are still heat-treated or welded in a later stage of the process.
a negative pressure or vacuum is generated in the mold cavity of the casting mold of the vacuum pressure casting system after the casting chamber has been filled with molten casting and the casting piston has passed the filling opening of the casting chamber.
An extremely significant leak in this case is the annular gap between the inner wall of the casting chamber and the outer shell of the casting piston. At this leak, from the back of the casting piston forth penetrating gases foam the casting melt in the standing under vacuum casting chamber and produce in the casting a gas porosity, which minimize or exclude a heat treatment and weldability.
the DE 43 12 647 A1 offers a solution for closing this leak, after which a technically very complicated evacuatable sliding sleeve is pushed over the G mantting- or G mankolbensystem to produce a vacuum behind the piston.
the disadvantage here is in particular the very high maintenance of such Vakuumdruckgussanlagen.
the invention has for its object to avoid the disadvantages of the prior art and to improve the process for the production of vacuum die castings, so that the quality of the castings increases.
the invention is also based on the object of improving the tightness, elongation at break, strength, heat-treatability and / or weldability of the castings produced by vacuum-pressure casting.
a further object of the invention is to accelerate the cycle time in vacuum die casting and thus to increase the production output,
the invention has for its object to improve the process for the production of vacuum die cast parts or a vacuum die casting system such that a higher vacuum in the mold cavity is adjustable.
this object is achieved in a vacuum pressure casting plant having a casting chamber with filling opening, a casting piston movable in the casting chamber and a piston rod which connects the Gisßkolben with a casting drive, wherein between the outer shell of the casting piston and the inner wall of the casting chamber, an annular gap is formed achieved, that the casting piston has at least one evacuable depression or cavity in fluid communication with the annular gap, and means are provided, via which the depression or cavity, preferably a groove, can be evacuated.
piston rod is inventively broad. It comprises not only a piston rod in the narrower sense, which is preferably advantageous for the majority of applications, but also other actuating means which move the casting piston linearly within the casting chamber. For certain applications, it may be advantageous if the piston rod is a connecting rod. For certain applications, it may in turn be useful if the casting piston driving rod is part of an eccentric.
the critical parameters for the flow rate of the gases within the leak between the inner wall of the casting chamber and the outer jacket of the casting piston are the thickness of the gap between the casting piston and the casting chamber and the pressure difference across the gap.
the negative pressure in the depression or cavity can even be greater than in the casting chamber filled with casting melt, so that the flow direction virtually inverted with respect to the prior art and gases and air flow from the casting chamber filled with casting melt into the depression or cavity , In the latter case, of course, then again a desired pressure difference across the annular gap is present.
the castings produced with the vacuum die casting system according to the invention are characterized by improved tightness, elongation at break, strength, heat treatability and weldability.
the invention is characterized in particular by the fact that the functionality of the vacuum pressure casting plant is easy to check and the vacuum die casting system for the sealing of the annular gap between casting piston and casting additional moving components needed which would be very susceptible to wear and maintenance.
all components of the vacuum pressure casting system according to the invention for maintenance work on the vacuum pressure casting system are very easily accessible and easily replaceable.
the control effort for evacuation of the depression or excavation is minimal and preferably takes place via a travel and / or time control.
the invention development can be implemented without alterations to the mold itself and can be applied to various sized vacuum die casting.
Another advantage of the invention is that a higher vacuum can be achieved in the mold cavity, thereby further improving the quality of the castings.
the recess or cavity is formed in the casting piston itself. This can be done advantageously by prototyping such a casting piston or preferably later by a machining the casting piston, in particular by milling or grinding.
the recess or cavity is formed directly or indirectly behind the casting piston by arranging at least one workpiece behind the casting piston, wherein the arrangement of the recess or cavity behind the casting piston is such that the depression or cavity before their evacuation in the non-filled with molten casting region of the casting chamber by moving in the casting piston can be brought into the casting chamber.
the recess or cavity may be formed in the workpiece itself.
the workpiece is spaced from the casting piston such that the recess or cavity is formed between the casting piston or at least one further workpiece arranged behind the casting piston and the first workpiece.
the recess or cavity in the workpiece itself is formed in combination with the aforementioned spaced arrangement.
the workpiece is designed like a ring and is preferably pushed onto the piston rod and fixable.
a conical design of the ring opening and / or the piston rod such a workpiece can be fixed in a simple manner by clamping on the piston rod.
fastening types in particular by screwing, press-fitting or welding, are arranged behind the casting piston.
the casting piston is designed in several parts.
the casting piston is formed in one piece or in one piece.
the casting piston is solid.
At least one collecting recess is provided, which is in flow connection with the annular gap and before at least one an evacuable depression or cavity is arranged.
the at least one collecting recess then serves as a sort of dirt trap and, in particular, also prevents the undesired substances from entering the vacuum system or clogging the vacuum suction lines emanating from the at least one evacuable depression or cavity.
the collecting recess and / or evacuatable recess is formed as a recess surrounding the outer jacket of the casting piston, the piston rod and / or the workpiece, preferably in the form of an annular groove.
a circumferential evacuable depression is advantageously arranged completely within the flow path of the gases or the air, so that little to preferably no gases or air pass through the gap between the casting chamber and the casting piston into the casting chamber.
a known in the prior art undesirable pressure difference which arises during evacuation of the mold cavity or the casting chamber and leads to the influx of gases or air through the annular gap in the casting chamber is significantly reduced to preferably eliminated.
the undesired pressure difference is even reversed by the negative pressure within the recess or cavity is selected to be greater than in the casting chamber filled with casting melt or as in the flow with the casting chamber connected mold cavity of the mold.
a desired pressure difference arises which causes a reversal of the flow direction.
a circumferential collecting well may be particularly useful to provide as comprehensive a limit as possible on undesirable matter and to substantially prevent the penetration of such matter into the well or cavity.
the collecting recess and / or the evacuable recess or cavity is provided only in the upper outer shell region of the casting piston, the piston rod and / or the workpiece. It has been shown that, depending on the vacuum die casting system used or the dimension and weight of the casting piston movable in the casting chamber, the annular gap between the outer shell of the casting piston and the inner wall of the casting chamber is not uniform, but is larger at the top than at the bottom.
these recesses are arranged distributed over the circumference of a workpiece designed as a ring.
These recesses may be bores through the inside of the ring.
the workpiece can be arranged immediately behind the casting piston, with only a vacuum on the inside of the ring needs to be applied to evacuate these wells.
a circumferential recess can be created advantageous if said ring has a smaller outer diameter than the casting piston, then for producing the circumferential recess behind the ring another workpiece, preferably also a ring, is arranged, which has the same outer diameter as the casting plunger.
the single form Wells or bore then a kind of nozzle field can be uniformly evacuated through the single circumferential recess.
the evacuable depression or cavity is dimensioned and evacuable such that less or preferably no gases or air flow through the annular gap into the casting chamber during evacuation of the casting cavity or the casting chamber, and particularly preferably the flow direction in the annular gap is reversed and the gases or air flow in the direction of evacuable depression or cavity.
a prevailing in the prior art in evacuating the mold cavity or the casting chamber pressure difference which leads to the influx of gases or air through the gap in the casting chamber, i. virtually a pressure difference between the filled with molten casting chamber before the casting piston and the recess or cavity is minimized by the evacuation of the recess or cavity according to the invention, preferably eliminated, particularly preferably reversed.
the evacuable depression or cavity is subjected to a vacuum in such a way that less or preferably no gases or air flow through the said gap into the casting chamber when evacuating the casting cavity or the casting chamber, and the flow direction in the flow chamber is particularly preferred Gap inverted and the gases or air flow towards evacuable depression or cavity.
the means for evacuating the depression or cavity have at least one recess, in particular a longitudinal recess, within the piston rod, which fluidly communicates with its one end the evacuable depression or cavity and are connected at the other end fluidly connected to a vacuum system.
the at least one evacuable well if not being evacuated, is usable for introducing a lubricant or other functional substance into the casting chamber, the lubricant or other functional material then passing over the at least one connected to the depression vacuum suction line or another provided for this purpose line in the recess or cavity and thus in the casting chamber can be introduced.
the means for evacuating the depression or cavity comprise at least one line or bore contained in the piston rod, in particular a coolant line or bore.
the means comprise at least one, preferably two or more suction lines, in particular suction tubes, which are each fluidically connected at one end to the evacuable depression or cavity and at the other end to a vacuum system.
the suction line in particular the suction tube, extends along the piston rod, preferably in a groove introduced on the outside of the piston rod, and merges with its one end through the piston or workpiece area facing the piston rod into the recess or cavity and is fluidically connected to this.
the cross section of the recess or the suction recess, in particular of the suction tube is chosen to be so large that the vacuum which can be set in the recess or cavity, despite existing leakage between recess or cavity and the area behind the depression or cavity .
Excavation arranged and over the emanating from the recess or cavity and to the piston rod leading annular gap with the recess or cavity is maintained over a predetermined time, in particular over the time in which the casting chamber and the mold cavity are evacuated and a negative pressure in the mold cavity is maintained.
At least one suction tube is provided within the piston rod that merges with its one end in the recess or cavity and is fluidically connected thereto.
the vacuum die casting plant is a cold chamber vacuum die casting plant.
a control is provided for the vacuum pressure casting system, which is connected to a controller for the vacuum system and via this connection a start signal is transmitted to the vacuum system for evacuation of the depression or cavity.
a development of the invention provides that the depression or cavity is arranged as close as possible to the region of the casting piston facing the casting chamber filled with melt. This ensures that the recess or cavity is evacuated early, so that the switching time or usage time of the vacuum increases and the quality of the cast products is further improved by a correspondingly improved vacuum.
the inventive method leads to a significant improvement in the quality of Gusstelle.
the vacuum die casting plant according to the invention has a casting mold, not shown here, which is constructed from, for example, two mold halves.
the interior of the mold, so the cavity or the mold cavity is connected to the casting chamber 10, which is filled with melt for the casting process.
This is filled through the filling opening 12 and pressed by means of the casting piston 14 in the mold cavity.
the gas present in the mold cavity is sucked off via a venting valve, not shown here, for example a so-called washboard.
the solidifying metal rises up to this vent valve.
the casting piston 14 is moved by a casting drive not shown here via a casting piston rod 16, that is displaced in the casting chamber 10.
the control is carried out by the casting plant control.
the vacuum pressure casting system also has a vacuum system, not shown here, which are connected via corresponding vacuum lines with the casting chamber 10 and / or the mold cavity and the mold cavity together with the space located before the casting piston 32 of the casting chamber 10, for example, at a predetermined time during the casting process, evacuated after a predetermined distance of the casting piston 14 or according to other criteria.
annular gap 18 is present, through the air or gases from the rear side of the casting piston 14 into the casting chamber 10 and in the filled therein Melt be pulled, the penetrating gases foam the melt in the standing under vacuum casting chamber and produce in the produced casting a gas porosity, which minimize or exclude a heat treatment and welding ability, is now provided according to the invention that the casting piston 14 at least one with the Annular gap 18 fluidly connected, evacuatable recess 20 and means are provided, via which the depression or cavity is evacuated.
the evacuable recess 20 is here - as in the Fig. 1 to 4 shown - formed as a casting piston 14 circumferential annular groove 24 and is thus advantageously completely in the flow path of the prior art actually through the annular gap 18 into the space 32 of the casting chamber 10 flowing gases or air.
the means for evacuating the recess 20 comprise two suction tubes 22, which are each fluidically connected at one end 24 with the evacuatable annular groove 20 and at the other end with the aforementioned fluid or another vacuum system.
the suction tubes 22 are in this case arranged opposite one another along the piston rod 16 in a groove 26 respectively introduced on the outside of the piston rod 16, wherein the ends 24 pass into the annular groove 20 through the piston region 28 facing the piston rod 16 and are fluidically connected thereto.
the piston rod 16 itself is hollow and has a piston cooling 30.
the casting piston 14 may be integrally formed, wherein the piston portion 28 is then part of the integral casting piston 14 and the recess 20 is introduced in the form of an annular groove bispielmati by machining milling in the casting piston 14.
the piston portion 28 is a separate workpiece, for example in the form of a connection ring, which is spaced from the casting piston 14, in particular clamped on the piston rod 16. This will, as in Fig. 1 can be seen, a recess 20 formed in the form of an annular groove.
a first workpiece in the form of a ring 34 is arranged behind the casting piston 14, wherein the ring 34 has a smaller outer diameter than the casting piston 14.
the ring 34 has distributed over the circumference numerous depressions in the form of holes 36 which are fluidically connected on the inside of the ring. It is advantageous here that an evacuation on the inside of the ring leads to a uniform evacuation of the circumferential recess 20.
This numerous depressions in the form of holes 26 in this case form a kind of nozzle field.
To the ring 24 connects another workpiece in the form of a connection ring. This connection ring then forms the abovementioned piston region 28 and corresponds in external diameter to that of the casting piston 14.
Fig. 4 finally shows the device according to Fig. 1 , However, has an additional collecting recess 38 in the form of an annular groove, which serves to trap unwanted substances, such as tinsel or lubricant, and is connected upstream of the evacuated depression.
the control for the vacuum die-casting system is advantageously connected to a control of the vacuum system for evacuating the annular groove 20, wherein a simple, on the vacuum system transmitted away or timed start signal to evacuate the annular groove 20 is sufficient.
the casting piston 14 is first moved to the extent that the annular groove 20 Feed opening 12 has happened. Subsequently, preferably substantially simultaneously with the evacuation of the mold cavity and the casting chamber 10, the annular groove 20 is evacuated such that no gases or air flow through said gap 18 into the casting chamber 10.

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

EP15156875.5A 2009-09-22 2010-09-22 Installation de coulée sous pression à vide et procédé de fonctionnement d'une installation de coulée sous pression à vide Active EP2946852B1 (fr)

Applications Claiming Priority (4)

Application Number	Priority Date	Filing Date	Title
DE102009042253		2009-09-22
DE102009054174		2009-11-23
PCT/DE2010/001104 WO2011035765A1 (fr)	2009-09-22	2010-09-22	Installation de coulée sous vide et procédé permettant de faire fonctionner une installation de coulée sous vide
EP10773549.0A EP2480357B1 (fr)	2009-09-22	2010-09-22	Installation de coulée sous pression à vide et procédé d´opération d´une installation de coulée sous pression à vide

Related Parent Applications (3)

Application Number	Title	Priority Date	Filing Date
EP10773549.0A Division EP2480357B1 (fr)	2009-09-22	2010-09-22	Installation de coulée sous pression à vide et procédé d´opération d´une installation de coulée sous pression à vide
EP10773549.0A Division-Into EP2480357B1 (fr)	2009-09-22	2010-09-22	Installation de coulée sous pression à vide et procédé d´opération d´une installation de coulée sous pression à vide
DEPCT/DE2010/773549 Previously-Filed-Application		2010-09-22

Publications (2)

Publication Number	Publication Date
EP2946852A1 true EP2946852A1 (fr)	2015-11-25
EP2946852B1 EP2946852B1 (fr)	2021-01-13

Family

ID=43416909

Family Applications (2)

Application Number	Title	Priority Date	Filing Date
EP10773549.0A Active EP2480357B1 (fr)	2009-09-22	2010-09-22	Installation de coulée sous pression à vide et procédé d´opération d´une installation de coulée sous pression à vide
EP15156875.5A Active EP2946852B1 (fr)	2009-09-22	2010-09-22	Installation de coulée sous pression à vide et procédé de fonctionnement d'une installation de coulée sous pression à vide

Family Applications Before (1)

Application Number	Title	Priority Date	Filing Date
EP10773549.0A Active EP2480357B1 (fr)	2009-09-22	2010-09-22	Installation de coulée sous pression à vide et procédé d´opération d´une installation de coulée sous pression à vide

Country Status (6)

Country	Link
US (2)	US8813815B2 (fr)
EP (2)	EP2480357B1 (fr)
JP (1)	JP5709873B2 (fr)
CN (1)	CN102548686B (fr)
DE (2)	DE112010003048A5 (fr)
WO (1)	WO2011035765A1 (fr)

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* Cited by examiner, † Cited by third party
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CN103097146A (zh)	2010-09-14	2013-05-08	Ksm铸造集团有限公司	用于机动车的轮毂
SG194253A1 (en) *	2012-04-23	2013-11-29	Pratt & Whitney Services Pte Ltd	Shot tube plunger tip portion
JP5987674B2 (ja)	2012-12-19	2016-09-07	マツダ株式会社	鋳造装置および鋳造方法
SI24339A (sl) *	2013-04-24	2014-10-30	Hts Ic D.O.O.	Bat z optimalno hladilno efektivnostjo za hladno-komorne tlačno-livne sisteme
JP6144145B2 (ja) *	2013-07-31	2017-06-07	愛知機械工業株式会社	プランジャ装置
CN110121566A (zh)	2016-12-22	2019-08-13	Ksm铸造集团有限公司	铝铸造合金
JP6159044B2 (ja) *	2017-02-27	2017-07-05	愛知機械工業株式会社	鋳造成形品の製造方法
DE102018128040A1 (de)	2017-11-17	2019-05-23	Ksm Castings Group Gmbh	Al-Gusslegierung
DE102019107325A1 (de) *	2019-03-21	2020-09-24	Engel Austria Gmbh	Aufschmelzeinheit für eine Formgebungsmaschine und Formgebungsmaschine mit einer solchen
IT202000000553A1 (it) *	2020-01-14	2021-07-14	Copromec Die Casting S R L A Socio Unico	Testa e pistone lubrificato
CN114433815A (zh) *	2022-01-21	2022-05-06	刘金全	一种电机转子鼠笼低压铸铜设备及其铸铜方法
DE102023124831A1 (de)	2023-09-14	2025-03-20	InterGuss Gießereiprodukte GmbH	Gießvorrichtung für eine Vakuumdruckgussanlage, Vakuumdruckgussanlage und Verfahren zum Betreiben der Vakuumdruckgussanlage

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2010
- 2010-09-22 US US13/497,106 patent/US8813815B2/en active Active
- 2010-09-22 JP JP2012530126A patent/JP5709873B2/ja not_active Expired - Fee Related
- 2010-09-22 CN CN201080042307.8A patent/CN102548686B/zh active Active
- 2010-09-22 EP EP10773549.0A patent/EP2480357B1/fr active Active
- 2010-09-22 DE DE112010003048T patent/DE112010003048A5/de not_active Withdrawn
- 2010-09-22 DE DE102010046041A patent/DE102010046041A1/de not_active Withdrawn
- 2010-09-22 EP EP15156875.5A patent/EP2946852B1/fr active Active
- 2010-09-22 WO PCT/DE2010/001104 patent/WO2011035765A1/fr active Application Filing
2014
- 2014-06-12 US US14/302,916 patent/US8967232B2/en not_active Expired - Fee Related

Patent Citations (5)

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Publication number	Priority date	Publication date	Assignee	Title
JPS61232050A (ja) *	1985-04-08	1986-10-16	Ube Ind Ltd	ダイカストマシンの射出装置
JPH01313174A (ja) *	1988-06-10	1989-12-18	Keihin Seiki Mfg Co Ltd	真空ダイカスト装置
JPH01313171A (ja) *	1988-06-10	1989-12-18	Keihin Seiki Mfg Co Ltd	真空ダイカスト装置
JP2002346717A (ja) *	2001-05-17	2002-12-04	Toshiba Mach Co Ltd	真空ダイカスト装置におけるプランジャチップの周辺構造
JP2004268051A (ja) *	2003-03-05	2004-09-30	Hiroshima Aluminum Industry Co Ltd	真空ダイカスト装置

Also Published As

Publication number	Publication date
CN102548686A (zh)	2012-07-04
US20140290893A1 (en)	2014-10-02
US8813815B2 (en)	2014-08-26
WO2011035765A9 (fr)	2011-08-11
CN102548686B (zh)	2016-08-03
DE102010046041A1 (de)	2011-04-21
US8967232B2 (en)	2015-03-03
EP2946852B1 (fr)	2021-01-13
JP2013505138A (ja)	2013-02-14
WO2011035765A1 (fr)	2011-03-31
EP2480357A1 (fr)	2012-08-01
US20120180973A1 (en)	2012-07-19
DE112010003048A5 (de)	2012-06-14
EP2480357B1 (fr)	2020-04-15
JP5709873B2 (ja)	2015-04-30

Publication	Publication Date	Title
EP2946852B1 (fr)	2021-01-13	Installation de coulée sous pression à vide et procédé de fonctionnement d'une installation de coulée sous pression à vide
EP2239070B1 (fr)	2015-06-03	Dispositif de coulée
EP1819465B1 (fr)	2013-02-27	Procede de coulee sous vide
CH654768A5 (de)	1986-03-14	Entgasungsvorrichtung an einer druck- oder spritzgiessform.
DE3605529C3 (de)	1995-11-09	Druckgießverfahren und Druckgießmaschine
DE102007060418B4 (de)	2010-11-11	Verfahren und Vorrichtung zum Vakuum-Druckgießen zur Herstellung von porenarmen und warmbehandelbaren Gussteilen
DE4313800B4 (de)	2005-05-04	Vakuumdruckgussverfahren
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