EP0255475A2 - Cylindre de remplissage pour machines de coulée sous pression - Google Patents

Cylindre de remplissage pour machines de coulée sous pression Download PDF

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Publication number
EP0255475A2
EP0255475A2 EP87810346A EP87810346A EP0255475A2 EP 0255475 A2 EP0255475 A2 EP 0255475A2 EP 87810346 A EP87810346 A EP 87810346A EP 87810346 A EP87810346 A EP 87810346A EP 0255475 A2 EP0255475 A2 EP 0255475A2
Authority
EP
European Patent Office
Prior art keywords
rings
ceramic
filling sleeve
sleeve according
hollow cylinder
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
EP87810346A
Other languages
German (de)
English (en)
Other versions
EP0255475A3 (en
EP0255475B1 (fr
Inventor
Gunther Wulff
Jakob Widrig
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.)
3A Composites International AG
Original Assignee
Alusuisse Holdings AG
Schweizerische Aluminium AG
Alusuisse Lonza Services Ltd
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 Alusuisse Holdings AG, Schweizerische Aluminium AG, Alusuisse Lonza Services Ltd filed Critical Alusuisse Holdings AG
Publication of EP0255475A2 publication Critical patent/EP0255475A2/fr
Publication of EP0255475A3 publication Critical patent/EP0255475A3/de
Application granted granted Critical
Publication of EP0255475B1 publication Critical patent/EP0255475B1/fr
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
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2038—Heating, cooling or lubricating the injection unit

Definitions

  • the present invention relates to a filling sleeve for a hot chamber die casting machine.
  • Die casting machines have been known for a long time. A distinction is made between hot chamber and cold chamber die casting machines.
  • the casting device or metal pump hangs on a carrying device and dips into the crucible in the metal melt, whereby the metal pump is kept at the casting temperature.
  • This filling sleeve essentially consists of a vertically standing pressure cylinder with a pressure piston driven from above by the same carrying device and a so-called gooseneck connected to the lower part of the pressure cylinder, which ensures the connection to the casting mold.
  • the pressure cylinder is attached to the bottom of the crucible and the outlet channel is placed in the wall of this container.
  • pressure cylinders, pressure pistons and goosenecks are made of ferrous metals, eg cast iron, and are therefore only suitable for casting molten metals which do not attack these materials.
  • ferrous metals eg cast iron
  • this condition is generally fulfilled for the die casting of lead, tin and magnesium alloys.
  • zinc alloys however, a solution attack on iron and steel parts is only prevented if they contain aluminum as an alloy component in sufficient amounts, which is why alloys are used for zinc die casting with about 4% aluminum.
  • aluminum and brass melts cannot be cast with hot chamber die casting machines of a known type.
  • the casting set is outside the liquid metal.
  • the pressure chamber is usually arranged horizontally and extends with a constant diameter to the mold dividing surface.
  • the solidified metal residue remaining in the cylinder after the casting process is expelled at or after opening of the mold by moving the pressure piston. This rest has a relatively large volume compared to the casting and therefore means a high waste rate with each casting.
  • the chamber In vertical cold chamber machines, the chamber is closed at the bottom by a counter piston.
  • the melt is ejected laterally through an opening in the cylinder wall to the casting mold; the counter-piston is lowered to remove the solidified metal residue.
  • An important advantage of cold chamber machines is that all die-cast metals and alloys can be cast on them, in particular aluminum alloys and brass, as well as magnesium, zinc, lead and tin alloys.
  • This iron absorption which also partly takes place in the casting mold, may be undesirable for the quality of the casting due to the formation of needle-shaped crystalline iron aluminum precipitates and also represents a problem for the recycling of the die casting waste (E. Brunhuber, loc.cit., P. 326 -327).
  • the attack of the melt on the steel cylinder means a reduction in its service life.
  • a certain remedy is provided by the lubrication of the cylinder wall before each shot.
  • the decomposition of the lubricant in contact with the liquid metal, in particular aluminum produces gases which lead to pore formation in the casting. Therefore, the castings cannot be properly heat treated, which also limits the number of alloys suitable for die casting.
  • the present invention is based on the object of developing a fundamentally new type of hot chamber die casting machine, with which it should be possible to use the hot chamber process also to use aggressive metal melts, such as those made of aluminum alloys, titanium alloys, Cr-Ni steel as well Casting alloys that can be hardened by thermal treatment, and with better quality than can be obtained on cold chamber machines.
  • a structure of the filling sleeve leads, according to which the wall has an outer, coolable metal jacket, in particular made of steel, and an inner ceramic hollow cylinder which is fitted therein and can be heated with integrated heating.
  • the heater is preferably in the vicinity of the inner one Shell surface of the ceramic hollow cylinder arranged.
  • the portion between the heater and the metal jacket acts as thermal insulation.
  • the innermost zones of the ceramic hollow cylinder are brought to operating temperature with the heater and kept at this temperature by means of a thermal probe and a thermostat.
  • This heating can be done by the circulation of a heat transfer medium or by means of electric radiators.
  • the steel jacket is cooled, e.g. kept at a certain temperature by natural or increased air circulation, if necessary by water or oil cooling. Under operating conditions, this results in a temperature gradient falling from the inside to the outside of the filling sleeve.
  • the innermost zones of the ceramic hollow cylinder experience greater thermal expansion than the metal jacket, which, viewed in the radial direction, leads to higher compressive stresses, i.e.
  • Such a self-adjusting pressure preload is desirable because it prevents the pressure exerted on the molten metal in the filling sleeve during the casting process and which also acts radially outwards from leading to tensile stresses in the ceramic hollow cylinder.
  • Suitable materials for the ceramic hollow cylinder are materials which are chemically resistant to aggressive metal melts, in particular aluminum melts, such as silicon nitride, Si-Al-ON, borides and others.
  • the ceramic hollow cylinder is divided into at least two hollow cylinders in the radial direction, in that a pressure-resistant intermediate cylinder made of a ceramic material with a high insulating capacity, e.g. Zirconia or other.
  • the chamber should be as tight as possible.
  • the metal jacket is provided at one end, preferably at its end facing the casting mold, with an inwardly directed annular shoulder, which acts as an axial support for the ceramic hollow cylinder.
  • a displaceable pressure ring which bears against its end face is arranged net, which is under the action of clamping means supported on the metal jacket.
  • an axial pressure is exerted with this clamping device via the pressure ring on the hollow cylinder, or in the case of a multi-layer version at least on the hollow cylinder which determines the tightness of the chamber, which presses the ceramic components tightly against one another.
  • the ceramic lining in particular its inner layer, of course expands not only in the radial but also in the axial direction, which also contributes to the tightness.
  • the filler can described can be arranged horizontally or vertically. If it is arranged horizontally, it is expedient if the annular shoulder is designed immediately as an end plate with an outlet nozzle for the melt, the latter preferably being placed flush with the apex of the chamber. On the chamber side, there is an insulating ceramic lining on this support disk.
  • the warm chamber is formed in the filling sleeve between the support disk and its insulation on the one hand and the pressure piston, which is likewise to be made of ceramic, which can be supplied with the required amount of molten metal via a suitable inlet opening. After the inlet opening has been closed by partially displacing the pressure piston, the air can be evacuated in the casting mold and in the warm chamber by a vacuum pump and only then can the actual casting process be carried out at the most suitable casting speed.
  • the heatable filling can according to the invention offers the following advantages: - Because the metal jacket can be arranged outside the melt storage container, its outer surface does not come into contact with the metal melt and, if there is no protective cladding, needs it. - Because the metal jacket can be kept at a moderate temperature by cooling, for example below 100 ° C, in any case below 300 ° C, there is no risk of soft annealing of the metal used for this. It is therefore possible to use high-strength alloys, including steel, for the production of the metal jacket, and thus to largely limit the thickness of the jacket wall while making full use of the metal strength. - Because the ceramic warm chamber can be kept at operating temperature with the heater, there is no danger that the melt will cool down in it.
  • the melt can be kept at the most suitable temperature for casting.
  • the operations "filling into the chamber”, “evacuating the air”, “degassing the molten metal” and “actual casting process” can be carried out one after the other without mutual interference.
  • the speed of the actual casting process can also be adjusted without risk of cooling in the chamber by considering only the most suitable filling conditions of the casting mold.
  • Fig. 1 the filling sleeve 5 is shown with the mold for a horizontal die casting machine.
  • This device has, in a known manner, a fixed mold platen 1 with the mold plate half 2 fixed thereon and a movable mold platen 3 actuated by a pressure system (not shown) with the movable mold plate half 4 fixed thereon.
  • the filling sleeve 5 according to the invention is fastened to the fixed platen 2, which also has an outlet opening 6 is connected to the pouring system 7 of the actual mold cavity 8 and is further equipped with the displaceable pressure piston 9 for pressing the molten metal located in the chamber 10 of the filling sleeve 5 into the mold.
  • the wall of the filling sleeve 5 can be cooled by an outer, e.g. composed of a steel tube formed metal jacket 11 and an inner ceramic hollow cylinder 12 fitted therein, which has recesses 13 distributed around the circumference for integrated heating.
  • an outer e.g. composed of a steel tube formed metal jacket 11 and an inner ceramic hollow cylinder 12 fitted therein, which has recesses 13 distributed around the circumference for integrated heating.
  • the filling sleeve 5 is fastened to the metal jacket 11, e.g. metal disc 14 screwed therein, the outer surface of which rests on the fixed mold plate half 2.
  • the metal disk 14 bears a ceramic disk 15, against which the end face of the ceramic hollow cylinder 12 lies tightly.
  • the outlet opening 6, which is preferably arranged flush with the upper surface line of the chamber 10, is recessed, which can be lined with a ceramic mouthpiece 16.
  • a small outlet opening (not shown) can be provided in the rear part of the filling sleeve 5, below.
  • the metal jacket is cooled by the ambient air. If this effect is not sufficient, liquid cooling can be provided, e.g. a cooling coil 22 are used.
  • the ceramic hollow cylinder 12 and the ceramic disks 15, or at least the front one of them, are made of a material that is chemically resistant to the melt to be cast, e.g. made of silicon nitride.
  • a material that is chemically resistant to the melt to be cast e.g. made of silicon nitride.
  • the front ceramic disc 15 can be subdivided analogously.
  • the rear ceramic ring 17 then expediently also consists of the ceramic material with a higher thermal insulation capacity.
  • the ceramic hollow cylinder 12 is here divided into concentric cylinders 12a and 12b and these are also divided into individual rings.
  • the inner rings 25 which are made of ceramic material that is resistant to the melt, lie directly against one another on the end face by being under the action of the pressure ring 18 and the clamping nut 19. These rings 25 are decisive for the tightness of the chamber 10.
  • the outer rings 26 made of ceramic material with a higher thermal insulation capacity can have the same length as the rings 25 and also lie against one another on the end face.
  • the insulating material of the rings 26 has a greater expansion coefficient than the material of the inner rings 25. This could occur at the operating temperature and, although the rings 26 assume an average temperature between that of the rings 25 and that of the metal jacket 11 lead that the rings 26 effectively expand more in the axial direction than the inner rings 25 and thereby push them apart, which would be disadvantageous for the tightness of the chamber 10.
  • the rings 26 are made less long than the rings 25, so that, as illustrated in FIG. 2, each is smaller Gap 27 remains between the rings 26. Nevertheless, the rings 26 fulfill their full task be as thermal insulators and support for the inner rings 25. So that the rings 25 always lie correctly in the rings 26, the rings 25 and 26 can be paired for assembly by shrink-fitting and thus inserted into the metal jacket. It is also possible to insert spacers 27 made of a resilient material in the spaces.
  • two ceramic disks 28 and 29 of different diameters made of thermally insulating material and a ceramic disk 30 made of material that is chemically resistant to the melt are formed at the end of the filling sleeve 5 on the casting mold, the two disks 29 and 30 being accommodated in the first ring 26.
  • two perforated disks 31 made of thermally insulating ceramic are arranged at the other end of the filling sleeve 5.
  • This exemplary embodiment also shows that the fresh melt can be filled into the chamber 10 through a thermally insulated riser pipe 32, it being possible for the desired amount of melt to be supplied by a suitable metering device (not shown). The residual melt remaining after the casting process can also be removed from the chamber 10 through this riser pipe 32.
  • Recesses distributed around the circumference serve to introduce the heating power. Different possibilities for the arrangement of electric radiators in a filling box according to FIG. 2 are illustrated in the further FIGS. 3 to 7 (respectively a and b).
  • axial longitudinal bores 36 arranged concentrically within the wall of the rings 25 or, as shown in FIGS. 4a and 4b, 25 axial longitudinal grooves 37 in the lateral surface of these rings 25 milled or left out in the manufacture of these rings.
  • longitudinal grooves 37 can also be arranged in the inner lateral surface of the insulating rings 26, as illustrated in FIGS. 7a and 7b.
  • the current is supplied through a recess through the rear ceramic disk 17 and the pressure ring 18, as shown in FIG. 1.
  • the individual heating elements can be separated by an annular recess, e.g. in the front end face of the disk 17, are electrically connected in parallel, in which case only a single access channel 20 is required for the current supply through the pressure ring 18 and the disks 31.
  • these rings 39 can be produced from a material that is chemically resistant to the melt or from a different material quality, which has even better tribological properties compared to the ceramic material of the pressure piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
EP19870810346 1986-06-27 1987-06-17 Cylindre de remplissage pour machines de coulée sous pression Expired - Lifetime EP0255475B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2609/86 1986-06-27
CH260986 1986-06-27

Publications (3)

Publication Number Publication Date
EP0255475A2 true EP0255475A2 (fr) 1988-02-03
EP0255475A3 EP0255475A3 (en) 1988-10-12
EP0255475B1 EP0255475B1 (fr) 1991-08-07

Family

ID=4237613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870810346 Expired - Lifetime EP0255475B1 (fr) 1986-06-27 1987-06-17 Cylindre de remplissage pour machines de coulée sous pression

Country Status (2)

Country Link
EP (1) EP0255475B1 (fr)
DE (1) DE3771957D1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2228696B (en) * 1987-10-07 1991-09-04 Hitachi Metals Ltd Die casting cylinder
DE4312175A1 (de) * 1993-04-14 1994-10-20 Hotset Heizpatronen Zubehoer Vorrichtung zur Führung des Materialstroms bei Druckgießmaschinen
WO1996029165A1 (fr) * 1995-03-20 1996-09-26 Bayrisches Druckguss-Werk Thurner Gmbh & Co. Kg Moteur a flux transversal a aimant permanent et procede de fabrication correspondant
DE19920802A1 (de) * 1999-05-06 2000-11-09 Ks Aluminium Technologie Ag Giessverfahren unter Verwendung eines Precursorkörpers
US6470550B1 (en) * 1999-11-11 2002-10-29 Shear Tool, Inc. Methods of making tooling to be used in high temperature casting and molding
EP1302261A3 (fr) * 2001-10-12 2003-05-02 ORTMANN Druckgiesstechnik GmbH Giesskammern- Giessbehälter Druckgiesswerkzeuge-Formenbau Chambre de coulée, pour la coulée sous pression de métaux
US20150165521A1 (en) * 2012-07-27 2015-06-18 Pratt & Whitney Services Pte Ltd. Shot sleeve assembly with materials of different coefficients of thermal expansion
WO2017152904A3 (fr) * 2016-03-07 2019-02-28 Ksm Castings Group Gmbh Chambre d'injection d'une machine de coulée sous pression à chambre froide pourvue d'un dispositif de refroidissement, et dispositif de refroidissement
DE102017011321B3 (de) 2017-12-08 2019-05-16 Wieland-Werke Ag Füllkammer für eine Druckgießmaschine
DE102014009565B4 (de) * 2014-06-27 2020-05-20 Wieland-Werke Ag Füllkammer für eine Druckgießmaschine
CN113927014A (zh) * 2021-09-09 2022-01-14 仁兴机械（佛山）有限公司 一种射料装置及其压铸机及其压铸方法
CN114653919A (zh) * 2021-03-30 2022-06-24 上海胜桀精密机械科技有限公司 一种具有加热装置的压铸机料筒

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401029B (de) * 1993-05-03 1996-05-28 Vaillant Gmbh Druckgussmaschine
DE102004024952B4 (de) * 2004-05-21 2008-06-05 Bayerische Motoren Werke Ag Druckgusswerkzeug
CN111151726A (zh) * 2019-12-29 2020-05-15 盐城泰欧昌机械有限公司 一种高效冷却的压铸机熔杯

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201836A (en) * 1964-09-21 1965-08-24 Mount Vernon Die Casting Corp Method of, and apparatus for, die casting metals
US3515203A (en) * 1968-04-29 1970-06-02 Moline Malleable Iron Co Multiple plunger injection cylinder for die casting
US3672440A (en) * 1969-06-13 1972-06-27 Toshiba Machine Co Ltd Apparatus for die casting ferrous metals
GB1323685A (en) * 1969-10-25 1973-07-18 Gkn Group Services Ltd Apparatus for die-casting metals
DE2449428A1 (de) * 1974-10-17 1976-04-29 Hugo Kunz Kolbenkammer fuer druckgiessmaschinen

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2228696B (en) * 1987-10-07 1991-09-04 Hitachi Metals Ltd Die casting cylinder
DE4312175A1 (de) * 1993-04-14 1994-10-20 Hotset Heizpatronen Zubehoer Vorrichtung zur Führung des Materialstroms bei Druckgießmaschinen
WO1996029165A1 (fr) * 1995-03-20 1996-09-26 Bayrisches Druckguss-Werk Thurner Gmbh & Co. Kg Moteur a flux transversal a aimant permanent et procede de fabrication correspondant
US6024158A (en) * 1995-03-20 2000-02-15 Bayrisches Druckguss-Werk Thurner Gmbh & Co. Kg Process for manufacturing diecast parts
DE19920802A1 (de) * 1999-05-06 2000-11-09 Ks Aluminium Technologie Ag Giessverfahren unter Verwendung eines Precursorkörpers
US6470550B1 (en) * 1999-11-11 2002-10-29 Shear Tool, Inc. Methods of making tooling to be used in high temperature casting and molding
EP1302261A3 (fr) * 2001-10-12 2003-05-02 ORTMANN Druckgiesstechnik GmbH Giesskammern- Giessbehälter Druckgiesswerkzeuge-Formenbau Chambre de coulée, pour la coulée sous pression de métaux
US20150165521A1 (en) * 2012-07-27 2015-06-18 Pratt & Whitney Services Pte Ltd. Shot sleeve assembly with materials of different coefficients of thermal expansion
DE102014009565B4 (de) * 2014-06-27 2020-05-20 Wieland-Werke Ag Füllkammer für eine Druckgießmaschine
WO2017152904A3 (fr) * 2016-03-07 2019-02-28 Ksm Castings Group Gmbh Chambre d'injection d'une machine de coulée sous pression à chambre froide pourvue d'un dispositif de refroidissement, et dispositif de refroidissement
DE102017011321B3 (de) 2017-12-08 2019-05-16 Wieland-Werke Ag Füllkammer für eine Druckgießmaschine
CN114653919A (zh) * 2021-03-30 2022-06-24 上海胜桀精密机械科技有限公司 一种具有加热装置的压铸机料筒
CN113927014A (zh) * 2021-09-09 2022-01-14 仁兴机械（佛山）有限公司 一种射料装置及其压铸机及其压铸方法

Also Published As

Publication number Publication date
EP0255475A3 (en) 1988-10-12
DE3771957D1 (de) 1991-09-12
EP0255475B1 (fr) 1991-08-07

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