EP1952914B1 - Device and core for manufacturing a cylinder crank case - Google Patents

Device and core for manufacturing a cylinder crank case Download PDF

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Publication number
EP1952914B1
EP1952914B1 EP07022822A EP07022822A EP1952914B1 EP 1952914 B1 EP1952914 B1 EP 1952914B1 EP 07022822 A EP07022822 A EP 07022822A EP 07022822 A EP07022822 A EP 07022822A EP 1952914 B1 EP1952914 B1 EP 1952914B1
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EP
European Patent Office
Prior art keywords
sand
core
crank case
cylinder crank
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.)
Not-in-force
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EP07022822A
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German (de)
French (fr)
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EP1952914A2 (en
EP1952914A3 (en
Inventor
Herbert Dr. Möding
Steffen Ziegler
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KS Huayu Alutech GmbH
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KS Aluminium Technologie GmbH
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Publication of EP1952914A2 publication Critical patent/EP1952914A2/en
Publication of EP1952914A3 publication Critical patent/EP1952914A3/en
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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
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/24—Accessories for locating and holding cores or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/108—Installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

  • the invention relates to a device for producing a cylinder crankcase in closed-deck construction, with stationary and movable moldings and a sand and / or salt core, wherein the moldings form a Gleßhohlraum and the sand and / or salt core, a water jacket core of the cylinder crankcase forms, is positively held in at least one molded part, wherein one of the molded parts has at least one holding projection and the sand and / or salt core has at least one opening into which a holding projection protrudes into a form-fitting, so that the sand and / or salt core in the device is fixed.
  • the stiffness of a cylinder area of a cylinder crankcase is very much determined by the design of the cylinder deck. If the cylinder cover plate is closed except for the passage of coolant or shaking out of the sand core required for the formation of the water jacket, this is referred to as the closed deck. Since the water jacket here is almost completely closed by the casting material to be filled into the sliding cavity of the device, that is to say in other words the water jacket core is located inside the cylinder crankcase, there is a problem in positioning the sand core in the mold even during the casting process.
  • Arranging cores in the casting mold presents problems in particular in diecasting processes; there is a risk of core displacements during the filling of the melt, such cores which span a greater distance without core support, that is to say without support against the casting surface a high risk of core deformations, which in turn can lead to partial relocation.
  • die casting in the broadest sense. This is to be understood as meaning the conventional die casting process, in which the melt is shot into the mold under pressures of more than 500 bar, but also the squeeze casting process, in which the melt is substantially pressure-less filled into the mold and then submerged high pressure of several 100 bar is brought to solidification, as well as the so-called low pressure process.
  • the pressure-sliding process the dynamic forces of the liquid metal filled in the casting cavity play a crucial role on the sand core with respect to the core displacements.
  • a method for securing against relocation is in the DE 197 52 518 described. Described is a die casting method for producing castings in a casting mold using castable cores, in particular sand or salt cores, whereby nucleation of the cores in the casting process is prevented by using infiltratable bodies for supporting the cores in the casting mold are fixed on the sand or salt core and thus fix the cores in the mold in accordance with the position.
  • a sand core with integrally formed on the sand core lateral elevations is in the EP 1 649 951 described.
  • the elevations are held in the mold parts of the device, so that the sand core is used at the same time to form the water jacket core and to fix the position of the water jacket.
  • a device and a sand core, on which the two-part form of claim 1 is based, is in EP 0 788 855 disclosed.
  • a device and a sand core for producing a cylinder block in closed-deck construction which has a cylinder top plate and is formed with a plurality of laterally juxtaposed cylinder liners water jacket, wherein the water jacket has an upper end, which on the cylinder top plate to Forming the window partially and partially closed by bridge areas.
  • the device consists of several moldings which define a casting cavity for casting the cylinder block.
  • the apparatus has a number of retaining projections extending integrally from a molding to the casting cavity in the axial direction of the cylinder liner, and the sand core is formed with a number of retaining bores complementary to the respective retaining projections and arranged to extend holding protrusions extending into them for holding the sand core at a particular location of the casting cavity during casting.
  • the areas of the sand core into which the retaining projections project have a thickened wall area, so that a sufficient stability of the sand core is ensured.
  • projections are formed on the sand core, which protrude according to the prior art in other moldings of the device and fix the sand core positionally correct. This has the disadvantage that the sand core is thickened in the region of the holding projections protruding into it, which adversely affects a structural design of the water jacket core.
  • the object of the invention is to overcome the disadvantages of the prior art and an apparatus for producing a cylinder crankcase to provide with a sand and / or salt core, which allows a positionally secure positioning of the sand core in the device and which is also inexpensive to manufacture.
  • the object of the invention should be dimensionally stable even with thin-walled sand cores and make no additional core storage required in Schleber Siemensen.
  • the device and the sand core to allow high gating speeds of the casting metal in the die casting process.
  • the object of the invention is achieved in that at least a portion of the retaining projection continues in regions a part of the outer contour of the water jacket core. Due to the construction according to the invention of the sand or salt core and the holding projections on the molded part holding the core, it is now possible to fix the core dimensionally stable even with thin-walled cores on the molded part. In addition, in contrast to the prior art, a more cost-effective production of the sand core is made possible in that only recesses are present as openings in the sand and / or salt core. The reduction of the sand requirement for the sand core also has a cost-reducing effect on the production of the cylinder crankcase.
  • a further advantage results when the at least one retaining projection forms a part of the outer contour of the water jacket core in its entire extent in the direction of the sand and / or salt core. As a result, both the production of the sand and / or salt core and the fixation of the core are facilitated on the molding. If, as proposed by the invention, a complementary geometric profile is formed between the retaining projection and the core, then the core undergoes an additional fixation on the retaining molded part.
  • a sand core 1 and a sand core holding mold part 2 is shown, wherein the sand core 1 is shown in its position in the position as it is held in the apparatus for producing a cylinder crankcase 3.
  • the sand core 1 is shown in its position in the position as it is held in the apparatus for producing a cylinder crankcase 3.
  • the cylinder crankcase 3 is shown in this view from its underside.
  • the indentations 4 in the finished cylinder crankcase form the bearing block for the crankshaft.
  • the molded part 2 of the device is, for example, a stationary molded part 2, so that the sand core 1 is inserted into the device.
  • Holding projections 5 to 12 extend from the lower tool 2 out in the direction of the sand core 1.
  • the retaining projections form 5 to 12 parts of the outer contour of the water jacket core of the cylinder crankcase.
  • the openings in the cylinder cover plate are formed by the retaining projections 5 to 12 of the lower tool 2.
  • the openings 13 serve on the one hand for the passage of water from the cylinder crankcase to the cylinder head and also serve to remove the molding material of the sand core 1 from the cylinder crankcase.
  • the mold cavity 14 between the sand core 1 and the lower tool or holding mold part 2 is filled with cast metal.
  • Cast metal is the usual aluminum and aluminum alloys used for cylinder crankcases, as well as magnesium and magnesium alloys, as well as hybrid forms of the same conceivable.
  • Cast metal is the usual aluminum and aluminum alloys used for cylinder crankcases, as well as magnesium and magnesium alloys, as well as hybrid forms of the same conceivable.
  • Fig. 1 will not be apparent only the position of the sand core 1 in the mold cavity 14 to position the cylinder crankcase 3 positioned correctly but also fixed by means of the retaining projections 5 to 12.
  • the entire extension A as exemplified by the retaining projection 5, a part of the outer contour of the water jacket core 1, 1 'after. That is, the holding projection 5 corresponds in the course of the inner and outer of the outer contour of the water jacket core 1, 1 '.
  • the retaining projection 5 'only in the sand core 1' projects into it and the sand core 1 'extensions 15 which protrude into recesses 16 of the lower tool 2, so that an alternative storage and fixation of the sand core 1' in the device, or the molding 2 'is given.
  • the holding projections 5 to 12 are formed, but the lower tool has on the other hand also cylindrical elevations 17, 18, 19, 20, which form the cylinder bore 17,18, 19, 20 in the finished cylinder crankcase.
  • the mold cavity 21 between the cylinder elevations 17,18,19, 20 and the water jacket 1 is poured with the cylinder crankcase 3 forming light metal material.
  • a further advantage according to the invention results when the interface 22, 23, such as in the example Fig. 1 and Fig. 2 drawn, provided with a geometric profile.
  • Two different geometric profiles between the sand core 1,1 'and the retaining projection 5, 5' to 12 is in the Fig. 3 played.
  • the Fig. 3 shows a sectional view through the holding projection 5, 5 ', and the sand core 1, 1', wherein two different geometric profiles are shown.
  • the two illustrated embodiments are exemplary are.
  • any geometric shapes, such as peaks, bevels, grooves, bulges can be formed as profiles.
  • the prerequisite for this is that the sand core 1,1 'on the holding projection 5, 5' can be pushed.
  • the holding projection 5, 5 ' is conical, and the core 1, 1' possesses a conical recess, so that the sand core 1, 1 'only in its end position on the molded part 2, 2' completely to the holding projections 5, 5 'to 12 is applied.
  • the device consists of stationary and movable moldings, being applied to a middle stationary holding moldings 2, 2 'of the sand core 1, 1'.
  • the laterally mounted movable moldings which can also be designated as a slide, close the casting cavity, in which they move laterally toward the sand core 1.
  • Fig. 4 is a section along the line IV through the sand core 1 and the opening 24 shown.
  • FIG. 4 is the sand core 1,1 'and the punch 26 which is attached to the movable mold half of the device is shown. It is inventively conceivable, as in the Fig. 4 illustrated, the punch 26 against the sand core to put 1.1 'and the sand core 1.1' thus position. Alternatively, it is conceivable to introduce an opening 24 into the sand core 1, 1 ', so that the stamp 26 can be pushed into the sand core 1, 1', as in the upper picture of FIG Fig. 4 shown.
  • the invention can be used for a single-cylinder block as well as for a multi-cylinder block 3.
  • the invention claims a casting method for the production a cylinder crankcase with an apparatus according to any one of claims 1 to 9, wherein the casting method is a die casting method.
  • the casting method is a die casting method.
  • Druckg phone the usual die casting with pressures above 500 bar, a squeeze casting (squeeze casting) can be used, as well as the medium-pressure method used.

Abstract

The crankcase-producing device is composed of fixed and movable half-molds forming a casting cavity (14, 21). The core (1) has apertures into which the holding projections (5, 6, 7, 8, 9, 10, 11, 12) on the mold parts extend, so that the core is fixed in position, thus forming the core for the water jacket of the crankcase.

Description

Die Erfindung betrifft eine Vorrichtung zum Herstellen eines Zylinderkurbelgehäuses in Closed-Deck-Bauweise, mit stationären und beweglichen Formteilen und einem Sand- und/oder Salzkern, wobei die Formteile einen Gleßhohlraum bilden und der Sand- und/oder Salzkern, der einen Wassermantelkern des Zylinderkurbelgehäuses bildet, formschlüssig in mindestens einem Formteil gehalten ist, wobei eines der Formteile zumindest einen Haltevorsprung aufweist und der Sand- und/oder Salzkern mindestens eine Öffnung aufweist, In die der eine Haltevorsprung formschlüssig hinein ragt, so dass der Sand- und /oder Salzkern in der Vorrichtung fixiert ist.The invention relates to a device for producing a cylinder crankcase in closed-deck construction, with stationary and movable moldings and a sand and / or salt core, wherein the moldings form a Gleßhohlraum and the sand and / or salt core, a water jacket core of the cylinder crankcase forms, is positively held in at least one molded part, wherein one of the molded parts has at least one holding projection and the sand and / or salt core has at least one opening into which a holding projection protrudes into a form-fitting, so that the sand and / or salt core in the device is fixed.

Die Steifigkeit eines Zylinderbereichs eines Zylinderkurbelgehäuses wird ganz wesentlich von der Gestaltung des Zylinderdecks bestimmt. Ist die Zylinderdeckplatte bis auf die für den Kühlmittelübertritt beziehungsweise das Ausrütteln des in diesem für die Ausbildung des Wassermantels benötigten Sandkerns geschlossen, so wird als dies Closed-Deck bezeichnet. Da der Wassermantel hierbei nahezu vollständig von dem in den Gleßhohlraum der Vorrichtung einzufüllenden Gießwerkstoff geschlossen wird, dass heißt mit anderen Worten der Wassermantelkern sich im Inneren des Zylinderkurbelgehäuses befindet, besteht ein Problem darin, den Sandkern in der Gießform auch während des Gießvorgangs lagegerecht zu positionieren. Insbesondere bei Druckgießverfahren bereitet das Anordnen von Kernen in der Gießform Probleme, es besteht die Gefahr, dass es beim Einfüllen der Schmelze zu Kernverlagerungen kommt, bei solchen Kernen, die eine größere Strecke ohne Kernlagerung, das heißt ohne Abstützung gegen die Gießformoberfläche überspannen, besteht zu dem ein hohes Risiko von Kerndeformationen, die wiederum zu partiellen Kernverlagerungen führen können. Hierbei ist der Begriff Druckgießverfahren im weitesten Sinne zu verstehen. Hierunter soll das konventionelle Druckgießverfahren, bei dem die Schmelze unter Drücken als mehr als 500 bar, in die Form geschossen wird, aber auch das Pressgieß verfahren (Squeeze Casting) verstanden werden, bei dem die Schmelze im Wesentlichen Drucklos in die Form gefüllt und dann unter hohem Druck von mehreren 100 bar zur Erstarrung gebracht wird, sowie auch das sogenannte Niederdruckverfahren. In den Druckgleßverfahren spielen die dynamischen Kräfte des in den Gießhohlraum eingefüllten flüssigen Metalls auf dem Sandkern, in Bezug auf die Kernverlagerungen eine entscheidende Rolle.The stiffness of a cylinder area of a cylinder crankcase is very much determined by the design of the cylinder deck. If the cylinder cover plate is closed except for the passage of coolant or shaking out of the sand core required for the formation of the water jacket, this is referred to as the closed deck. Since the water jacket here is almost completely closed by the casting material to be filled into the sliding cavity of the device, that is to say in other words the water jacket core is located inside the cylinder crankcase, there is a problem in positioning the sand core in the mold even during the casting process. Arranging cores in the casting mold presents problems in particular in diecasting processes; there is a risk of core displacements during the filling of the melt, such cores which span a greater distance without core support, that is to say without support against the casting surface a high risk of core deformations, which in turn can lead to partial relocation. Here is the Concept to understand die casting in the broadest sense. This is to be understood as meaning the conventional die casting process, in which the melt is shot into the mold under pressures of more than 500 bar, but also the squeeze casting process, in which the melt is substantially pressure-less filled into the mold and then submerged high pressure of several 100 bar is brought to solidification, as well as the so-called low pressure process. In the pressure-sliding process, the dynamic forces of the liquid metal filled in the casting cavity play a crucial role on the sand core with respect to the core displacements.

Ein Verfahren zur Lagesicherungen gegen Kernverlagerungen ist in der DE 197 52 518 beschrieben. Beschrieben ist ein Druckgießverfahren zum Herstellen von Gussteilen in einer Gießform unter Verwendung von nach dem Gießvorgang zerstörbaren Kernen, insbesondere Sand oder Salzkernen, wobei ein Aufschwimmen der Kerne beim Gießvorgang dadurch verhindert wird, dass zum Stützen der Kerne In der Gießform infiltrierbare Körper verwendet werden, die am Sand- oder Salzkern fixiert sind und so die Kerne in der Gießform lagegerecht fixieren.A method for securing against relocation is in the DE 197 52 518 described. Described is a die casting method for producing castings in a casting mold using castable cores, in particular sand or salt cores, whereby nucleation of the cores in the casting process is prevented by using infiltratable bodies for supporting the cores in the casting mold are fixed on the sand or salt core and thus fix the cores in the mold in accordance with the position.

Ein Sandkern mit an den Sandkern einstückig angeformten seitlichen Erhebungen ist in der EP 1 649 951 beschrieben. Die Erhebungen werden hierbei in den Formteilen der Vorrichtung gehalten, so dass der Sandkern gleichzeitig zur Bildung des Wassermantelkerns und zur Fixierung der Lage des Wassermantels dient.A sand core with integrally formed on the sand core lateral elevations is in the EP 1 649 951 described. The elevations are held in the mold parts of the device, so that the sand core is used at the same time to form the water jacket core and to fix the position of the water jacket.

Aus der US 6,415,848 B1 ist eine Vorrichtung zum Gießen eines Zylinderkurbelgehäuses bekannt, bei der mehrere Sandkerne formschlüssig in ein festes, mit den Sandkernen eine Wasserraumkontur bildendes Formteil eingesetzt werden, wodurch eine Entformung des die wasserraurnkontur bildenden Formteils bei einem closed-deck Zylinderkurbeigehäuse ermöglicht wird. Dies erfordert einen erhöhten Herstellaufwand.From the US Pat. No. 6,415,848 B1 a device for casting a cylinder crankcase is known, in which a plurality of sand cores are positively inserted into a solid, with the sand cores forming a water space contour molding, whereby a demolding of the water space contours forming molding is made possible in a closed-deck cylinder crawler housing. This requires an increased manufacturing costs.

Zusätzlich ist aus der JP1178361 eine Vorrichtung zum Herstellen eines Zylinderkurbelgehäuses in Closed-Deck-Bauweise bekannt, bei dem Sandkerne über Haltestangen beim Gießen gehalten werden. Zusätzlich greifen Vorsprünge des Sandkerns in entsprechend geformte Vorsprünge eines beweglichen Formteils. Dies dient der korrekten Lagebestimmung des Kerns.In addition is from the JP1178361 a device for producing a cylinder crankcase in closed-deck construction, in which Sand cores are held over handrails while casting. In addition, projections of the sand core engage correspondingly shaped projections of a movable molding. This serves for the correct orientation of the core.

Eine Vorrichtung und ein Sandkern, auf der die zweiteilige Form des Anspruchs 1 basiert, ist in der EP 0 788 855 offenbart. Offenbart ist eine Vorrichtung und ein Sandkern zum Herstellen eines Zylinderblocks in Closed-Deck-Bauweise, der eine Zylinderdeckplatte aufweist und mit einem eine Mehrzahl von seitlich nebeneinander angeordneten Zylinderlaufbuchsen umgebenen Wassermantel ausgebildet ist, wobei der Wassermantel ein oberes Ende aufweist, das an der Zylinderdeckplatte zum Bilden des Fensters teilweise und durch Brückenbereiche teilweise geschlossen ist. Die Vorrichtung besteht hierbei aus mehreren Formteilen, die in sich einen Gießhohlraum zum Gießen des Zylinderblocks definieren. Die Vorrichtung weist eine Anzahl von Haltevorsprüngen auf, die sich integral von einem Formteil zu dem Gießhohlraum hin in axialer Richtung der Zylinderlaufbuchse erstrecken und der Sandkern mit einer Anzahl von Haltebohrungen ausgebildet ist, die zu den jeweiligen Haltevorsprüngen komplementär und derart angeordnet sind, dass sie sich in sie hinein erstreckenden Haltevorsprünge zum Halten des Sandkerns an einer bestimmten Stelle des Gießhohlraums während des Gießens halten. Die Bereiche des Sandkerns, in die die Haltevorsprünge hineinragen, besitzen einen verdickten Wandbereich, so dass eine ausreichende Stabilität des Sandkerns gewährleistet ist. Neben der axialen Fixierung des Sandkerns durch die Haltevorsprünge sind am Sandkern Kernvorsprünge ausgebildet, die gemäß dem Stand der Technik in weitere Formteile der Vorrichtung hineinragen und den Sandkern lagegerecht fixieren. Nachteilig hieran ist, dass der Sandkern im Bereich der in ihn hineinragenden Haltevorsprünge verdickt auszubilden ist, was eine konstruktive Auslegung des Wassermantelkerns nachteilig beeinflusst.A device and a sand core, on which the two-part form of claim 1 is based, is in EP 0 788 855 disclosed. Disclosed is a device and a sand core for producing a cylinder block in closed-deck construction, which has a cylinder top plate and is formed with a plurality of laterally juxtaposed cylinder liners water jacket, wherein the water jacket has an upper end, which on the cylinder top plate to Forming the window partially and partially closed by bridge areas. The device consists of several moldings which define a casting cavity for casting the cylinder block. The apparatus has a number of retaining projections extending integrally from a molding to the casting cavity in the axial direction of the cylinder liner, and the sand core is formed with a number of retaining bores complementary to the respective retaining projections and arranged to extend holding protrusions extending into them for holding the sand core at a particular location of the casting cavity during casting. The areas of the sand core into which the retaining projections project have a thickened wall area, so that a sufficient stability of the sand core is ensured. In addition to the axial fixation of the sand core by the holding projections core projections are formed on the sand core, which protrude according to the prior art in other moldings of the device and fix the sand core positionally correct. This has the disadvantage that the sand core is thickened in the region of the holding projections protruding into it, which adversely affects a structural design of the water jacket core.

Aufgabe der Erfindung ist es, die Nachteile aus dem Stand der Technik zu überwinden und eine Vorrichtung zum Herstellen eines Zylinderkurbelgehäuses mit einem Sand- und/oder Salzkern bereitzustellen, die ein lagesicheres Positionieren des Sandkerns in der Vorrichtung ermöglicht und der darüber hinaus kostengünstig zu fertigen ist. Darüber hinaus soll der Gegenstand der Erfindung auch bei dünnwandigen Sandkernen maßstabil sein und keine zusätzliche Kernlagerung in Schleberbereichen erforderlich machen. Darüber hinaus soll die Vorrichtung und der Sandkern hohe Anschnittsgeschwindigkeiten des Gießmetalls im Druckgießprozess ermöglichen.The object of the invention is to overcome the disadvantages of the prior art and an apparatus for producing a cylinder crankcase to provide with a sand and / or salt core, which allows a positionally secure positioning of the sand core in the device and which is also inexpensive to manufacture. In addition, the object of the invention should be dimensionally stable even with thin-walled sand cores and make no additional core storage required in Schleberbereichen. In addition, the device and the sand core to allow high gating speeds of the casting metal in the die casting process.

Die Aufgabe der Erfindung wird dadurch gelöst, dass zumindest ein Abschnitt des Haltevorsprungs bereichsweise einen Teil der Außenkontur des Wassermantelkerns fortsetzt. Durch den erfindungsgemäßen Aufbau des Sand- oder Salzkerns und der Haltevorsprünge auf dem den Kern haltenden Formteil ist nun die Möglichkeit geschaffen, den Kern maßstabil auch bei dünnwandigen Kernen auf dem Formteil zu fixieren. Darüber hinaus wird im Gegensatz zum Stand der Technik eine kostengünstigere Herstellung des Sandkerns ermöglicht, dadurch dass lediglich Ausnehmungen als Öffnungen im Sand und/oder Salzkern vorhanden sind. Auch die Verringerung des Sandbedarfs für den Sandkern wirkt sich kostenmindernd auf die Herstellung der Zylinderkurbelgehäuse aus.The object of the invention is achieved in that at least a portion of the retaining projection continues in regions a part of the outer contour of the water jacket core. Due to the construction according to the invention of the sand or salt core and the holding projections on the molded part holding the core, it is now possible to fix the core dimensionally stable even with thin-walled cores on the molded part. In addition, in contrast to the prior art, a more cost-effective production of the sand core is made possible in that only recesses are present as openings in the sand and / or salt core. The reduction of the sand requirement for the sand core also has a cost-reducing effect on the production of the cylinder crankcase.

Ein weiterer Vorteil ergibt sich dann, wenn der zumindest eine Haltevorsprung In seiner gesamten Ausdehnung In Richtung des Sand- und/oder Salzkern einen Teil der Außenkontur des Wassermantelkerns bildet. Hierdurch werden sowohl die Herstellung des Sand- und/oder Salzkerns als auch die Fixierung des Kerns auf dem Formteil erleichtert. Wird, wie erfindungsgemäß vorgeschlagen, zwischen dem Haltevorsprung und dem Kern ein komplementäres geometrisches Profil ausgebildet, so erfährt der Kern eine zusätzliche Fixierung auf dem haltenden Formteil.A further advantage results when the at least one retaining projection forms a part of the outer contour of the water jacket core in its entire extent in the direction of the sand and / or salt core. As a result, both the production of the sand and / or salt core and the fixation of the core are facilitated on the molding. If, as proposed by the invention, a complementary geometric profile is formed between the retaining projection and the core, then the core undergoes an additional fixation on the retaining molded part.

Nachfolgend wird die Erfindung anhand von Skizzen in einem Ausführungsbeispiel anhand einer Vorrichtung mit Sandkern näher erläutert. Es zeigt:

  • Fig.1 eine dreidimensionale Ansicht auf einen erfindungsgemäß ausgebildeten Sandkern in einem Formteil, mit angedeutetem Zylinderkurbelgehäuse,
  • Fig. 2 eine Detailansicht in einem Bereich eine Zylinderbohrung,
  • Fig. 3 eine Detallansicht gemäß dem Schnitt III aus Fig. 1 in einem Bereich zwischen Haltevorsprung und Sandkern und
  • Fig.4 eine Detailansicht gemäß dem, Schnitt IV aus Fig. 1 im Bereich einer Öffnung beziehungsweise Ausnehmung im Sandkern.
The invention will be explained in more detail with reference to drawings in an embodiment with reference to a device with sand core. It shows:
  • Fig.1 3 shows a three-dimensional view of a sand core formed according to the invention in a molded part, with an indicated cylinder crankcase,
  • Fig. 2 a detailed view in a region of a cylinder bore,
  • Fig. 3 a detailed view according to the section III from Fig. 1 in an area between retaining projection and sand core and
  • Figure 4 a detailed view according to the, section IV Fig. 1 in the region of an opening or recess in the sand core.

In der Fig. 1 ist ein Sandkern 1 und ein den Sandkern haltendes Formteil 2 dargestellt, wobei der Sandkern 1 in seiner Lage in der Lage dargestellt ist, wie er in der Vorrichtung zum Herstellen eines Zylinderkurbelgehäuses 3 gehalten ist. Als Strich-Punkt-Linie ist darin die Lage des Sandkerns in Bezug auf ein Zylinderkurbelgehäuse 3 wiedergegeben. Das Zylinderkurbelgehäuse 3 ist in dieser Ansicht von seiner Unterseite her dargestellt. So bilden die Einbuchtungen 4 im fertigen Zylinderkurbelgehäuse den Lagerstuhl für die Kurbelwelle. Das Formteil 2 der Vorrichtung ist beispielsweise ein stationäres Formteil 2, auf dass der Sandkern 1 in die Vorrichtung eingelegt wird. Dabei reichen Haltevorsprünge 5 bis 12 aus dem Unterwerkzeug 2 heraus in Richtung des Sandkerns 1. Hierbei bilden die Haltevorsprünge 5 bis 12 Teile der Außenkontur des Wassermantelkerns des Zylinderkurbelgehäuses aus. Erfindungsgemäß werden die Öffnungen in der Zylinderdeckplatte durch die Haltevorsprünge 5 bis 12 des Unterwerkzeugs 2 gebildet. Die Öffnungen 13 dienen einerseits zum Durchtritt des Wassers vom Zylinderkurbelgehäuse zum Zylinderkopf und dienen darüber hinaus dazu den Formwerkstoff des Sandkerns 1 aus dem Zylinderkurbelgehäuse zu entfernen.In the Fig. 1 a sand core 1 and a sand core holding mold part 2 is shown, wherein the sand core 1 is shown in its position in the position as it is held in the apparatus for producing a cylinder crankcase 3. As a dash-and-dot line, the position of the sand core with respect to a cylinder crankcase 3 is reproduced therein. The cylinder crankcase 3 is shown in this view from its underside. Thus, the indentations 4 in the finished cylinder crankcase form the bearing block for the crankshaft. The molded part 2 of the device is, for example, a stationary molded part 2, so that the sand core 1 is inserted into the device. Holding projections 5 to 12 extend from the lower tool 2 out in the direction of the sand core 1. In this case, the retaining projections form 5 to 12 parts of the outer contour of the water jacket core of the cylinder crankcase. According to the invention, the openings in the cylinder cover plate are formed by the retaining projections 5 to 12 of the lower tool 2. The openings 13 serve on the one hand for the passage of water from the cylinder crankcase to the cylinder head and also serve to remove the molding material of the sand core 1 from the cylinder crankcase.

Der Formhohlraum 14 zwischen dem Sandkern 1 und dem Unterwerkzeug oder haltenden Formteils 2 wird mit Gießmetall gefüllt. Als Gießmetall sind die üblichen für Zylinderkurbelgehäuse verwendeten Aluminium und Aluminiumlegierungen, sowie Magnesium und Magnesiumlegierungen, sowie hybride Formen derselben vorstellbar. Wie aus der Fig. 1 ersichtlich, wird nicht nur die Lage des Sandkerns 1 im Formhohlraum 14 zur Bildung des Zylinderkurbelgehäuses 3 lagegerecht positioniert sondern mittels der Haltevorsprünge 5 bis 12 auch fixiert.The mold cavity 14 between the sand core 1 and the lower tool or holding mold part 2 is filled with cast metal. Cast metal is the usual aluminum and aluminum alloys used for cylinder crankcases, as well as magnesium and magnesium alloys, as well as hybrid forms of the same conceivable. Like from the Fig. 1 will not be apparent only the position of the sand core 1 in the mold cavity 14 to position the cylinder crankcase 3 positioned correctly but also fixed by means of the retaining projections 5 to 12.

In der in der Fig. 1 dargestellten Ausführungsform bildet die gesamte Ausdehnung A, wie beispielhaft an dem Haltevorsprung 5 dargestellt, einen Teil der Außenkontur des Wassermantelkerns 1, 1' nach. Das heißt der Haltevorsprung 5 entspricht im Verlauf der inneren und äußeren der Außenkontur des Wassermantelkerns 1, 1'. Alternativ ist es vorstellbar, und wie in der Fig. 2 dargestellt, dass der Haltevorsprung 5' lediglich in den Sandkern 1' hinein ragt und der Sandkern 1' Verlängerungen 15 aufweist, die in Ausnehmungen 16 des Unterwerkzeugs 2-hineinragen, so dass eine alternative Lagerung und Fixierung des Sandkerns 1' in der Vorrichtung, beziehungsweise dem Formteil 2' gegeben ist.In the in the Fig. 1 illustrated embodiment, the entire extension A, as exemplified by the retaining projection 5, a part of the outer contour of the water jacket core 1, 1 'after. That is, the holding projection 5 corresponds in the course of the inner and outer of the outer contour of the water jacket core 1, 1 '. Alternatively, it is conceivable, and as in the Fig. 2 shown that the retaining projection 5 'only in the sand core 1' projects into it and the sand core 1 'extensions 15 which protrude into recesses 16 of the lower tool 2, so that an alternative storage and fixation of the sand core 1' in the device, or the molding 2 'is given.

Am Formteil, beziehungsweise Unterwerkzeug 2 sind einerseits die Haltevorsprünge 5 bis 12 ausgebildet, das Unterwerkzeug besitzt aber anderseits auch zylindrische Erhebungen 17, 18, 19, 20, die im fertigen Zylinderkurbelgehäuse die Zylinderbohrung 17,18, 19, 20 bilden. Der Formhohlraum 21 zwischen den Zylindererhebungen 17,18,19, 20 und dem Wassermantel 1 wird mit dem das Zylinderkurbelgehäuse 3 bildenden Leichtmetallwerkstoff ausgegossen.On the molding, or lower tool 2 on the one hand, the holding projections 5 to 12 are formed, but the lower tool has on the other hand also cylindrical elevations 17, 18, 19, 20, which form the cylinder bore 17,18, 19, 20 in the finished cylinder crankcase. The mold cavity 21 between the cylinder elevations 17,18,19, 20 and the water jacket 1 is poured with the cylinder crankcase 3 forming light metal material.

Ein weiterer erfindungsgemäßer Vorteil ergibt sich dann, wenn die Grenzfläche 22, 23, wie beispielhaft In die Fig. 1 und Fig. 2 eingezeichnet, mit einem geometrischen Profil versehen ist. Zwei unterschiedliche geometrische Profile zwischen dem Sandkern 1,1' und dem Haltevorsprung 5, 5' bis 12 ist in der Fig. 3 wiedergegeben. Die Fig. 3 zeigt eine Schnittdarstellung durch den Haltevorsprung 5, 5', sowie den Sandkern 1, 1', wobei zwei unterschiedliche geometrische Profile dargestellt sind. In einer Ausführungsform ragt der Sandkern 1,1' in den Haltevorsprung 5, 5' hinein und in einer anderen Ausführungsform ragt der Haltevorsprung 5, 5' in den Sandkern 1,1' hinein. Es ist selbstverständlich, dass die beiden dargestellten Ausführungsformen beispielhaft sind. Es sind selbstverständlich beliebige geometrische Formen, wie Spitzen, Schrägen, Nuten, Wölbungen als Profile ausbildbar. Voraussetzung hierfür ist, dass der Sandkern 1,1' auf den Haltevorsprung 5, 5' aufschiebbar ist. Hierbei ist es erfindungsgemäß auch vorstellbar, dass der Haltevorsprung 5, 5' konisch ausgebildet ist, sowie der Kern 1, 1' eine konische Ausnehmung besitz, so dass der Sandkern 1,1'lediglich in seiner Endstellung auf dem Formteil 2, 2' vollständig an den Haltevorsprüngen 5, 5' bis 12 anliegt.A further advantage according to the invention results when the interface 22, 23, such as in the example Fig. 1 and Fig. 2 drawn, provided with a geometric profile. Two different geometric profiles between the sand core 1,1 'and the retaining projection 5, 5' to 12 is in the Fig. 3 played. The Fig. 3 shows a sectional view through the holding projection 5, 5 ', and the sand core 1, 1', wherein two different geometric profiles are shown. In one embodiment, the sand core 1, 1 'protrudes into the retaining projection 5, 5' and in another embodiment the retaining projection 5, 5 'protrudes into the sand core 1, 1'. It goes without saying that the two illustrated embodiments are exemplary are. Of course, any geometric shapes, such as peaks, bevels, grooves, bulges can be formed as profiles. The prerequisite for this is that the sand core 1,1 'on the holding projection 5, 5' can be pushed. Here, it is also conceivable according to the invention that the holding projection 5, 5 'is conical, and the core 1, 1' possesses a conical recess, so that the sand core 1, 1 'only in its end position on the molded part 2, 2' completely to the holding projections 5, 5 'to 12 is applied.

Die Vorrichtung besteht aus stationären und beweglichen Formteilen, wobei auf ein mittleres stationäres haltendes Formteile 2, 2' der Sandkern 1,1'aufgebracht wird. Die seitlich angebrachten beweglichen Formteile, die auch als Schieber bezeichenbar sind, verschließen den Gießhohlraum, in dem sie sich seitlich an den Sandkern 1 heran bewegen. Erfingdungsgemäß wird nun vorgeschlagen, in den Sandkern 1,1' Öffnungen, oder Vertiefungen 24, 25 einzubringen und zur zusätzlichen Kernlagerung zusätzliche Erhebungen oder Stempel 26 an den beweglichen Formteilen zu befestigen, die in die Öffnungen 24, 25 bei geschlossenem Werkzeug beziehungsweise geschlossener Vorrichtung in den Sandkern 1 hineinragen um diesen lagegerecht in der Gießvorrichtung zu positionieren. In der Fig. 4 ist ein Schnitt gemäß der Linie IV durch den Sandkern 1 und die Öffnung 24 dargestellt. Auch in diesem Fall werden erfindungsgemäß zwei alternative Ausführungsformen beschrieben. In der Fig. 4 ist der Sandkern 1,1' sowie der Stempel 26, der an der beweglichen Formhälfte der Vorrichtung befestigt ist dargestellt. Es ist erfindungsgemäß vorstellbar, wie in der Fig. 4 dargestellt, dem Stempel 26 gegen den Sandkern 1,1' anzulegen und den Sandkern 1,1' somit zu positionieren. Alternativ ist es vorstellbar, in den Sandkern 1, 1' eine Öffnung 24 einzubringen, so dass der Stempel 26 in den Sandkern 1, 1' hinein schiebbar ist, wie im oberen Bild der Fig. 4 dargestellt.The device consists of stationary and movable moldings, being applied to a middle stationary holding moldings 2, 2 'of the sand core 1, 1'. The laterally mounted movable moldings, which can also be designated as a slide, close the casting cavity, in which they move laterally toward the sand core 1. According to the invention, it is now proposed to introduce into the sand core 1, 1 'openings or recesses 24, 25 and to secure additional elevations or punches 26 to the additional core bearing 26 on the movable moldings in the openings 24, 25 with closed tool or closed device in protrude the sand core 1 to position this positionally correct in the casting device. In the Fig. 4 is a section along the line IV through the sand core 1 and the opening 24 shown. Also in this case two alternative embodiments are described according to the invention. In the Fig. 4 is the sand core 1,1 'and the punch 26 which is attached to the movable mold half of the device is shown. It is inventively conceivable, as in the Fig. 4 illustrated, the punch 26 against the sand core to put 1.1 'and the sand core 1.1' thus position. Alternatively, it is conceivable to introduce an opening 24 into the sand core 1, 1 ', so that the stamp 26 can be pushed into the sand core 1, 1', as in the upper picture of FIG Fig. 4 shown.

Die Erfindung ist für einen Einzelzylinderblock wie auch für einen Mehrzylinderblock 3 einsetzbar.The invention can be used for a single-cylinder block as well as for a multi-cylinder block 3.

Darüber hinaus beansprucht die Erfindung ein Gießverfahren zur Herstellung eines Zylinderkurbelgehäuses mit einer Vorrichtung gemäß einem der Ansprüche 1 bis 9, wobei das Gießverfahren ein Druckgießverfahren ist. Als Druckgießverfahren sind die üblichen Druckgießverfahren mit Drücken über 500 bar, ein Pressgießverfahren (Squeeze-Casting) verwendbar, wie auch die Mitteldruckverfahren einsetzbar.In addition, the invention claims a casting method for the production a cylinder crankcase with an apparatus according to any one of claims 1 to 9, wherein the casting method is a die casting method. As Druckgießverfahren the usual die casting with pressures above 500 bar, a squeeze casting (squeeze casting) can be used, as well as the medium-pressure method used.

Claims (10)

  1. A device for making a cylinder crank case (3) in closed deck design, comprising stationary and mobile mold parts (2, 2') and a sand and/or a salt core (1, 1'), wherein the mold parts (2, 2') form a casting cavity (14, 21) and the sand and/or salt core (1, 1') defining a water jacket core (1, 1') of the cylinder crank case (3) is held in a form-fitting manner in at least one mold part, wherein one of the mold parts (2, 2') comprises at least one holding projection (5 to 12) and the sand and/or salt core (1, 1') has at least one opening into which said one holding projection (5 to 12) projects in a form-fitting manner so that the sand and/or salt core is fixed in the device,
    characterized in that
    at least a section of the holding projection (5 to 12) forms a zonal continuation of the outer contour of the water jacket core (1, 1').
  2. The device for making a cylinder crank case of claim 1, characterized in that, over its entire extension towards the sand and/or salt core (1, 1'), the at least one holding projection (5 to 12) forms a part of the outer contour of the water jacket core (1, 1') of the cylinder crank case.
  3. The device for making a cylinder crank case of one of claims 1 or 2, characterized in that the at least one holding projection (5 to 12) corresponds in thickness to the thickness of the sand and/or salt core (1, 1') so that at least one holding projection (5, 12) forms a radially inward and a radially outward part of the outer contour of the water jacket core (1, 1') of the cylinder crank case.
  4. The device for making a cylinder crank case of one of claims 1 to 3, characterized in that the at least one holding projection (5 to 12) defines an opening in the cylinder crank case, said opening serving to allow the passage of water from the cylinder crank case to a cylinder head.
  5. The device for making a cylinder crank case of one of claims 1 to 4, characterized in that a complementary geometric profile is formed between the at least one holding projection (5 to 12) and the sand and/or salt core (1, 1') so that the sand and/or salt core (1, 1') is given an additional fixation on the mold part (2, 2') holding the same.
  6. The device for making a cylinder crank case of one of claims 1 to 5, characterized in that the sand and/or salt core (1, 1') exclusively contacts said at least one holding projection (5 to 12) or contacts the at least one holding projection (5 to 12) and the mold part (2, 2') holding the same.
  7. The device for making a cylinder crank case of claim 6, characterized in that the sand and/or salt core (1, 1') protrudes into a correspondingly shaped recess (16) in the mold part (2, 2') holding the same.
  8. The device for making a cylinder crank case of one of claims 1 to 7, characterized in that the sand and/or salt core (1, 1') comprises at least one further opening (24, 25) into which another movable mold part (26) can be inserted so that the sand and/or salt core (1, 1') is given additional axial guiding in the direction of a cylinder bore (17, 18, 19, 20).
  9. The device for making a cylinder crank case of one of claims 1 to 8, characterized in that a plurality of sand and/or salt cores (1, 1') are held in a device to form one or more water jackets.
  10. A method for making a cylinder crank case using a device according to one of claims 1 to 9, characterized in that the cylinder crank case is made by die casting, squeeze casting or low-pressure die casting.
EP07022822A 2007-01-22 2007-11-24 Device and core for manufacturing a cylinder crank case Not-in-force EP1952914B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007004050A DE102007004050B4 (en) 2007-01-22 2007-01-22 Device for producing a cylinder crankcase

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EP1952914A2 EP1952914A2 (en) 2008-08-06
EP1952914A3 EP1952914A3 (en) 2009-11-11
EP1952914B1 true EP1952914B1 (en) 2012-02-22

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EP07022822A Not-in-force EP1952914B1 (en) 2007-01-22 2007-11-24 Device and core for manufacturing a cylinder crank case

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DE102010025285A1 (en) * 2010-06-28 2011-12-29 Nemak Linz Gmbh Continuous casting mold for casting castings from a molten metal
CN102179476B (en) * 2011-03-30 2013-02-20 潍柴动力股份有限公司 Core assembly mould
DE102015212518A1 (en) * 2015-07-03 2017-01-05 Volkswagen Aktiengesellschaft Process for producing a light metal cast component by die casting or die casting and salt core with metallic core marks
CN107199312B (en) * 2017-07-13 2023-05-09 广西玉柴机器股份有限公司 Rapid casting and forming method of integrated cylinder cover
CN110548856B (en) * 2019-10-10 2021-09-07 北京航星机器制造有限公司 Composite casting mold of aluminum alloy shell casting and forming method thereof
DE102020127931A1 (en) * 2020-10-23 2022-04-28 Bayerische Motoren Werke Aktiengesellschaft Method for producing a molded part, molded part and method for producing a component
CN113547086A (en) * 2021-07-08 2021-10-26 上柴动力海安有限公司 V-shaped diesel engine matching box sample plate and using method
CN114799075B (en) * 2022-05-13 2024-04-16 中国第一汽车股份有限公司 Core assembly clamp for cylinder block casting core assembly vertical casting process and use method of core assembly clamp

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JP2505229B2 (en) * 1987-12-09 1996-06-05 日産自動車株式会社 How to hold a collapsible storage core
JP3135373B2 (en) * 1992-08-07 2001-02-13 日産自動車株式会社 Jig for positioning and mounting of collapsible core
JP3274069B2 (en) 1996-02-09 2002-04-15 リョービ株式会社 Combination of closed deck type cylinder block casting device and sand core used in the device
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DE102007004050A1 (en) 2008-07-31
EP1952914A2 (en) 2008-08-06
EP1952914A3 (en) 2009-11-11
DE102007004050B4 (en) 2010-03-18
ATE546245T1 (en) 2012-03-15

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