EP0356768B1 - Light metal castings piece, especially die casting piece - Google Patents
Light metal castings piece, especially die casting piece Download PDFInfo
- Publication number
- EP0356768B1 EP0356768B1 EP19890114611 EP89114611A EP0356768B1 EP 0356768 B1 EP0356768 B1 EP 0356768B1 EP 19890114611 EP19890114611 EP 19890114611 EP 89114611 A EP89114611 A EP 89114611A EP 0356768 B1 EP0356768 B1 EP 0356768B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- casting piece
- piece
- fixing means
- light metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0085—Materials for constructing engines or their parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/14—Casting in, on, or around objects which form part of the product the objects being filamentary or particulate in form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/16—Fibres
Definitions
- the invention is based on the preamble of claim 1 from EP-A-0 129 266.
- This document shows and describes a light metal casting with a cast part arranged over a fiber insert, the fiber insert tightly enclosing the cast part.
- Fastening means designed as castings are also known in the prior art, the arrangement of which serves to increase the strength of the connection between the casting and the fastening means by pouring in.
- this increase in strength is limited, in particular, by the grain formation when the casting cools in the vicinity of the fastening means.
- the invention has for its object to show an arrangement in a light metal casting with cast-in fastener, with which a high-strength connection between the cast part and the cast-in fastener can be achieved.
- the invention brings a particular increase in strength to a casting made from a magnesium alloy.
- the fiber insert is advantageously designed as a simple molded body, in particular in the case of a fastening means with a radially symmetrical end region for anchoring in the casting.
- the molded body comprises long fibers which are combined with short fibers in an end region facing the fastening means, the short fibers preferably being arranged transversely to the long fibers.
- the strength of the light metal casting is advantageously increased via the long fibers, the course of the long fibers serving to even out the load in the light metal casting which is introduced via the fastening means.
- the short fibers which are preferably arranged transversely to the long fibers, ensure that a large number of short fiber ends serve as grain formers for a fine-grained material structure in the zone between the fiber insert and the fastening means.
- the short fibers which are preferably arranged transversely to the long fibers, have an advantageous action against a crystal dislocation of the material structure, so that in the zone between the fiber insert and the fastening means a strength exceeding the usual values of the casting material is certainly achieved.
- the fastening means can are optimally used, the load introduced via the fastener is evened out over the long fibers in the casting. Overall, high material utilization is achieved.
- a preferred embodiment of the shaped body described above is achieved in a further embodiment with a tubular shaped body made of long fibers, which is connected to short fibers in two, preferably aligned, fastening regions adjacent end regions.
- a considerable part of the fuel flow through the fibers is advantageously conducted through the housing and local stress peaks in the casting are avoided.
- the shaped body is stiff in accordance with a further feature of the last-mentioned proposal for placement in a casting mold.
- the arrangement of fasteners according to the invention in connection with tubular fiber inserts can thus also be used with large, complicated castings, such as, for example, in a machine housing, in particular made of a magnesium alloy.
- Fiber hoses are known per se from DE-AS 1 282 245.
- the invention is described with reference to a preferred exemplary embodiment of an internal combustion engine housing with a divided main bearing shown in cross section.
- An internal combustion engine housing 1 comprises a crankcase 2 with a divided main bearing 3 for a crankshaft, not shown.
- the main bearing 3 consists of a housing-integrated bearing part 4 in a transverse wall 5 of the crankcase 2 and a separate main bearing cover 6. This is attached to the transverse wall 5 by means of bolts 7, the bolts 7 engaging in the bearing part 4 adjacent threaded bushings 8.
- the threaded bushings 8 are made of an iron material, while the internal combustion engine housing 1 is made of a magnesium alloy.
- the threaded bushings 8 are arranged coaxially and at a radial distance in a tubular or tubular shaped body 9 made of fibers.
- the molded body 9 serving as a fiber insert in the internal combustion engine housing 1 or in the transverse wall 5 comprises long fibers 10 which are combined with short fibers 11 in the area of the threaded bushing 8.
- the short fibers 11 are arranged transversely to the long fibers 10 and at a radial distance from the threaded bushing 8. Between the short fibers 11 and the threaded bush 8 there remains an essentially fiber-free zone 12 consisting of the cast material or the magnesium alloy.
- the radially inward end regions of the short fibers 11 act as grain formers during the cooling of the light metal casting and cause the formation of a very fine-grained casting material in this zone 12.
- the casting material in zone 12 achieves significantly higher strength values than in the zone 12 in the other areas of the cast part or the internal combustion engine housing 1.
- a higher load capacity of the threaded bushing 8 or the fastening means is achieved, or it can be better by smaller dimensions with constant loading of the material of the fastening means, such as the threaded bushing 8 and the screw bolt 7 be exploited.
- the molded body 9 can have long fibers 10 of correspondingly long design in accordance with the respective load.
- tie rods 13, which are arranged in alignment with the screw bolts 7 for the main bearing cover 6, are provided for connecting a cylinder head (not shown).
- the aligned arrangement of a screw bolt 7 with a tie rod 13 enables the design of a tubular shaped body 9 with continuous long fibers 10, the long fibers 10 in the connection area of the tie rods 13 also being connected to short fibers 11 to form a high-strength zone 12.
- the tie rods 13, provided with a conventional thread can either be cast in the internal combustion engine housing 1 or can be mounted separately. In both cases, the load-bearing thread is arranged in the area of the high-strength, fine-grained zone.
- the molded body 9 is stiff.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Insertion Pins And Rivets (AREA)
Description
Die Erfindung geht nach dem Oberbegriff des Patentanspruches 1 von der EP-A-0 129 266 aus.The invention is based on the preamble of claim 1 from EP-A-0 129 266.
Diese Schrift zeigt und beschreibt ein Leichtmetall-Gußteil mit einem über eine Fasereinlage angeordneten Eingußteil, wobei die Fasereinlage das Eingußteil dicht umschließt.This document shows and describes a light metal casting with a cast part arranged over a fiber insert, the fiber insert tightly enclosing the cast part.
Weiter sind im Stand der Technik als Eingußteile gestaltete Befestigungsmittel bekannt, deren Anordnung durch Eingießen der Steigerung der Festigkeit der Verbindung von Gußteil und Befestigungsmittel dient. Dieser Festigkeitssteigerung sind jedoch insbesondere durch die Kornbildung beim Abkühlen des Gußteiles im Umfeld des Befestigungsmittels Grenzen gesetzt.Fastening means designed as castings are also known in the prior art, the arrangement of which serves to increase the strength of the connection between the casting and the fastening means by pouring in. However, this increase in strength is limited, in particular, by the grain formation when the casting cools in the vicinity of the fastening means.
Der Erfindung liegt die Aufgabe zugrunde, bei einem Leichtmetall-Gußteil mit eingegossenem Befestigungsmittel eine Anordnung aufzuzeigen, mit der eine hochfeste Verbindung zwischen dem Gußteil und dem eingegossenen Befestigungsmittel erreichbar ist.The invention has for its object to show an arrangement in a light metal casting with cast-in fastener, with which a high-strength connection between the cast part and the cast-in fastener can be achieved.
Diese Aufgabe wird mit dem kennzeichnenden Merkmal des Patentanspruches 1 dadurch gelöst, daß ein als Eingußteil gestaltetes Befestigungsmittel mit einer der Fasereinlage benachbarten, im wesentlichen faserfreien Zone des Gußwerkstoffes in Verbindung steht. Die Fasereinlage bewirkt in vorteilhafter Weise beim Abkühlen des Gußteiles die Ausbildung einer benachbarten Zone mit sehr feinkörniger Struktur, wobei durch die feinkörnige Struktur der Werkstoff in dieser Zone eine über den üblichen Werten liegende Festigkeit aufweist.This object is achieved with the characterizing feature of patent claim 1 in that a fastening means designed as a casting is connected to a substantially fiber-free zone of the cast material adjacent to the fiber insert. The fiber insert advantageously results in the formation of an adjacent zone with a very fine-grained structure when the cast part cools, the fine-grained structure of the material in this zone having a strength which is above the usual values.
Damit ist einerseits in vorteilhafter Weise der Werkstoff des Befestigungsmittels besser auszunützen, und andererseits wird auch das Leichtmetall-Gußteil höher belastbar. Einen besonderen Zuwachs an Festigkeit bringt die Erfindung nach einem weiteren Vorschlag bei einem aus einer Magnesium-Legierung gefertigten Gußteil.On the one hand, this advantageously makes better use of the material of the fastening means, and on the other hand, the light metal casting is also more resilient. According to a further proposal, the invention brings a particular increase in strength to a casting made from a magnesium alloy.
Nach einem weiteren Vorschlag der Erfindung ist die Fasereinlage in vorteilhafter Weise als einfacher Formkörper auszubilden, insbesondere bei einem Befestigungsmittel mit radialsymmetrischem Endbereich für die Verankerung im Gußteil.According to a further proposal of the invention, the fiber insert is advantageously designed as a simple molded body, in particular in the case of a fastening means with a radially symmetrical end region for anchoring in the casting.
Nach einem weiteren Vorschlag der Erfindung umfaßt der Formkörper Langfasern, die in einem dem Befestigungsmittel zugewandten Endbereich mit Kurzfasern kombiniert sind, wobei die Kurzfasern vorzugsweise quer zu den Langfasern angeordnet sind. Mit dieser erfindungsgemäßen Ausgestaltung wird zum einen das Leichtmetall-Gußteil über die Langfasern vorteilhaft in der Festigkeit verstärkt, wobei der Verlauf der Langfasern für eine Vergleichmäßigung der über das Befestigungsmittel eingeleiteten Belastung im Leichtmetall-Gußteil dient. Zum anderen wird mit den zu den Langfasern bevorzugt quer angeordneten Kurzfasern erreicht, daß eine große Anzahl an Kurzfaser-Enden als Kornbildner für eine feinkörnige Werkstoffstruktur in der Zone zwischen der Fasereinlage und dem Befestigungsmittel dienen. Weiter wirken die bevorzugt quer zu den Langfasern angeordneten Kurzfasern vorteilhaft gegen eine Kristall-Versetzung des Werkstoffgefüges, so daß in der Zone zwischen der Fasereinlage und dem Befestigungsmittel mit Sicherheit eine die üblichen Werte des Gießwerkstoffes übersteigende Festigkeit erreicht wird. Mit der vorbeschriebenen Ausgestaltung kann zum einen das Befestigungsmittel optimal genützt werden, wobei die über das Befestigungsmittel eingeleitete Belastung über die Langfasern im Gußteil vergleichmäßigt wird. Insgesamt ist eine hohe Werkstoffausnützung erzielt.According to a further proposal of the invention, the molded body comprises long fibers which are combined with short fibers in an end region facing the fastening means, the short fibers preferably being arranged transversely to the long fibers. With this embodiment according to the invention, on the one hand, the strength of the light metal casting is advantageously increased via the long fibers, the course of the long fibers serving to even out the load in the light metal casting which is introduced via the fastening means. On the other hand, the short fibers, which are preferably arranged transversely to the long fibers, ensure that a large number of short fiber ends serve as grain formers for a fine-grained material structure in the zone between the fiber insert and the fastening means. Furthermore, the short fibers, which are preferably arranged transversely to the long fibers, have an advantageous action against a crystal dislocation of the material structure, so that in the zone between the fiber insert and the fastening means a strength exceeding the usual values of the casting material is certainly achieved. With the configuration described above, the fastening means can are optimally used, the load introduced via the fastener is evened out over the long fibers in the casting. Overall, high material utilization is achieved.
Eine bevorzugte Ausgestaltung des vorstehend beschriebenen Formkörpers ist in weiterer Ausgestaltung mit einem schlauchartigen Formkörper aus Langfasern erzielt, der in beiden, vorzugsweise miteinander fluchtenden Befestigungsmitteln benachbarten Endbereichen mit Kurzfasern in Verbindung steht. Damit wird in vorteilhafter Weise ein erheblicher Teil des Kraftstoffflusses über die Fasern durch das Gehäuse geleitet und so örtliche Spannungsspitzen im Gußteil vermieden. Um das Handling eines solchen Formkörpers beim Vergießen zu vereinfachen, ist der Formkörper nach einem weiteren Merkmal des letztgenannten Vorschlages für die Plazierung in einer Gießform steif ausgeführt. Damit kann die erfindungsgemäße Anordnung von Befestigungsmitteln in Verbindung mit schlauchförmigen Fasereinlagen auch bei großen, komplizierten Gußteilen Verwendung finden wie beispielsweise bei einem Maschinengehäuse, inbesondere aus einer Magnesium-Legierung. Faserschläuche sind im übrigen per se aus der DE-AS 1 282 245 bekannt.A preferred embodiment of the shaped body described above is achieved in a further embodiment with a tubular shaped body made of long fibers, which is connected to short fibers in two, preferably aligned, fastening regions adjacent end regions. In this way, a considerable part of the fuel flow through the fibers is advantageously conducted through the housing and local stress peaks in the casting are avoided. In order to simplify the handling of such a shaped body during casting, the shaped body is stiff in accordance with a further feature of the last-mentioned proposal for placement in a casting mold. The arrangement of fasteners according to the invention in connection with tubular fiber inserts can thus also be used with large, complicated castings, such as, for example, in a machine housing, in particular made of a magnesium alloy. Fiber hoses are known per se from DE-AS 1 282 245.
Die Erfindung ist anhand eines bevorzugten, in der Zeichnung dargestellten Ausführungsbeispiels eines im Querschnitt gezeigten Brennkraftmaschinengehäuses mit geteiltem Hauptlager beschrieben.The invention is described with reference to a preferred exemplary embodiment of an internal combustion engine housing with a divided main bearing shown in cross section.
Ein nicht näher dargestelltes Brennkraftmaschinengehäuse 1 umfaßt ein Kurbelgehäuse 2 mit einem geteilten Hauptlager 3 für eine nicht gezeigte Kurbelwelle. Das Hauptlager 3 besteht aus einem gehäuseintegrierten Lagerteil 4 in einer Querwand 5 des Kurbelgehäuses 2 und aus einem gesonderten Hauptlagerdeckel 6. Dieser ist über Schraubbolzen 7 an der Querwand 5 befestigt, wobei die Schraubbolzen 7 in dem Lagerteil 4 benachbart angeordnete Gewindebuchsen 8 eingreifen. Die Gewindebuchsen 8 sind aus einem Eisenwerkstoff, während das Brennkraftmaschinengehäuse 1 aus einer Magnesium-Legierung ist.An internal combustion engine housing 1, not shown, comprises a
Die Gewindebuchsen 8 sind in einem schlauch- bzw. rohrförmigen Formkörper 9 aus Fasern koaxial und mit radialem Abstand angeordnet. Der als Fasereinlage in dem Brennkraftmaschinengehäuse 1 bzw. in der Querwand 5 dienende Formkörper 9 umfaßt Langfasern 10, die im Bereich der Gewindebuchse 8 mit Kurzfasern 11 kombiniert sind. Die Kurzfasern 11 sind zu den Langfasern 10 quer und zur Gewindebuchse 8 mit radialem Abstand angeordnet. Zwischen den Kurzfasern 11 und der Gewindebuchse 8 verbleibt eine aus dem Gußwerkstoff bzw. der Magnesium-Legierung bestehende, im wesentlichen faserfreie Zone 12.The threaded
Für diese Zone 12 wirken die radial einwärts gerichteten Endbereiche der Kurzfasern 11 bei der Abkühlung des Leichtmetall-Gußteiles als Kornbildner und bewirken die Ausbildung eines sehr feinkörnigen Gießwerkstoffes in dieser Zone 12. Der Gießwerkstoff in der Zone 12 erreicht durch die feinkörnige Ausbildung deutlich höhere Festigkeitswerte als in den übrigen Bereichen des Gußteiles bzw. des Brennkraftmaschinengehäuses 1. Damit ist eine höhere Belastbarkeit der Gewindebuchse 8 bzw. des Befestigungsmittels erreicht bzw. es kann durch kleinere Dimensionierung bei gleichbleibender Belastung der Werkstoff der Befestigungsmittel, wie der Gewindebuchse 8 und der Schraubbolzen 7, besser ausgenutzt werden.For this
Zur Einleitung der Belastung über den Schraubbolzen 7 und die Gewindebuchse 8 in die Querwand 5 kann der Formkörper 9 entsprechend der jeweiligen Belastung entsprechend lang ausgebildete Langfasern 10 aufweisen.To initiate the load on the
Wie aus der Zeichnung weiter hervorgeht, sind mit den Schraubbolzen 7 für den Hauptlagerdeckel 6 fluchtend angeordnete Zuganker 13 zum Anschluß eines nicht dargestellten Zylinderkopfes vorgesehen. Die fluchtende Anordnung eines Schraubbolzens 7 mit einem Zuganker 13 ermöglicht die Ausgestaltung eines schlauchartigen Formkörpers 9 mit durchgehenden Langfasern 10, wobei die Langfasern 10 im Anschlußbereich der Zuganker 13 zur Ausbildung einer hochfesten Zone 12 ebenfalls mit Kurzfasern 11 in Verbindung stehen. Die Zuganker 13 können, mit einem üblichen Gewinde versehen, entweder im Brennkraftmaschinengehäuse 1 miteingegossen werden oder aber gesondert montiert werden. In beiden Fällen ist das tragfähige Gewinde im Bereich der hochfesten, feinkörnigen Zone angeordnet.As can also be seen from the drawing,
Für die Plazierung des Formkörpers 9 in der Gießform für das Brennkraftmaschinengehäuse 1 ist der Formkörper 9 steif ausgeführt.For the placement of the molded
Claims (5)
- A light-metal casting piece, especially a die-casting piece, with a cast part (8, 13) arranged on or in a fibre insert (9) in the casting piece (1), characterised in that a fixing means (8, 13) in the form of a cast part is in connection with a predominantly fibre-free zone which adjoins the fibre insert (9).
- A casting piece according to Claim 1, characterised in that the fibre insert is a mould body (9) which surrounds, with spacing, the fixing means (8, 13) in the casting piece (1).
- A casting piece according to Claims 1 and 2, characterised in that the mould body (9) comprises long fibres (10) and, in at least one end region facing the fixing means (8, 13), short fibres (11), the short fibres (11) being arranged substantially transversely to the long fibres (10).
- A casting piece according to Claims 1 to 3 in the form of an internal combustion engine housing (1) with a fixing means (8, 13) for a cylinder head and a main bearing cover (6), characterised in that the long fibres (10) form a tubular mould body (9) and are in contact with short fibres (11) at both its end regions, the mould body having a rigid form to enable it to be placed in a casting mould.
- A casting piece according to Claims 1 to 4, characterised in that the casting material is a magnesium alloy.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3829855 | 1988-09-02 | ||
DE3829855 | 1988-09-02 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0356768A2 EP0356768A2 (en) | 1990-03-07 |
EP0356768A3 EP0356768A3 (en) | 1991-04-10 |
EP0356768B1 true EP0356768B1 (en) | 1993-04-28 |
Family
ID=6362156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890114611 Expired - Lifetime EP0356768B1 (en) | 1988-09-02 | 1989-08-08 | Light metal castings piece, especially die casting piece |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0356768B1 (en) |
DE (1) | DE58904188D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4324044C2 (en) * | 1993-07-17 | 2003-06-26 | Mahle Gmbh | Cylinder crankcase for an internal combustion engine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4104680C2 (en) * | 1991-02-15 | 2000-05-18 | Kolbenschmidt Ag | Light alloy pistons for internal combustion engines |
AT405622B (en) * | 1997-03-05 | 1999-10-25 | Tcg Unitech Ag | METHOD FOR PRODUCING HYBRID PARTS |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1282245B (en) * | 1965-05-31 | 1968-11-07 | Siemens Ag | Glass fiber reinforced metal parts |
JPS5630070A (en) * | 1979-08-17 | 1981-03-26 | Honda Motor Co Ltd | Manufacture of fiber-reinforced composite material |
DE3321212A1 (en) * | 1983-06-11 | 1984-12-13 | Kolbenschmidt AG, 7107 Neckarsulm | COMPONENT FOR A COMBUSTION ENGINE MADE FROM A LIGHT METAL MATERIAL |
GB8411074D0 (en) * | 1984-05-01 | 1984-06-06 | Ae Plc | Reinforced pistons |
DE3511555A1 (en) * | 1985-03-29 | 1986-10-09 | Kolbenschmidt AG, 7107 Neckarsulm | ALUMINUM ALLOY COMPONENTS FOR INTERNAL COMBUSTION ENGINES |
-
1989
- 1989-08-08 DE DE8989114611T patent/DE58904188D1/en not_active Expired - Fee Related
- 1989-08-08 EP EP19890114611 patent/EP0356768B1/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4324044C2 (en) * | 1993-07-17 | 2003-06-26 | Mahle Gmbh | Cylinder crankcase for an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
DE58904188D1 (en) | 1993-06-03 |
EP0356768A2 (en) | 1990-03-07 |
EP0356768A3 (en) | 1991-04-10 |
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