DE10244338A1 - Production of hollow cast parts used as integral cast parts comprises impinging cast parts with an inner high pressure deforming tool having an inner high pressure - Google Patents

Production of hollow cast parts used as integral cast parts comprises impinging cast parts with an inner high pressure deforming tool having an inner high pressure Download PDF

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Publication number
DE10244338A1
DE10244338A1 DE2002144338 DE10244338A DE10244338A1 DE 10244338 A1 DE10244338 A1 DE 10244338A1 DE 2002144338 DE2002144338 DE 2002144338 DE 10244338 A DE10244338 A DE 10244338A DE 10244338 A1 DE10244338 A1 DE 10244338A1
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Germany
Prior art keywords
high pressure
cast parts
inner high
casting
production
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Application number
DE2002144338
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German (de)
Inventor
Bernd Günther
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Priority to DE2002144338 priority Critical patent/DE10244338A1/en
Publication of DE10244338A1 publication Critical patent/DE10244338A1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • C21D7/12—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars by expanding tubular bodies
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2241/00—Treatments in a special environment
    • C21D2241/01—Treatments in a special environment under pressure
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation

Abstract

Production of hollow cast parts comprises impinging cast parts with an inner high pressure deforming tool having an inner high pressure.

Description

Die vorliegende Erfindung betrifft ein Bearbeitungsverfahren für hohle Gussteile gemäß dem Oberbegriff des Patentanspruches 1.The present invention relates to a machining process for hollow castings according to the generic term of claim 1.

Gussteile aus Aluminium oder Magnesium, insbesondere große Integralteile, neigen nach dem Gießen zu Verzug und Maßungenauigkeiten. Sie müssen daher "gerichtet" werden, was mit hohem Aufwand verbunden ist. Ein weiteres Problem bei Gussteilen besteht darin, dass sich Wandstärken, die kleiner als 4 mm sind, und partiell größere Wanddickenunterschiede nur schwierig herstellen lassen. Häufig liegen nach dem Gießen Gussinhomogenitäten, d.h. Lunker bzw. Porositäten vor. Insbesondere große Integralteile können nur schwierig, mit hohem Ausschuss und aufwendiger Nacharbeit hergestellt werden. Innere Bauteilfehler, wie Lunker oder Porositäten können zwar durch geeignete Prüfverfahren, wie z.B. Röntgenprüfung, erkannt werden. Dies ist jedoch aufwändig und teuer.Castings made of aluminum or magnesium, in particular size Integral parts tend to warp and inaccurate dimensions after casting. You need to therefore be "judged" what with high effort is connected. Another problem with castings is that wall thicknesses, which are smaller than 4 mm, and partially larger wall thickness differences difficult to make. Often there are casting inhomogeneities after casting, i.e. Blowholes or porosities in front. Especially big ones Integral parts can difficult to produce with high rejects and time-consuming rework. Internal component defects, such as cavities or porosities, can be checked by suitable test methods such as e.g. X-ray inspection, recognized become. However, this is complex and expensive.

Aufgabe der Erfindung ist es, ein Bearbeitungsverfahren für Gussteile zu schaffen, mit dem die o.g. Probleme bewältigbar sind.The object of the invention is a Machining process for To create castings with which the above Problems manageable are.

Diese Aufgabe wird durch die Merkmale des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen.This task is due to the characteristics of claim 1 solved. Advantageous refinements and developments of the invention are the subclaims refer to.

Das Grundprinzip der Erfindung besteht darin, hohle Gussteile nach dem Gießen und der Rohgussbearbeitung einem Innenhochdruckverfahren zu unterziehen. Die Gussteile werden hierzu in ein Innenhochdruckumformwerkzeug eingebracht und mit Innenhochdruck beaufschlagt. Dies führt zu einer "Kalibrierung". D.h., ein nach dem Gießen entstandener Verzug kann "gerichtet" werden. Je nach Druck des zur Beaufschlagung verwendeten Mediums ist es auch möglich, die Wandstärke des Gussteils in Teilbereichen zu reduzieren oder die Wandstärke des gesamten Gussteils zu reduzieren.The basic principle of the invention is in hollow castings after casting and raw casting processing to undergo a high pressure process. The castings will be for this purpose introduced into an internal high pressure forming tool and with internal high pressure applied. this leads to to a "calibration". That is, one after pouring The resulting delay can be "addressed". Depending on Printing of the medium used for the application is also possible Wall thickness to reduce the casting in parts or the wall thickness of the whole To reduce casting.

Innenhochdruckverfahren sind zwar bereits seit langem bekannt. Jedoch wurde bislang das Prinzip der Innenhochdruckumformung ausschließlich bei Bauteilen aus "Knetwerkstoffen" eingesetzt, nicht jedoch bei Gussteilen. Das Verfahren gemäß der Erfindung ist insbesondere zur Bearbeitung von Aluminium- oder Magnesiumgussteilen geeignet. Es kann jedoch auch bei Gussteilen aus anderen Materialien bzw. Legierungen eingesetzt werden.Indoor high pressure processes are already known for a long time. However, the principle of Internal high pressure forming is only used for components made of "kneading materials", but not for castings. The method according to the invention is particular suitable for processing aluminum or magnesium castings. However, castings made from other materials or Alloys are used.

Sofern am Gussteil nur eine geringe Umformung vorgenommen werden muss, d.h. wenn beispielsweise ein entstandener Verzug korrigiert werden muss, kann dies bei Raumtemperatur durch Innenhochdruckbeaufschlagung durchgeführt werden. Vorzugsweise wird jedoch insbesondere bei größeren Kalibrier- bzw. Umformgraden eine höhere Temperatur gewählt, die beispielsweise im Bereich zwischen 150°C–500°C liegt. Man spricht dann von Warminnenhochdruckumformung. Bei Aluminiumgusslegierungen kann diese höhere Temperatur zugleich für eine Warmaushärtung genutzt werden.If only a small amount on the casting Forming must be carried out, i.e. if for example a resulting distortion must be corrected, this can be done at room temperature be carried out by applying high pressure. Preferably however, especially with larger calibration or degrees of deformation a higher Temperature selected, which is, for example, in the range between 150 ° C-500 ° C. One then speaks of Warm hydroforming. This can occur with cast aluminum alloys higher Temperature at the same time for a heat curing be used.

Zusammenfassend lassen sich mit der Erfindung folgende Vorteile erreichen:In summary, with the Invention achieve the following advantages:

  • – Herstellung von hohlen Integralgussteilen mit hoher Maßgenauigkeit- manufacture of hollow integral castings with high dimensional accuracy
  • – Kein Richtaufwand- None set up time
  • - Herstellung von Bauteilen mit Wanddicken kleiner als 4 mm ist möglich- Production of components with wall thicknesses less than 4 mm is possible
  • – Die Endkontur entsteht nach dem Gießen durch Kalt- oder Warminnenhochdruckumformung. Dies ermöglicht die Herstellung von Konturen, die allein durch Gießen nicht erreichbar sind.- The Final contour is created after casting through cold or hot internal high pressure forming. This enables the Production of contours that cannot be achieved by casting alone.
  • – Innere Gussfehler können durch Verschweißen bzw. Verdichten korrigiert werden- Inside Casting defects can by welding or Compacting can be corrected
  • - Eine Prüfung auf innere Fehler kann entfallen.- An exam internal errors can be accounted for.

Claims (7)

Bearbeitungsverfahren für hohle Gussteile, dadurch gekennzeichnet, dass das Gussteil mittels eines Innenhochdruckumformwerkzeugs mit Innenhochdruck beaufschlagt wird.Processing method for hollow cast parts, characterized in that the cast part is subjected to internal high pressure by means of an internal high pressure forming tool. Bearbeitungsverfahren nach Anspruch 1, wobei der Innenhochdruck so gewählt wird, dass die Wandstärke des Gussteils zumindest in Teilbereichen verringert wird.Machining method according to claim 1, wherein the Internal high pressure selected in this way is that the wall thickness of the casting is reduced at least in some areas. Bearbeitungsverfahren nach einem der Ansprüche 1 oder 2, wobei die Innenkontur des Innenhochdruckumformwerkzeugs derart ist, dass die Außenkontur des Gussteils bei der Innenhochdruckumformung unverformt bleibt.Processing method according to one of claims 1 or 2, the inner contour of the hydroforming tool in such a way is that the outer contour of the casting remains undeformed during hydroforming. Bearbeitungsverfahren nach einem der Ansprüche 1 bis 3, wobei die Bearbeitungstemperatur bei der Innenhochdruckumformung zwischen 150°C und 500°C liegt.Processing method according to one of claims 1 to 3, the processing temperature in hydroforming between 150 ° C and 500 ° C. Bearbeitungsverfahren nach einem der Ansprüche 1 oder 2 oder 4, wobei bei der Innenhochdruckumformung die Außenkontur des Gussteils umgeformt wird.Processing method according to one of claims 1 or 2 or 4, the outer contour being used for internal high pressure forming of the casting is formed. Bearbeitungsverfahren nach einem der Ansprüche 1 bis 5, wobei das Gussteil ein Aluminiumgussteil ist.Processing method according to one of claims 1 to 5, wherein the casting is an aluminum casting. Bearbeitungsverfahren nach einem der Ansprüche 1 bis 5, wobei das Gussteil ein Magnesiumgussteil ist.Processing method according to one of claims 1 to 5, the casting being a magnesium casting.
DE2002144338 2002-09-24 2002-09-24 Production of hollow cast parts used as integral cast parts comprises impinging cast parts with an inner high pressure deforming tool having an inner high pressure Withdrawn DE10244338A1 (en)

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Application Number Priority Date Filing Date Title
DE2002144338 DE10244338A1 (en) 2002-09-24 2002-09-24 Production of hollow cast parts used as integral cast parts comprises impinging cast parts with an inner high pressure deforming tool having an inner high pressure

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DE2002144338 DE10244338A1 (en) 2002-09-24 2002-09-24 Production of hollow cast parts used as integral cast parts comprises impinging cast parts with an inner high pressure deforming tool having an inner high pressure

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DE10244338A1 true DE10244338A1 (en) 2004-04-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005023732B3 (en) * 2005-05-23 2006-07-20 Daimlerchrysler Ag Production of hollow metal moldings comprises producing hollow casting and internal pressure molding of this, moldable section being thinner than adjacent sections which are thicker than sections on opposite side from moldable section
EP2050519A1 (en) * 2007-10-12 2009-04-22 Rolls-Royce plc Shape Correcting Components

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571969A (en) * 1981-07-30 1986-02-25 National Distillers And Chemical Corporation Autofrettage process
DE19650736C1 (en) * 1996-12-06 1998-09-24 Schmidt & Co Gmbh Kranz Forming process for thick-walled cylinder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571969A (en) * 1981-07-30 1986-02-25 National Distillers And Chemical Corporation Autofrettage process
DE19650736C1 (en) * 1996-12-06 1998-09-24 Schmidt & Co Gmbh Kranz Forming process for thick-walled cylinder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005023732B3 (en) * 2005-05-23 2006-07-20 Daimlerchrysler Ag Production of hollow metal moldings comprises producing hollow casting and internal pressure molding of this, moldable section being thinner than adjacent sections which are thicker than sections on opposite side from moldable section
EP2050519A1 (en) * 2007-10-12 2009-04-22 Rolls-Royce plc Shape Correcting Components
US8205476B2 (en) 2007-10-12 2012-06-26 Rolls-Royce Plc Shape correcting components

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8141 Disposal/no request for examination