EP0692328B1 - Verfahren zur Herstellung von Formgussteilen aus Aluminiumlegierungen - Google Patents
Verfahren zur Herstellung von Formgussteilen aus Aluminiumlegierungen Download PDFInfo
- Publication number
- EP0692328B1 EP0692328B1 EP95810391A EP95810391A EP0692328B1 EP 0692328 B1 EP0692328 B1 EP 0692328B1 EP 95810391 A EP95810391 A EP 95810391A EP 95810391 A EP95810391 A EP 95810391A EP 0692328 B1 EP0692328 B1 EP 0692328B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blank
- cast
- pressure
- granules
- 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
Links
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
- B22D17/007—Semi-solid pressure die casting
-
- 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
- B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
Definitions
- the invention relates to a method for manufacturing of molded parts made of aluminum alloys.
- iron contents for safety castings from 0.1% Fe to 0.2% Fe, preferably 0.13% Fe to 0.18% Fe tolerable, the iron content of secondary metal, however, is clearly about that.
- primary or fresh metal in quantities added until iron, hydrogen and oxides or other metallic and non-metallic Impurities on low proportions are lowered.
- security parts is so the cycle of aluminum secondary metal not closed because of the above Purpose primary metal must be added.
- the object of the present invention is the development of a manufacturing process pore-free castings of high ductility Aluminum secondary metal with an iron content up to 1% and this object is achieved according to the invention by means of the features of claim 1 solved.
- Advantageous refinements of the method according to claim 1 characterize the Objects of the following claim 1 Expectations.
- the method according to the invention is essentially divided in two by in a first process step Recycle aluminum scrap and to a blank e.g. to shed a strand is (first solidification), from which in one second step of the molded body becomes.
- first solidification e.g. to shed a strand
- second solidification e.g. to shed a strand
- Aluminum scrap which can be composed of cast or wrought alloys or mixtures thereof, is used as the starting material. With a wide solidification interval, the iron content of the scrap can be up to 1.0%. Aluminum scrap with iron contents of this order of magnitude and other impurities are produced, for example, from automobile shredder systems.
- the following conditions must be met or fulfilled for the purpose according to the invention, ie a casting structure which is insensitive to impurities.
- a solidification process is to be used which precludes or largely suppresses crystal growth from a cooled or heat-conducting wall.
- This type of solidification process can be achieved by rapid movement of the melt in front of the solidification front, the movement being able to take place by mechanical or electromagnetic stirring.
- the overwhelming majority (approx. 90%) of the final crystals must have grown free-floating in the melt.
- a low casting temperature (maximum 20 ° C above the liquidus temperature) is preferred. If strands are cast as blanks, which are separated to produce a cast part, strands with cross sections of up to 200 cm 2 have proven to be advantageous.
- each blank of a special heat treatment to undergo the contours of the Mixed crystals (cast grains) on melted Round grain boundaries and their size (Diameter) by at least 20% and at most 70% grow and they are thereby from the residual melt encased overall, this as the decisive one Prerequisite for tixotropy.
- This Heat treatment is preferred immediately before the final shape by a blank to a temperature between Solidus and liquidus temperature, preferably near the solidus temperature e.g. inductively heated and a pressure with the heating temperature is subjected to pressurization for final shaping in a die casting machine can be done.
- the pressing takes place by high pressure casting, i.e.
- a temperature gradient on the blank set or applied the a thin, not melted surface layer a maximum of a few mm (0.05 mm to 3.0 mm, preferably 0.5 mm to 1.5 mm) at temperatures below or at the solidus temperature leaving the blank covering all around and the thus cooler than the rest of the blank.
- a cross section of heating rising inside out also tapered heating
- Suitable measures such as cooling the surface of the blank in the final phase of inductive Heating by a gas stream or by use of cooling surfaces.
- the method according to the invention also allows an acceleration of manufacturing processes for Cast aluminum safety parts by conventional Die casting machines (cold chamber machines) become applicable. It is known that conventional aluminum die-cast iron content in metal e.g. by 0.4% prevent the mold from being removed. Iron contents of this order of magnitude (approx. 0.4%) however, closed the use of such cast Molded parts as safety parts, for example in the automobile. With the demand for a lot low iron contents were forced to Safety parts using low pressure casting machines (where the problem alloying at low, i.e. less than 0.4% iron content does not occur), however, their output is significantly lower than that of die casting machines, i.e. the Cold chamber high pressure casting machines.
- EP-A-0.554.808 A1 describes a process for the production of molded parts made of an aluminum alloy with a Iron content from 0.3% to 0.5% known as primary material, at which is the aluminum alloy in the molten state brought in with a higher than usual amount Grain refining agent added, poured into a blank, the blank to any temperature below the Solidus temperature cooled, then with formation of a tixotropic slip to a temperature between Solidus and liquidus temperature heated up at this Temperature held for a certain time and is then fed to a molding system.
- This The process is the production of rheo pre-material to simplify fine-grained, homogeneous structure and to make it more economical.
- EP-A-0.513.523 A1 discloses a method of manufacture of molded parts from a dispersion-hardened Aluminum alloy, in which the aluminum alloy dendritic crystal structure to form a globular blank Potted crystal structure, the blank before transformation to Cast part of a heat treatment at temperatures close the solidification area of the aluminum alloy, for the purpose the transformation of the globular crystal structure of the Metal alloy in a doughy form, subjected, and then liquefied using pressure and is cast to form a molded part.
- the known methods are not suitable Aluminum alloys with high iron contents for Manufacture of non-porous castings with high ductility to use.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Continuous Casting (AREA)
- Forging (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Description
Claims (8)
- Verfahren zur Herstellung von Formgussteilen aus 0,15% bis 1,0% Eisen als metallische und andere nichtmetallische Bestandteile enthaltenden Aluminiumlegierungen als Ausgangsmaterial, wobei das Ausgangsmaterial zu einem Rohling mit feinkörnigem Gefüge, dessen Körner zu mindestens 90% freischwebend in einer Schmelze zum Wachstum gebracht und von einer Restschmelze mit einer Filmstärke von mindestens einem Micron umhüllt sind, vergossen, der Rohling vor Umbildung zum Formgussteil einer Wärmebehandlung zwischen Solidus- und Liquidustemperatur, vorzugsweise einer Temperatur nahe der Solidustemperatur zum Wachstum und zur Rundung seiner Körner unterworfen, anschliessend der angewärmte Rohling unter Anwendung von Druck verflüssigt und unter Bildung eines Formgussteiles vergossen wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, das das Gussgefüge des Rohlings mit Korngrössen von 0,02 mm bis 0,3 mm, vorzugsweise von 0,03 mm bis 0,15 mm ausgebildet wird.
- Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Grösse der Körner des Rohlings durch Wärmebehandlung um mindestens 20% und höchstens 70% wachsen und dabei von Restschmelze überwiegend umhüllt werden.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Erwärmung des Rohlings induktiv erfolgt.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Erwärmung des Rohlings von aussen nach innen mit steigenden Temperaturen erfolgt.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass durch Anwendung von Druck das tixotrope Fliessen des Metalles des Rohlings bewirkt wird.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass durch Anwärmen 25% bis 50% der Metallmenge des Rohlings in flüssigen Zustand, Rest fest, gebracht wird.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Anwendung von Druck in der Füllkammer einer Hochdruck-Kaltkammergiessmaschine vermittels eines Füllkolbens erfolgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4420533A DE4420533A1 (de) | 1994-06-14 | 1994-06-14 | Verfahren zur Herstellung von Formgußteilen aus Aluminiumlegierungen |
DE4420533 | 1994-06-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0692328A1 EP0692328A1 (de) | 1996-01-17 |
EP0692328B1 true EP0692328B1 (de) | 2000-03-08 |
Family
ID=6520418
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95810391A Expired - Lifetime EP0692328B1 (de) | 1994-06-14 | 1995-06-13 | Verfahren zur Herstellung von Formgussteilen aus Aluminiumlegierungen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0692328B1 (de) |
AT (1) | ATE190251T1 (de) |
DE (2) | DE4420533A1 (de) |
ES (1) | ES2147598T3 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10311875A1 (de) * | 2003-03-17 | 2004-11-18 | Wf-Maschinenbau Und Blechformtechnik Gmbh & Co Kg | Zylinderförmiges Formteil |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA957180A (en) * | 1971-06-16 | 1974-11-05 | Massachusetts, Institute Of Technology | Alloy compositions containing non-dendritic solids and process for preparing and casting same |
LU69788A1 (de) * | 1974-04-04 | 1976-03-17 | Pechiney Aluminium | |
NL7905471A (nl) * | 1978-07-25 | 1980-01-29 | Itt | Werkwijze voor het vormen van een gevormd product uit een metaallegering. |
CH654027A5 (de) * | 1983-08-23 | 1986-01-31 | Alusuisse | Verfahren zur herstellung feinkoerniger aluminiumwalzprodukte. |
IT1245080B (it) * | 1991-04-19 | 1994-09-13 | Weber Srl | Procedimento per l'ottenimento di pressocolati ad alte prestazioni meccaniche mediante iniezione di una lega metallica allo stato semiliquido. |
CH683267A5 (de) * | 1991-06-10 | 1994-02-15 | Alusuisse Lonza Services Ag | Verfahren zum Aufheizen eines Werkstückes aus einer Metallegierung. |
EP0554808B1 (de) * | 1992-01-30 | 1997-05-02 | EFU GESELLSCHAFT FÜR UR-/UMFORMTECHNIK mbH | Verfahren zur Herstellung von Formteilen aus Metallegierungen |
-
1994
- 1994-06-14 DE DE4420533A patent/DE4420533A1/de not_active Withdrawn
-
1995
- 1995-06-13 EP EP95810391A patent/EP0692328B1/de not_active Expired - Lifetime
- 1995-06-13 ES ES95810391T patent/ES2147598T3/es not_active Expired - Lifetime
- 1995-06-13 AT AT95810391T patent/ATE190251T1/de not_active IP Right Cessation
- 1995-06-13 DE DE59507938T patent/DE59507938D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE4420533A1 (de) | 1995-12-21 |
ES2147598T3 (es) | 2000-09-16 |
EP0692328A1 (de) | 1996-01-17 |
ATE190251T1 (de) | 2000-03-15 |
DE59507938D1 (de) | 2000-04-13 |
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