EP0969111B1 - Metallbolzen mit thixotropen Eigenschaften und Verfahren zu seiner Herstellung - Google Patents
Metallbolzen mit thixotropen Eigenschaften und Verfahren zu seiner Herstellung Download PDFInfo
- Publication number
- EP0969111B1 EP0969111B1 EP98810591A EP98810591A EP0969111B1 EP 0969111 B1 EP0969111 B1 EP 0969111B1 EP 98810591 A EP98810591 A EP 98810591A EP 98810591 A EP98810591 A EP 98810591A EP 0969111 B1 EP0969111 B1 EP 0969111B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cross
- bolt
- metal
- thixotropic
- bolts
- 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
- 230000009974 thixotropic effect Effects 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 239000011324 bead Substances 0.000 claims 2
- 238000000465 moulding Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 19
- 238000005266 casting Methods 0.000 abstract 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 11
- 229910001092 metal group alloy Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012821 model calculation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase
Definitions
- the invention relates to a metal bolt according to the preamble of claim 1. Within the scope of the invention also a process for the production of metal bolts and their use.
- Bolts with thixotropic properties are known by vertical or horizontal continuous casting of a metal alloy.
- the molten metal in the solidification area is stirred vigorously, whereby above all have proven electromagnetic stirring devices.
- the dendrites that form are sheared off or developed back so that these primarily solidifying solid particles are essentially globulitic Take shape.
- Bolts made of continuous cast material, for further processing are provided in the thixotropic state, according to the state of the Technique a circular cross section.
- a temperature gradient between the stud surface and the stud core, which is more pronounced the higher the heating rate is chosen.
- the liquid metal portion over the bolt cross section at the processing temperature within specified tolerance values lies, for example, between 30 and 50%.
- Energy input in the bolt in the area of the solid / liquid transition between Solidus and liquidus temperature of the metal alloy so slow that at the The maximum permissible temperature is not exceeded and the temperature in the bolt core is not significantly lower, so that the liquid metal portion over the bolt cross section in the specified tolerance range lies.
- the invention is therefore based on the object, metal bolt of the beginning mentioned type so that in comparison to conventional round bolts faster heating up for further processing in the required temperature is possible in the thixotropic state.
- a metal bolt with the features of claim 1 leads to the achievement of the object according to the invention.
- the one when heating up of the bolt to the thixotropic state between the lowest temperature in the core and the highest temperature on the surface of the bolt temperature difference is compared to a bolt with a circular Cross-section with the same cross-sectional area under the same heating conditions kept smaller or reached after a shorter heating-up time.
- the essential essence of the invention is that if there is a deviation from the circular cross-sectional shape with the same cross-sectional area the bolt surface enlarged and at the same time the distance between the pin surface and core is downsized.
- Both measures mean that the Heating up a bolt designed according to the invention in comparison to a round bolt according to the prior art with the same cross-sectional area under the same heating conditions, smaller temperature differences between the bolt surface and the bolt core.
- each bolt has a different shape from the circular one Cross section the above-mentioned advantage over round bolts on.
- the bolt shape can be made by special cross-sectional shapes for example, better adapted to molded parts to be produced by thixoforming become.
- the shapes for the bolt cross section are dumbbell, cross, star, H or double cross shape.
- the metal bolts according to the invention all are in the state of the Technique for the production of metal bolts with thixotropic properties for the Suitable for further processing in the thixotropic state, in which a strand with a thixotropic structure is made from a molten metal cast, the cast strand cut to bolts and the bolts for adjustment of the thixotropic state are heated before further processing.
- the molten metal becomes a strand with one described above, cross section deviating from the circular shape.
- the bolts according to the invention and their manufacture are not limited to a specific one Limited material.
- preferred materials are aluminum, Magnesium, copper, steel and their alloys, whereby in particular for light metals and very particularly preferably for aluminum and magnesium alloys, which, for example, can also be fiber or particle reinforced can achieve excellent results.
- the bolts are preferred on a horizontal continuous casting machine with a electromagnetic stirring device arranged in the area of the mold carried out.
- a electromagnetic stirring device arranged in the area of the mold carried out.
- the bolts are heated for further processing in the thixotropic state usually inductive. In principle, however, other heating methods can also be used or devices are used with which bolts quickly and can be heated evenly.
- a particularly preferred area of application for the inventive Metal stud is the production of molded parts by thixoforming.
- Thixoforming is converted into the thixotropic state by heating Metal bolts placed in a filling chamber and by pressurization introduced or shot into a mold cavity by means of a piston, in which the thixotropic metal alloy solidifies as a molded part.
- Another preferred area of application is the production of a profile through thixoextrusion. In this process one becomes a thixotropic state heated bolt pressed into a profile strand by a cooled mold.
- FIG. 1 shows that the liquid metal portion of the alloy rises from about 10 to 50% in the range of the binary eutectic within a narrow temperature range of about 2 ° C.
- the diagram clearly shows that the temperature gradient across the cross-section of a metal bolt in the thixotropic state must be kept small in order to produce a liquid metal component that is within narrow tolerance limits.
- the diagrams shown in FIGS. 2 and 3 were determined on round bolts with a diameter of 60 mm from the above-mentioned alloy. The bolts were heated inductively in two stages.
- T O is the temperature at the stud surface
- T K is the temperature in the stud core
- fl O is the liquid metal portion on the stud surface
- fl K is the liquid metal portion in the stud core
- t 2 is the heating time of the second stage.
- FIGS. 4 to 9 show examples of possible cross-sectional shapes of metal bolts. Depending on the application, there may be a specific cross-sectional shape turn out to be cheap. Essentially oval, dumbbell, cross or star-shaped and H or double cross-shaped bolt cross sections according to FIGS. 4 to 9 are suitable, for example, for the simultaneous production of several parts from a bolt or for large parts. Especially in combination with one or more slit-shaped gate cross sections Expand the range of parts that can be manufactured using thixoforms. Slotted Gate cross sections increase the shear rate and subsequently lead to one lower pressing force and better mold filling capacity, which the Production of complex shaped parts allowed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
- Heat Treatment Of Articles (AREA)
Description
- - Fig. 1
- den Flüssigmetallanteil einer Aluminiumlegierung als Funktion der Temperatur;
- - Fig. 2
- einen Temperatur-Zeitverlauf beim Aufheizen eines Metallbolzens aus einer Aluminiumlegierung zum thixotropen Zustand;
- - Fig. 3
- das Temperaturgefälle über dem Querschnitt eines Metallbolzens aus einer Aluminiumlegierung im thixotropen Zustand;
- - Fig. 4 - 9
- verschiedene Querschnittsformen von Metallbolzen.
| t2 [s] | TK [°C] | flK [%] | TO [°C] | flO [%] |
| 200 | 569.2 | 26.1 | 571.5 | 52.0 |
| 250 | 569.5 | 31.7 | 572.3 | 53.0 |
| 300 | 569.8 | 40.3 | 574.1 | 53.9 |
| 350 | 570.1 | 51.2 | 575.8 | 55.1 |
Claims (4)
- Metallbolzen mit thixotropen Eigenschaften für die Weiterverarbeitung im thixotropen Zustand, wobei der Bolzen einen von der kreisrunden Form abweichenden Querschnitt aufweist,
dadurch gekennzeichnet, dass
der Bolzenquerschnitt hantel-, kreuz-, stern-, H- oder doppelkreuzförmig ist. - Verfahren zur Herstellung von Metallbolzen mit thixotropen Eigenschaften für die Weiterverarbeitung im thixotropen Zustand, wobei aus einer Metallschmelze ein Strang mit einem thixotropen Gefüge und mit einem von der kreisrunden Form abweichenden Querschnitt gegossen, der gegossene Strang zu Bolzen abgelängt und die Bolzen zur Einstellung des thixotropen Zustandes vor der Weiterverarbeitung aufgeheizt werden,
dadurch gekennzeichnet, dass
der Bolzenquerschnitt hantel-, kreuz-, stem-, H- oder doppelkreuzförmig ist. - Verwendung eines Metallbolzens nach Anspruch 1 oder Anwendung des Verfahrens nach Anspruch 2 zur Herstellung eines Formteils durch Thixoformen.
- Verwendung eines Metallbolzens nach Anspruch 1 oder Anwendung des Verfahrens nach Anspruch 2 zur Herstellung eines Profils durch Thixoextrusion.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT98810591T ATE216734T1 (de) | 1998-06-26 | 1998-06-26 | Metallbolzen mit thixotropen eigenschaften und verfahren zu seiner herstellung |
| DE59803922T DE59803922D1 (de) | 1998-06-26 | 1998-06-26 | Metallbolzen mit thixotropen Eigenschaften und Verfahren zu seiner Herstellung |
| EP98810591A EP0969111B1 (de) | 1998-06-26 | 1998-06-26 | Metallbolzen mit thixotropen Eigenschaften und Verfahren zu seiner Herstellung |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP98810591A EP0969111B1 (de) | 1998-06-26 | 1998-06-26 | Metallbolzen mit thixotropen Eigenschaften und Verfahren zu seiner Herstellung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0969111A1 EP0969111A1 (de) | 2000-01-05 |
| EP0969111B1 true EP0969111B1 (de) | 2002-04-24 |
Family
ID=8236160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98810591A Expired - Lifetime EP0969111B1 (de) | 1998-06-26 | 1998-06-26 | Metallbolzen mit thixotropen Eigenschaften und Verfahren zu seiner Herstellung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0969111B1 (de) |
| AT (1) | ATE216734T1 (de) |
| DE (1) | DE59803922D1 (de) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4434837A (en) * | 1979-02-26 | 1984-03-06 | International Telephone And Telegraph Corporation | Process and apparatus for making thixotropic metal slurries |
| EP0483943A2 (de) * | 1990-10-29 | 1992-05-06 | Rheo-Technology, Ltd | Verfahren und Vorrichtung zur Herstellung thixotroper Metalllegierungen |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPO110296A0 (en) * | 1996-07-18 | 1996-08-08 | University Of Melbourne, The | Liquidus casting of alloys |
-
1998
- 1998-06-26 DE DE59803922T patent/DE59803922D1/de not_active Expired - Fee Related
- 1998-06-26 AT AT98810591T patent/ATE216734T1/de not_active IP Right Cessation
- 1998-06-26 EP EP98810591A patent/EP0969111B1/de not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4434837A (en) * | 1979-02-26 | 1984-03-06 | International Telephone And Telegraph Corporation | Process and apparatus for making thixotropic metal slurries |
| EP0483943A2 (de) * | 1990-10-29 | 1992-05-06 | Rheo-Technology, Ltd | Verfahren und Vorrichtung zur Herstellung thixotroper Metalllegierungen |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE216734T1 (de) | 2002-05-15 |
| EP0969111A1 (de) | 2000-01-05 |
| DE59803922D1 (de) | 2002-05-29 |
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