US4653569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing fiber-reinforced light-metal castings
Assignee: Daimler Benz AG
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Filing: 1986-02-07
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Granted: 1987-03-31
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Expires: 2006-02-07
Abstract
Abstract A process is described for producing fiber-reinforced light-metal castings in which a loose fiber tangle is placed in a casting mold and is saturated with molten light-metal under low pressure. Subsequently, the excess of molten light-metal is squeezed off while the fiber tangle is compressed. The outflow of the molten light-metal is then stopped with the molten light-metal being solidified under high pressure. The process is especially suitable for utilizing the solution-spun inorganic fiber tangles that up to now had not been especially suitable for the reinforcing of light-metals.
Inventors
- 👤 Eggert Tank
- 👤 Dieter Hedrich
- 👤 Peter Straub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:26
CPC Classifications
C; C22; C22C; C22C47/00; C22C47/08; B; B22; B22D; B22D19/00; B22D19/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
99 words
A process for producing fiber-reinforced light-metal castings in which a fiber material is saturated with a molten light-metal under low pressure and the molten light-metal is subsequently solidified under high pressure, said process including: (a) placing a fiber tangle of solution-spun, fired, inorganic loose fibers in a mold; (b) saturating the fiber tangle with an excess of molten light-metal; (c) removing the excess of molten light-metal while compressing the fiber tangle at the same time under low pressure; (d) stopping the outflow of the molten light-metal from the mold; and (e) solidifying the fiber-interspersed molten light-metal under high pressure.
Claim 2
Dependent Claim
99 words
A process for producing fiber-reinforced light-metal castings in which a fiber material is saturated with a molten light-metal under low pressure and the molten light-metal is subsequently solidified under high pressure, said process including: (a) placing a fiber tangle of solution-spun, fired, inorganic loose fibers in a mold; (b) saturating the fiber tangle with an excess of molten light-metal; (c) removing the excess of molten light-metal while compressing the fiber tangle at the same time under low pressure; (d) stopping the outflow of the molten light-metal from the mold; and (e) solidifying the fiber-interspersed molten light-metal under high pressure.
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein the molten light-metal is solidified in a directed manner by a targeted cooling.
Claim 4
Dependent Claim
14 words
A process according to claim 1, wherein the molten light-metal is made from magnesium.
Claim 5
Dependent Claim
24 words
A process according to claim 3, wherein the fiber tangle is made from a selected group including aluminum-oxide, mullite, aluminum borosiliate and mixtures thereof.
Claim 6
Dependent Claim
30 words
A process according to claim 4, wherein the fibers of the fiber tangle are made to have a plurality of diameters having a range of 2 μm to 5 μm.
Claim 7
Dependent Claim
20 words
A process according to claim 5, wherein the fibers of the fiber tangle are a length of a few centimeters.
Claim 8
Dependent Claim
29 words
A process according to claim 1, wherein removing the excess molten light-metal while compressing the fiber tangle occurs rapidly to prevent solidification of the molten light-metal during this stage.
Claim 9
Dependent Claim
29 words
A process according to claim 6, wherein the stopping of the out flow of molten light-metal is done after the desired degree of density of fiber tangle is attained.
Claim 10
Dependent Claim
21 words
A process according to claim 1, wherein saturating the fiber tangle takes place relatively slowly at a pressure below one bar.
Claim 11
Dependent Claim
30 words
A process according to claim 1, wherein solidifying the fiber-interspersed molten light-metal occurs in a delayed manner at the lateral walls of the mold by means of heating said walls.
Claim 12
Dependent Claim
29 words
A process according to claim 1, wherein during the saturating of the fiber tangle a mass of said light-metal is much larger than a mass of said fiber tangle.
Claim 13
Dependent Claim
23 words
A process according to claim 1, wherein the high pressure during the solidifying of said fiber-interspersed molten light-metal is greater than 1000 bars.
Claim 14
Dependent Claim
23 words
A process according to claim 1, wherein the high pressure during the solidifying of said fiber-interspersed molten light-metal is up to 2000 bars.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |