Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1996-05-17
2000-12-05
Batten, Jr., J. Reed
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164 41, 164 15, B22C 122, B22C 902
Patent
active
06155331&
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the rapid production of dead molds and cores for the casting practice without using master molding tools.
There are conventional methods for the rapid production of three-dimensional, geometrically complex and exact objects even when provided with undercuts, and those methods operate without master molding tools, i.e. without the bodily existing outer and inter shape of the object as positive or negative mold and without machining and cutting operations and generating the desired objects directly from the three-dimensional representation of the geometry existing in the computer, whereby solid, powderous materials or liquid materials are used as base material. Those methods are known as generative manufacturing methods, rapid prototyping RP, solid freeform manufacturing SFM or fast free form fabrication FFFF (Technische Rundschau 83 (1991) 20, pp. 36-43 and 44, pp. 58-61, Materials World, December 1993, pp. 656-658, (modern casting October 1993, pp. 25-27). The best known method of this kind is called stereo lithography (Konstruieren+Gie.beta.en 17 (1992) 4, pp. 13-19, Technische Rundschau 82 (1991) 11, pp. 40/41, Automobil-Produktion August 1992, pp. 102/104, Laser-Praxis May 1992, pp. LS58/LS59).
These methods allow to produce prototypes, sample parts etc. of various resins, coated paper as well as wax. Various materials are suitable for use with objects produced therefrom as lost molds in fine casting processes so that consequently cast parts can be produced by fine casting without using a master molding tool. It is further known that metallic or ceramic objects can be directly produced without master molding tools by the selective laser sintering SLS method (Int. J. of Powder Metallurgy 28 (1992) 4, pp. 369-381, Metallurgical Transactions A 24/1993, pp. 757-759).
A method known as selective laser sintering is disclosed in DE 43 00 478 C1. Using this method three-dimensional objects can be produced by successive solidification of individual layers of the object to be formed of powdery solidifiable material under the influence of laser radiation on each layer at the places corresponding to the object. It is known to produce three-dimensional objects by laser sintering of metal or ceramic powder.
The powders used in the selective laser sintering method are of ceramic type consisting of two components A and B and the bonding between the particles is made by ceramic bonding, i.e. a chemical reaction between the components of the powder.
It is known to use alumina in connection with ammonia dihydrogen phosphate or fluorophosphateglass powder as bonding substance, whereby the used one of the latter two substances is molten into a glass phase by laser irradiation, the granulated alumina is infiltrated and the bonding having a defined green strength is obtained by congelation. Thereafter the obtained body is exposed to a temperature of above 800 degrees Celsius for several hours outside of the selective laser sintering plant, whereby both components finally react to produce a ceramic bonding having high density, strength, hardness and melting temperature (baking or firing process). The two components can be mixed (FIG. 1) or one component is coated by the other component (FIG. 2); in any case a ceramically bonded body is obtained after the baking process. It is a typical characteristic of all so far known embodiments of this process that the component A which does not melt initially in the selective laser sintering device is incorporated into the chemical reaction occurring in the baking process which results in the ceramic body C. A further typical characteristic are the high temperatures and long baking periods necessary and the proposed use of the generated ceramic body as a molding shell or core for the fine casting process. Also when using other materials a uniform ceramic part is produced.
(3rd Int. Conf. on Rapid Prototyping at the University of Dayton, Conf. Proceedings, Dayton, Ohio., 1992, pp. 73-77; Solid Freeform Fabrication Symposium Proceedings, University of T
REFERENCES:
patent: 4247508 (1981-01-01), Householder
patent: 4618924 (1986-10-01), Hinds
patent: 4641270 (1987-02-01), Lalloz et al.
patent: 4752352 (1988-06-01), Feygin
patent: 4844144 (1989-07-01), Murphy et al.
patent: 4863538 (1989-09-01), Deckard
patent: 4944817 (1990-07-01), Bourrell et al.
patent: 5017753 (1991-05-01), Deckard
patent: 5053090 (1991-10-01), Beaman et al.
patent: 5076869 (1991-12-01), Bourell et al.
patent: 5132143 (1992-07-01), Deckard
patent: 5147587 (1992-09-01), Marcus et al.
patent: 5155324 (1992-10-01), Deckard et al.
patent: 5156697 (1992-10-01), Bourell et al.
patent: 5296062 (1994-03-01), Bourell et al.
patent: 5658412 (1997-08-01), Retallick et al.
patent: 5687788 (1997-11-01), Caldarise et al.
Translation of Federal Patents Court Decision Mar. 16, 2000 Related to German Patent 44 40 397.
Rapid Prototyping Report, The Newsletter of the Desktop Manufacturing Industry, vol. 8, No. 4, Apr. 1998.
E-Mail correspondence of the ISATA Secretary in the oral proceedings of Mar. 16, 2000.
27th International Symposium on Automotive Technology and Automation Conference in Aachen,--Oct. 31-Nov. 4, 1994, pp. 1 to 3 and 185-191.
Japanese Casting Association Edition, "A hand book of casting (Imono Benran)", four times revised edition Maruzen, pp. 119-215, 145-195 (Jan. 20, 1986)--partial translation.
Partial Translation of Japanese Patent Publication 51-10813 Published Apr. 7, 1976.
Rompp Chemie Lexikon, Paperback Edition, Stuttgart, New York. Georg Thieme Verlag, Bd. 2 Cm-G, 1995, explanation of "Duroplaste".
A partial English translation of the underlined passage of Rompp Chemie Lexikon relating to "Duroplaste".
Brockhaus, Naturwissenschaften und Technik, Sonderausgabe, Mannheim 1989, Bd. 3, p. 267.
A partial English translation of the underlined passages of Brockhause, p. 267.
Metals Handbook, 9th edition, vol. 15 casting, p. 217.
Plastic Engineering Handbook of the Society of the Plastics Industry, Inc., 4th edition, pp. 451-452.
A concise Introduction to Ceramics, Van Nostrand Reinhold, New York, pp. 3-6.
Brockhaus, Naturwissenschaften und Technick, 1989, p. 259.
A partial English translation of the underlined passages of Brockhaus, p. 259.
Pressemitteilung von EOS GmbH Electro Optical Systems, May 1994.
Pressemitteilung von EOS GmbH Electro Optical Systems, Oct. 1994.
Modern Casting, Mar. 1993, p. 55.
3rd Int. Conf. on Rapid Prototyping at the University of Dayton, Conf. Proceedings, Dayton, Ohio, 1992, pp. 73-77.
Solid Freeform Fabrication Symposium Proceedings, University of Texas at Austin, Texas, 1991, pp. 195-204.
Flemming/Tilch: Formstoffe und Formvefahren, Deutscher Verlag fur Grundstoffindustrie, Leipzig/Stuttgart, 1. Aufl. 1993, pp. 333-367, 105 et seq.
Meyers Lexikon der Technik und der exakten Wissenschaften, Bd. 2, Bibliographisches Institut AG, Mannheim 1970, pp. 1149 et seq.
Technische Rundschau 83 (1991) 20, pp. 36-43.
Technische Rundschau 83 (1991) 44, pp. 58-61.
Materials World, Dec. 1993, pp. 656-658.
Modern Casting, Oct. 1993, pp. 25-27.
Konstruieren und Giessen 17 (1992) 4, pp. 13-19.
Technische Rundschau 82 (1991) 11, pp. 40/41.
Automobil-Production, Aug. 1992, pp. 102/104.
Laser-Praxis, May 1992, pp. LS58/LS59.
Int. Journal of Powder Metallurgy 28 (1992) 4, pp. 369-381.
Metallurgical Transactions A, 24/1993, pp. 757-759.
Modern Casting, Aug. 1993, pp. 30, 31.
Plastic World, Feb. 1993, p. 23.
Solid Freeform Fabrication Symposium Proceeding. Univ. of Texas (1991) pp. 205-212.
Solid Freeform Fabrication Symposium Proceeding. Univ. of Texas (1991) pp. 44-53.
Solid Freeform Fabrication Symposium Proceeding. Univ. of Texas (1992) pp. 63-71.
Solid Freeform Fabrication Symposium Proceeding. Univ. of Texas (1992 pp. 124-130.
Solid Freeform Fabrication Symposium Proceeding. Univ. of Texas (1992) pp. 141-145.
Keller Peter
Langer Hans
Wendt Florian
Wilkening Christian
Batten, Jr. J. Reed
EOS GmbH Electro Optical Systems
Neuner George W.
LandOfFree
Method for use in casting technology does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for use in casting technology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for use in casting technology will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-952303