[특허]Molds for casting with customized internal structure to collapse upon cooling and to facilitate control of heat transfer

[미국특허] Molds for casting with customized internal structure to collapse upon cooling and to facilitate control of heat transfer 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B22D-046/00 B22C-009/02
출원번호	US-0577920 (2000-05-24)
발명자 / 주소	Emanuel M. Sachs Won B. Bang Michael J. Cima
출원인 / 주소	Massachusetts Institute of Technology
대리인 / 주소	Steven J. Weissburg
인용정보	피인용 횟수 : 34 인용 특허 : 9

초록 ▼

A new mold solves problems that arise from differential changes in geometry inherent to casting metal in a ceramic mold, by control of the internal morphology between the surfaces of the mold that face the casting, and that face the external environment. Layered fabrication techniques are used to create a ceramic mold. For example, an internal geometry composed of a cellular arrangement of voids may be created within the mold wall. Structures may be designed and fabricated so that the ceramic mold fails at an appropriate time during the solidification and/or cooling of the casting. Thus, the casting itself is not damaged. The mold fails to avoid rupture, or even distortion, of the casting. A thin shell of ceramic defines the casting cavity. This shell must be thin enough to fail due to the stresses induced (primarily compressive) by the metal next to it and partly adherent to it. A support structure is provided with a morphology that supports the thin shell that defines the casting geometry, yet that also fails as the casting solidifies and/or cools. Typically, the support structure is a skeletal network with voids therebetween. The skeletal elements may be struts, or sheets or both. At least the following two failure mechanisms may be exploited in the design of the support structure: bending in the structure; and under compressive loads, either by buckling of a support member or, breakage under compressive loading. The failure of the support structure may also be due to a combination of bending and compression.

대표청구항 ▼

1. A method of molding a part, said method comprising the steps of:a. providing a mold that has: i. a thin inner shell, which: A. defines a three dimensional cavity; B. is impervious to flow of liquid molding material therethrough; C. is configured to not fail under any stresses arising within said inner shell due to pouring of said liquid molding material into said cavity; and D. is configured to fail under stresses arising within said inner shell as any such molding material solidifies or cools; and ii. a three-dimensional support body that supports said inner shell, which support body is defined by an internal structure of supporting skeletal elements having voids therebetween, and which: A. is configured to not fail under any stresses arising within said support body due to pouring of said liquid molding material into said cavity; and B. is configured through the locations and orientations of the skeletal elements within its internal structures to fail at predetermined regions relative to the locations of features of the casting part, under stresses arising within said support body as any such molding material solidifies and cools; b. providing liquid molding material in said cavity; c. maintaining said mold under conditions such that said molding material solidifies into said part; and such that said solidified part and said mold cools; d. maintaining said shell and supporting body such that both fail at said predetermined regions relative to the locations of features of the casting part, as said molding material experiences dimensional change, and such that said molding material deforms less than its yield strain as it solidifies and cools; and e. removing said failed mold from said solidified, cooled part.

이 특허에 인용된 특허 (9) 인용/피인용 타임라인 분석

Sachs Emanuel M. ; Cima Michael J. ; Bredt James F. ; Khanuja Satbir ; Yu Richard Li-chao, Ceramic mold finishing techniques for removing powder.
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Sachs Emanuel ; Michaels Steven P. ; Allen Samuel M., Enhancement of thermal properties of tooling made by solid free form fabrication techniques.
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Dickens Philip Michael,GBX ; Hague Richard James Mackenzie,GBX, Method of making a three-dimensional object.
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Sachs Emanuel M. (Somerville MA) Cima Michael J. (Lexington MA) Bredt James F. (Watertown MA) Khanuja Satbir (Cambridge MA), Process for removing loose powder particles from interior passages of a body.
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Sachs Emanuel ; Curodeau Alain ; Fan Tailin ; Bredt James F. ; Cima Michael ; Brancazio David, Three dimensional printing system.
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Cima Michael (Lexington MA) Sachs Emanuel (Somerville MA) Fan Tailin (Cambridge MA) Bredt James F. (Watertown MA) Michaels Steven P. (Melrose MA) Khanuja Satbir (Cambridge MA) Lauder Alan (Boston MA), Three-dimensional printing techniques.
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Sachs Emanuel M. (Somerville MA) Haggerty John S. (Lincoln MA) Cima Michael J. (Lexington MA) Williams Paul A. (Concord MA), Three-dimensional printing techniques.
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Sachs Emanuel M. (Somerville) Haggerty John S. (Lincoln) Cima Michael J. (Lexington) Williams Paul A. (Concord MA), Three-dimensional printing techniques.
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Sachs Emanuel M. ; Cima Michael J., Three-dimensional product manufacture using masks.
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이 특허를 인용한 특허 (34) 인용/피인용 타임라인 분석

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Kostka, Jr., Stanislav; Cunha, Frank J., Gas turbine engine component with vascular cooling scheme.
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Bredt, James F.; Anderson, Timothy; Russell, David B.; Clark, Sarah L.; DiCologero, Matthew J., Material systems and methods of three-dimensional printing.
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Vermeer, Adrianus Johannes Petrus Maria; Maalderink, Herman Hendrikus; Jamar, Jacobus Hubertus Theodoor; Rijfers, Andries; Vaes, Mark Herman Else, Method and apparatus for layerwise production of a 3D object.
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Frasier, Donald J.; Brady, Guy Allen; Kush, Matthew T.; Vessely, Patrick A., Method and apparatus for production of a cast component.
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Frasier, Donald J.; Schlienger, M. Eric; Vessely, Patrick A., Method and apparatus for production of a cast component.
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Bucci, David Vincent; Kottilingam, Srikanth Chandrudu; Singh, Prabhjot, Method for 3-D printing a pattern for the surface of a turbine shroud.
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Bredt, James F.; Clark, Sarah L.; Uy, Evert F.; DiCologero, Matthew J.; Anderson, Timothy; Tarkanian, Michael; Williams, Derek X., Methods and compositions for three-dimensional printing of solid objects.
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Sachs,Emanuel M.; Gleason,Blake W.; Serdy,James G., Positive pressure drop-on-demand printing.
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Yang, Xi; Mueller, Boyd A., Reinforced shell mold and method.
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[미국특허] Molds for casting with customized internal structure to collapse upon cooling and to facilitate control of heat transfer 원문보기

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이 특허에 인용된 특허 (9) 인용/피인용 타임라인 분석

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[미국특허] Molds for casting with customized internal structure to collapse upon cooling and to facilitate control of heat transfer 원문보기

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이 특허에 인용된 특허 (9) 인용/피인용 타임라인 분석

이 특허를 인용한 특허 (34) 인용/피인용 타임라인 분석

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