Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or...
Patent
1998-06-30
2000-04-11
Tentoni, Leo B.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
4251744, 700120, B29C 3508, B29C 4102, B29C 4152
Patent
active
060481889
ABSTRACT:
An improved stereolithography system for generating a three-dimensional object by creating a cross-sectional pattern of the object to formed at a selected surface of a fluid medium capable of altering its physical state in response to appropriate synergistic stimulation by impinging radiation, particle bombardment or chemical reaction, information defining the object being structurally specified to reduce curl, stress and distortion in the ultimately formed object, the successive adjacent laminae, representing corresponding successive adjacent cross-sections of the object, being automatically formed and integrated together to provide a step-wise laminar buildup of the desired object, whereby a three-dimensional object is formed and drawn from a substantially planar surface of the fluid medium during the forming process. A stereolithographic distortion known as curl is defined, and several techniques to eliminate or reduce curl are described, including dashed line, bent line, secondary structure, rivets, and multi-pass techniques. In addition, a quantitative measurement of curl known as the curl factor, and a test part known as a quarter cylinder are described, which together can be used to measure the effectiveness of the above techniques in reducing curl.
REFERENCES:
patent: 2775758 (1956-12-01), Munz
patent: 4139654 (1979-02-01), Reed
patent: 4575330 (1986-03-01), Hull
patent: 4752498 (1988-06-01), Fudim
patent: 4801477 (1989-01-01), Fudim
patent: 4945032 (1990-07-01), Murphy et al.
patent: 4961154 (1990-10-01), Pomerantz et al.
patent: 5015424 (1991-05-01), Smalley
patent: 5031120 (1991-07-01), Pomerantz
patent: 5059359 (1991-10-01), Hull et al.
patent: 5104592 (1992-04-01), Hull et al.
patent: 5137662 (1992-08-01), Hull et al.
patent: 5273691 (1993-12-01), Hull et al.
patent: 5785918 (1998-07-01), Hull
H. Kodama, "Automatic Method for Fabricating a Three-Dimensional Plastic Model With Photo-Hardening Polymer," Review of Scientific Instruments, vol. 52, No. 11, Nov. 1981, pp. 1770-1773.
A.J. Herbert, "Solid Object Generation," Journal of Applied Photographic Engineering, 8(4), Aug. 1982, pp. 185-188.
E.V. Fudim, "A New Method of Three-Dimensional Micromachining," Mechanical Engineering, Sep. 1985, pp. 54-59.
E.V. Fudim, "Sculpting Parts With Light," Machine Design, Mar. 1986 pp. 102-106.
T. Nakai and Y. Marutani, "Fabrication of Three-Dimensional Objects Using Laser Lithography," Systems and Computers in Japan, vol. 20, No. 3, Mar. 1989, pp. 58-67.
Freed Raymond S.
Hull Charles W.
Lewis Charles W.
Smalley Dennis R.
Spence Stuart T.
3-D Systems, Inc.
D'Alessandro Ralph
Tentoni Leo B.
LandOfFree
Stereolithographic curl reduction does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stereolithographic curl reduction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stereolithographic curl reduction will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1172498