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公开(公告)号：FR2878771A1
公开(公告)日：2006-06-09
申请号：FR0512351
申请日：2005-12-06
Applicant: 3D SYSTEMS INC
Inventor： RUATTA STEPHEN A , MOUSSA KHALIL M
Abstract: Dans ce procédé, une poudre fusible est exposée à plusieurs balayages de laser (114) à des niveaux d'énergie contrôlés et pendant un temps suffisant pour fondre et densifier la poudre et en évitant la fusion de particules hors de la frontière de fusion (110). Un balayage initial à énergie relativement élevée est effectué pour fondre la poudre, suivi par des balayages contrôlés d'énergie inférieure pour densifier la fusion, et séparés dans le temps pour dissiper la chaleur dans la masse de la pièce environnante. La vitesse et l'ampleur de la fusion sont contrôlés de sorte que chaque balayage successif sert à fondre les particules par échelons progressifs discrets. Les dimensions finales, les propriétés mécaniques et la densité de l'élément (110) peuvent être améliorées.
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公开(公告)号：GB2421003B
公开(公告)日：2009-12-09
申请号：GB0523280
申请日：2005-11-15
Applicant: 3D SYSTEMS INC
Inventor： RUATTA STEPHEN A , MOUSSA KHALIL M
Abstract: The invention relates to a method producing parts using laser sintering wherein a fusible powder is exposed to a plurality of laser scans at controlled energy levels and for time periods to melt and densify the powder and in the substantial absence of particle bonding outside the fusion boundary. Strength is improved up to 100% compared to previous methods. An example includes a relatively high energy initial scan to melt the powder followed by lower energy scans controlled to densify the melt and separated in time to dissipate heat to the surrounding part cake. The rate and extent to which the powder particles are fused together can be controlled so that each successive scan can be used to fuse the particles together in discreet incremental steps. As a result, the final dimensions of the part and its density and mechanical properties can be improved compared to conventional methods and part growth avoided.
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公开(公告)号：FR2878771B1
公开(公告)日：2009-05-29
申请号：FR0512351
申请日：2005-12-06
Applicant: 3D SYSTEMS INC
Inventor： RUATTA STEPHEN A , MOUSSA KHALIL M
Abstract: The invention relates to a method producing parts using laser sintering wherein a fusible powder is exposed to a plurality of laser scans at controlled energy levels and for time periods to melt and densify the powder and in the substantial absence of particle bonding outside the fusion boundary. Strength is improved up to 100% compared to previous methods. An example includes a relatively high energy initial scan to melt the powder followed by lower energy scans controlled to densify the melt and separated in time to dissipate heat to the surrounding part cake. The rate and extent to which the powder particles are fused together can be controlled so that each successive scan can be used to fuse the particles together in discreet incremental steps. As a result, the final dimensions of the part and its density and mechanical properties can be improved compared to conventional methods and part growth avoided.
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Patent Agency Ranking
公开(公告)号：DE60214089T2
公开(公告)日：2007-04-12
申请号：DE60214089
申请日：2002-06-24
Applicant: 3D SYSTEMS INC
Inventor： NGUYEN HOP D , MOUSSA KHALIL M , MANNERS CHRIS R
IPC: B29C67/00
Abstract: A method and an apparatus for forming a three-dimensional object in layerwise fashion by selectively solidifying a build material is disclosed. The invention is applicable to stereolithography involving layer-by-layer photocuring of a fluid photopolymer by radiation such as ultra-violet light. Data for performing the stereolithography is based on CAD data. A main part area (10) is solidified, followed by a delay or pause for a desired period of time to permit shrinkage to occur, and then, in multiple drawings (13,17) of the main part borders, solidifies the borders from the portion closest to the main part (10) outwardly to final border (15) farthest from the main part which is the true CAD boundary.
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公开(公告)号：DE60214089D1
公开(公告)日：2006-10-05
申请号：DE60214089
申请日：2002-06-24
Applicant: 3D SYSTEMS INC
Inventor： NGUYEN HOP D , MOUSSA KHALIL M , MANNERS CHRIS R
IPC: B29C67/00
Abstract: A method and an apparatus for forming a three-dimensional object in layerwise fashion by selectively solidifying a build material is disclosed. The invention is applicable to stereolithography involving layer-by-layer photocuring of a fluid photopolymer by radiation such as ultra-violet light. Data for performing the stereolithography is based on CAD data. A main part area (10) is solidified, followed by a delay or pause for a desired period of time to permit shrinkage to occur, and then, in multiple drawings (13,17) of the main part borders, solidifies the borders from the portion closest to the main part (10) outwardly to final border (15) farthest from the main part which is the true CAD boundary.
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公开(公告)号：DE60115136T2
公开(公告)日：2006-08-17
申请号：DE60115136
申请日：2001-04-24
Applicant: 3D SYSTEMS INC
Inventor： HANNA STEPHEN D , MOUSSA KHALIL M
Abstract: A process for forming three-dimensional objects layer-by-layer from a photocurable medium uses differential curing of the photocurable medium to form cured solid regions with discrete mechanical properties at selected locations to tailor a part's properties to individual needs. A stereolithographic process and apparatus building objects in a container 21 (vat) of liquid photocurable medium (22) is described in which a UV laser light source (26) is selectively applied to a surface of the medium (22) in accord with object-defining data (19). The laser (26) can be controlled in accord with different build styles to produce parts having different mechanical properties, particularly relating to high temperature resistance and durability.
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公开(公告)号：GB2421003A
公开(公告)日：2006-06-14
申请号：GB0523280
申请日：2005-11-15
Applicant: 3D SYSTEMS INC
Inventor： RUATTA STEPHEN A , MOUSSA KHALIL M
Abstract: The invention relates to a method for producing parts using laser sintering wherein a fusible powder is exposed to a plurality of laser scans at controlled energy levels and for time periods to melt and densify the powder whereby strength is improved up to 100% compared to previous methods. The method comprises a relatively high energy initial scan to melt the powder followed by lower energy scans controlled to densify the melt and separated in time to dissipate heat to the surrounding part cake. The rate and extent to which the powder particles are fused together may be controlled by a computer so that each successive scan can be used to fuse the particles together in discreet incremental steps. As a result, the final dimensions of the part and its density and mechanical properties can be improved compared to conventional methods and part growth avoided. Later embodiments relate to apparatus for carrying out said method.
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公开(公告)号：DE60115136D1
公开(公告)日：2005-12-29
申请号：DE60115136
申请日：2001-04-24
Applicant: 3D SYSTEMS INC
Inventor： HANNA STEPHEN D , MOUSSA KHALIL M
Abstract: A process for forming three-dimensional objects layer-by-layer from a photocurable medium uses differential curing of the photocurable medium to form cured solid regions with discrete mechanical properties at selected locations to tailor a part's properties to individual needs. A stereolithographic process and apparatus building objects in a container 21 (vat) of liquid photocurable medium (22) is described in which a UV laser light source (26) is selectively applied to a surface of the medium (22) in accord with object-defining data (19). The laser (26) can be controlled in accord with different build styles to produce parts having different mechanical properties, particularly relating to high temperature resistance and durability.
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