公开(公告)号：US20030028278A1

公开(公告)日：2003-02-06

申请号：US10205698

申请日：2002-07-26

Applicant: 3D Systems, Inc.

Inventor： James F. Darrah ,  Xiaoshu Zu

IPC: G06F019/00

CPC classification number: G05B19/4099 ,  B22F2003/1057 ,  B22F2998/00 ,  B29C64/153 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y40/00 ,  B33Y50/02 ,  G05B2219/49018 ,  G05B2219/49035 ,  Y02P10/295 ,  B22F3/1055

Abstract: A computer-controlled apparatus and method for fabricating three-dimensional articles in layerwise fashion is disclosed. Upon dispensing a layer of a fusible powder, a laser irradiates selected locations of that layer to fuse the powder into a cross-section of the article to be formed in that layer, such that the fused cross-sections fuse together into the article. The laser is controlled in a raster scan fashion across the selected locations of the powder layer. The parallel raster scan lines are separated from one another, centerline-to-centerline, according to a selected pitch, or fill scan spacing value. The positions of the parallel scan lines are determined with respect to a coordinate system at the powder layer, rather than with respect to boundaries of the cross-section being formed; in alternating layers, the parallel scan lines are offset from one another by one-half the pitch. This arrangement of the scan lines optimizes the structural strength of the article being formed, while minimizing the number of scans required to form the article.

Abstract translation: 公开了一种以分层方式制造三维制品的计算机控制装置和方法。 在分配一层可熔粉末时，激光照射该层的选定位置，将粉末熔合成待形成在该层中的制品的横截面，使得融合的横截面熔合在一起成型。 激光器以栅格扫描方式控制在粉末层的选定位置。 平行光栅扫描线根据所选间距或填充扫描间距值彼此分离，中心线到中心线。 平行扫描线的位置相对于粉末层处的坐标系而不是关于所形成的横截面的边界确定; 在交替层中，平行扫描线彼此偏离了一半的间距。 扫描线的这种布置优化了正在形成的制品的结构强度，同时最小化形成制品所需的扫描次数。

公开(公告)号：US20030127436A1

公开(公告)日：2003-07-10

申请号：US10206647

申请日：2002-07-26

Applicant: 3D Systems, Inc.

Inventor： James F. Darrah ,  Xiaoshu Zu

IPC: B23K026/00

CPC classification number: G05B19/4099 ,  B22F2003/1057 ,  B22F2998/00 ,  B29C64/153 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02 ,  G05B2219/49018 ,  G05B2219/49035 ,  Y02P10/295 ,  B22F3/1055

Abstract: A computer-controlled apparatus and method for fabricating three-dimensional articles in layerwise fashion is disclosed. Upon dispensing a layer of a fusible powder, a laser irradiates selected locations of that layer to fuse the powder into a cross-section of the article to be formed in that layer, such that the fused cross-sections fuse together into the article. The laser is controlled in a raster scan fashion across the selected locations of the powder layer. The raster scan lines are defined, for each cross-section, to achieve an optimal fill scan time. The optimal fill scan time is determined, by the computer estimating the fill scan time by rotating the cross-section over a plurality of rotational angles, and estimating the fill scan time for each of the rotated cross-sections for at least a sample of the fill scans necessary to form the article. The actual fill scan vectors to be used in selective laser sintering of the article are rotated, from a coordinate axis at the target plane, according to the rotation of the cross-section providing the lowest estimated fill scan time.

Abstract translation: 公开了一种以分层方式制造三维制品的计算机控制装置和方法。 在分配一层可熔粉末时，激光照射该层的选定位置，将粉末熔合成待形成在该层中的制品的横截面，使得融合的横截面熔合在一起成型。 激光器以栅格扫描方式控制在粉末层的选定位置。 为每个横截面定义光栅扫描线，以实现最佳的填充扫描时间。 通过计算机通过在多个旋转角度上旋转横截面来估计填充扫描时间，并且针对至少一个样本的样本估计每个旋转截面的填充扫描时间来确定最佳填充扫描时间 填写形成文章所需的扫描。 根据提供最低估计填充扫描时间的横截面的旋转，用于物品的选择性激光烧结中的实际填充扫描矢量从目标平面的坐标轴旋转。