Technical Brief

Comparing Slicing Technologies for Digital Light Processing Printing

[+] Author and Article Information
Tsz-Ho Kwok

Department of Mechanical, Industrial and Aerospace Engineering,
Concordia University,
Montreal, QC H3G 1M8, Canada
e-mail: tszho.kwok@concordia.ca

Manuscript received November 1, 2018; final manuscript received April 25, 2019; published online June 13, 2019. Assoc. Editor: Yong Chen.

J. Comput. Inf. Sci. Eng 19(4), 044502 (Jun 13, 2019) (4 pages) Paper No: JCISE-18-1292; doi: 10.1115/1.4043672 History: Received November 01, 2018; Accepted April 27, 2019

In additive manufacturing (AM), slicing is a crucial step in process planning to convert a computer-aided design (CAD) model to a machine-specific format. Digital light processing (DLP) printing is an important AM process that has a good surface finish, high accuracy, and fabrication speed and is widely applied in many dental and engineering industries. However, as DLP uses images for fabrication different from other toolpath-based processes, its process planning is understudied. Therefore, the main goal of this paper is to study and compare the slicing technologies for DLP printing. Three slicing technologies are compared: contour, voxelization, and ray-tracing.

Copyright © 2019 by ASME
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Grahic Jump Location
Fig. 1

Left-to-right: box with an extra internal surface; two cones sharing a same vertex; three tori are put as an assembly. The slice images are taken at the layers of 800th/1600, 764th/1527, and 145th/290.

Grahic Jump Location
Fig. 2

Inside Out: all normal vectors are pointing inward. Incoherent Normal: the normal of the highlighted region is pointing oppositely from other regions. Bad Face: existing some zero/negative-area faces. The slice images are taken at the layers of 1465th/2559, 204th/1267, and 1156th/2972.

Grahic Jump Location
Fig. 3

Left-to-right: Nut with a vertical hole on the inner surface (along the print direction); Square-torus with a flat hole perpendicular to the print direction; Triple-torus with multiple small holes. The slice images are taken at the layers of 630th/1109, 59th/2007, and 60th/301, respectively.



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