Producing parts with multiple layer thicknesses by projection stereolithography Online publication date: Wed, 18-Oct-2017
by Pekka Lehtinen; Matti Kaivola; Harri Korhonen; Jukka Seppälä; Jouni Partanen
International Journal of Rapid Manufacturing (IJRAPIDM), Vol. 6, No. 4, 2017
Abstract: We present a novel method to increase the manufacturing speed and versatility in lithography-based additive manufacturing processes. Usually, a part made with additive manufacturing consists of equally thick layers that are fabricated upon one another. We use a projection stereolithography (PSL) system to manufacture parts containing several layer thicknesses, which reduces the manufacturing time and adds controllability to the system. The method is based on the possibility to control the cure depth by adjusting the operation wavelength. To demonstrate the applicability of the PSL system for this purpose, we used two different operation wavelengths to produce parts that include 50- and 300-µm layers. The method presented in this paper can be used in several PSL techniques to increase their performance by offering a new tool to control the layer thickness without affecting the manufacturing resolution.
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