Effects on Dimensional Accuracy of Microstereolithographically Machined Parts after Addition of Light Absorber

الملخص

The paper’s aim is to investigate the influence of
added light absorber (Tinuvin® 327) on dimension accuracy
of three-dimensional (3D) micro-parts manufactured by a
dynamic mask projection microstereolithography (µSL)
system. One of the common problems with
stereolithography systems, and particularly with µSL is the
uncontrolled cure depth of the UV light when fabricating
down-facing surfaces. To overcome this problem, light
absorber is commonly used to control the cure depth. Yet
the influence of light absorber on the dimension accuracy of
manufactured parts is not fully understood and needs to be
investigated. This work explores the effect on part accuracy
of adding four different concentrations of Tinuvin®327 to
PIC-100 acrylate resin without light absorber. A benchmark
part has been designed to evaluate the effect of the
added Tinuvin®327 on linear, position, and geometric
dimensions. Results show that Tinuvin®327 has significant
effects on part accuracy.