Influence of Process Parameters on Surface Finish in Customized Bone Implant Using Selective Laser Sintering

Abstract

Selective Laser Sintering(SLS) is a powder-based Additive Manufacturing process in which parts are built by sintering of selected areas of layers of Polyamide (PA12) powder using CO2 laser. The purpose of this work is to study experimentally the effect of orientation of the component, fill scan spacing and layer thickness on the surface roughness (Ra) of the customized bone implant fabricated through SLS technique. For this study computer tomography scan data was taken and converted to standard triangulation file (.stl) format using mimics software. Taguchis Design of Experiment approach was used for this study. An L27 Orthogonal Array (OA) of Taguchi design was used. Analysis of Variance (ANOVA) was then performed on S/N (Signal-to-Noise ratio) to determine the statistical significance and contribution of each factor on the surface roughness. The results indicated that orientation and layer thickness are significant parameters to cause appreciable improvement in surface finish.

Process parameters optimization for improving surface quality and manufacturing accuracy of binder jetting additive manufacturing process

“…Chhabra and Singh (2012) investigated experimentally the effect of process parameters on the surface roughness of the castings obtained by using the ZCast direct metal casting process. Naiju et al (2012) and Lakshmi and Arumaikkannu (2014) both studied the selective laser sintering process, and analyzed the fatigue reliability and surface finish, respectively.…”

Challenges on optimization of 3D-printed bone scaffolds

“…In addition to materials and structural optimization, the process parameters should be adjusted and optimized to manufacture scaffolds with desired attributes. Numerous studies investigated the effect of process parameters on different responses such as mechanical properties (strength, elongation, Young's modulus), surface roughness, resolution and dimensional accuracy, and printing quality in different techniques including SLA [221][222][223][224], SLS [225][226][227][228][229][230][231][232][233][234], EBM [235][236][237][238][239][240][241], LENS [242,243], SLM [39,[244][245][246][247][248][249][250], 2PP [251][252][253], FDM [254][255][256], MJ [257,258], AJP [259][260][261][262], and IJP [263]…”

Process parameter optimization for porosity and compressive strength of calcium sulfate based 3D printed porous bone scaffolds

“…Best possible quality of the scaffolds can be obtained by reducing the process variability and enhancing the performance of a 3D printer through optimizing its process parameters (Hsu and Lai, 2010). Several researchers have reported optimization of process parameters of various AM process, namely, stereolithography (Onuh and Hon, 1998), fused deposition modeling (Sood et al , 2009; Srivastava and Rathee, 2018; Dong et al , 2018), selective laser sintering (Lakshmi and Arumaikkannu, 2014) etc. using Taguchi’s design of experiment approach (Bagchi, 1993).…”