Optimization of Milling Parameter for Untreated and Heat Treated Polyetheretherketones (PEEK) Biomaterials

Abstract

Polyetheretherketones (PEEK) have been widely used as biomaterials for trauma, orthopedics and spinal implants. However, machining of this material poses several challenges such as rough machined surface which can affect the implant functional application. This research attempts to optimize the machining parameter (cutting speed, feed rate and depth of cut) for effectively machining Polyetheretherketones (PEEK) implant material using carbide cutting tools. Apart from optimizing machining parameters, effects of annealing condition on PEEK towards surface qualities are discuss. Response Surface Methodology (RSM) technique was used to evaluate the effects of the parameters and their interaction towards the ability of the optimum conditions. Based on the analysis results, the optimal machining parameter to obtain the smallest surface roughness values were by using spindle speed of 5754 rpm, feed rate of 0.026 mm/tooth and 5.11 mm depth of cut for un-annealed PEEK. As for the annealed PEEK to get the smallest surface roughness values were by using spindle speed of 5865 rpm, feed rate of 0.025 mm/tooth and 2 mm depth of cut.

Experimental study on the cytocompatibility of milling surface of poly-ether-ether-ketone (PEEK)

“…Due to the different processing methods and workpiece materials, the traces left on the machined surface are different in depth, density, shape, and texture [14]. As observed from the literature survey, two-dimensional (2D) surface parameters such as profile average height Ra and the average maximum height of the profile Rz are always used to characterize the machined surface topography of PEEK and its composite material [15,16]. 2D surface roughness parameters provide a simple and valuable method for quantifying contour height distribution, but they are inadequate for functional surface evaluation.…”