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Abstract:Decisive requirement for the long-term stability of the artificial joint is to minimize the release of debris particles. The wear/debris induced osteolysis and aseptic loosening are the result of failure of metal-onmetal joint implants. Severe plastic deformation (SPD) processes have been used to adapt the surface integrity properties by generating ultrafine or even nano-sized grains and grain size gradients in the surface region of work materials. These fine grained materials often show enhanced surface integrity properties such as wear resistance, corrosion resistance, fatigue life and improved functional performance compared with their predictable coarse grained counterparts. Metal-on metal bearings have a long history in total hip replacement. The experimental trials are planned according to Taguchi DOE in dry as well as in wet machining environments. It is shown that depth of cut is statistically significant on cutting force components and having dominating effect on radial and feed forces during precision turning of Co-Cr-Mo bio-implant alloy in dry machining environment. However, depth of cut and tool material both are statistically significant and show substantial effect on feed, radial and cutting forces in wet machining environment respectively. It is found that CBN insert gives better results in magnitudes of all cutting force components w.r.t. surface integrity therefore it is preferable to machine Co-Cr-Mo bio-implant alloy using CBN insert than any other tool materials.

Now-a-days glass fiber-reinforced plastics (GFRP) are always applicable in variety of engineering applications. It is used in aerospace, automotive and aircraft industries due to their well known properties. Milling of GFRP composite materials is very difficult due to its heterogeneity and the number of troubles like as surface delamination during machining affects uniqueness of the material and the machining parameters. Present paper focuses the experimental details to find out delamination factor on GFRP composite laminates by using Taguchi's DOE L9 orthogonal array. The main objective of the present work is to optimize the process parameters in the drilling of GFRP composite using Taguchi DOE and to find the significance of each process parameter using ANOVA. As far as the effect of input factors are considered, the factors drilled material and spindle speed both have nearly predominant influence on the delamination factor of drilled holes on GFRP composite by using CNC milling process.

Biomanufacturing integrates life science and engineering fundamentals to produce biocompatible products improving the pre-eminence of living. Face turning is an important process used for producing the higher accuracy on metal implants especially on sliding parts. In this experiment effect of depth of cut, feed rate and cutting speeds are considered on machined Co-Cr-Mo bio-implant alloy by application of RSM. The offline and online measured surface roughness (Ra) and cutting force (Fc) were considered respectively as response variables for investigations. The experimental result shows that depth of cut and feed rate are having predominating effect on measured surface roughness and cutting force respectively. Therefore, the developed models can be efficiently used to predict the surface roughness and cutting force on the machinability of Co-Cr-Mo alloy within 95% confidence intervals ranges of measured parameters. For checking the adequacy of model a confirmation test has been conducted. The optimized parameters can be useful for industrial developments in surface generation for bio-implants.