Sensitivity analysis of effective parameters on bone drilling force by using E-fast method

Drilling is one of the most common methods during surgery on human bones with the aim of keeping broken bones together. Due to the complexity of the material under the machining process and the sensitivity of the process, it is one of the most important and widely used mechanical methods in the field of medical engineering. Cracking, breaking and serious damage to bone tissue is a problem that may arise with increased machining forces during orthopedic operations. In this article, a second-order linear regression equation was presented in order to predict the behavior of drilling forces in terms of feed speed, tool rotational speed, drill diameter and their effective interactions. Also, to check the influence of each parameter, E-fast sensitivity analysis method was used. According to the obtained results, the rotational speed of the drill is the most effective input parameter on bone drilling forces with 57% influence. After that, the feed rate with 23% and the cutting depth with 20% are the parameters affecting the force in the bone drilling process.