In orthopedic surgeries, the bone drilling is one of the most important biomechanic processes that has used. ،This mechanical process is very important, sensitive and all-purpose in biomechanical engineering, because its complexity and special conditions. Bone drilling process has advanced by roboots and CNC machin entrance into the realm of orthopedic surgeries. The problematic issue during operation is the high increase in drilling process temprature which leads to the so-called thermal necrosis . It is not clear quality of enfluence of tool rotational speed and feed rate on the temprature and force responses and so it can be seen confilicts among different researcher results frequently. In this paper it is performed mathematical modeling and design of experiments on the input factors and output parameters of bone drilling. The effect of input factors and interaction of input factors have investigated. Increasing rotational speed the temperature increases where as the feed rate behavior is complex because contact duration between drill bit and bone so the increasing temperature take places because the low feed rate or increasing force and friction. In addition increasing the drill bit diameter increases the tempratures. Also the sobol sensitivity analysis method has used to investigate effect of each parameter in which rotational speed, feed rate and drill bit diameter have most effect respectiviely on temperature instantaneously. Also optimization process performed on temperature behavior, hence the minimum temprature is 37 0C when the diameter of drill bit 2.5 mm, rotational speed 500 rpm and feed rate 30 mm/min.

Keywords: Drilling, Bone, Temperature, Response Surface Method, Optimization

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