ESTIMATING THE IMPACT FORCES AND OPERATING FORCES IN A LATHE TOOL USING INVERSE FINITE ELEMENT APPROACH

Inverse FEM is a technique based on the loading force identification method of the Finite element. Charging approaches are based on the reverse finding problem approach. Linear, as well as non-linear system methods, are formulated based on the minimization of assumed objective functions. The least square error is primarily used as an analytical feature between the virtual and calculated device responses. The inverse finite element method is a hybrid numerical and experimental method to determine operating forces precisely. Mechanical members may not be designed considering the extreme cutting forces. Hence the problem is taken to identify the cutting forces of a cutting lathe tool during turning operation using inverse FEM technique. Strain gauges are mounted on a lathe tool near the fixed end locations to measure the strains during turning operation. Lab view are called virtual instruments is used to evaluate the impact forces on a Lathe tool. The Lab view includes a wide range of tools to evaluate, monitor and store data and tools to help you repair the coding. The turning is carried out with the instrument and strains are measured at different speeds at known locations. The determined stresses of a device are compared by a least square approach with the empirical strains. Studies have been carried out to determine impact forces using a Lathe tool employing Inverse FEM. This method is subsequently employed in the determination of cutting force during turning operation. Inverse FEM with strain gauge as sensors is used for estimating the cutting force for different speeds and for a speed of 250 rpm the cutting force estimated was 225.63N. The same force has been measured using a lathe tool dynamometer and measurement of force has found to an error of 15%. It is found that for higher speeds the error in measurement is reduced. i.e. at higher speeds, the vibrations are less and steady state is reached. The cutting force estimated by inverse Fem using strain gauge as sensors is compared with the force measured using lathe tool dynamometer. The error in measurement is found to be 15%. This is observed to reduce as the speed increases. During this study Inverse finite element approach is applied for estimating the impact forces on cantilever beam and operating forces in a lathe.