Dynamic Analysis Of Hydraulic Actuated Mandrel

Abstract

Machining is an important part of the manufacturing process, as it involves precise metal removal to achieve quality, accuracy, and precision. The proper selection of cutting tools and work holding devices is essential in machining. In the manufacturing process, a work holding device is crucial. A mandrel is a work holding device that is used to grip a component during machining at high speeds and low feeds. The current work describes the design of a Hydraulic Actuated Mandrel, which is a useful work-holding device that firmly grips the work piece. The proposed material for the mandrel manufacture is Chromium Vanadium steel, because it provides uniform gripping forces and leaves no residual stresses on the work piece. Empirical relationships are used to calculate the forces and pressures exerted by the cutting tool on the work piece and the work holding device. The theory of thin cylinders is used to calculate the theoretical maximum hoop and longitudinal stresses. ANSYS software is used to create the statical model. The developed model was assessed by applying forces and pressures to the mandrel, which results in deformations and stresses. The theoretical stresses on the mandrel are compared to the stresses obtained from ANSYS. The correlation between the two analyses is found to be satisfactory. Modal analysis is used to obtain the natural frequencies and mode shapes for the same model, which are also useful for dynamic analysis. To determine the dynamic response of a structure under the action of dynamic loads, the “Mode Superposition Transient Dynamic Analysis” method is used. By using the natural frequencies and mode shapes obtained from modal analysis the dynamic analysis is done in ANSYS on the model. At various nodes, time-varying deformations are obtained. The deformations obtained in dynamic analysis at various nodes are compared to those obtained in static analysis. The level of agreement between them is deemed to be reasonable.