Design and Analysis of Servo Housing Fixture to Improve the Dynamic Performance

Abstract

: Fixtures are used to mount the work-piece to perform the operation such as turning, milling or machining. Fixture designs are very important parameter to achieve the balancing while performing all the operation. Industry is facing an issue with the turning operation on the servo housing fixture and accuracy of the turning is not achieving as per the standard due to the instability in rotation. This unstable rotation is caused due to the unbalance in the servo housing mass. The purpose of this research is to optimize the fixture design and improvement in the dynamic performance by doing parametric changes in the existing design of fixture. Work piece mounted on the fixture will transfer the static and dynamic load on the fixture by the different operation on the work piece. Hence fixture is sensitive to the loading on the fixture due to which the stresses developed. These stresses in the fixture is predicted using the finite element method, where the Eigen frequencies and Eigen vector is predicted using the dynamic analysis. Stress gradient has been extracted from the modal analysis which gives the high strain density region. Optimization is done in such a way that the dynamic performance of the fixture improves as compare the existing design. Balancing in the fixture design is more important, any system generate more response if kept unbalanced. Using this methodology the balancing in the fixture design is analyzed using harmonics analysis. Purpose of this analysis is to reduce the response in the structure and to shift the first harmonic and second harmonics by great extent.