Turning of Pistons with Elliptic Cross Section using Hydraulic Copying Systems

Abstract

A device to produce pistons with elliptic cross section has been developed. The device is mounted on a lathe. Principal part of the device consists of two copying syetems, one of which controls the mean position of a turning tool, and the other controls the amplitude of oscillating motion of the turning tool. Design values of a piston shape will be expressed on two templates which are followed by the hydraulic copying systems. A method of measurement and data analysis based on the finite Fourier series on the cross sectional figure of a turned piston is also discussed. Inspection on the produced piston based on the discussed method of analysis and measurement revealed good accuracy of the turning.