In Situ Measurement and Reconstruction Technology of Cylindrical Shape of High-Precision Mandrel

Abstract

The technology of in situ measurement of cylindrical shapes is an important means of improving the surface machining accuracy of cylindrical workpieces. As a method of cylindricity measurement, the principle of the three-point method has not been fully studied and applied, so it is seldom used in the field of high-precision cylindrical topography measurement. Since the three-point method has the advantages of a simpler measurement structure and smaller system error compared with other multi-point methods, the research on it is still of great significance. Based on the existing research results of the three-point method, this paper proposes the in situ measurement and reconstruction technology of the cylindrical shape of a high-precision mandrel by means of a three-point method. The principle of the technology is deduced in detail and an in situ measurement and reconstruction system is built to carry out the experiments. Experiment results are verified using a commercial roundness meter and the deviation of cylindricity measurement results is 10 nm, which is 2.56% of the measurement results of commercial roundness meters. This paper also discusses the advantages and application prospects of the proposed technology.

Research on the Integrated Process Method of In-Situ Measurement and Machining for the Mandrel of Aerostatic Spindle

“…Mandrel to be machined Considering the geometric errors inherent in the machine tool, the data gathered by each sensor probe during in-situ measurements encompasses the surface shape errors of the mandrel, radial errors of the spindle, linear motion errors of the slide, and coaxiality errors between the spindle and the tailstock. Previous research [25] has delved into the separation algorithms for all error components except the coaxiality error.…”

“…In the previous research results [25], the three-point method for in-situ measurement and reconstruction of cylindrical morphology under the condition of single-end fixation has been studied. The model of the cross-section contour can be expressed as…”

“…The in-situ measurement device, affixed to one side of the mandrel, has the capability to traverse along its axis, collecting data from various cross-sections. Previous research [25,26] indicates that the deployment of three sensor probes, positioned on a single mandrel cross-section, aids in data acquisition and cylindrical shape reconstruction. Additionally, two sensor probes, aligned on the same busbar, serve to discern the linear motion error of the slide.…”