Journal of Applied Mechanical Engineering

Enhancement of geometric accuracy of five-axis machining centers based on on-machine workpiece measurement

International Conference on Design and Production Engineering

July 25-26, 2016 Berlin,Germany

Ryuta Sato

Kobe University, Japan

Posters & Accepted Abstracts: J Appl Mech Eng

Abstract:

The five-axis machining centers make possible to machine complex parts such as impellers and also make possible to reduce the setup changing time, because of the machining center can rotate the tools or work-pieces by using rotary axes. The five-axis machining centers also make possible to get more beautiful machined surface by ball-end milling, because of the machining center can avoid the tool end point which has zero circumferential velocity. On the other hand, the rotary axes have geometrical errors such as offset and parallelism of the rotational centers. Since the geometrical errors deteriorate the accuracy of machined parts, it is important to identify and compensate the errors. It is also clarified; however, the geometrical errors change during the machining operation due to the thermal deformation and elastic deformation of the axes. This fact means that the geometrical errors are changing during the machining and the errors should be identified before the finishing process which determines the final geometrical shape of the parts. This fact also means that the geometrical errors should be identified under the same loading mass condition with the machining. This study demonstrates the identification and compensation of the geometrical errors of rotary axes in five-axis machining centers, based on the on-machine measurement results of machined work-piece. The geometrical errors can be identified from the shape geometry of the work-piece machined by fiveaxis motions because the shape geometry includes the influence of geometrical errors.

Biography :

Email: sato@mech.kobe-u.ac.jp