STUDY ON FORMING QUALITY AND MACHINING TIME WHEN CNC MILLING THE SURFACE WITH LOCAL CONCAVE UMBILICAL STRUCTURE

Abstract

This article presents an experimental study on the effects of some technological
parameters (cutting speed, tooth feed, tool path type) on shaping accuracy and
machining time when finishing milling surfaces with concave center structure. The
experimental model has a concave center structure surface designed on the basis of
scanning the inner surface of the flashlight reflector. Experiments were conducted
according to Taguchi OA9(33
) orthogonal matrix design and analysis of variance
(ANOVA). Research results show that when finishing milling a surface with a concave
umbilical structure, the type of tool path and tooth feed speed have a great influence
on shaping accuracy (44.3% and 42%, respectively). ), The influence of cutting speed
is quite small (12.6%). Meanwhile, the effects of cutting speed, feed per tooth and
tool path type on machining time are quite similar (36.4%, 34.1% and 29.3%
respectively). Research results also show that when machining this type of surface,
depending on the output criteria such as forming quality or machining time, it is
necessary to choose the most suitable set of machining parameters.