BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...

14 Taxiarchis Belis and Aristomenis Antodiadis
gear. The second set refers to the machine tool, the cutting and working material
combination and the used cooling lubricant. Every possible combination of the
above parameters results in different coefficients in the model. Wear
coefficients are experimentally defined for a variety of materials and geometries
widely used in gear industry.
The middle column of the figure shows the flow chart for wear calculation
and optimal tangential displacement determination. The program has the ability
to calculate wear progress at all generating positions including transient areas.
In order to shift the hob cutter, all the group gears have to be processed. At the
bottom of the figure the outputs of the program are presented. The output
includes wear progress graphs for all generating positions, and total wear
distribution graphs for all tangential displacements. The developed program also
calculates the maximum flank wear and the corresponding number of cuts.
3.2. 3D Chips Determination
As illustrated on figure 5, this paper introduces a novel way of calculating
equivalent chip dimensions. The equivalent chip thickness calculation is more
accurate due to the fact that is measured on the 3D chip’s cross-sections. Detail
A in the upper right part of the figure, shows the chip cross-section in plane 1.
The calculation of thickness in tooth’s head and in arc distance a f
) is hereby
determined. The equation predicting the wear progress in the individual
generating positions and the equations of equivalent chip dimensions introduced
in [2] are presented in the bottom side of the figure.
Fig. 5 – Determination of equivalent chip dimensions.