Sažetak
Worms can be produced using special machines or standard lathes equipped with a whirling
thread-cutting device. A blank is placed on the mandrel and tightened using the three-jawed chuck of
the standard lathe. If the workpiece diameter is excessively large, passage through the driven pulley
is not possible, and the workpiece cannot be supported. Therefore, a new tool holder for whirling
devices is needed. During the whirling process, vibrations in the form of machine velocity amplitudes
were measured. After whirling was complete, roughness values were calculated. Using numerical
procedures of Wolfram Mathematica 10, vibration peaks were extracted, from which frequencies and
maximum amplitudes were determined. The data were then inputted into Design Expert, and the
rotational speed and amount of separated material were optimized. The results of the study showed
that the quality of the processed surface did not improve with processing in two passes of the tool.
The measured vibration amplitudes on the lathe carrier and thread whirling attachment increased
with cutting speed at the same cutting depth, whereas the quality of the machined surface was best
at the smallest and largest cutting depths.
Ključne riječi
thread-cutting whirling process surface quality vibration profile
