Page 51 - rise 2017

Figure 4: Tool vibration mean value comparison.

Cold Work Tool Steel AISI D2 of 45 HRC Surface Roughness
Testing result of surface is inserting to the ezANOVA and analysed. The mean value of surface
roughness indicates that work piece machined with neoprene damping has the finest surface finish of
2.37 μm. No damping machining has result in slightly higher surface roughness of 2.72 μm (Figure 5).
However, the analysis of variance has shown that there is no significant difference surface roughness
between two damping conditions.
As for mixed ceramic (AI 2O 3 + TiCN) coated with TiN insert machining AISI D2 cold work
tool steel (45 HRC), the damping condition does not give significant affect to the performance of the
work piece surface roughness.

Figure 5: Surface roughness mean value comparison

Conclusion
Experiments have been carried out to study the performance of tool clamping technique in
conventional lathe machine with viscoelastic. Six experiments with constant parameter have been
conducted, three for each damping conditions: no damping, and viscoelastic damping (neoprene). The
effectiveness of viscoelastic damping system in reducing tool wear during machining cold work tool
steel AISI D2 of 45 HRC is evaluated. The influence of clamping technique on tool vibration is
studied. The effect of viscoelastic damping system on the surface finish is studied. The result analysis
shows that neoprene damping material is effective in reducing tool wear and tool vibration.