Performance of TiAlN-PVD coated carbide tools in milling AISI D2 hardened steels
This paper investigated the performance of PVD-TiAlN coated carbide end mills in milling AISI D2 hardened steels with a hardness value of HRC 58-62.The effect of cutting speeds on the tool wear, tool life and surface finish of machined workpiece were examined. Cutting tests were performed with const...
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| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/4042/ http://eprints.uthm.edu.my/4042/1/v77%2D284.pdf |
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| Summary: | This paper investigated the performance of PVD-TiAlN
coated carbide end mills in milling AISI D2 hardened steels
with a hardness value of HRC 58-62.The effect of cutting speeds on
the tool wear, tool life and surface finish of machined workpiece
were examined. Cutting tests were performed with constant depth of
cut (0.5mm) and feed rate(0.05mm/tooth), and at various cutting
speeds (80, 100 and 120 m/min) and radial depth of cuts (3, 4 and 5
mm) to investigate the performance of the insert under dry cutting
condition. The PVD TiAlN coated carbide insert performs
satisfactory under the conditions tested, as reasonable tool life is
recorded. By relating the machining tests and tool life curves, the
wear behavior of the coated insert was described. It is observed that
wear of the tool mainly occurred on the flank wear. Detail studies
revealed that the workpiece tends to adhere onto the rake face
without any severe crater wear. Abrasion still occurred although
TiAlN coatings are known to have high resistance to abrasive and
crater wear due to their higher hot hardness and oxidation resistance.
The findings are significant because previously only ceramic and
cubic boron nitride (CBN) inserts are successfully used for
machining. The lower cost of TiAlN coated tungsten carbide can
result in significant economic savings.
From the result it showed that tool life and the volume of material
removal decreased as cutting speed and radial depth of cut increased
due to higher temperature and contact area, respectively. The highest
tool life recorded for TiAlN-PVD coated endmills was 9.68657 min
and volume material removal (VMR) was 462.5 mm3 for 1850 mm
of length of cut at the lowest cutting speed of 80 m/min, radial depth
of cut of 3mm and feed of 0.05 mm/tooth. |
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