Investigate and analyze the tool wear surface characterization of high speed steel (HSS) Processed by physical vapor deposition (PVD)
Final Year Project Report
Mechanical Engineering Projects
ABSTRACT:
After studying and experimentations, the effects of wear and friction on physical vapor
deposition (PVD) coated on high speed steel (HSS) is investigated and analyzed. High
speed steel (HSS) is mainly used for making cutting tools. So, the cutting tools are
exposed to high wear and friction during machining operations. Titanium nitride (TiN)
coating through physical vapor deposition (PVD) technique was done on specimens of
high-speed steel (HSS). Physical vapor deposition (PVD) of titanium nitride (TiN)
improves the mechanical properties of high-speed steel (HSS). The tests perform to
validate the hardness, surface roughness and wear rate. Pin on Disk wear test was
performed on uncoated and coated specimens. Pin shaped specimens were made from
high speed steel (HSS) by using EDM wire cut. Pins have 8mm diameter and 25mm
length. It was found by wear and friction analysis from pin on disk test that there is a
significant decrease in wear rate and coefficient of friction.
Hardness of specimens was also compared before and after coating and results showed
the improved hardness. The ”profilometer was used to measure the surface roughness
of "uncoated and coated specimens and significantly decrease in surface irregularities
which results decrease in surface roughness. These results will ultimately improve the
tool life or service life of tool that will save time and money.
Result and Discussion:
Measurement of hardness
Measurement of surface roughness
Measurement of wear rate
Measurement of coefficient of friction
Selection of substrate material
Preparing specimen for pin or disk test
Coating on substrate material or tin
Ultrasonic cleaning and mirror polishing of specimen
Hardness test of tin or HSS
Keywords:
Coating, Corrosion, Hardness, Physical vapor deposition, Pin on Disk wear Test, Surface
roughness, TiN (Titanium Nitride), Tool life, Wear rate
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