Surface roughness and tool wear on cryogenic treated CBN insert on titanium and Inconel 718 alloy steel
Machining of materials by super hard tools like CBN and PCBN is to reduce tool wear to obtain dimensional accuracy, smooth surface and more number of parts per cutting edge. Wear of tools is inevitable due to rubbing action between work material and tool edge. However, the tool wear can be minimized...
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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/4040/ http://eprints.uthm.edu.my/4040/1/v77%2D300.pdf |
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| Summary: | Machining of materials by super hard tools like CBN
and PCBN is to reduce tool wear to obtain dimensional accuracy,
smooth surface and more number of parts per cutting edge. Wear of
tools is inevitable due to rubbing action between work material and
tool edge. However, the tool wear can be minimized by using super
hard tools by enhancing the strength of the cutting inserts. One such
process is cryogenic treatment. This process is used in all materials
and cutting inserts which requires wear resistance. The cryogenic
process is executed under subzero temperature -196 degree C for
longer period of time in a closed chamber which contains liquid
nitrogen. In this research, CBN inserts with cryogenically treated was
used to turn difficult to cut metals like Titanium, Inconel 718 etc.
The turning parameters used are different cutting speeds, feed rates
and depth of cut. In this research, Titanium and Inconel 718 material
were used. The results obtained are surface roughness, flank wear
and crater wear. The surface roughness obtained on Titanium was
lower at high cutting speed compared with Inconel 718. The flank
wear was low while turning Titanium than Inconel 718. Crater wear
is less on Inconel 718 than titanium alloy. All the two materials
produced saw tooth chips and one reason for more crater wear
formation while turning Inconel 718. More abrasion occurred on the
flank side in turning Titanium than Inconel 718. The turning on
Inconel 718 alloy steel formed built up edge in all the parameters.
The formation of built up edge deteriorated the Inconel 718 alloy
steel surface. More depth of cut did not affect the quality of machine
surface, infact it produced smooth surface. |
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