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2 Journal of Achievements in Materials and Manufacturing Engineering

2 2011

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Performance of deep cryogenically treated and non-treated PVD inserts in milling

Thamizhmani S., Nagib M., Sulaiman H.

Journal of Achievements in Materials and Manufacturing Engineering

2011

Vol. 49, nr 2

460--466

Purpose: The purpose of the research was to analysis the tool performance between cryogenic treated and non-treated PVD inserts by milling process on Inconel 718 material in terms of surface roughness and tool wear. Design/methodology/approach: The methodology adopted is milling process with various cutting parameters like cutting speed, feed rate and constant depth of cut. Cutting speeds are 20,30,40 m/min with feed rate 0.05, 0.08 & 0.10 mm/ tooth and constant depth of cut is 0.50 mm. Findings: From the experimental work, the results were encouraging and performance is analysed on surface roughness and tool wear. Cryogenic treated inserts performed better than non treated inserts. Treated PVD inserts produced low surface roughness at high cutting speed with low feed rate. PVD treated inserts formed low flank wear where as untreated inserts formed more flank wear. Chips produced were saw tooth chips. Research limitations/implications: There are some limitations in carrying out this work due to machine vibration. There was a constraint in measuring the crater wear of the tool. Originality/value: This experimental work will help other researchers to follow on flank and crater wear using cryogenic treatment. This process can be used for difficult to cut materials like Titanium.

Machinability of hard stainless steel and alloy steel using PCBN tools

Thamizhmanii S., Sulaiman H.

Journal of Achievements in Materials and Manufacturing Engineering

2011

Vol. 46, nr 2

169--174

Purpose: of this paper was to find out the machinability of two hard materials - AISI 440 C martensitic stainless steel and SCM 400 alloy steel. It was analysed by measuring surface roughness, tool wear, cutting force and specific cutting pressure. Design/methodology/approach: The approach was adopted using various operating parameters like cutting velocity, feed rate and a constant depth of cut. The results were obtained using various measuring instruments like surface roughness tester, dynamometer, scanning electron microscope. Findings: Machinability of materials was easy in machining SCM 440 alloy steel than AISI 440 C stainless steel. Analysis was done by having low specific cutting pressure, low tool wear and low surface roughness. Research limitations/implications: The research limitations on research was due to fast wear of tools while machining stainless steel than alloy steel even the same hardness was maintained. Practical implications: More number of experiments could not conduct due to fast tool wear. Originality/value: The materials used in this experiment were not used by most of the researcher. The results obtained can be used by the other researcher and may be references.