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Surface roughness investigation and hardness by burnishing on titanium alloy

Thamizhmnaii S., Bin Omar B., Saparudin S., Hasan S.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 28, nr 2

139-142

EN

Purpose: Burnishing is a chip less machining process in which a rotating roller or ball is pressed against metal piece. It is a cold working process and involves plastic deformation under cold working conditions by pressing hard. The burnishing process help to improve surface roughness and hardness. Design/methodology/approach: The methodology adopted was using a multi roller on square titanium alloy material by designing various sliding speed/ spindle speed, feed rate and depth of penetration. Findings: The roller burnishing is very useful process to improve upon surface roughness and hardness and can be employed. It will help to impart compressive stress and fatigue life can be improved. The titanium alloy is a difficult to machine material and burnishing is difficult process for this grade material. A low surface roughness and high hardness was obtained for the same spindle rotation, feed rate and depth of penetration. Research limitations/implications: There are some limitations in increasing the operating parameters. It may develop flaw and micro cracks on the surface. Originality/value: The value of the work lies in using the results for other researches to follow and further can be continued on fatigue life.

2

Surface roughness analyses on hard martensitic stainless steel by turning

Thamizhmanii S., Bin Omar B., Saparudin S., Hasan S.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 26, nr 2

139-142

EN

Purpose: The purpose of this research paper was to analyze the surface roughness produced by turning process on hard martensitic stainless steel by Cubic Boron Nitride cutting tool. The work piece material was hard AISI 440C martensitic stainless steel. Design/methodology/approach: The experiments were designed using various operating parameters like cutting speed, feed rate and depth of cut. These operating parameters are predominantly used in carrying out the experiments. Findings: Low surface roughness was produced at cutting speed of 225 m/min with feed rate of 0.125 mm/rev and 0.50 mm depth of cut (doc). However, moderate cutting speed of 175 m/min under above feed rate and doc is an ideal operating parameters taking flank wear in to account. Research limitations/implications: While searching for references in turning of martensitic stainless steel, very limited journals are available, but very few literatures are available on turning of AISI 440C hard martensitic stainless steel which was a constraint. Practical implications: The turning of hard martensitic stainless steel brings interesting information on surface roughness, tool wear etc. and further can be extended to turn with different cutting tools. Originality/value: The value of the research work lies in using the results by other researches. The result will upgrade the knowledge about the influence parameters on surface roughness especially on martensitic stainless steel especially on martensitic stainless steels.

3

Tool flank wear analyses on martensitic stainless steel by turning

Thamizhmnaii S., Bin Omar B., Saparudin S., Hasan S.

Archives of Materials Science and Engineering

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2008

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Vol. 32, nr 1

41-44

EN

Purpose: Purpose of this research was to demonstrate tool wear by hard turning of martensitic stainless steel and this material is pronounced as difficult to machine material. The evaluation was done using CBN cutting tool on SS 440 C stainless steel with hardness between 45 to 55 HRC. Design/methodology/approach: Turning parameters like cutting speed, feed rate and depth of cut was used. The turning was carried out dry process. Findings: The flank wear was caused by abrasive action between cutting tool and work piece. The heat generated between work piece and tool tip help to form built up edge. The generated heat was conducted easily due to low thermal conductivity of the work piece material. At low cutting speed of 125 m / min with high feed rate of 0.125 mm / rev and 1.00 mm DOC. Research limitations/implications: It was difficult to decide the operating parameters due to physical and chemical properties of the material. Operating at high cutting speed would result in tool flank wear, surface damage and other wears. Originality/value: The originality of this paper lies with conducting experiment and finding optimum operating parameters. The other researches can have as reference.

4

Analyses of surface roughness by turning process using Taguchi method

Thamizhmanii S., Saparudin S., Hasan S.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 20, nr 1-2

503-506

EN

Purpose: The purpose of this research paper is focused on the analysis of optimum cutting conditions to get lowest surface roughness in turning SCM 440 alloy steel by Taguchi method. Design/methodology/approach: Experiment was designed using Taguchi method and 18 experiments were designed by this process and experiments conducted. The results are analyzed using analysis of variance (ANOVA) method. Findings: Taguchi method has shown that the depth of cut has significant role to play in producing lower surface roughness followed by feed. The cutting speed has lesser role on surface roughness from the tests. Research limitations/implications: The vibrations of the machine tool, tool chattering are the other factors which may contribute poor surface roughness to the results and such factors ignored for analyses. Originality/value: The results obtained by this method will be useful to other researches for similar type of study and may be eye opening for further research on tool vibrations, cutting forces etc.