Wyniki wyszukiwania - BazTech

1

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

|

2008

|

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

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

|

2008

|

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.

3

Analyses of roughness, forces and wear in turning gray cast iron

Thamizhmanii S., Hasan S.

Journal of Achievements in Materials and Manufacturing Engineering

|

2006

|

Vol. 17, nr 1-2

401--404

EN

Purpose: Purpose of this research was to analyze the surface roughness, cutting tool forces and tool wear in machining casted gray iron. Design/methodology/approach: The methodology adopted was turning process from other machining process. The turning is the widely employed manufacturing process. The tests were conducted by designing various cutting speed, feed and a constant depth of cut. In turning casted gray iron, flank wear, crater wear and built up edge are the common phenomenon. Findings: from the tests were the formation of flank wear, crater wear while machining the casted gray iron. Further research is possible in the direction measuring the residual stresses and the vibration of the cutting tool. Research limitations/implications: There are some limitations in carrying the tests namely vibration of the tool, tool wear and length of work piece. The constraint in measuring depth of crater wear was due to non availability of technology devices and equipments. However, the length of crater wear was measured for analyzes. Originality/value: The value of the work lies in the utility of the results obtained to researchers and users of the casted gray iron material for their components.