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K. Rama Kotaiah ¹, K. J. Babu ¹, J. Srinivas ², Kolla Srinivas ³

Affiliations
1 Dept. of Industrial and Production Engg., K. L. College of Engg., Vaddeswaram, Guntur (Dist), Andhra Pradesh, IN
2 Dept. of Mechanical Engg., NUY University, KR
3 Dept. of Mechanical Engg., R V R & J C College of Engg., Chowdavaram, Guntur (Dist), Andhra Pradesh, IN

Abstract

This paper presents an experimental investigation aimed at identifying and isolating effects of cutting conditions and over hanging length of work piece and over hanging length of tool on cutting forces and vibrations from those arising as a result of cutting tool wear. Machining test cuts were conducted using sharp tool and the effects of cutting conditions (depth of cut, cutting speed and feed rate), tool overhanging length and work piece over hanging length studied. Here experiments were conducted on EN8 steel, EN24 Steel, Mild steel and Aluminium at different cutting parameters and different overhanging lengths. Here chatter starting point length is measured from the free edge of the work piece and graphs were plotted between over hanging length verses cutting forces and chatter starting point length.

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K. Rama Kotaiah ¹, J. Srinivas ², K. J. Babu ³, Srinivas Kolla ⁴

Affiliations
1 K. L. Coilege of Engg., Vaddeswaram, Guntur (Dist), Andhra Pradesh, IN
2 Dept, of Mechanical Engg., NUY University, South Korea, US
3 Dept. of Indl. and Production Engg., K. L. College of Engg., Vaddeswaram, Guntur (Dist), Andhra Pradesh, IN
4 Dept. of Mechanical Engg., RVR & JC College of Engg., Chodawaram, Guntur (Dist), Andhra Pradesh, IN

Abstract

This paper presents effects of various cutting conditions (such as Velocity, Feed, Depth of cut), and tool geometry (such as Side Cutting Edge angle. Inclination angle. Rake angle), overhanging distance of work piece and over hanging distance of tool on regenerative chatter (Self excited vibrations) in turning process. A low mass accelerometer is placed at the tool-tip of the assembly and the system is excited at the same point by using an impulse hammer to obtain the tool-point frequency response function through spectrum analyzer or modal testing software. New test is performed when tool-overhang length changes or for different combination of system components. Regarding the analytical aspects, have to obtain any model of cutting process.This paper also presents mathematical modelling for better understanding the relationship between various cutting conditions, cutting forces and vibrations in turning machines.

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