Journal Published Online: 12 July 2019
Volume 49, Issue 3

Observations of Machining Performance during Turning AA6351-B C Composite

CODEN: JTEVAB

Abstract

This study investigates the machining characteristics of stir-cast AA6351-boron carbide composite under dry condition. The influences of input parameters on output responses, such as temperature rise, cutting force, tool wear, and surface roughness, are investigated. The monolayer titanium nitride–coated solid carbide insert tool CNMG120412 (80° diamond shaped with a nose radius of 1.2 mm) has been used to perform the experiments. The temperature and cutting forces are measured by using a FLIR infrared thermal image camera and piezoelectric dynamometer. The reduction in temperature is noted at a low spindle speed (Vc), which is due to the discontinuous chip formation. The increase in feed rate (f) has reduced the coefficient of friction (μ) as a result of a decrease in the friction angle. The lowest value of μ, 0.5567, is obtained at a low Vc and a high f. The increase in temperature at a high Vc reduces the specific cutting pressure and results in a low thrust force. The tool wear is examined by using a scanning electron microscope to analyze the wear mechanisms. At a high Vc, an increase in temperature reduces mechanical load and protects the tool from abrasion wear; it results in good surface finish. A low surface roughness value of 1.08 μm is achieved at a high Vc and ensures the surface quality.

Author Information

Samy, G. S.
Faculty of Mechanical Engineering, Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu, India
Kumaran, S. Thirumalai
Faculty of Mechanical Engineering, Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu, India
Uthayakumar, M.
Faculty of Mechanical Engineering, Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu, India
Pages: 14
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Stock #: JTE20180429
ISSN: 0090-3973
DOI: 10.1520/JTE20180429