In this paper, the influence of cutting tool helix angle on performance parameters viz., milling force, part deflection, surface finish, chip morphology and micro-hardness considering open straight and curvilinear thin-walled parts is analysed. It was found that end mills with helix angle of 45ºand 55ºhelped in achieving good surface finish and form accuracy while machining thin-wall parts. During machining, parts having concave geometry due to its inherent rigidity, generated higher milling force. But the wall deflection and form error was relatively lower in comparison with the straight wall thereby resulting in better surface finish. Also, formation of built-up-edge (BUE) at the cutting edge of end mills having 35° helix was noted which aided in surface defects. Back surface of the chips machined using 35ºtools showed prominent lamella like structures but tools having higher helix angles were found to produce relatively lamella free surface.
|Number of pages||21|
|Journal||International Journal of Machining and Machinability of Materials|
|Publication status||Published - 2020|
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering