en و موضوعات مربوط Other Related Subject پژوهشي Research <p>The stability behavior of low immersion helical end milling processes is investigated in this paper. Low radial immersion milling operations involve interrupted cutting which induces chatter vibration under certain cutting conditions. Time Finite Element Analysis (TFEA) is suggested for an approximate solution for delayed differential equations encountered during interrupted milling. An improved TFEA is proposed which includes the effects of helix angle variations on cutting force, cutting time and specific cutting force coefficients. For this purpose, five different cases were distinguished for engagement limits of the cutting edges. It has been observed that an increase in the helix angle improves the stability limit of the process. This is related to the flip bifurcation lobes that start to separate from the main lobes and shape isolated unstable islands. By further increasing the helix angle, unstable islands will vanish<em> .</em></p> Low Immersion Milling; Stability; Time Finite Element Analysis; Helix Angle 115 122 http://ijiepr.iust.ac.ir/browse.php?a_code=A-10-1-85&slc_lang=en&sid=1 B. Moetakef Imani bm_imani@yahoo.com 18003194753284600401 18003194753284600401 Yes Kazemi Nasrabadi Sadeghim@modares.ac.ir 18003194753284600402 18003194753284600402 No Kazemi Sadeghi 18003194753284600403 18003194753284600403 No