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SELF – EXCITED VIBRATION IN ORTHOGONAL CUTTING WITH TIME LAG | ||
| AL-TAQANI | ||
| Article 1, Volume 21, Issue 4, 2008, Pages 211-221 | ||
| Author | ||
| Nassir Hassan Abdul Hussain AL-Harir | ||
| Abstract | ||
| Tests have been conducted with a newly designed force dynamometer which has a natural frequency 500 Hz and cross sensitivity ( to measure the forces accurately and separately ) is less than 2.5 %. The calibrated static forces of the dynamometer in x-axis direction is about 2500N and in y-axis direction is about 3000N with 50% safety factor. The dynamic cutting coefficients are evaluated from the steady- state cutting parameters. Modifications are made in the feed/penetration rate factor in order to determine the dynamic chip thickness coefficients. An mathematical approach was also made for investigating of the dynamic cutting forces. Dynamic instability occurs as a result of the chip thickness variations. The use of simple damper reduces the chatter and the cutting forces when increasing the feed .The simple damper has active vibration damping to dynamically stabilize the cutting process is the presented in this paper . By using computer program , the desired stability charts of the machine tool structure for different cutting conditions is determined | ||
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