Effect of tool angles on the chips generated during milling of wood by straight router-bits |
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| Authors: | Wen-Ching Su Yiren Wang Nanfen Zhu Chiaki Tanaka |
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| Institution: | (1) Department of Forest Products Science, National Chiayi University, 300 University Road, Chiayi 600, Taiwan Tel. +886-5-2717517; Fax +886-5-2717497 e-mail: wencsu@mail.ncyu.edu.tw, TW;(2) Faculty of Science and Engineering, Shimane University, Matsue 690-8504, Japan, JP |
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| Abstract: | The effect of tool angles on the shapes of chips generated by parallel-to-grain and end-grain milling was explored for China
fir and maple under fixed spindle and feed speeds and cutting depth. The milling path was up-milling by straight router-bits
with a diameter of 12 mm. The chip shapes could be distinguished as five types: spiral, splinter, flow, thin, and granules
or powder. The flow and thin chips were generated most often (on a weight percentage basis) for all tool angles investigated
for parallel-to-grain and end-grain milling of China fir and maple. More granule chips were produced with parallel-to-grain
milling than with end-grain milling for both woods. The measured chip thickness (t′) was thicker than the calculated thickness (t
max). Thicker and longer maple chips were produced by end-grain milling than by parallel-to-grain milling. The tool geometries
of 40°/15° (sharpness of the angle–rake angle), 50°/15°, and 60°/15° for China fir and 40°/25°, 50°/5°, and 60°/5° for maple
produced relatively more flow chips with parallel-to-grain milling. Furthermore, the tool geometries of 40°/5°, 50°/15° and
60°/25° produced more flow chips (weight percentage) by end-grain milling of China fir and maple.
Received: May 23, 2001 / Accepted: June 28, 2002
Acknowledgment This study was supported by a grant from the National Council of Science, Taiwan (NSC89-2313-B-415-011). |
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| Keywords: | Chip length Chip thickness Milling Tool geometry Router-bits |
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