微粒径な粒状体ダンパを適用した刃先交換式エンドミルの耐びびり性評価

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書誌事項

タイトル別名
  • Evaluation of chatter resistance of edge-changing end mills using fine particle dampers applied
  • (Experimental verification using a vertical machining center)
  • （立形マシニングセンタを用いた実験的検証）

抄録

<p>End mills that are cantilever-mounted on machine tools are prone to chattering vibration that degrades the quality of the machined surface. This is caused by the reduced rigidity when mounted with high L/D (protrusion length/tool diameter) required for deep side wall machining. To address this problem, researchers have proposed to use particle dampers with a simple structure that encloses particles having a diameter of millimeter scale in the end mill. However, particle size is an important factor in determining the damping characteristics of particle dampers, and for frequencies ≥ 200 Hz and large vibration acceleration, large damping coefficients can be obtained with finer particle sizes of 50 μm to 100 μm. In this study, an end mill with a tapered internal space filled with tungsten powder having a grain diameter of 33 μm at a filling ratio of 27 % was fabricated. The surface roughness of the machined specimen was evaluated from cutting tests using a vertical machining center at L/D = 11 and 5 levels of rotation speed in combination with 8 levels of depth of cut (total 40 conditions). Results show that smooth machined surfaces without chatter vibration were obtained under 30 conditions for the endmill with enclosed powder, while only under 16 conditions for the solid endmill without powder. Thus, it was confirmed that fine particle dampers are effective against chatter vibration of endmills.</p>

収録刊行物

  • 年次大会

    年次大会 2023 (0), J132-01-, 2023

    一般社団法人 日本機械学会

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