異方剛性設計によリ振動モード制御を実現したパッシブ構造体ダンパ「P-DACS」の制振性能評価

摘要

工作機械で生じる振動は，加工面品位や加工能率を低下させるほか，位置決め運動の精度低下を引き起こす要因となる.振動を低減するためには，工作機械を構成する要素（コラム，テーブル，軸受·案内など）の静剛性や振動減衰性を高める必要がある.しかし，加工条件により様々な振動モードが発生し，その節や腹の位置も加工の進展により逐次変化するため，振動の腹に設置する従来のダンパでは十分な制振効果が得られない場合が多い.また，スペースの制約からダンパを設置できないこともある.%Recently, we developed the novel damper named as Passive Damper with Anisotropic Composite Structure (P-DACS). It is consist of metal and polymer structures. P-DACS can tune static and dynamic characteristics by controlling its anisotropic of stiffness with changing several design parameters and polymer material. Additive manufacturing technology allows realizing P-DACS and also mechanical structural members such as bearings, beams embedded the P-DACS. In this paper, the influence of design parameters on the whole static and dynamic characteristics of P-DACS, and evaluating its damping performance of table which is supported by P-DACS. As the results of numerical analysis, the specific stiffness and damping ratio of P-DACS can be controlled by the design parameters. Similarly the vibration characteristics of the table supported by P-DACS is able to control with the damper design.