本研究的目的係在於探討利用撓性機構夾持加工刀具在加工過程中對工件表面粗糙度的影響;並探討藉由不同彈簧組合型式之作用下所產生不同程度之力量與表面粗糙度與輪廓真圓度之間的關係,此機構使用彈性筒夾柄裝置於CNC五軸工具機主軸上,以多軸同動運動方式進行加工程序。 本次實驗材料為模具鋼NAK80,研究步驟為利用CAD/CAM軟體進行路徑規劃,凹球曲面加工時,採取螺旋式路徑加工模具表面,藉由加工實驗探討夾具機構的撓性對於工件表面粗糙度與輪廓真圓度的影響程度。實驗項目包括利用不同彈簧組合之撓性夾具機構進行輪磨、研磨、拋光等表面光製製程,經由加工量測數據,可知在表面光製過程中使用撓性工具之特性皆可使表面粗糙度與輪廓真圓度都有所改善,提高加工工件品質。在此凹球曲面的個案中,使用撓性夾具於輪磨、研磨、拋光作用下之表面粗糙度可從1.290 μm降至0.695 μm,輪廓真圓度可從0.031 mm降至0.012 mm。
The purpose of this paper is to investigate the effects of different spring rate on the machine surface roughness and contour roundness by using an compliance mechanism attached to the grinding or polishing tools. In this study, the material used is NAK80 die tool steel. The CAD/CAM software is used to plan the reciprocate tool path for milling, grinding, lapping and polishing. The spiral path is used to create the cutting tool path for machining the mold with a concave hemisphere surface. The experimental study including grinding, lapping and polishing with four combinations of spring rate are performed on the five axis machining center. The surface roughness and roundness of machined components are measured by using measuring instruments. The experimental results show that surface roughness can be reduced by imposing compliance in the tool holder on CNC machining, the surface roughness is reduced from 1.290 μm to 0.695 μm, and the roundness is from 0.031 mm to 0.012 mm.