| 摘要: | 傳統的振動輔助方式，多為平行或垂直於工件表面的單軸向往復振動機制，垂直工件表面的振動輔助機制易造成研磨刮痕加深，導致不易得到鏡面效果，而平行工件表面則易造成在同一表面出現重複研磨痕跡，造成表面研磨不均。 本研究突破以往的振動輔助機構設計限制，以二維度（X-Y平面）橢圓形振動方式輔助磁力研磨加工，其主要目的為利用磁刷旋轉運動與工件二維振動的相互作用，形成緻密十字交叉加工路徑，進而改善加工效率與提高工件的表面品質。研究中除了探討利用鋼砂混和SiC磨粒所組成之非結合式磁性磨粒搭配振動輔助之拋光法外，進一步配合羊毛氈拋光墊輔助，觀察其對於不鏽鋼試片表面粗糙度之改善情形以及SEM表面形貌變化。 經由田口驗證實驗可以得知，對於表面粗糙度的改善最佳參數組合為：振動平台X軸方向振動頻率1Hz、SiC重量2g、鋼砂重量3.5g、研磨液重量3g、振動平台轉速1500rpm、振動平台振幅0.9mm、鋼砂號數＃120、磁極轉速550rpm（A2B2C2D3E3F3G3H2），並證明在磁力輔助二維振動拋光墊研磨加工最佳參數組合下，能於5分鐘內有效改善不鏽鋼表面粗糙度由Ra 0.14μm改善至0.03μm，改善率達78.57%。且表面粗糙度會隨著加工時間增加而降低，在研磨25分鐘後能達到Ra 0.02μm，表面改善率提高至85.71%。 進一步針對磨料比例進行實驗，得知機油重量固定為3g時，SiC粉末以及鑽石粉末各添加1g時所獲得的表面粗糙度值最好，可於5分鐘內將不鏽鋼表面粗糙度從原始值Ra 0.14μm改善至Ra 0.025μm，並於25分鐘時達到Ra 0.01μm，達到卓越的鏡面效果。利用此磨料對粗面不銹鋼做加工，可在5分鐘內將其表面粗糙度從原始值Ra 0.23μm改善至Ra 0.02μm，並於25分鐘時達到Ra 0.01μm，顯現出最佳磨料比例優良的表面粗糙度改善能力。 The normal vibration directions of vibration-assisted magnetic abrasive finishing are all parallel or perpendicular to the surface of workpiece. It’s shortcomings are easily lead to more scratches on the surface, and difficult to obtain mirror effect. This study break through previous studies,design a mechanism of two-dimensional(XY plane) vibration assisted to magnetic abrasive finishing. In the study we will use the steel particles and SiC abrasive mixture composed of non-associative with a vibration-assisted magnetic abrasive finishing, then use the polishing pad with vibration-assisted, watch the SEM surface and surface roughness. Taguchi experiment can verify that, for the improvement of surface roughness parameters for the best: X Axis Frequency 1Hz, SiC weight of 2g, Grit weight 3.5g, slurry weight 3g, vibration platform speed 1500rpm, Vibration Amplitude 0.9mm, Grit numbers # 120, pole speed of 550rpm（A2B2C2D3E3F3G3H2）.And proved vibration assisted magnetic abrasive finishing method in the best parameter combinations, can effectively improve within 5 minutes of stainless steel surface roughness by the Ra0.14μm down to 0.03μm, to improve the rate of 78.57%, ground 25 minutes later more up to Ra0. 02μm, the surface to improve the rate increased to 85.71%. Then study to abrasive ratio, we got when slurry weight 3g, increase SiC weight 1g and diamond powder 1g, the surface roughness will get better. Can effectively improve within 5 minutes of stainless steel surface roughness by the Ra0.14μm down to 0.025μm, ground 25 minutes later more up to Ra0. 01μm, and get outstanding results in mirror effect. Use this abrasive ratio to polishing the rough stainless steel,can effectively improve within 5 minutes of stainless steel surface roughness by the Ra0.23μm down to 0.02μm, ground 25 minutes later more up to Ra0. 01μm, Show the best abrasive ratio have excellent improve capacity in surface roughness. |
