磁力噴砂加工表面之研究

Study of Magnetic assisted sandblasting with surface processing

李健銘(Chien-ming Lee)

指導教授 ： 顏炳華

國立中央大學/工學院/機械工程研究所碩士在職專班/碩士(2011年)

摘要

摘 要
噴砂主要是針對金屬表面進行破壞性的加工，利用噴射磨料對金屬表面衝擊，讓表面產生像顆粒化般的凹陷，目的是讓金屬表面能產生霧化或咬花及去除毛邊的效果。
本研究主要是針對噴砂加工搭配磁力的手法，選用鋁材6061
作為加工材料，藉由其材質柔軟及加工後皺褶的現象,縮短噴砂的加工時間,觀察到磁力噴砂對應表面粗糙度的加工趨勢，進一步研究磁力噴砂的加工特性及對表面加工的影響。
首先安排前期實驗及L18實驗，將磁力噴砂的加工參數做規劃，如磁鐵擺放方式(直立or橫擺)及噴嘴角度及噴嘴距離及磁鐵距離及磁力強度及噴射強度等對加工結果(粗糙度及移除量及加工範圍)的影響。由前期實驗結果將加工時間及噴嘴角度固定，因噴嘴角度影響加工範圍及區域，對於粗糙度影響較小，加工時間則是因鋁材6061加工後會有皺褶的現象，而縮短加工時間觀察加工趨勢。而後經L18實驗結果發現噴嘴距離及磁鐵距離同為變數時，磁鐵相關的加工參數貢獻度不明顯，因此後續單因子實驗中將噴嘴角度及噴嘴距離定義為固定參數。
由單因子實驗結果可以得到各磁鐵配置對應的粗糙度趨勢，在噴射壓力5kgf的配置下，磁力強度550mT及磁鐵距離80mm磁鐵橫擺時會有最佳的粗糙度表現，並可得到加工區域靠近磁鐵端會有較佳的粗糙度表現的結論，再輔以搭配回歸方程式所求得的方程式，則後續即可使用公式先行預估不同磁力配置下的粗糙度,有效的省去實驗次數,並加速找到較佳化結果。

關鍵字

回歸方程式 ； 田口法 ； 表面粗糙度 ； 磁力噴砂

並列摘要

Abstract
Sandblasting is mainly directed to destructive process on the metal surface. Use abrasive to impact the metal surface, let surface occur a depression like granulate,goal is to produce atomized metal surface etching and removal of flash effect。
This study focuses on the sand blasting technique with a magnetic,and select aluminum 6061 for processing materials,with soft texture and folds of the phenomenon of post-processing,can shorten processing time of sandblasting,observed in the corresponding magnetic surface roughness of sandblasting processing trends, further study of magnetic properties and processing of sandblasting on the surface。
first, arrange the preliminary experiment and L18 experiment, to do planning for the processing parameters of the magnetic sandblasting, if magnet placed way (vertical or yaw)and nozzle angle and nozzle distance and the distance of magnetic and magnetic intensity and spray on the processing results (roughness and removal rate and processing range) effects。
Preliminary experimental results point to a fixed processing time and nozzles angle. Because the angle of the nozzle effect processing area and region, less affected of roughness, processing time is due to be processed 6061 aluminum folds of the phenomenon, and shorten the processing time to observe the processing trends.
Then by the L18 results the nozzle distance and distance of magnetic as the variable at the same time, magnet processing parameters associated with no significant contribution, therefore fixed the angle of the nozzle and nozzle distance at follow-up single factor experiments。
The single factor experiments results can be obtained from the magnetic configuration corresponding to the roughness of the trend, the configuration of the jet pressure 5kgf, magnetic intensity 550mT and magnet distance 80mm and when the magnet yaw will be the best performance of the roughness，and get near the magnet end of processing areas will have better performance of the conclusions of the roughness, then used with equation obtained by the regression equation, follow-up can be estimated using the formula in advance of the roughness of the different magnetic configurations, effectively eliminating the number of experiments, and accelerate to find the optimal results。

並列關鍵字

Regression equation ； Taguchi method ； Surface roughness ； magnetic sandblasting

參考文獻

23. Hideo Nakae, Ryuichi Inui, Yosuke Hirata and Hiroyuki Saito

4. WonJo Park,Sunchul Huh,SungHo Park”A study on the Fatigue characteristics of Al6061-T651 by Shot Peening Velocity”key Engineering Materials,326-328,1093,(2006).

6. H. Wensink, H. V. Jansen, J. W. Berenschot, M. C. Elwenspoek, “Mask materials for poeder blasting”, J Micromech. Microeng10,pp.175-180,(2000).

7. Manabu Wakuda，Yukihiko Yamauchi，Shuzo Kanzaki“Material response to particle impact during abrasive jet machining of aluminaceramics“,Journal of Materials Processing Tech. Vol.132 Issue 1-3,Page 177-183,(2003)

8. E Belloy, A Sayah, MAM Gijs, “Oblique powder blasting for three-dimensional micromachining of brittle materials”, Sensors and Actuators vol. 92,pp.358-363, (2001).