研究生: |
洪坤宏 Kun-Hung Hung |
---|---|
論文名稱: |
由應力分析探討微鑽頭之最佳幾何設計及其鑽削球格陣列(BGA)基板之磨耗分析研究 Research on the optimal geometric design of a microdrill based on stress analysis and the flank wear for drilling BGA substrate.drilling BGA substrate |
指導教授: |
修芳仲
Fang-Jung Shiou |
口試委員: |
林清安
Ching-an Lin 范光照 Kuang-Chao Fan |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 115 |
中文關鍵詞: | Pro/Mechanica 、BGA 、微鑽頭 、刀腹磨耗 、最佳鑽削參數 |
外文關鍵詞: | Pro/Mechanica, BGA substrate, microdrill, flank wear, optimal drilling parameters |
相關次數: | 點閱:221 下載:1 |
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本研究的目為利用Pro/Mechanica 分析軟體進行微鑽頭幾何設計最佳化,再利用田口法找出微鑽頭鑽削球格陣列(BGA)基板之最佳加工參數。
微鑽頭幾何設計最佳化是對微鑽頭之鑽頂角、第一角、第二角、螺旋角、心厚、心厚錐度與鑽背等七個幾何特徵進行Pro/Mechanica 應力/位移分析,且由靈敏度分析找出五個主要影響參數,分別為鑽頂角、第一角、第二角、螺旋角與心厚,再進行最佳化分析,以得到微鑽頭所承受之應力/位移為最小值之最佳幾何參數,其所得之尺寸分別為120˚、10˚、28˚、45˚及0.049 mm,接者進行實際鑽削驗證並確認其壽命確實較原設計多出3%。
經幾何特徵最佳化後之微鑽頭再進行田口實驗法,針對主軸轉速、進給量及迴刀速度等三個實驗參數,探討微鑽頭鑽削BGA基板後所得之最佳鑽削參數,並分析所產生之微鑽頭刀腹磨耗情況,同時利用非接觸式影像量測儀分析板材之孔位精度與孔徑大小。由實驗結果可以得到刀腹磨耗面積最小之最佳鑽削參數為:主軸轉速200,000 rpm、進給量11 μm/rev、迴刀速度17.5 m/min。經由量測結果可得知,以刀腹磨耗面積最佳參數進行GBA基板鑽削於5000孔內,孔壁粗糙度與毛邊大小都可以符合規範。另外,本研究也探討微鑽頭在刀腹磨耗面積為最小之最佳鑽削參數情況下,鑽削GBA基板至8000孔其刀腹磨耗壽命曲線。
The objective of this research is to determine the optimal geometric design of a microdrill with the diameter of 0.11 mm with the help of Pro/Mechanica analysis, and to find out the optimal parameters for drilling the BGA substrate by Taguchi’s experimental method.
The optimal geometric design of a microdrill was investigated by Pro/Mechanica software on stress/displacement analysis with respect to seven geometry characteristics, namely point angle, primary face angle, secondary face angle, helix angle, web thickness, web taper, and land width. Five mainly dominant parameters, namely point angle, primary face angle, secondary face angle, helix angle, and web thickness, were found out through the sensitivity analysis. The optimal geometric dominant parameters of a microdrill were then determined by carrying out the optimal analysis so that the stress/displacement of the microdrill was minimum. The optimal geometric dominant parameters are as follows: point angle of 120°, primary face angle of 10°, secondary face angle of 28°, helix angle of 45°, and web thickness of 0.049 mm, respectively. Based on the verification of the drilling test, the total hits of the microdrill fabricated with the optimal geometric parameters determined by this study was 3% more than that the microdrill fabricated with the original geometric parameters determined by the Taguchi’s method.
Three drilling parameters, namely spindle speed, feed, retraction rate were configured in the Taguchi’s matrix experiments. Three sets of the optimal drilling parameters with respect to the optimal flank wear area, deviation of hole position, and the accuracy of the hole diameter, respectively, were obtained based on the experimental results. The optimal drilling parameters for the flank wear area are the combination of speed 200.000 rpm, feed 11 μm/rev, retraction rate 17.5 mm/min. Based on the experimental results, the surface roughness on the hole wall of the copper sheet could meet the standard requirements if the number of hits under 5000 hits using the optimal drilling parameters for the flank wear .The drill flank wear curve for the tested microdrills using the optimal drilling parameters was also obtained according to the experimental results.
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