精密剪切在沖壓加工中越來越被廣泛應用，其成品精度高、剛性高且不需二次加工，具有諸多優點。然而，在精微尺度下之精密剪切製程，各種參數對材料剪斷面品質影響，尚需深入了解。
本研究探討板厚0.4mm C2600 黃銅之精密剪切製程，以有限元素法模擬剪切行為並配合田口方法分析，其中考慮板厚/晶粒尺寸比、間隙值、反壓力及壓料力等參數對剪斷面的影響。以不同晶粒尺寸薄板進行材料試驗，將所得之塑流應力與臨界破壞值輸入DEFORM 2D 軟體模擬，並比較不同破壞準則的準確性。最後，設計一組模具進行精密剪切實驗，比較實驗與模擬結果。
研究結果顯示，考慮靜液壓力之Ayada 準則，進行精密剪切模擬之準確性較高。由田口分析可知，板厚/晶粒尺寸與壓料力兩種參數對精微精密剪斷面品質影響較大；反壓力對剪斷面品質影響則較小。另外，要得到完整的光亮面，單邊間隙至少要在板厚之2%內。

Fine blanking is widely used in stamping process. Fine blanking products have many advantages, like high precision, high rigidity and secondary process is not needed. However, in micro scale, the investigation of the influence of each parameter of fine blanking process on the shearing surface is still needed.
This thesis studies the fine blanking process of C2600 brass sheet with thickness 0.4mm. The finite element analysis was conducted for the simulation in fine blanking. The influence of different levels of thickness/grain size ratio, clearance, blank holder force and counterpunch force on the shearing surface is evaluated by Taguchi method. The material tests of the sheets with different grain sizes were performed and the flow stresses and critical fracture values were obtained and then were input into DEFORM 2D software to simulate the fine blanking process. The accuracy of
fracture criteria was studied. Finally, fine blanking experiments were carried out, and compared with the results of the simulation.
The results indicate that Ayada criterion, considering hydrostatic pressure, has better prediction for fine blanking simulation of micro sheets. The thickness/grain size ratio and blank holder force have greater effect on
shearing surface quality than the counterpunch force do. In addition, for getting complete burnish surface, the clearance should be least within 2% of the sheet thickness.

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