板材尺寸設計及伺服沖壓曲線類型對於圓杯引伸成形性能之影響

本研究探討了板材尺寸和沖壓運動曲線對圓杯引伸成形品質的影響，並著重於先進伺服沖壓製程的應用。首先，評估了板材直徑的影響，結果表明，在15 mm的引伸深度下，60 mm直徑的板材可提供最佳成形效果，起皺最小且無破裂。進一步地實驗結果指出，將板材厚度從0.8 mm增加到1.0 mm可顯著減少法蘭區域起皺，尤其是在成形速度為2、4和8（SPM）時。隨後，在相同的材料條件下，比較了三種沖壓運動曲線（傳統曲柄運動曲線、伺服振盪曲線和連桿持壓運動曲線）。結果表明，連桿持壓運動曲線產生的變薄量最大，其次是伺服振盪曲線和曲柄運動曲線。儘管伺服技術具有節能和減少回彈等顯著優勢，但不合適的模具設計參數可能會阻礙材料流動並導致變薄量增加。本研究強調了適當的板材設計和伺服曲線控制策略對於引伸成形性和產品品質的重要性。

This study investigates the influence of sheet dimensions and stamping motion profiles on the forming quality of round cup deep drawing, with a focus on applications in advanced servo stamping processes. Initially, the effect of sheet diameter was assessed, showing that a 60 mm diameter provided the best forming outcome with minimal wrinkling and no fractures under a 15 mm drawing depth. Further analysis revealed that increasing sheet thickness from 0.8 mm to 1.0 mm significantly reduced flange wrinkling, particularly at forming speeds between 2 and 8 strokes per minute (SPM). Subsequently, three stamping motion profiles—conventional crank motion, servo oscillation curve, and link motion with dwell—were compared under consistent material conditions. Results demonstrated that the link motion with dwell produced the most thinning, followed by the servo oscillation and crank motion. Although servo technology offers clear benefits such as energy savings and reduced springback, improper die design parameters may hinder material flow and lead to increased thinning. The study highlights the importance of integrating proper sheet design and servo control strategies to optimize formability and product quality in deep drawing operations.