杨程,彭迎娇,陈林,等.冲头刃口形状对冲裁的影响研究[J].精密成形工程,2023,15(5):63-70.
YANG Cheng,PENG Ying-jiao,CHEN Lin,et al.Effect of Punch Edge Shape on Blanking[J].Journal of Netshape Forming Engineering,2023,15(5):63-70. |
| 冲头刃口形状对冲裁的影响研究 |
| Effect of Punch Edge Shape on Blanking |
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| DOI：10.3969/j.issn.1674-6457.2023.05.008 |
| 中文关键词: 冲裁 刃口形状 数值模拟 拉伸变形 模具磨损 |
| 英文关键词: blanking blade shape numerical simulation stretch deformation die wear |
| 基金项目:国家自然科学基金(51874226);西安市科技局科技创新引导项目(201805033YD11CG17(10)) |
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| 中文摘要: |
| 目的 研究不同冲头刃口形状对冲裁变形过程和冲头磨损情况的影响。方法 采用有限元方法和实验分析了相同工况下平冲头、台阶状冲头和屋顶状冲头对坯料冲断行为的影响，以及不同刃口形状的冲头在冲裁后的磨损情况。结果 冲头结构的改变使冲裁过程发生了变化，影响了冲裁时坯料内部的应力–应变分布、峰值冲裁力、裂纹扩展速度、弹性应变能和冲头单次磨损深度。屋顶状冲头在冲裁时峰值冲裁力最低，较平冲头与台阶状冲头的峰值冲裁力分别降低了15%、10%，坯料最早起裂，也最快完成断裂，坯料的高应力区域集中在凹模刃口，且该冲头冲裁时坯料内储存的弹性应变能最多，冲头工作区的单次磨损深度最小，较平冲头与台阶状冲头的单次磨损深度分别降低了84%、80%。结论 屋顶状冲头使坯料在断裂前发生了更大的拉伸变形，储存了更多的弹性应变能，坯料在拉伸状态下发生了剪切变形，冲裁力更小，高应力分布的改变降低了冲裁时坯料对冲头侧面的压力，冲断后的坯料发生弹性恢复，可防止冲头回程时坯料抱紧冲头造成的二次磨损。 |
| 英文摘要: |
| The work aims to study the effect of different punch edge shapes on blanking deformation and punch wear. The effect of flat punch, step punch and roof punch on the blanking behavior under the same blanking conditions was analyzed based on finite element analysis and experiment. The results showed that the change of punch structure changed the blanking process and affected the stress and strain distribution in the blank, the peak blanking force, the crack generation speed, the elastic strain energy and the single wear depth of the punch during blanking. The roof punch had the lowest peak blanking force, which was 15% and 10% lower than that of the flat punch and the step punch respectively. And also, it was the earliest to have crack initiation and complete the fracture. Meanwhile, the high stress area of the blank concentrated on the edge of the concave die, and the elastic strain energy stored in the blank during punching was the largest, and the single wear depth in the working area of the punch was the smallest, which was 84% and 80% lower than that of the flat and step punches respectively. The roof punch makes the blank undergo greater tensile deformation before fracture and store more elastic strain energy. The blank undergoes shear deformation in the tensile state. The blanking force is smaller. The change of the high stress distribution reduces the pressure of the blank on the punch side during blanking. The broken blank undergoes elastic recovery, which can prevent the secondary wear caused by the blank holding the punch during the punch return. |
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