基于滑移线场的闭挤式精冲主冲力计算及实验验证

目的研究基于滑移线场的闭挤式精冲主冲力计算,为后续的仿真模拟提供理论基础。方法根据闭挤式精冲的成形特点,建立闭挤式精冲坯料变形区的力学模型,通过处理刚塑性体平面应变问题的方法,利用滑移线理论建立闭挤式精冲的滑移线场,通过该滑移线场的建立计算冲裁过程中的主冲裁力。结果滑移线法计算出的结果,并通过精冲实验进行了验证,实验得到冲裁力的大小与滑移线法所计算出的冲裁力相差0.8%,经过分析,认为误差的存在主要由摩擦力的忽略及材料被视为刚塑性材料所致。结论滑移线法计算冲裁力是比较适用的,为闭挤式精冲的工艺参数提供了较为精确的计算方法。

Main Blanking Force Calculation and Experimental Verification of Closed-Extruding Fine Blanking based on Slip Line Field

The paper aims to research the main closed extruding fine blanking force of the slip line field and provide a theoretical basis for follow up analogue simulation. A mechanical model for the transformation area of closed-extruding fine blanking was established according to its forming features. The slip line theory was utilized to establish the slip line field of closed extruding fine blanking by using plane strain theory of rigid-plastic material to calculate the main blanking force in the blanking process. The result calculated by the slip line method was verified through a fine blanking experiment. The blanking force obtained in the experiment was varied by 0.8% compared with the calculated result. After analysis, it was believed that the error was caused mainly by ignorance of friction and that the material being regarded as rigid-plastic material. The slip line method is appropriate to calculate blanking force; it provides an accurate calculation method for the process parameters of closed-extruding fine blanking.