In the process of deforming, reasonable BHF is subjected to three limit comprising of wrinkling limit in the flange, wrinkling limit in the side wall of the part and fracture limit.
圆锥形零件的冲压成形过程中的合理压边力应由外皱极限(毛坯法兰部分的起皱极限)、内皱极限(悬空部分的起皱)和破裂极限三极限来控制。
参考来源 - 圆锥形零件极限拉深系数及合理压边力的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Based on the prerequisite of no cracking, the fit constant BHF was acquired from reasonable blankholder gap control.
基于不破裂前提，从合理压边间隙控制中获得常压边力控制所需的恒定压边力。
Therefore it is necessary to study forming characteristic of conical part, to analyze various parameters'influence on its forming limit, and to define reasonable blank holding force(BHF).
圆锥形零件是曲面类零件中较为典型的零件，对其冲压成形过程的研究是进行曲面类零件研究的基础。
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