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针对高精度多排孔冲压件,设计了一种新型模内自驱动跳步冲孔模,该模具结构包含:上模的楔块,下模凹模板的驱动机构、同步机构及防翘机构,上模和下模的浮动滚轮机构。设计及优化了板材周边斜齿结构,分析了多排孔分布规律,提出了跳步冲孔的工艺方案。结果表明:上模楔块推动驱动机构的滑块,滑块内的齿形推杆推动事先冲好的板材周边斜齿,在同步机构、防翘机构和浮动滚轮机构共同作用下,实现了等间距跳步冲孔;斜齿的齿顶角和齿根角的优化值均为60°;上、下模的浮动滚轮机构迫使板材在上滚轮和下滚轮之间滚动,将滑动摩擦变为滚动摩擦,极大地减少了零件表面的划痕缺陷。
Aiming at high-precision multi-row hole punching parts, a new type of self-driven jump punch die is designed. The die structure includes the wedge of the upper die, the driving mechanism of the die of the lower die, the synchronization mechanism and the anti-warpage mechanism, Upper and lower die floating roller mechanism. The helical tooth structure around the plate was designed and optimized, the distribution rule of multi-row holes was analyzed, and the technological scheme of perforation was given. The results show that the upper wedge drives the slider of the driving mechanism and the toothed pushrod in the slider pushes the helical tooth of the sheet which is punched well in advance. Under the cooperation of the synchronous mechanism, the anti-curling mechanism and the floating roller mechanism, Pitch hopping pitch; helical tooth top angle and tooth root angle optimization values are 60 °; upper and lower die floating roller mechanism to force the plate rolling between the upper and lower roller, the sliding friction into rolling friction , Greatly reducing the scratches on the part surface defects.