摘要
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。
For the stamping parts with high precision and multi-row holes, a new stepping piercing die with self-drive structure was designed in- cluding the wedge of upper die, the driven mechanism, synchronization mechanism and anti-warpage mechanism of lower die plate, and the floating roller mechanism of upper and lower die. Then, the structure of helical teeth around the sheet metal was designed and optimized, the distribution of multi-row holes was analyzed, and the technological scheme of stepping piercing was put forward. The results show that the slider in the driven mechanism is pushed forward by the wedge of upper die initially, and then the helical teeth around the sheet metal are pulled by the push rod with tooth profile in the slide, finally the multi-row holes with equal line spacing can be processed by stepping piercing under the combined action of synchronous mechanism, anti-warpage mechanism and floating roller mechanism. The optimization angles of addendum and tooth root are beth 60°. Thus, the floating roller mechanism of upper and lower dies drives the sheet metals to roll between upper roller and lower roller, which changes the sliding friction into rolling friction and greatly reduces the scratch defects on the surface of parts.
出处
《锻压技术》
CAS
CSCD
北大核心
2017年第10期127-131,共5页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51405249)
宁波市自然科学基金资助项目(2015A610103)
关键词
冲孔模
多排孔
斜齿
跳步冲孔
驱动机构
同步机构
防翘机构
浮动滚轮机构
piercing die
multi-row holes
helical teeth
stepping piecing
driven mechanism
synchronization mechanism
anti-warpage mechanism
floating roller mechanism
