Transactions of Materials and Heat Treatment

Title：Design on stepping piercing die with self-drive structure

Authors： Wang Kesheng Han Yu

Unit： Ningbo University of Technology

KeyWords： piercing die multi-row holes helical teeth stepping piecing driven mechanism synchronization mechanism anti-warpage mechanism floating roller mechanism

ClassificationCode：TG386.41

year,vol(issue):pagenumber：2017,42(10):127-131

Abstract：

For the stamping parts with high precision and multi-row holes, a new stepping piercing die with self-drive structure was designed including 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 both 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.

Funds：

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）

作者简介：王可胜（1971-），男，博士，副教授，E-mail：xclwks@126.com

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