Numerical Investigation of Optimal Rooftop Punch Shape for Force Reduction and Dimensional Accuracy Control AK Steel Corporation

Format:

Book

Conference/Event

Author/Creator:

Jia, Jia, author.

Contributor:

Burton, Jason

Pu, Chao

Wang, Youwei

Zhu, Feng

Conference Name:

WCX SAE World Congress Experience (2019-04-09 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2019

Summary:

AbstractThe rooftop punch is proposed to reduce the maximum cutting force during the trimming operation for advanced high strength steels (AHSS), by introducing a shearing angle at the tool edge. However, such non-simultaneous shearing mechanism results in the inconsistent deformation around the hole perimeter, and consequently affects the dimensional accuracy of the trimmed hole. A numerical study was conducted to investigate the effects of punch tipping angle and tipping heights on the force reduction and dimensional discrepancies. The 60mm hole punching operation for DP 1180 (1.2mm) material was simulated with finite element analysis. The tipping height was reduced by introducing flat portions to the rooftop punch and it can mitigate the material deformation difference before trimming. The results showed tipping height played a significant role of dimensional accuracy control by adopting small tipping angle and broad flat portions. However, such geometric combination could increase the maximum shearing load at the same time. Additionally, a concave rooftop punch shape was also evaluated to compare with the conventional convex rooftop punch

Notes:

Vendor supplied data

Publisher Number:

2019-01-1091

Access Restriction:

Restricted for use by site license