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Numerical Investigation of Optimal Rooftop Punch Shape for Force Reduction and Dimensional Accuracy Control
Technical Paper
2019-01-1091
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The 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.
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Citation
Jia, H., Pu, C., Burton, J., Zhu, F. et al., "Numerical Investigation of Optimal Rooftop Punch Shape for Force Reduction and Dimensional Accuracy Control," SAE Technical Paper 2019-01-1091, 2019, https://doi.org/10.4271/2019-01-1091.Also In
References
- Pu , C. and Gao , Y. Crystal Plasticity Analysis of Stress Partitioning Mechanisms and Their Microstructural Dependence in Advanced Steels J. Appl. Mech. 82 3 031003 2015 10.1115/1.4029552
- Karjalainen , J.A. , Mäntyjärvi , K. , and Juuso , M. Punching Force Reduction with Wave-Formed Tools Key Eng. Mater. 344 209 216 2007 10.4028/www.scientific.net/KEM.344.209
- Shih , H.-C. , Zhou , D. , and Konopinski , B. Effects of Punch Configuration on the AHSS Edge Stretchability SAE Int. J. Engines 10 2017 2051 2056
- Pu , C. , Zhou , D. , Makrygiannis , P. , Wu , W. et al. A Comprehensive Study of Hole Punching Force for AHSS SAE Technical Paper 2018-01-0802 2018 10.4271/2018-01-0802
- Pu , C. , Jia , Y. , Zhou , D. , Makrygiannis , P. et al. Effects of Punch Shapes and Cutting Configurations on the Dimensional Accuracy of Punched Holes on an AHSS Sheet SAE Technical Paper 2018-01-0800 2018 10.4271/2018-01-0800
- Mackensen , A. , Golle , M. , Golle , R. , and Hoffmann , H. Force Reduction during Blanking Operations of AHSS Sheet Materials CIRP Ann. - Manuf. Technol. 59 1 283 286 2010 10.1007/978-3-662-46312-3_32
- Kalpakjian , S. and Schmid , S.R. Manufacturing Engineering and Technology Upper Saddle River, NJ Pearson 2014 0133128741
- Kadarno , P. , Mori , K.-I. , Abe , Y. , and Abe , T. Punching Process Including Thickening of Hole Edge for Improvement of Fatigue Strength of Ultra-High Strength Steel Sheet Manuf. Rev. 1 4 2014 10.1051/mfreview/2014003
- Subramonian , S. , Altan , T. , Ciocirlan , B. , and Campbell , C. Optimum Selection of Variable Punch-Die Clearance to Improve Tool Life in Blanking Non-Symmetric Shapes Int. J. Mach. Tools Manuf. 75 63 71 2013 10.1016/j.ijmachtools.2013.09.004
- Wang , K. , Greve , L. , and Wierzbicki , T. FE Simulation of Edge Fracture Considering Pre-Damage from Blanking Process Int. J. Solids Struct. 71 206 218 2015 10.1016/j.ijsolstr.2015.06.023
- Sartkulvanich , P. , Kroenauer , B. , Golle , R. , Konieczny , A. , and Altan , T. Finite Element Analysis of the Effect of Blanked Edge Quality upon Stretch Flanging of AHSS CIRP Ann. - Manuf. Technol. 59 1 279 282 2010 10.1016/j.cirp.2010.03.108
- Jia , Y. and Bai , Y. Ductile Fracture Prediction for Metal Sheets Using All-Strain-Based Anisotropic eMMC Model Int. J. Mech. Sci. 115-116 516 531 2016 10.1016/j.ijmecsci.2016.07.022
- Kutuniva , K. , Karjalainen , J.A. , and Mäntyjärvi , K. Effect of Convex Sheared Punch Geometry on Cutting Force of Ultra-High-Strength Steel Key Eng. Mater. 504-506 1359 1364 2012 10.4028/www.scientific.net/KEM.504-506.1359
- Jia , Y. , Wang , Y. , and Bai , Y. A New Combined Isotropic, Kinematic and Cross Hardening Model for Advanced High Strength Steel under Non-Linear Strain Loading Path SAE Int. J. Engines 10 2 382 390 2017 10.4271/2017-01-0367
- Jia , Y. and Bai , Y. Experimental Study on the Mechanical Properties of AZ31B-H24 Magnesium Alloy Sheets under Various Loading Conditions Int. J. Fract. 197 1 25 48 2016