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Criteria for Predicting Skid Line by Simulation
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The risk of skid lines for Class A panels has to be assessed before releasing the die development for hard tooling. Criteria are needed to predict skid lines in the formability evaluation stage to avoid expensive changes to tooling and process for resolving skid line issue in production. In this study, criteria using three different measured parameters were developed and validated. A draw-stretch-draw (DSD) test procedure was developed to generate skid lines on lab samples for the physical evaluation. This was done using tooling with various die entry radii and different draw beads. The skid line severity of lab samples was rated by specialists in the inspection of automotive outer panel surface quality. The skid line rating was correlated with geometric measurements of the lab samples after the DSD test. The sensitivity of the appearance of skid lines to tooling and process parameter variations was identified. Finite element simulation was conducted to correlate with test measurements, to understand the reason of skid lines and discover the critical conditions to have visible skid lines. By correlating variables obtained in post processing to skid line rating, criteria based on both thickness and strain were developed to define the limit for a visible skid line. This was then implemented in a stamping simulation of a hood outer. The areas on the hood where skid lines were observed were predicted with the simulation using the developed criteria. More simulation implementation, industrial evaluation and validation may help to improve the accuracy of the criteria.
CitationYao, H., Sadagopan, S., Kuo, M., Huang, L. et al., "Criteria for Predicting Skid Line by Simulation," SAE Technical Paper 2017-01-0300, 2017, https://doi.org/10.4271/2017-01-0300.
Data Sets - Support Documents
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- Li Xue , Cheng Ying-chao , Liu Gang , Jiang Gu-ming Sheet metal stamping analysis of automobile side-panel Forging & Stamping Technology 2011 03
- Smith L. M. , Chatchai Wanintradul , Gurumurthy Gopinath T. , Changqing Du , Lumin Geng , Zhou D. J. , Ching-Kuo Hsiung , Jizhou Chen and Ming Chen Design of Skid Line Simulation Machine for Sheet Metal Surface Quality Analysis Final report to USAMP and A/SP 2009
- Chatchai Wanintradul , Gurumurthy Gopinath T. , Smith L. M. , Changqing Du , Lumin Geng , Zhou D. J. , Ching-Kuo Hsiung , Jizhou Chen and Chao Feng An Experimental Analysis Device for Obtaining Skid Line Limit Diagrams AIP Conf. Proc. 1383 557 2011
- DYNAFORM/ETA Post Processing 1.8.0 manual