Criterions for Predicting Skid Line Marks by Simulation

Paper #:
  • 2017-01-0300

Published:
  • 2017-03-28
Abstract:
The risk of skid line marks for Class A panel has to be assessed before releasing the die development for hard tooling. A criterion is needed to predict skid line in formability evaluation process. In this study, a standard strip draw test procedure was developed to generate skid mark on lab samples for the physical evaluation using tooling with various die entry radii and different draw beads. The skid line severity of the lab samples was rated by specialist inspecting automotive outer panel surface quality. The skid line rating was correlated with geometric measurements of the lab sample after strip drawn. The sensitivity for appearance of skid line to tooling and process parameter variation was identified. Finite element simulation was conducted to correlate with test measurement to understand the reason of skid line mark and discover the critical conditions to have visible skid line. Results for strain variables were post processed and correlated with the skid line rating. A strain gradient based criterion to define the limit for a visible skid line was developed and implemented in a hood stamping simulation. The area with observed skid line mark concern was predicted with simulation using the developed criterion.
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