Browse Publications Technical Papers 2018-01-0800
2018-04-03

Effects of Punch Shapes and Cutting Configurations on the Dimensional Accuracy of Punched Holes on an AHSS Sheet 2018-01-0800

Dimensional accuracy of punched hole is an essential consideration for high-quality sheet metal forming. An out-of-shape hole can give rise to manufacturing issues in the subsequent production processes thus inducing quality defects on a vehicle body. To understand the effects of punch shapes and cutting configurations on punched hole diameter deviations, a systematical experimental study was conducted for multiple types of AHSS (DP1180, DP980, DP590) and one mild steel. Flat, conical and rooftop punches were tested respectively with three cutting clearances on each material. The measurement results indicated different diameter enlargement modes based on the punch profiles, and dimensional discrepancies were found to be more significant with the stronger materials and higher cutting clearance. To uncover the mechanism of punched hole enlargement, a series of finite element simulations were established for numerical investigation. The diameter change is mainly owing to the spring-back for the additional material deformation induced by punch tip. Its consequent benefits for tool protection from punching induced enlargement will be also discussed.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Effect of E-Modulus Variation on Springbackand a Practical Solution

2018-01-0630

View Details

JOURNAL ARTICLE

The Influence of the Through-Thickness Strain Gradients on the Fracture Characterization of Advanced High-Strength Steels

2018-01-0627

View Details

TECHNICAL PAPER

Failure Prediction of Boron Steels in Crash

2007-01-0989

View Details

X