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.
Effects of Punch Shapes and Cutting Configurations on the Dimensional Accuracy of Punched Holes on an AHSS Sheet
Sae Technical Papers
WCX World Congress Experience ; 2018
2018-04-03
Aufsatz (Konferenz)
Englisch
Effects of Punch Configuration on the AHSS Edge Stretchability
SAE Technical Papers | 2017
|AHSS Application in Roof Strength
SAE Technical Papers | 2007
|AHSS Application in Roof Strength
British Library Conference Proceedings | 2007
|AHSS application in roof strength
Kraftfahrwesen | 2007
|Servo gun controls for AHSS steels
Tema Archiv | 2006
|