Ali Abedi - MSC Graduated, Shahid Rajayi Institute
Bozarjomehr Ghasemi - Associate Prof. of Islamic Azad University Najafabad Branch
- Moradi - Assistant Prof. of Isfahan University of Technology

A new method for increasing LDR in deep drawing is application of anti-lock braking system (ABS) on blank holder. In this method, instead of applying a constant force on blank and control the metal flow, the ABS system holds and releases the blank several times (۲۰ to ۵۰ times) which results increasing LDR. This study investigates the effect of different parameters of ABS on improving the conditions of drawing and increasing LDR The results of steel sheet (ST۱۴) with ۰.۵ mm thickness shows that for each velocity of punch there is an optimum frequency for ABS.The best condition for applying force of blank holder is create a constant gap and a variable gap with ABS system.

Deep drawing, Limiting Drawing Ratio, Anti lock Braking System