The Effect of Friction Coefficient to the Strain Edge with Rectangular Box

Abstract

Now days, to designing products in deep drawing technology are more complicate especially, to design of the unwanted of draw bead on work-piece. So, the new techniques are requiring designing for decrease draw bead. Therefore, this research aims to study the ratio of friction coefficient between the strain edge and corner of rectangular box deep drawing process by using standard JIS SPCC cold roll steel material, 0.5 mm of thickness. Friction coefficient in box corner were used; 0.57, .061, 0.067, 0.073, and 0.080 respectively, and friction coefficient in staring edge fixed to 0.16 with 100 x 120 x 50 mm of box sized, with lubricant oil, deep drawing velocity 35 mm/sec. The results from simulation and experiment found that the form ability increase when the friction coefficient decrease meanwhile, when the friction coefficient ratio increase the efficiency of rectangular box deep drawing increase too. However, as the punch and die radius decrease results to increase the strain on bottom corner of box and deep drawing force increase. To reduce the friction coefficient in bottom corner of box was increase the deep drawing efficiency. That is to say, the finite element simulation can prediction of the deep drawing box to reduce cost in design and manufacturing tools and forming ability conditions for use these available in rectangular box deep drawing process.