The Study Trimming Process of High Strength Steel SPFC440 steel

Abstract

Cutting edge of the trimming process is particularly important in the production of sheet metal. Generally, the trimming process with high strength steel SPFC440 has narrow shear surface and large burr on cutting edge of work piece. The objective of this research is to study the effect of punch angle to quality of workpiece. The materials used in experiments high strength steel grad SPFC440 with thickness 1 mm. The punch and die were made from tool steel grad JIS SKD11. Tool clearance betwean punch and die has far levels 2%,5% and 8% of the work piece thickness. The punch angles 90º, 45º and 30º were used for finding an appropriate condition in this research. The experiment in trimming process that the punch angle can contribute to increase shear surface and decreasing burr on cutting edge of work piece. The parameters of the experiment with punch angles 30º Tool clearance bet wean punch and die has far levels 5% of the work piece thickness an appropriate condition in this research. However, using cutting tools shaped horn will result in faster wear.