Influence of Die Clearance and Punch Velocity on The Quality of The Rubber Cutting Edge in The Blanking Process

Abstract

The objective of this research is to study the influence of die clearance and punch velocity on the quality of the rubber cutting edge in the blanking process. The specimens studied were saline hose joints made of polyisoprene rubber material by compression molding process with 144 cavities. Each cavity was linked by flash with an average thickness of 1 millimeter. The experiment was conducted on a die designed and built according to the metal die principle with die clearance values of 0.01 and 0.05 millimeter. The studied process parameter was the punch velocity, which was set at 314 and 1257 millimeter/second. The results showed that the principle of a blanking die can be applied to the design of a polyisoprene rubber cutting die. The cutting edge of the workpiece has a quality that meets the quality criteria of the establishment. The quality of the cutting edge of the finished workpiece depends on the die clearance size and the punch velocity during cutting. The quality of the cutting edge can be improved by designing the die with less die clearance and increasing the punching speed of the workpiece.