Solving Slug Pulling Problem Using High-Pressure Air Generated by a Compression Unit Installed Inside a Die Set

A press die has a reciprocating motion with the movement of the press machine. There is a very strong force between the upper and lower die. Utilizing the reciprocating motion, the author’s laboratory developed a high-pressure air compression unit, which can be fixed inside a die set. The generated powerful air can successfully blow slugs that occur in punching from the die. Moreover, it can be used as an independent power source to perform auxiliary motions, such as material sheet feeding or second working on the products, during the pressing process. This study describes the development of the air compression unit; the experiment carried out to test slug removal; and provides the related reference data to promote the further deployment and application of this technology.