Numerical Analysis of the Shape of an Apparatus for Punching Holes in Thin Metal Sheets Using Underwater Shock Waves
Abstract
Punching is known as one of the methods of making holes in metals. In the punching process, multiple holes can be punched simultaneously, and products can be produced continuously. However, there are also problems such as defective holes when the punch gets worn and damaged. If the punching process is continued with a damaged punch, defective products may be produced continuously thereafter. A clearance is provided between the punch and die to prevent damage to the punch, but this clearance causes burrs and sags in the machined holes. Therefore, we propose a punching process that uses shock waves instead of punches. Using this method, the punch will not be damaged, and the production of defective products can be reduced. In addition, the clearance between the punch and the die is eliminated, and the generation of burrs and sagging may be suppressed. In this study, we developed a pressure vessel to perform the punching process using small shock waves from a thin metal wire explosion. Using the pressure vessel we developed to perform the punching process, we succeeded in punching holes in a thin aluminum plate.
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