Patent ID: 6261392
Filing Date: 2001-07-17
Classification: B21D,C21D

Abstract:
A process for preparing a quenched hollow casing of steel by blow molding, the process including the steps of(a) preheating a hollow casing billet to a quenching temperature;(b) introducing the hollow casing billet into a blow molding tool having inner molding walls;(c) molding the hollow casing billet by expanding the hollow casing billet against the inner molding walls of the molding tool by injecting a preheated, pressurized medium into an interior cavity of said hollow casing billet; and(d) quenching the hollow casing billet by replacing the preheated, pressurized medium with a pressurized cooling medium, including circulating the pressurized cooling medium through the molding tool and the interior cavity to achieve a rapid cooling effect on said hollow casing billet.