초록 ▼

The invention concerns a method for manufacturing quenched metal hollow casings of steel by blow-moulding whereby a preheated hollow casing billet, preferably above austenitising temperature, is introduced into a blow-moulding tool (1) and moulded by being expanded against the inner walls of the too

The invention concerns a method for manufacturing quenched metal hollow casings of steel by blow-moulding whereby a preheated hollow casing billet, preferably above austenitising temperature, is introduced into a blow-moulding tool (1) and moulded by being expanded against the inner walls of the tool by the introduction of a preheated, pressurized medium into the interior cavity of the hollow casing, whereby the moulded hollow casing (6) is rapidly cooled in a process adapted to obtain quenching of the steel material by the dominating heated medium in the hollow casing being replaced by a pressurized cooling medium and that a cooling medium is led through the moulding tool to achieve its cooling.

대표청구항 ▼

[ What is claimed is:] [1.]1. 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)

[ What is claimed is:] [1.]1. 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.