초록 ▼

An industrial furnace for heat-treating metallic workpieces has separate heating and cooling chambers. The latter uses a circulating cooling gas, the flow of which against or past the workpieces produces cooling or gas-quenching. The furnace may have another chamber for oil-quenching lying below the

An industrial furnace for heat-treating metallic workpieces has separate heating and cooling chambers. The latter uses a circulating cooling gas, the flow of which against or past the workpieces produces cooling or gas-quenching. The furnace may have another chamber for oil-quenching lying below the gas-cooling chamber. In order to enable the gas cooling to operate quickly and efficiently, a cooling box fed with air by ventilator fans is provided in the shape of a tunnel, with internal surfaces above and at both sides of the effective cooling space constituted by interchangeable nozzle plates (or blank plates if no nozzle openings are desired at the top or at the sides). The workpieces to be cooled rest on a platform which may be raised or lowered to adjust the distance from the top nozzle plate or lowered into an oil bath. The nozzle plates provide a choice of nozzle patterns for different articles or groups of articles to be cooled after heat treatment. The nozzle plates may have setbacks or protrusions in order to vary the spacing of the nozzle openings from the median plane of the cooling tunnel.

대표청구항 ▼

Industrial vacuum furnace for heat treatment of metallic workpiece having separate chambers at least including a chamber for heating said workpieces and a cooling chamber for utilizing a circulating gas to quench or cool or to quench and cool said workpieces, said furnace also having means for prope

Industrial vacuum furnace for heat treatment of metallic workpiece having separate chambers at least including a chamber for heating said workpieces and a cooling chamber for utilizing a circulating gas to quench or cool or to quench and cool said workpieces, said furnace also having means for propelling said gas in circulation and for extracting heat from said gas in heat-exchanger equipment, said furnace having jet outlets for said gas in said cooling chamber constituted by nozzle orifices on interchangeable nozzle orifice plates in said cooling chamber (3): a nozzle box (10) of tunnel-shaped configuration having, or the inside of said tunnel configuration, guides for installing said nozzle orifice plates in a manner closing off said nozzle box for discharging said gas towards a furnace charge (11a) in said cooling chamber on a plurlaity of sides of said furnace charge, said nozzle orifice plates being thereby capable of disposition so as to at least partly envelop said furnace charge with a cooling gas flow discharge suited for cooling said furnace charge by gas entering said cooling chamber in different directions.