20 bar super quench vacuum furnace

摘要

A vacuum furnace for heat treating and rapid gas quenching insitu a work piece at pressures up to 20 Bar and high gas velocities. The furnace comprises a single chamber having an inner portion including a plurality of graphite heating elements and graphite insulation, an outer portion and an access door. Further included are movable radiation baffle doors. In their closed position hot gases heat treat the work piece. In their open position the hot gases escape through the opening created onto chevron-shaped baffles in the outer portion which reflect radiation heat energy back into the inner portion and diffuse only convective heat energy into a heat exchanger and a variable speed drive recirculating fan. The recirculating fan directs the cooling gases through cooling nozzles onto the work piece to quench it to a pre-programmed temperature.

主权项

1. A vacuum furnace operating in excess of 10 Bar pressure for heat treating and rapid gas quenching a work piece in the same furnace comprising a single chamber and access means, said chamber being segregated into an outer portion and an inner portion, said inner portion of said chamber being a hot zone and being adapted to receive the work piece to be heat treated through said access means, the furnace further comprising movable door means in said chamber outer portion in the form of movable doors formed to be closed during the heat treating cycle and opened during a quenching cycle, the furnace chamber outer portion further comprising heat exchanger means, blower means and baffle means in the form of a chevron configuration formed to deflect the radiant energy of the hot zone passing into said outer portion of said chamber through an opening created by said movable doors being in the open position back through the opening into said inner portion hot zone of said chamber, and wherein said chevron configuration baffle means is further formed to diffuse the convective heat energy of the hot gases passing through said opening and to distribute said convective heat energy evenly over the full surface area of said heat exchanger means during the quenching cycle, said chevron configuration baffle means being located in said outer portion of said chamber juxtaposed from said movable doors, and wherein said heat exchanger means being located in proximity to said chevron configuration baffle means and said blower means, and said blower means being located in proximity to said heat exchanger means for circulating gases into said inner portion hot zone of said chamber to quench the work piece.