Vacuum carburizing device for steel, comprises carburizing chamber for material to be processed, vacuum pump, carburizing gas supply for the chamber in stroke operation, return pipe, opening- and closing valves, and control equipment

摘要

The vacuum carburizing device for steel, comprises a carburizing chamber (3) for a material to be processed, a vacuum pump, which sucks gas from the carburizing chamber to obtain a vacuum, a carburizing gas supply (4) for the carburizing chamber in a stroke operation, a return pipe (15), which connects an inlet side and an outlet side of the vacuum pump, opening- and closing valves (16) arranged in the flow of the return pipe, and a control equipment (20), which opens the opening and closing valve, when a supply of carburizing gas into the carburizing chamber is started. The vacuum carburizing device for steel, comprises a carburizing chamber (3) for a material to be processed, a vacuum pump, which sucks gas from the carburizing chamber to obtain a vacuum, a carburizing gas supply (4) for the carburizing chamber in a stroke operation, a return pipe (15), which connects an inlet side and an outlet side of the vacuum pump, opening- and closing valves (16) arranged in the flow of the return pipe, a control equipment (20), which opens the opening and closing valve, when a supply of carburizing gas into the carburizing chamber is started and closes the opening and closing valve when the carburizing gas supply ends, and a flow-quantity control valve (17), which is arranged in the flow of the return pipe and adjusts a quantity of the carburizing gas returned to the inlet side of the vacuum pump. An independent claim is included for a method for carburizing a material to be processed.