| 摘要 |
PURPOSE:To enable the inexpensive and sure maintenance of a non-oxidative atmosphere in an installation for producing a thin metallic sheet by housing said installation in a hermetic chamber provided with an air substituting device and adjusting the inside of the chamber substantially to the non-oxidizing atmosphere in the stage of starting melting a metallic material. CONSTITUTION:An installation for producing a thin metallic sheet consisting of a furnace body supporting frame 2 for supporting a furnace body 4, a cooling roll 6 provided on a base 1, a take-up drum 10, etc. is housed in a hermetic space 28 formed of a hermetic tank 20 and a cover 22. A water-sealed evacuating pump 31, an inert gas bomb 34 and a high frequency power source, power supply control device, a controller for the pressure in the furnace (not shown in the figure), etc. are installed on the outside of said tank 20. The air in the space 28 is evacuated by the pump 31 before the melting of the metal 40 in said body 4 by a high frequency coil 3 is started and at the same time an inert gas is introduced into the space from the bomb 34 to substitute the air with said gas thereby adjusting the atmosphere thereof to the substantially non- oxidative atmosphere contg. oxygen at <=1%, practically a lower limit of 0.2 concn. The metal 40 is thereafter melted and is ejected onto the roll 6, by which a thin metallic sheet 41 is produced. |
