摘要:
A plasma arc remelting furnace system with improved components including mechanisms for independently vertically feeding and oscillating the metal blank through the top of the furnace. Multiple plasma arc torches (plasmatrons) are installed in a sealed chamber and adjustable operators enable angular disposition of individual torches. The torches have improved torch nozzles with heat sink construction enabling operation at higher temperatures, better stabilized plasma arcs and longer torch life. The system can utilize ingot molds of various cross section shapes, i.e., round, square, rectangular and polygonal and, depending upon mold shape, the number of torches can differ. Operating circuits are provided for use with a plurality of different numbers (up to eight) of torches, either with direct current or alternating current power sources, and possible variations of circuits will enable using a larger number of torches.
摘要:
A method for plasma-arc remelting of a material under a controlled atmosphere consists in making the material to be remelted in the form of a consumable hollow electrode-bar and electrically melting down the hollow electrode-bar so formed, in a cooled mold before finally stripping the remelted ingot off the mold. The method also includes generating a low temperature plasma at a tip of the consumable electrode which is connected to a power source, by supplying plasma-generating gas into an arcregion, through the hollow of the consumable electrode bar. Stabilizing the plasma-arc during operation without giving rise to transient arc plasma is expediently achieved by feeding preselected amounts of flux into the arc-region, thereby producing an ingot free from flaws and impurities.
摘要:
A method for the plasma-arc remelting of a consumable metal bar into ingots under controlled atmospheric conditions in which remelting is effected through the use of plastmatrons which serve for heating nitrogen gas to the plasma-state and feeding it together with activated metal for its remelting and alloying, and whereby an ingot is preformed in a cooled mould which is coupled to a power source.
摘要:
A device for extracting ingots from molds of plasma-arc furnaces in which a dummy bar is secured on at least two rods located symmetrically relative to a center of its cross-section.
摘要:
A plasma-arc furnace for remelting of sheet-waste material of high reactivity metals and their alloys has a furnace chamber containing a mould, plasmatrons mounted on a roof of the chamber, and a charging device for feeding sheet-waste material into a melting zone. The charging device has a hopper arranged to contain the sheet-waste material, a water-cooled base plate, guide troughs along which the sheet-waste material is fed, and controlling means to control the feed of the sheet-waste into the melting zone. The furnace expediently employs a stripping and conveying gear to deliver remelted sheet-waste material in any desired form such as a bar or a slab.
摘要:
A plasmatron drive wherein the plasmatron is combined with the pneumatic drive rod into an integral unit and the pneumatic drive cylinder is provided with a mechanism for fixing the plasmatron in the upper position.