CENTRIFUGAL CASTING MACHINE

PURPOSE:To stabilize the thickness of mixed layer formed with the inner layer and the outer layer and to reduce blow holes developed in the inner part by arranging a heater on the outer peripheral part of a molten metal pouring tube inserted into a centrifugal casting mold and heating the inside surface of the outer layer. CONSTITUTION:The tip part of the molten metal pouring tube 15 is inserted to reach to the intermediate part of the centrifugal casting mold 14 from the opening part 13 to pour the molten metal for outer layer 25 from a silo 16. Successively, all of the insert part 15a in the mold of the pouring tube 15 is inserted into the mold 14 and the inside surface for outer layer 25 is heated with the heater 19. The inside temp. of the molten metal for outer layer 25 is measured with an optical fiber 23, etc., led in a nozzle 22. This measured temp. value is compared with the resistered temp. range in a control unit 24 and the output of the heater 19 is controlled so as to hold this range. The outer layer 25 is cooled from the outer part direction of the mold and gradually solidified from the outside. By this method, the suitable timing of the pouring of the molten metal for inner layer is obtd.