| 摘要 |
PURPOSE:To prevent the formation of cavities of cast rotors and achieve the stabilization of product performance by providing a hole part of extended slit of a layer forming iron core and a notch hole with serration respectively to an upper end connecting ring and pouring molten metal in the hole parts of the lower end connecting ring, slot part and upper end connecting ring. CONSTITUTION:With a layer forming iron core 4 and end connecting ring 8B being held exerted with pressure by way of an upper mold holder 7, high pressure is given to molten metal and a molten metal port gate 2 is operated to inject the molten metal quickly into the end connecting ring 3B of a casting lower mold 3, the slot 4A of the iron core 4 and the hole part 4B of extended slot 4A and expanded notch hole 4C with serration in the end connecting ring 8B fitted to the upper mold 8, thence the pouring port gate 2 is closed. After cooling, the holder 7 is raised and the upper mold 8 is removed. Next, an intermediate ring 6 is pulled, and the iron core 4 having been cast by way of the core metal 5 is pulled up and is taken out, thence the core metal 5 is pulled from the inside diameter of the iron core 4, whereby the Al cast rotor is obtained. Since the flow of the molten metal is one way from below to above, the formation of cavities owing to entry of air is prevented. |
