| 摘要 |
PURPOSE:To prevent formation of blowholes and seizure of dies and to eliminate the need for a post treatment of a gate by specifying the system of a pin gate which communicates with annular recessed space for forming an end ring of a top die of the top and bottom dies having the above-discribed space. CONSTITUTION:A rotor core 11 is attached in such a way that the end part of the slots 12 thereof faces annular recessed spaces 14, 17 for forming end rings of a bottom die 13 and a top die 16, and the dies 13, 16 are combined separably. A runner 18 for supplying a molten metal is disposed inner than the space 17 and both are connected by a pin gate 19 disposed diagonally from the bottom end of the runner 18 toward the inside circumferential surface of the space 17. Then the melt of a conductive material, for example, Al, enters the space 17 through the gate 19 from the runner 18 and flows into the slots 12. Since the molten metal flows zigzag in the slots 12, the generation of die seizure and blowwhole is made difficult. The cutting trace 20 of the Al solidified in the feed part of the gate 19 is on the inside of an end ring 21 and affects less the mechanical balance of the rotor. |
