| 摘要 |
PROBLEM TO BE SOLVED: To obtain a bonded magnet with sufficient strength not to be cracked by cold and hot impact. SOLUTION: In the process of manufacturing a ringed bonded magnet, molten resin material 4 comprising thin small thin magnetic powder is injected from gates 2 prepared in two or more positions in a circumferential direction into a circular cavity 1, the molten resin material 4 injected from each gate 2 is turned to the same circumferential direction of the cavity 1 to be injected. The gate 2 is inclined within range of 20°-45°from an orthogonal direction to the circumferential direction of the cavity 1. COPYRIGHT: (C)2009,JPO&INPIT |
