| 摘要 |
PURPOSE:To improve the quality of and the productivity of an anisotropic resin magnet by disposing an electromagnet coil at the moving side of a molding machine and composing a block, a bottom mold and a stationary side mold internally mounted in the coil of ferromagnetic material and a side mold of nonmagnetic material. CONSTITUTION:The moving side II of a molding machine is composed of a ferromagnetic block 7, a nonmagnetic side mold 10 and a projection III internally mounted in a ferromagnetic casing 9, and the projection III is composed of a ferromagnetic projecting pin 5 passing through the block, a ferromagnetic bottom mold 6 connected to the pin 5 and a nonmagnetic guide pin 8. A stationary side I is composed of a ferromagnetic stationary mold. While the mixture of thermoplastic resin and ferromagnetic powder is filled in a molding cavity 3, a magnetic field is applied to the electromagnetic coil 4 to mold the mixture. Since induction magnetic flux thus linearly flows in the mixture to be molded, a magnet having strong anisotropy can be obtained, it can demagnetize and reversely magnetize the molded magnet after molding, as well as readily separate the magnet from the molds, thereby enhancing the productivity. |
