| 摘要 |
A method of manufacturing a movable core having a valve shaft, of a solenoid valve with which the movable core and the valve shaft can be easily and accurately aligned with each other. The valve shaft and the movable core are manufactured by sintering as follows. First, with a lower punch inserted in a cavity of a first mold, SUS powder having an average particle diameter of 150 micrometer is put in the cavity. The powder is compacted into a powder compact in the shape of a valve shaft by lowering an upper punch into the cavity. The first mold is slightly lowered so that the powder compact slightly protrudes from the cavity. Fe powder having an average particle diameter of 150 micrometers is put in a cavity of a second mold so as to be deposited on the powder compact in the cavity of the first mold. The upper punch is lowered to compact the powder in the second mold into a powder compact in the shape of the core. After releasing the powder compacts, they are joined together by sintering. |
