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    • 11. 发明授权
    • Pressure die-casting process of magnesium alloys
    • 压铸镁合金压铸工艺
    • US06467527B1
    • 2002-10-22
    • US09586760
    • 2000-06-05
    • Kohei KubotaKoichi SatohMasaru YamamotoYoichi NosakaYasuhisa GotoTakeshi Doi
    • Kohei KubotaKoichi SatohMasaru YamamotoYoichi NosakaYasuhisa GotoTakeshi Doi
    • B22D2709
    • B22D17/08B22D21/007
    • A method for die-casting a magnesium alloy comprises the step of casting a die cast product free of any hot tearing, shrinkage tearing and shrinkage cavity starting from a magnesium alloy comprising i) 1 to 10% by weight of aluminum; ii) at least one member selected from the group consisting of 0.2 to 5% by weight of a rare earth metal, 0.02 to 5% by weight of calcium and 0.2 to 10% by weight of silicon; and iii) not more than 1.5% by weight of manganese, and the balance of magnesium and inevitable impurities, using a cold chamber type die-casting machine, wherein a) the temperature of the molten magnesium alloy is maintained at 650 to 750°C.; b) the charging velocity of the molten metal is set at {fraction (1/100)} to {fraction (10/100)} second; and c) the intensified pressure after the charging is set at a level of not less than 200 kgf/cm2. Thus, a die cast product free of any hot tearing, shrinkage tearing and shrinkage cavity can be produced by appropriately specifying injection conditions, mold conditions, conditions for melting a magnesium alloy and mold plan in the cold chamber type die-casting machine, or by appropriately controlling the temperature of the molten metal from the molten metal-accommodating pot to the gate portion of the machine.
    • 压铸镁合金的方法包括以下步骤:铸造不含任何热裂纹,收缩撕裂和收缩空腔的压铸产品,该镁合金包括:i)1至10重量%的铝; ii)选自0.2至5重量%的稀土金属,0.02至5重量%的钙和0.2至10重量%的硅中的至少一种; 和iii)使用冷室式压铸机不超过1.5重量%的锰,剩余的镁和不可避免的杂质,其中a)熔融镁合金的温度保持在650-750℃ 。 b)熔融金属的充电速度设定为{分数(1/100)}至{分数(10/100)}秒; 和c)充电后的增压压力设定在不低于200kgf / cm2的水平。 因此,通过在冷室型压铸机中适当地指定注射条件,模具条件,熔融镁合金条件和模具计划,或者由冷却室型压铸机中的模具计划,可以通过适当地指定没有任何热撕裂,收缩撕裂和收缩腔的压铸产品 适当地将熔融金属的温度从熔融金属容纳罐适当地控制到机器的浇口部分。
    • 18. 发明授权
    • Magnetic disk drive with a head oscillation function and the control method thereof
    • 具有磁头振荡功能的磁盘驱动器及其控制方法
    • US06747833B2
    • 2004-06-08
    • US09887064
    • 2001-06-25
    • Masayoshi ShimokoshiTakeshi Doi
    • Masayoshi ShimokoshiTakeshi Doi
    • G11B5596
    • G11B5/012G11B5/5547G11B21/083
    • The position information of the magnetic head is generated also from the data area to improve the positioning accuracy. The magnetic disk drive has a function of oscillating the magnetic head in the radial direction in the data area at a specific frequency and a function of detecting a read signal during the execution of the oscillation function and detects position information of the magnetic head from the detected read signal. The magnetic head position control can be performed in the data area. The magnetic head position signal not dependent on the frequency of a sampling signal generated from the servo information area can be generated. This in turn improves the data recording density and allows a highly precise position control of the magnetic head, thus improving the reliability of the magnetic disk drive.
    • 也可以从数据区域生成磁头的位置信息,以提高定位精度。 磁盘驱动器具有以特定频率在数据区域中径向振荡磁头的功能,以及在执行振荡功能期间检测读取信号的功能,并且从检测到的磁头驱动器检测磁头的位置信息 读信号。 可以在数据区域中执行磁头位置控制。 可以生成不依赖于从伺服信息区域产生的采样信号的频率的磁头位置信号。 这又提高了数据记录密度,并且允许磁头的高精度位置控制,从而提高了磁盘驱动器的可靠性。