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    • 2. 发明公开
    • METHOD FOR PRODUCING HALLOW ENGINE VALVE
    • VERFAHREN ZUR HERSTELLUNG EINES HOHLEN MOTORVENTILS
    • EP2541002A1
    • 2013-01-02
    • EP10846579.0
    • 2010-09-24
    • Mitsubishi Heavy Industries, Ltd.Yoshimura Company
    • MORII, HirokazuYOSHIMURA, Hyoji
    • F01L3/20F01L3/14F01L3/24
    • F01L3/00B21C23/183B21K1/22B23P15/002F01L3/14Y10T29/49298Y10T29/49307Y10T29/49309Y10T29/49405
    • Provided is a method for producing a hallow engine valve which can easily produce a hallow engine valve in which strength is improved and weight is reduced. Specifically, provided is a method for producing a hallow engine valve which involves gradually reducing the size of the outer diameter and inner diameter of a hallow shaft of a semi-finished product (10a), sequentially inserting the hallow shaft into a plurality of molding holes (M1, M2', M(m-1), Mm, M(n-1), Mn) having different hole shapes so as to gradually extend the length of the hallow shaft, and forming the hallow shaft into a predetermined shape by sequentially performing said drawing process, wherein the semi-finished product (10a) is subjected to heat treatment such that the hardness thereof is equal to or less than a predetermined hardness, and the maximum thickness (t2') between the hallow shaft and an umbrella portion connected to the bottom edge of the hallow shaft is formed to be thicker than the thickness (t2) of the hallow shaft by means of molding hole (M2') of a die (Di2') which is adjusted to have a specific length (L2') and maximum inner diameter (D2').
    • 提供一种能够容易地制造提高强度并减轻重量的中速发动机气门的中空发动机阀的制造方法。 具体地说,提供了一种制造中空发动机阀的方法,其包括逐渐减小半成品(10a)的中轴的外径和内径的尺寸,顺序地将中心轴插入多个成型孔 具有不同孔形状的(M1,M2',M(m-1),Mm,M(n-1),Mn),以便逐渐延长中心轴的长度,并且通过 依次执行所述拉伸处理,其中对半成品(10a)进行热处理,使得其硬度等于或小于预定硬度,并且中心轴和伞之间的最大厚度(t2') 通过模具(Di2')的成型孔(M2'),连接到所述中心轴的底部边缘的部分形成为比所述中心轴的厚度(t2)厚,所述模具孔被调整为具有特定长度 L2')和最大内径(D2')。