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    • 30. 发明公开
    • METHOD FOR MANUFACTURING LEAF SPRINGS
    • VERFAHREN ZUR HERSTELLUNG VON BLATTFEDERN
    • EP2578900A1
    • 2013-04-10
    • EP11792241.9
    • 2011-05-12
    • Nhk Spring Co., Ltd.
    • TANGE, AkiraKURIMOTO, KiyoshiGOTO, YurikaSHIGEOKA, IwaoKATO, TadakazuINOGUCHI, Shinichi
    • F16F1/02B24C1/04B24C1/10F16F1/28
    • B21D53/886B24C1/10B24C3/325F16F1/18F16F2226/00
    • A production method for a leaf spring, which can improve the durability of the eye portion and the productivity and which can reduce the production cost, is provided.
      In forming of a gap portion 115, a leading end portion 113 of an eye portion 112 faces a facing portion 114 such that each straight line L1 and L2 does not cross the leading end portion 113 of the eye portion 112, the straight line L1 connecting an intersection point T1 and a center point S1 of a reflection surface of a reflection member, the straight line L2 connecting an intersection point T1 and a center point S2 of a reflection surface of a reflection member, the intersection point T1 being between a perpendicular line H1 and a surface of the facing portion 114, the perpendicular line H1 extending from a leaf portion 111 side end point 113A of the leading end portion 113 of the eye portion 112 to the facing portion 114. Thus, shots, which are reflected by the reflection surface of the reflection member in the shot peening to the eye portion 112 inner surface, are projected to the entire surface of the facing portion 114 at the gap portion 115. In forming of the eye portion 112, cutting of a leading end portion thereof is unnecessary.
    • 提供了一种可以提高眼部的耐久性和生产率的片簧的制造方法,能够降低生产成本。 在形成间隙部115时,眼部112的前端部113面对面对部114,使得直线L1和L2不与眼部112的前端部113交叉,直线L1连接 交点T1和反射构件的反射面的中心点S1,连接交点T1和反射构件的反射面的中心点S2的直线L2,交点T1在垂直线之间 H1和面对部分114的表面,垂直线H1从眼部112的前端部113的叶部111侧端点113A延伸到面对部分114.因此,由 在眼部112内表面的喷丸硬化中的反射构件的反射面在间隙部115处突出到对置部114的整个表面。在形成眼部112时,切割 其前端的部分是不必要的。