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    • 7. 发明申请
    • HOLLOW COIL SPRING AND METHOD FOR MANUFACTURING SAME
    • 中空螺旋弹簧及其制造方法
    • WO2012073786A9
    • 2013-06-06
    • PCT/JP2011077055
    • 2011-11-24
    • NHK SPRING CO LTDYAJIMA TAKASHIMORINO KENICHIRO
    • YAJIMA TAKASHIMORINO KENICHIRO
    • B21D41/04B21D22/14B21F35/00B21H1/18F16F1/06
    • F16F1/042B21D11/06B21D22/14B21D41/045B21F35/00Y10T29/49609
    • Provided are a hollow coil spring and a method for manufacturing the hollow coil spring, whereby inner surface corrosion can be prevented, and product appearance can be improved. In an end sealing step, the core material of an end (Wa) of a spring material (W) is gathered by machining to seal the end (Wa). Spinning is preferably carried out as the form of machining. While pressing the end of the spring material (W) with a squeezing roller (R), for example, toward the inside in the radial direction, the squeezing roller (R) is appropriately moved in the axial direction as necessary. The end (Wa) of the spring material (W) is thus occluded, as shown in figure 3, eliminating the need to use a separate member such as a lid member. Such an end sealing step can be carried out immediately after an inner surface processing step, for example. In a coil forming step performed after the end sealing step, even if the end (Wa) of the spring material (W) is gripped and the spring material (W) is wrapped around a rod, the formation of a gap at the end (Wa) will be prevented.
    • 本发明提供一种中空螺旋弹簧和中空螺旋弹簧的制造方法,能够防止内表面的腐蚀,能够提高产品的外观。 在端部密封步骤中,弹簧材料(W)的端部(Wa)的芯材料通过机械加工来密封端部(Wa)。 旋转优选作为加工的形式进行。 在挤压辊(R)例如向径向内侧按压弹簧材料(W)的端部时,挤压辊(R)根据需要适当地沿轴向移动。 因此,如图3所示,弹簧材料(W)的端部(Wa)被封闭,消除了使用诸如盖构件的单独构件的需要。 例如,可以在内表面处理工序之后立即进行这样的端部密封工序。 在端密封步骤之后进行的线圈形成步骤中,即使弹簧材料(W)的端部(Wa)被夹紧并且弹簧材料(W)缠绕在杆上,则在端部处形成间隙 Wa)将被阻止。