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    • 1. 发明申请
    • THREAD FORMING DIE AND METHOD
    • 螺纹成型和方法
    • WO2012009439A1
    • 2012-01-19
    • PCT/US2011/043856
    • 2011-07-13
    • ILLINOIS TOOL WORKS INC.LEVEY, Kenneth R.
    • LEVEY, Kenneth R.
    • B21H3/06
    • B21H3/06
    • A die for roll forming threads on a cylindrical blank comprises, a generally planar die body having a longitudinally elongate working face of sufficient length for the blank to make multiple revolutions across said face. A plurality of spaced apart thread forming elements (17) on the face extend from a start end (14) where thread formation commences to finish end (16) where thread formation is complete. The thread forming elements are spaced apart longitudinally of the die working face an ever increasing distance (P R ), based on the actual rolling diameter of the blank with the spacing between the thread forming elements at the start end (14) equal to the diameter of the blank and the spacing between said thread forming elements at said finish end (16) equal to eighty-five percent of the final diameter of the thread formed on the blank. The thread forming elements on the working face of said die are equally spaced apart (Pa) in a direction perpendicular to said longitudinal extent of said working face. A method of making a threaded fastener from a cylindrical blank utilizes rolling dies in accordance with the disclosure.
    • 用于圆柱形坯料上的成形螺纹的模具包括:大致平面的模具主体,其具有足够长度的纵向细长的工作面,用于坯件跨越所述面进行多次转动。 在表面上的多个间隔开的螺纹形成元件(17)从螺纹形成开始的开始端(14)延伸到螺纹形成完成的完成端(16)。 螺纹形成元件在模具工作面的纵向间隔开一个不断增加的距离(PR),基于坯料的实际滚动直径,在起始端(14)处的螺纹形成元件之间的间隔等于 坯件和所述精加工端(16)处的所述螺纹形成元件之间的间距等于形成在坯件上的螺纹的最终直径的百分之八十五。 所述模具的工作面上的螺纹形成元件在垂直于所述工作面的所述纵向范围的方向上等间隔开(Pa)。 根据本公开,由圆柱形坯料制造螺纹紧固件的方法利用轧制模具。