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    • 1. 发明申请
    • Method for manufacturing fastening screw and fastening screw
    • 紧固螺丝和紧固螺丝的制造方法
    • US20120070247A1
    • 2012-03-22
    • US13137803
    • 2011-09-14
    • Tadashi TashimaToshiyuki Nishimura
    • Tadashi TashimaToshiyuki Nishimura
    • F16B35/00B23G9/00
    • B21K1/463B21K1/56F16B35/06F16B39/282
    • An object of the present invention is to reduce the fastening time and to obtain a predetermined fastening force and to suppress the loosening of a screw. The solution of the present invention is to provide a method for manufacturing a fastening screw, which comprises: a preliminary upsetting step B for forging a front end of a blank wire 1 and forming a head 1a having a depression 1d in a condition, where a curve portion 1b remains in an outer periphery to be formed into a bearing surface of the fastening screw, by means of a die 21 having a protrusion 21b protruding from a flat end face 21a and a first punch 20 having a cup-shaped cavity 20a, the front end protruding from the protrusion 21b of the die 21; a finish upsetting step C for forging the head 1a and forming a recess 1c so that the depression 1d of the head 1a is not interfered with the recess 1c by the die 21 and a second punch 30 having a protrusion 30b for forming the recess 1c on the head 1a; and a thread forming step D for processing a shank 1e extending from the head 1 and forming threads on the shank 1e.
    • 本发明的目的是减少紧固时间并获得预定的紧固力并抑制螺丝的松动。 本发明的解决方案是提供一种用于制造紧固螺钉的方法,其包括:用于锻造坯料丝1的前端并形成具有凹陷1d的头部1a的初步镦锻步骤B,其中, 弯曲部分1b通过具有从平坦端面21a突出的突起21b的模具21和具有杯形腔20a的第一冲头20保持在外周中以形成紧固螺钉的支承表面, 前端从模具21的突起21b突出; 用于锻造头部1a并形成凹部1c的完成镦锻步骤C,使得头部1a的凹部1d不被模具21干涉凹部1c,以及具有用于形成凹部1c的突起30b的第二冲头30 头1a; 以及螺纹形成步骤D,用于处理从头部1延伸的柄1e并在柄部1e上形成螺纹。