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发明授权
CN101954569B L形螺母/螺栓回转工具及其制造方法 失效 - 权利终止

L形螺母/螺栓回转工具及其制造方法
摘要：
本发明涉及L形螺母/螺栓回转工具的制造方法及L形螺母/螺栓回转工具。本发明目的在于，提供能通过环状部件增加头部强度的L形螺母/螺栓回转工具的制造方法。该制造方法包括：切断工序，将长钢管切断，取得一定长度的坯料(1)；密接工序，该切断工序之后，在坯料(1)前端外周配置内径比坯料(1)外径大的环状部件(R)，将扩管用阳模(20)插入坯料(1)前端内壁，对坯料(1)前端进行扩管，使环状部件(R)密接于坯料(1)前端；六角部口径形成工序，该密接工序之后，将具有六角部口径的阳模(30)插入坯料(1)的前端内壁，在坯料(1)的前端内壁形成六角部口径；L形加工工序，该六角部口径形成工序之后，在坯料(1)的所定位置进行弯曲加工，加工成L形。
摘要（英）：

A manufacturing method for an L-shaped nut/bolt turning tool is provided with a cutting step of cutting an elongated steel pipe to obtain a predetermined length of blank (1); an adhesion step of arranging an annular member (R) having an inner diameter larger than an outer diameter of the blank (1) on an outer periphery of a tip of the blank after the cutting step and inserting a flaring male die (20) into an inner wall of the tip of the blank (1) and flaring the tip of the blank (1) to adhere the annular member (R) tightly to the tip of the blank (1); a hexagonal aperture forming step of inserting a male die (30) having a hexagonal shape portion into the inner wall of the tip of the blank (1) after the adhesion step and forming a hexagonal aperture in the inner wall of the tip of the blank (1); and an L-shape forming step of bending the blank (1) at a predetermined position thereof into an L-shape after the hexagonal aperture forming step.

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