Manufacturing Process of a Wheel Nut Wrench

Abstract

In order to provide a manufacturing process for a wheel nut wrench in which strength of a nut socket portion is increased even though the process is facilitated under a situation where a tube made of carbon steel such as S45C is used as a material, the process includes the steps of: using a tube-shaped steel tube, forming a nut socket shell portion having a cross section of a hexagonal shape at an end portion thereof by cold pressing, pressing a sleeve made by a belt-shaped steel plate being bent and having a cross section of a hexagonal shape into the nut socket shell portion, and unifying a nut socket portion with the sleeve by plastic deforming.

1 . A manufacturing process of a wheel nut wrench comprising the steps of:
 providing a tube-shaped steel tube;   forming a nut socket shell portion having a cross section of a hexagonal shape at an end portion of the steel tube by cold pressing;   pressing a sleeve made by a belt-shaped steel plate being bent and having a cross section of a hexagonal shape into the nut socket shell portion; and   unifying a nut socket portion with the sleeve by plastic deforming.   
     
     
         2 . The manufacturing process of the wheel nut wrench according to  claim 1 , wherein
 a shape of the nut socket shell portion is constituted in a manner that outer and inner peripheries thereof are both formed in a hexagonal shape.   
     
     
         3 . The manufacturing process of the wheel nut wrench according to  claim 1 , wherein
 a heat treatment is performed for the sleeve.