Method for forming a spanner

Abstract

A method for forming a spanner includes following steps: preparing a cylindrical metal blank, heating the metal blank to become softened, shaping the metal blank by pressing and pushing the metal blank forward on a shaping die with a pushing unit to form two head sections and a holding section connected between the head sections, and stamping the metal blank when the metal blank still has residual heat to flatten the holding section and shape each head section into a spanner-shaped part. Therefore, a spanner product is made. The method simplifies the processing procedures, decreases residual materials, achieves a quick shaping operation, reduces processing costs, and increases the forming efficiency.

What is claimed is: 
     
         1 . A method for forming a spanner comprising steps of:
 preparing a cylindrical metal blank, said cylindrical metal blank being made by cutting a cylindrical metal material into sections;   heating said cylindrical metal blank under a high temperature with a heating device to soften said cylindrical metal blank;   shaping said heated cylindrical metal blank with a shaping device, said shaping device having a base, a shaping die situated on said base and providing a first end and a second end, and a pushing unit movably disposed relative to said shaping die, said cylindrical metal blank being pressed and pushed by said pushing unit and pushed forward from said first end of said shaping die toward said second end thereof to form a holding section and two head sections at two sides of said holding section according to a shape of said shaping die, a width of each of said head sections being larger than a width of said holding section; and   stamping said shaped cylindrical metal blank with a stamping device when said cylindrical metal blank has residual heat to flatten said holding section and shape each of said head sections to form a spanner-shaped part, thereby completing a spanner product.   
     
     
         2 . The method according to  claim 1 , wherein said cylindrical metal blank is heated by high frequency heating, medium frequency heating, or electric heating. 
     
     
         3 . The method according to  claim 1 , wherein said holding section and said head sections are processed and formed by multi-stage stamping in said stamping step. 
     
     
         4 . The method according to  claim 1 , wherein said shaping die is convexly disposed on said base and tapers off from said second end to said first end.