Method of manufacturing blind rivet

Abstract

A method of manufacturing blind rivets is revealed. First cutting a steel wire rod to get a rod with required length and forming a head portion at one end of the rod. Then performing threading on an outer surface of the rod to form outer threads and carrying out heat treatment including quenching and tempering at 380° C.±50° C. to get a threaded rod. Next cutting a steel wire rod according to a length required to get a tube and forming a through hole axially penetrating the tube and corresponding to the threaded rod. Then forming a mounting portion at an outer edge of one end of the tube, carrying out optical heat treatment at 1100° C.±100° C., and performing electroplating to get an outer tube. Lastly the threaded rod is inserted into the through hole of the outer tube and the assembly is completed.

What is claimed is: 
     
         1 . A method of manufacturing a blind rivet which includes a threaded rod and an outer tube comprising the steps of:
 cutting a steel wire rod according to a length required to get a rod and forming a head portion at one end of the rod; then performing threading on an outer surface of the rod to form outer threads and carrying out heat treatment including quenching and tempering at 380° C.±50° C. to get the threaded rod;   cutting a steel wire rod according to a length required to get a tube and forming a through hole axially penetrating the tube and corresponding to the threaded rod; next forming a mounting portion at an outer edge of one end of the tube, carrying out optical heat treatment at 1100° C.±100° C. with a moveable heat source, and performing electroplating to get the outer tube; and   inserting the threaded rod into the through hole of the outer tube and the head portion of the threaded rod exposed outside and abutting against an end of the outer tube arranged opposite to the end of the outer tube with the mounting portion to complete assembly of the blind rivet.   
     
     
         2 . The method as claimed in  claim 1 , wherein a protruding locking portion which is corresponding to the mounting portion is formed in the through hole of the outer tube. 
     
     
         3 . The method as claimed in  claim 1 , wherein the optical heat treatment carried out on the outer tube is laser heat treatment.