Local heat treatment system and cold forming method using the same

Abstract

The present disclosure relates to a local heat treatment system and a cold forming method using the same. The local heat treatment system includes a heating device configured to locally heat only a plastic deformation occurrence portion of a blank material to a predetermined temperature, a moving device configured to move the heating device to a position of a local heating region of the blank material, and a controller configured to control the heating device and the moving device.

1 . A local heat treatment system comprising:
 a heating device configured to locally heat only a plastic deformation occurrence portion of a blank material to a predetermined temperature;   a moving device configured to move the heating device to a position of a local heating region of the blank material; and   a controller configured to control the heating device and the moving device.   
     
     
         2 . The local heat treatment system according to  claim 1 , wherein
 the heating device comprises:   a housing coupled to the moving device;   a heat source coupled to the housing to emit near-infrared rays; and   a reflector provided in the housing to condense light into the local heating region by reflecting the near-infrared rays generated by the heat source.   
     
     
         3 . The local heat treatment system according to  claim 1 , wherein
 the moving device comprises:   a rotating joint coupled to the heating device; and   a plurality of moving members coupled to the rotating joint to move the heating device in three axes (x, y, and z) directions.   
     
     
         4 . The local heat treatment system according to  claim 3 , wherein
 the plurality of moving members comprises:   a first moving member coupled to the rotating joint to move the heating device in a direction in which the blank material is disposed;   a second moving member coupled to the first moving member to move the first moving member in a vertical direction; and   a third moving member coupled to the second moving member to move the second moving member in a horizontal direction.   
     
     
         5 . The local heat treatment system according to  claim 1 , wherein
 the moving device and the heating device are provided as one sub-assembly,   a plurality of the sub-assemblies is provided to locally heat the blank material on one side and the other side of the blank material, respectively, and   the sub-assemblies are independently controlled by the controller.   
     
     
         6 . The local heat treatment system according to  claim 1 , wherein
 the controller controls the moving device and the heating device by setting a local heating position, a heating temperature, and a heating time in consideration of a strain and stress depending on a shape to be molded in a forming process of the blank material.   
     
     
         7 . A cold forming method using the local heat treatment system according to  claim 1 , comprising:
 (a) operating the moving device so that the heating device is located in the local heating region, which is the plastic deformation occurrence portion, when the blank material is introduced into the local heat treatment system;   (b) locally adjusting the physical properties of the blank material by heating and then cooling the plastic deformation occurrence portion of the blank material through the heating device to a predetermined temperature when the heating device is located in the local heating region; and   (c) performing cold forming after moving the blank material whose physical properties is adjusted to a mold.   
     
     
         8 . The cold forming method according to  claim 7 , wherein
 in process (a), the controller of the local heat treatment system controls the moving device and the heating device by setting a local heating position, a heating temperature, and a heating time in consideration of a strain and stress depending on a shape to be molded in a forming process of the blank material.