Sequential shaping method

Abstract

A sequential shaping method is used to shape a metal sheet into a three-dimensional form by pressing and moving a rod-form tool against the metal sheet. In the method, a path along which the rod-form tool moves on the metal sheet is divided into a plurality of local movement regions based on a preset movement path of the rod-form tool; In the method, an entirety of each of the local movement regions is heated from a reverse side, the metal sheet using the rod-form tool, and after shaping the local movement regions, the local movement regions are heated continuously for a fixed time at a temperature at which the metal sheet can be annealed. Then the metal sheet is shaped while sequentially heating an entirety of a subsequent one of the local movement regions following a preceding local movement region.

1 . A sequential shaping method for shaping a metal sheet into a three-dimensional form by pressing and moving a distal end of a rod-form tool against the metal sheet, the sequential shaping method comprising:
 using the rod-form tool disposed on one main-surface side of the metal sheet, and a heating device disposed on another main-surface side of the metal sheet to heat the metal sheet;   dividing a path along which the rod-form tool moves on the metal sheet into a plurality of local movement regions based on a preset movement path of the rod-form tool;   heating an entirety of each of the local movement regions from a reverse side, and shaping the metal sheet using the rod-form tool, and after shaping the local movement regions, heating the local movement regions continuously for a fixed time at a temperature at which the metal sheet can be annealed; and   then shaping the metal sheet while sequentially heating an entirety of a subsequent one of the local movement regions following a preceding local movement region.   
     
     
         2 . The sequential shaping method according to  claim 1 , wherein
 when heating the entirety of the local movement regions for the fixed time from the reverse side, the heating is started from a region over which the rod-form tool projects in an axial direction.   
     
     
         3 . The sequential shaping method according to  claim 1 , wherein
 the metal sheet is heated for a time of 2.4×t or greater,   where t is a sheet thickness of the metal sheet.   
     
     
         4 . The sequential shaping method according to  claim 1 , wherein
 the metal sheet is shaped while being held along a periphery thereof.   
     
     
         5 . The sequential shaping method according to  claim 1 , wherein
 the heating device heats the metal sheet in a contactless manner.   
     
     
         6 . The sequential shaping method according to  claim 5 , wherein
 the heating device irradiates the metal sheet with laser light to heat the metal sheet.   
     
     
         7 . The sequential shaping method according to  claim 5 , wherein
 the heating device blows hot air onto the metal sheet to heat the metal sheet.   
     
     
         8 . A sequential shaping apparatus used in the sequential shaping method according to  claim 1 , the sequential shaping apparatus comprising:
 the rod-form tool disposed on the one main-surface side of the metal sheet,   the heating device disposed on another main-surface side of the metal sheet,   a tool-driving device that drives the rod-form tool in at least three orthogonal axial directions, and   a main control device configured to control the tool-driving device,   the heating device being configured to individually heat a plurality of the local movement regions, from reverse sides thereof, and   the main control device being configured to control the heating device based on data pertaining to driving the rod-form tool.