Shape member manufacturing apparatus and shape member manufacturing method

Abstract

The invention provides a shape member manufacturing apparatus and a shape member manufacturing method which aims at cutting and grinding a joint projection 8 B formed when a plurality of shape members are joined together by welding or friction stir welding, in a short time with high accuracy. A plurality of mounts 11 having a side structure 8 placed thereon are arranged in the longitudinal direction of the side structure. A joint projection 8 B of a welded portion or a friction stir welded joint is formed on the surface of the side structure 8 in its longitudinal direction. A carrier 100 travels in the longitudinal direction of the side structure 8. Columns 105 are installed in a girder 103 of the carrier, and a milling cutter device 80 and a grinding device 90 are installed in lower portions of the columns 105. A milling surface of a milling cutter 81 of the milling cutter device 80 has a circular-arc shape with a radius R. The milling cutter 81 performs cutting at an angle θ1 tilted with respect to a vertical line. Further, the milling cutter device is provided with sliding plates 85 . The milling cutter device performs cutting with the sliding plates 85 brought into contact with the surfaces of the extruded shape members.

1 . A shape member manufacturing method comprising the steps of 
 constraining and positioning shape members where a joint projection is continuously formed in a longitudinal direction of the shape members on a surface of a joint obtained by joining a plurality of the shape members together,    disposing a milling cutter device comprising a curved milling surface having its widthwise central portion bulged toward the shape members so as to cut the joint projection of the shape members,    cutting the joint projection in the longitudinal direction of the shape members in a state in which the widthwise central portion of the milling surface of the milling cutter is caused to conform to one widthwise end of the joint projection and cutting the joint projection in the longitudinal direction of the shape members in a state in which the widthwise central portion of the milling surface of the milling cutter is caused to conform to the other widthwise end of the joint projection.    
   
   
       2 . The shape member manufacturing method according to  claim 1 , 
 wherein a direction that the milling cutter device moves when cutting one end of the joint projection and a direction that the milling cutter device moves when cutting the other end of the joint projection are reverse to each other.    
   
   
       3 . The shape member manufacturing method according to  claim 1 , 
 wherein the milling cutter device cuts the one end of the joint projection of the shape members through up-cutting, and cuts the other end of the joint projection of the shape members through down-cutting.    
   
   
       4 . The shape member manufacturing method according to  claim 1 , 
 wherein a surface of a cut portion of the shape members is ground after the completion of the cutting of the one end and other end of the joint projection of the shape members.