| 摘要 |
PROBLEM TO BE SOLVED: To prevent the degradation of insertion workability and breakage of a core by suppressing plastic deformation in inserting the core in glass run material and repeating bending work by a bending device. SOLUTION: This core 20 for inserting in a hollow part of a long workpiece in bending the long workpiece in a curved shape by a bending device includes a core material 22 buried in a core body. The core material 22 is formed of a thin plate shaped spring steel capable of elastically deforming. Projected engaging parts 23, 24 are formed inside the core body, and recessed locking parts 25, 26 are formed on the core material. The core body is formed by extrusion, and the core material 22 is buried in extruding the core body. |
