(57) Disclosed is a method of bending a plate material by means of an exclusive-use die
shoe for the plate material to be worked and a versatile bending means having a pressing
surface. wherein the edge portion of the die shoe (10) serves as a bending surface
(11) for the plate material (5); the plate material (5) is mounted on and secured
to the die shoe (10). bending means (15, 16, and 17; 18) are brought into contact
with and pressed against a portion of the surface to be bent (13) of the plate material
(5), moving the same along the surface to be bent, and bending the surface to be bent
step by step. The bending means (15, 16, and 17) comprise a plurality of bending members,
each bending member being formed in such a manner that the angle of each of the pressing
surfaces (19, 20, and 21) thereof is formed such as to become gradually larger, and
the bending members are used in sequence starting with the one having the pressing
surface with the smallest angle. Or, the bending means (18) is a bending member having
a pressing surface parallel to the axis of the bending member and is inclined against
the plate material step by step.
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