Coil forming device

A coil forming device configured to perform flatwise bending on a flat-square conductive material end as an end of a flat-square conductive material constituting a coil, the coil forming device comprising:

• a first die configured to independently rotate around a first rotation axis, the first die including a first machining surface;
• and
• a second die configured to independently rotate around the first rotation axis, the second die including a second machining surface,
• the first machining surface and the second machining surface being configured to be placed so as to face each other across the flat-square conductive material end in an axis direction of the first rotation axis;
• the first machining surface including a recess portion recessed so as to be distanced from the second machining surface when the first machining surface and the second machining surface face each other,
• the second machining surface including a protrusion portion protruding toward the recess portion when the first machining surface and the second machining surface face each other,
• an edge line of the protrusion portion extends in an arc shape around the axis direction of the first rotation axis,
• the protrusion portion including an inclined region and an escape region adjacent to each other in a rotation direction of the second die,
• the inclined region and the escape region being placed such that, when the second die is rotated relative to the first die in a first rotation direction, the inclined region first faces the recess portion in the axis direction of the first rotation axis, and then, the escape region faces the recess portion in the axis direction of the first rotation axis,
• the edge line in the inclined region being inclined so that a clearance between the edge line in the inclined region and the recess portion in the axis direction of the first rotation axis is gradually decreased as the second die is rotated relative to the first die in the first rotation direction,
• the edge line in the escape region being formed so that a clearance between the edge line in the escape region and the recess portion in the axis direction of the first rotation axis is larger than a minimum clearance between the edge line in the inclined region and the recess portion in the axis direction of the first rotation axis;
• and
• when the second die is rotated relative to the first die in the first rotation direction in a state where the flat-square conductive material end is placed between the first machining surface and the second machining surface so that two flat surfaces of the flat-square conductive material end face the first machining surface and the second machining surface respectively, the flat-square conductive material end being bent in flatwise bending by the recess portion and the inclined region of the protrusion portion, and then, the flat-square conductive material end being placed in the escape region.