Processing method for forming a work having a pair of flange bending parts

A processing method of a work, the processing method comprising:

• forming flange bending parts at respective side parts of the work, the flange bending parts including first bending parts extending in a length direction of the work;
• holding a first part of the work in the length direction where the flange bending parts are formed between a die and a pad;
• and
• pressing a second part of the work in the length direction in a thickness direction to form a second bending part extending in a width direction of the work between the first part and the second part,
• wherein:
• the die includes a supporting surface supporting the work, a first relief part including a first inclined surface a distance of which from the pad increases toward one side surface of the die from the supporting surface, and a second relief part including a second inclined surface a distance of which from the pad increases toward the other side surface of the die from the supporting surface,
• while the first part of the work is held between the die and the pad:
• a first gap is formed between the first inclined surface of the die and the work, and
• a second gap is formed between the second inclined surface of the die and the work, and
• the second bending part is formed by pressing the second part of the work in the thickness direction.