Method for cutting parts free from a metal sheet

摘要

When a metal sheet is formed with a target shape portion, a remaining portion surrounds the target shape portion and elongated joint portion(s) join the target shape portion with the remaining portion. The apparatus cuts out the target shape portion from the metal sheet by shearing the joint portion at a region bordering on the target portion to cut out the target shape portion. The apparatus comprises a movable blade member designed to move to a position below the joint portion and a fixed blade member for pressing the joint portion from above. The apparatus, which is placed at a fixed position, rotates or linearly moves the movable blade member with respect to the fixed blade member to shear the joint portion at a region bordering on the target portion and bend a sheared-side end of the sheared joint portion upward.