PURPOSE: To form a cuplike recessing part without drawing in reverse in a producing method for a pulley of sheet metal having the cuplike recessing part for attaching a bearing.
CONSTITUTION: This production consists of a drawing process to form a hollowed hemispheric pre-recessing part and a flange part of a flat sheet metal blank, a recessing part finishing process to finish the pre-recessing part into a cup like recessing part being able to fit with a bearing, a drum wall forming process to bend a flange-like part 12 to the recessing direction of the cup-like recessing part and to form it into a drum wall for winding a belt, and a receiving part forming process to form an opening with a prescribed diameter on the central part of the bottom wall of the cup-like recessing part and to provide an inner flange-like receiving part 24 surrounding the opening.
ODA KAZUYUKI
JPH05185176A | 1993-07-27 |