Importance

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Abstract

An useful method of producing a lot of bearings in the form of a press worked bush is initiated with production of blanks having four corner edges chamfered. In the notch forming and cutting die section comprising upper and lower die halves a strip of metallic material that is called hoop is pressed stepwise to form a plurality of V-shaped notches of which depth increases stepwise toward the outlet of the die section. On completion of forming of notches the hoop is cut off at the center of the last V-shaped notch with the aid of a pair of cutting tools. The die assembly usable for carrying out the method includes an U-bending die section and a circle bending die section which are located in series. After leaving the notch forming and cutting die section a blank is introduced into the U-bending die section by utilizing feeding movement of the hoop of the notch forming and cutting die section and thus U-bent blank is subjected to final circular bending in the circle bending die section also by utilizing feeding movement of the hoop. No feeding device is required in each of the press working steps.

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First Claim