Method of manufacturing an engaging element for one way clutch improving squareness of cam face relative to side surfaces

A method of manufacturing an engaging element for a one way clutch, said engaging element being designed to be disposed between an inner ring and an outer ring and having a cam face engageable with the inner and outer rings, said method comprising:

• forming a sheared member of a predetermined size by shearing a material by a press;
• and
• cold forging said sheared member by a forging process including placing said sheared member in a die and striking by means of a striking member side surfaces of said sheared member other than a circumferential surface thereof intended to serve as a cam face, with a surface of said striking member which strikes one side surface of said sheared member being planar and maintained parallel with a planar surface of said die against which is pressed an opposite other side surface of said sheared member, thereby forming said side surfaces to extend parallel to each other and forming said side surfaces and said cam face to respective desired shapes, said forging process comprising the steps of:
• placing said sheared member in a first die;
• striking said one side surface of said sheared member by said striking member;
• removing said sheared member from said first die;
• inverting said sheared member and placing said thus inverted sheared member in a second die;
• striking said other side surface of said sheared member by another striking member;
• removing said sheared member from said second die;
• translating said sheared member and placing the thus translated said sheared member in a third die;
• striking said other side surface of said sheared member by another striking member;
• removing said sheared member from said third die;
• inverting said sheared member and placing said thus inverted sheared member in a fourth die;
• and
• striking said one side surface of said sheared member by another striking member.

A method of manufacturing an engaging element for a one way clutch, said engaging element being designed to be disposed between an inner ring and an outer ring and having a cam face engageable with the inner and outer rings, said method comprising:

• forming a sheared member of a predetermined size by shearing a material by a press;
• and
• cold forging said sheared member by a forging process including placing said sheared member in a die and striking by means of a striking member side surfaces of said sheared member other than a circumferential surface thereof intended to serve as a cam face, with a surface of said striking member which strikes one side surface of said sheared member being planar and maintained parallel with a planar surface of said die against which is pressed an opposite other side surface of said sheared member, thereby forming said side surfaces to extend parallel to each other and forming said side surfaces and said cam face to respective desired shapes, said forging process comprising:
• a first step comprising placing said sheared member in a first die and striking said one side surface of said sheared member by said striking member;
• a second step comprising removing said sheared member from said first die, placing said sheared member in a second die after inverting said sheared member, and striking said other side surface of said sheared member by another striking member;
• a third step comprising removing said sheared member from said second die, placing said sheared member in a third die after inverting said sheared member, and striking said one side surface of said sheared member by another striking member;
• and
• a fourth step comprising removing said sheared member from said third die, placing said sheared member in a fourth die after inverting said sheared member, and striking other side surface of said sheared member by another striking member.