Abstract: Material powder 17 is filled in a cavity 16 which is composed of a die 12 having a die hole 11 in a shape matching the contour of a green compact and a lower punch 13. The material powder 17 is temporarily compressed by an upper punch 14 and the lower punch 13 to obtain a preform 18. A punch-out pin 15a is inserted into the preform 18 to punch out a shape of a through-hole 3. The preform 18 is pressurized and compressed by both of the upper and lower punches 14, 13 to obtain a green compact 19. The punch-out pin 15a is pulled out from the green compact 19 and the green compact 19 is taken out from the cavity 16. Further, the green compact 19 is sintered and a pair of leg parts 24 connected continuously at a base part 23 and an undercut part 25 between the leg parts 24 are formed by cutting off a part of a peripheral wall 26 of a through-hole 25a.

Abstract: A divided type antifriction bearing assembly with a seal having two semicircular divided inner annular members each having a track on the outer peripheral surface thereof and having at the axially outer end of the track a flange portion which is in contact with the end surface of a roller, the inner annular members each forming a cylindrical shape having a cylindrical portion axially extending continuously to the flange portion, the inner annular members being divided along the axis thereof and coupled together, an outer annular member having a track on the inner peripheral surface thereof opposed to the inner annular members, and rollers provided between the tracks of the inner and outer annular members is characterized in that the bearing assembly includes a seal member mounted radially inwardly outside the track of the outer annular member, the inner peripheral portion of the seal member is in sliding contact with a portion of the cylindrical portion of each of the inner annular members, and the inner annu