PURPOSE: To dispense with a post process such as the cutting and the buff grinding after welding a joint part by achieving the joining of the joint part of a friction plate to be ring-formed in a recessed manner from the surface of the friction plate.
CONSTITUTION: A rolled stock consisting of the strip steel sheet is fed to a ring forming machine in the longitudinal direction, and the rolled stock is bent in the strip width direction, and cut so that the rolled stock is of ring shape to form a ring-shaped friction plate 10. When the ring is formed, a joint part 11 is welded. The plasma arc welding is preferably used because the welding is made so that the joint part 11 is not larger than the thickness of the friction plate 10. The welding is made so that the bead width of the joint part 11 of the ring-shaped friction plate 10 is ≤2mm, and the depth of the recess from the friction surface is ≤0.5mm. The irregular wear of the friction material in contact can be eliminated, and the post process such as the cutting and the buff grinding can be dispensed with.
HIGUCHI TADASHI
NAKANO TAKAAKI
IKUTA HIROYUKI
UCHINO RYUICHI
