| 摘要 |
PURPOSE:To obtain a lightweight clutch driven disc and to prevent a clutch facing member from cracking upon mold-releasing after thermopress molding, by thermopress molding the clutch driven disc after dimpling the clutch facing member. CONSTITUTION:After a back-up member 2 being formed, a molded clutch facing member 3 is inserted in male molding dies 8 through 10, and then the dies are fastened for several seconds at a room temperature so as to form dimples 4. Then, the back-up member 2 is laid on the member 3, and a molding die 7 is fastened thereto for thermopress molding at a temperature of about 150deg.C with a surface pressure of 600kg/cm<2>. Thereafter, a clutch driven disc 1 is hardened under heat-treated at about 200deg.C, and then, is polished and formed therein with rivet holes so as to have a thickness of about 3.5mm. Then, the molding dies are changed, and after setting the temperature to about 150deg.C, the back-up member 2 is disposed in a groove in a molding die 13. The member 3 is formed into a ring-like shape having a uniform thickness, and is then laid on the back-up member 2. Then, pin 16 parts are pressed into the members so as to form dimple parts, and thereafter, die pressing beds 14, 15 are set thereon so as to fasten the dies with a surface pressure of about 600kg/cm<2> for thermopress molding. |
