Abstract: In order to realize the mass production of 30CrMnSiA steel external gear friction plate and solve the problem of single piece production process such as tedious process, low production efficiency and high cost, the process test of hot-rolled plate was studied. The optimal production process is obtained, which consists of spheroidizing annealing at (735 ± 3) ℃ for 13-15 h, cold rolling, fine blanking, austenitizing at 860 ℃ for 60 min and oil quenching, and then pre-tempering at 380 ℃ for 60 min, molded disc tempering at 550 ℃ and oxidation treatment. In addition, using the improved hot forming die with increasing intermediate layer for the molded disc tempering can achieve a higher charging number (60 pieces per mold) and 100% product qualification rate. The microstructure of the obtained friction plate is tempered martensite, and the grain size is 8.5 grade. Furthermore, the 10 sets of gear friction disc produced in small batch pass the examination and are normal, and the properties meet the requirements.

Key words: friction plate, disking, fine blanking, hot-forming