Multistage gear-rolling apparatus

摘要

A multistage gear-rolling apparatus of the present invention comprises a roller squeezing apparatus (31,41) including a roughing roller die (32,42) and a finishing roller die (33,43) disposed coaxially and connected in series in an axial direction of said roughing roller die (32,42). The roughing roller die is used for carrying out a hot rough-rolling step. The finishing roller die (32,42) is used for a warm finish-rolling step. Thus, immediately after the hot rough-rolling step, the warm finish-rolling step can be carried out without a reset of workpiece (7).