Process for gear-rolling a high accuracy gear

摘要

According to the present invention, in a heating step, an outer circumferential portion of a workpiece having a disk shape is heated to high temperatures. In a hot rough-rolling step, the outer circumferential portion of the heated workpiece is formed by use of a roller die to generate a rolled-gear having teeth. In a warm finish-rolling step, the teeth of the rolled-gear are finish-rolled by use of the finishing roller die. The starting temperature T1 of the hot rough-rolling step is set in the range of from 850 DEG through 1100 DEG C., the terminating temperature of the hot rough-rolling step T2 is set in the range of from 500 DEG through 700 DEG C. The starting temperature T3 of the warm finish-rolling step is set in the range of from 400 DEG through 700 DEG C., and the terminating temperature of the warm finish-rolling step T4 is set in the range of from 200 DEG through 650 DEG C.