| 摘要 |
PURPOSE:To obtain the ideal tooth profile of a die with the simple method eliminating the need for high accuracy at gear cutting stage by executing form rolling a normal tooth profile by rolling a master gear by meshing with a die blank after forming a basic tooth profile for the die blank stock. CONSTITUTION:A blank is worked in the disk shape having no tooth profile on the outer periphery of a die blank 6 at 1st stage 1. The gear cutting forming a basic tooth profile 7 is executed by a gear hobbing machine, etc., on the outer peripheral face of the die blank 6 subjected to blank working in advance at 2nd stage 2. On the other hand, a master gear 8 of high hardness made of Cr.Mo steel is formed. At 3rd stage 3, then, the die blank 6 equipped with the basis tooth profile 7 and the master gear 8 are subjected to meshed rolling to subject the normal tooth profile 9 profiling the master gear 8 to execute form rolling on the die blank 6. At 4th stage, then, a heat treatment is executed on the die blank 6 equipped with the normal tooth profile 9. A die 10 is completed by executing inner diameter grinding and lapping for the die 10 after hardening at 5th stage 5.
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