Abstract
To content high productivity and low manufacturing cost, it is believed that direct dry hobbing after gear material heat treatment is the best manufacturing method. First, 0.45% carbon steel of round bar gear material was hardened to HRC53-56 by high frequency induction heat treatment till the specified depth. Next, the high-hardened material was directly hobbed by special carbide hob installed on a highly rigid CNC hobbing machine without using cutting oils. Thus, the author have developed Direct Dry Hobbing of High hardened Material, called the RGC (Round bar Gear Cutting) Method. The gears applying the RGC Method were module 0.8 to 1.25 and of helix angle 25°. The gear profile accuracy was JIS Grade 1-2. Gear motors incorporating gears manufactured by the RGC Method are now receiving remarkable customers satisfaction as low noise and low vibration gear motors.
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