Due to the shortening of the transmission chain, the CNC gear hobbing machine greatly reduces the transmission error and improves the machining accuracy. However, for high-precision gears, especially gears with large number of teeth, large diameter, long tooth surface, high precision and long machining cycle, they require strict process guarantee during the rolling process, and must control the machining and fixture of the blank. Tools, machine tool adjustments and the environment. Otherwise, even with a CNC hobbing machine, it is difficult to machine a qualified high-precision gear. Next page
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1 tooth blank processing
The tooth blank, especially the large diameter blank, is prone to elastic deformation during clamping, which is difficult to compensate for on the hobbing machine, and thus may cause loss of gear meshing accuracy. Since the tooth surface processing often uses the gear hole and the end surface as the reference surface, the accuracy of the tooth blank is mainly required for the dimensional accuracy and shape accuracy of the gear hole, and the positional accuracy of the hole and the end surface (see GB10095-88). For gears with a precision of 6 grades, the size and shape accuracy of the positioning holes are IT6, the roughness is Ra1.6μm, and the radial runout of the gear positioning holes and the end face circular runout tolerance of the indexing circle diameter in the range of 125-400mm do not exceed 0.014 mm. Generally, two processing methods are used to ensure: 1 direct clamping and turning (one-time finishing hole and finishing end of the finishing car): 2 through-axis turning (based on the well-machined hole as the benchmark to complete the turning of the end face and the outer circle). Either way, the blank should be made to meet the specified requirements, and a high-precision hobbing positioning reference surface is required. 
1. Hob holder 2. Special tool holder 3. Turning tool 4. Fixture 5. Hobbing machine table
figure 1 
1. Mandrel 2. Fixture holder
figure 2