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17.7.5.3 Twist due to manufacturing: natural twist due to flank line crowning Cβ (generation grinding)
In the Modifications tab, you can select Twist due to manufacturing as a modification. This is a natural twist that occurs when flankline crowning is created on helical gears as part of the generation process on standard grinding machines. The resulting twist depends on the value Cβ of the flank line crowning, the helix angle and also the involute length. The calculation is performed using data provided by the company Gleason-Pfauter, in Ludwigsburg, Germany. The formula used here corresponds to equation 5.16 in Hellmann's dissertation [25]. Enter the value of the crowning to be ground, Cβ, in the Value column. The resulting twist is then determined during the calculation process, and is documented under Information. The generation grinding process always creates a negative twist.
Twist due to manufacturing can only be calculated if a generation grinding process is used. If a form grinding process is involved, different methods that are suitable for the particular process must be used to determine the resulting twist. Form grinding always generates a positive twist.
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发表于 2015-7-31 07:24
发表于 2021-3-16 11:36
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