Abstract
In this paper, two approaches to calculate the tooth thickness error (TTE) of straight beveloid gear by tilt-type gear shaper were proposed. The first calculation approach of TTE was established by considering the change of pitch circle radius during the gear slotting process. The analytical tooth surface model of straight beveloid gear was derived by inclined gear shaping, and the tooth surface point set was obtained. Then, another calculation methodology of TTE was established based on the analytical straight beveloid gear model. Two approaches were employed to calculate the TTE of internal and external straight beveloid gear, respectively. And they were employed to validate each other, and the results show a good consistency. The influences of design parameters on TTE was analyzed. Results show that the internal/external straight beveloid gears have a convex/concave TTE along the tooth width direction while cutting by tilt-type gear shaper, which makes the tooth thickness of the heel and toe sides of beveloid gear thinned/thickened, respectively. The TTE of internal and external beveloid gear both increase with the increase of design cone angle, and decrease with the increase of modulus and number of teeth. For the same macro gear design parameters, the TTE of external beveloid gear is smaller than that of internal beveloid gear. The results of the two approaches show good consistency at the middle of tooth surface. The maximum difference between the results of two approaches gradually increases away from the middle of tooth surface, and it is positively correlated with the value of TTE.
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Abbreviations
- \(\delta \) :
-
Cone angle of beveloid gear
- \({\omega }^{c}\) :
-
Angular velocity of slotting cutter
- \(\omega \) :
-
Angular velocity of gear blank
- \({Z}_{c}\) :
-
Tooth numbers of slotting cutter
- Z :
-
Tooth numbers of gear blank
- \({m}_{n}\) :
-
Modulus of normal section
- \({m}_{t}\) :
-
Modulus of transverse section
- \({\alpha }_{n}\) :
-
Pressure angle of normal section
- \({\alpha }_{t}\) :
-
Pressure angle of transverse section
- \({\alpha }_{t}^{\prime}\) :
-
Pressure angle at any circle of the gear blank
- \({\alpha }_{tp}^{{\prime}}\) :
-
Pressure angle at pitch circle of the gear blank in the processing section
- \({h}_{an}^{\ast}\) :
-
Addendum coefficient of normal section
- \({h}_{at}^{\ast}\) :
-
Addendum coefficient of transverse section
- \({r}_{p}\) :
-
Working pitch circle radius of gear blank
- \({r}_{p}^{c}\) :
-
Working pitch circle radius of slotting cutter
- r :
-
Reference circle radius of gear blank
- \({r}_{t}^{c}\) :
-
Reference circle radius of slotting cutter
- \({r}_{bt}\) :
-
Base circle radius of gear blank
- \({r}_{bt}^{c}\) :
-
Base circle radius of slotting cutter
- \(ym\) :
-
Radial displacement of rack cutter
- \({x}_{M}\) :
-
Modification coefficient of beveloid gear in the middle section
- \({x}_{t}\) :
-
Modification coefficient of beveloid gear in the section of interest
- B :
-
Distance from the section of interest to the middle section
- \({x}_{t}^{c}\) :
-
Modification coefficient of the slotting cutter cutting section
- s :
-
Tooth thickness at reference circle
- \({e}^{c}\) :
-
Reference circle space width of the slotting cutter
- \({e}_{p}^{c}\) :
-
Pitch circle space width of the slotting cutter
- \({r}_{K}\) :
-
Radius of any circle between tip circle and root circle of the machined gear
- \({h}_{k}\) :
-
Tooth depth coefficient
- \({s}_{K}\) :
-
Tooth thickness at any circle of the gears processed by the rack cutter
- \({s}_{K}^{c}\) :
-
Tooth thickness at any circle of the gears processed by the slotting cutter
- \({s}_{K}^{er}\) :
-
Tooth thickness error at any circle of the gears
- \({\varphi }_{c}\) :
-
Rotated angles of the slotting cutter
- \({\varphi }_{g}\) :
-
Rotated angles of the gear blank
- \({n}_{i}^{k}\) :
-
Common normal vector of the contact point of the unit k in coordinate \({S}_{i}\)
- \({v}_{i}^{k}\) :
-
Velocity vector of the contact point of the unit k in coordinate \({S}_{i}\)
- \({x,y,z}_{k}\) :
-
X/Y/Z-Axis value of the unit k tooth surface
- \({n}_{x,y,z}^{c}\) :
-
X/Y/Z-Axis components of the common normal vector of the cutting edge
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Acknowledgements
The authors would like to thank the National Key R&D Program of China (Grant No. 2019YFB2004700)
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Zhu, F., Song, C., Zhu, C. et al. Tooth Thickness Error Analysis of Straight Beveloid Gear by Inclined Gear Shaping. Int. J. Precis. Eng. Manuf. 23, 429–443 (2022). https://doi.org/10.1007/s12541-022-00625-2
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DOI: https://doi.org/10.1007/s12541-022-00625-2