0
Research Papers: Design of Direct Contact Systems

Gear Flank Modification Using a Variable Lead Grinding Worm Method on a Computer Numerical Control Gear Grinding Machine

[+] Author and Article Information
Zhang-Hua Fong

Chair Professor
Mechanical Engineering;
President,
National Chung-Cheng University,
168, University Road,
Min-Hsiung, Chia-yi 621, Taiwan
e-mail: imezhf@ccu.edu.tw

Gwan-Hon Chen

Department of Mechanical Engineering,
National Chung-Cheng University,
168, University Road,
Min-Hsiung, Chia-yi 621, Taiwan
e-mail: mr.taroz@gmail.com

1Corresponding author.

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received March 8, 2016; final manuscript received June 14, 2016; published online June 30, 2016. Assoc. Editor: Qi Fan.

J. Mech. Des 138(8), 083302 (Jun 30, 2016) (10 pages) Paper No: MD-16-1195; doi: 10.1115/1.4033919 History: Received March 08, 2016; Revised June 14, 2016

Tooth crowning of a ground helical gear is usually done by adjusting the radial feed with respect to the axial feed of the grinding worm on the modern CNC gear grinding machine. However, when the amount of crowning and the helical angle of the gear are large, this method always results in a twisted tooth flank. Hence, in this paper, we propose a tooth flank crowning method for helical gears, which uses a diagonal (combined tangential and axial) feed on a grinding machine with a variable lead grinding worm (VLGW) obtained by adjusting the axial feed of the dressing disk with respect to the rotation angle of the grinding worm. Since all the required corrective motions for the proposed VLGW method are existing CNC controlled axes on modern gear grinding machines, it can easily be implemented without extra cost to modify the grinder hardware. Three numerical examples are presented to show the validation of the proposed method and its ability to reduce tooth flank twist even in the case of a large helical angle, with a particularly significant reduction on a crowned helical gear.

FIGURES IN THIS ARTICLE
<>
Copyright © 2016 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Definition of axes on a gear grinding machine [20]

Grahic Jump Location
Fig. 2

Coordinate system of the schematic generation mechanism for grinding worm dressing

Grahic Jump Location
Fig. 3

EGB of a CNC gear grinding machine [8]

Grahic Jump Location
Fig. 4

Coordinate system of the schematic generation mechanism for gear grinding

Grahic Jump Location
Fig. 5

Normal deviation topography for the tooth surface of work gear: (a) digitized as a grid mesh on work gear tooth surface and (b) normal deviation topography for work gear

Grahic Jump Location
Fig. 6

Tooth flank sensitivity topographies for small changes in the design variables, δ=−0.01

Grahic Jump Location
Fig. 7

Tooth surface deviation topography modified by second-order radial feed, example 1

Grahic Jump Location
Fig. 8

Tooth surface deviation topography modified by second-order radial feed, example 1

Grahic Jump Location
Fig. 9

Tooth contact analysis for example 1; gear 1 is modified by the radial feed method, and gear 2 is a standard involute gear

Grahic Jump Location
Fig. 10

Tooth surface deviation topography modified by VLGW, example 2

Grahic Jump Location
Fig. 11

Tooth contact analysis for example 2; gear 1 is modified by the VLGW method, and gear 2 is a standard involute gear

Grahic Jump Location
Fig. 12

Target tooth surface modification topology, example 3

Grahic Jump Location
Fig. 13

Tooth surface deviation topography by VLGW, example3

Grahic Jump Location
Fig. 14

Tooth contact analysis for example 3; gear 1 is modified by the VLGW method with combined crowning, and gear 2 is a standard involute gear

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In