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Abstract
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Article Information:
A New Method for Machining Concave Profile of the Worms' Thread
R.A. Abdullah and T.A. Abu Shreehah
Corresponding Author: Tareq Abu Shreehah
Submitted: 2010 July, 03
Accepted: 2010 August, 27
Published: 2010 September, 10 |
Abstract:
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Research and development of wormgear drives have significantly focused on their geometrical
accuracy, loadability tests, and their wear resistance and efficiency. The research has been going on in several
directions. Individual method of problem solving is development new worm-gear sets and tools for their
manufacturing. In the present study, worms with concave profile of their thread have been considered. To avoid
the technological difficulties relevant to the application of special cutting tools for machining such gear sets,
a rigid incongruent generating pair consisting of a standard hob and toroidal tool has been developed for
processing the concave worm profile. The generating surface of the developed toroidal tool, which is essential
for the tool manufacturing, was modeled on the basis of hob-toroidal tool interaction. The proposed method
of modeling w as divided into three steps: first, the common surface for both hobbing and toroidal tools has been
found in terms of hyperboloid of revolution of one sheet, then, the matrix method of transforming the
coordinates, from the hob-axis reference frame to the toroidal tool-axis reference frame, has been utilized, and
finally, an equation described the generating surface of the toroidal tool has been derived and presented. By
using the proposed model and the obtained final equation the worm thread surface machined by the mentioned
tool can be defined and experimented.
Key words: Concave thread, generating surface, toroidal tool, worm-gear drive, , ,
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Cite this Reference:
R.A. Abdullah and T.A. Abu Shreehah, . A New Method for Machining Concave Profile of the Worms' Thread. Research Journal of Applied Sciences, Engineering and Technology, (6): Page No: 614-621.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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