Gear Cutting in a Globoid Pair with an Initial Cylindrical Involute Gear

Abstract Gear hobs are the most widely and frequently used gear cutting tools. During the time passed between the moment of invention (Schiele, 1876) and the present, gear hobs reached a considerable evolution regarding the geometry, the profile of the edge, the relieving technologies finalizing in the latest constructive and design solutions. This paper deals with the calculus of the edge profile in the case the basic worm of the hob has involute helicoid surfaces. In order to obtain a constant grinding allowance on the relief faces of the gear hob teeth it is necessary to compute the edge of the roughing relieving cutter. The equations are deduced considering that the provenience involute worm is a one teethed helical gear with shifted profile. The presented mathematical model proves that linearizing the relieving cutter profile is not an adequate solution if aspiring to higher precision.

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Discussion on “Developments in gear cutting and finishing processes” at the Leicester Section of the Institution

Journal of the Institution of Production Engineers ◽

10.1049/jipe.1946.0017 ◽

1946 ◽

Vol 25 (7) ◽

pp. 211

Author(s):

Blore ◽

Everest ◽

Jefferies ◽

Hall ◽

Brown ◽

...

Keyword(s):

Gear Cutting ◽

Finishing Processes

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Development of an Intelligent CAD System for Involute Cylindrical Gear Cutting Tools

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.532.249 ◽

2014 ◽

Vol 532 ◽

pp. 249-252

Author(s):

Ying Hua Liao ◽

Gao Jun Liu ◽

Xiang Guo Sun

Keyword(s):

Expert Knowledge ◽

Cutting Tools ◽

3D Models ◽

Tool Design ◽

Cylindrical Gear ◽

Intelligent Cad ◽

Forward Reasoning ◽

Cad System ◽

Gear Cutting ◽

2D And 3D

An intelligent CAD system for Involute cylindrical gear cutting tools is developed by VC++ and SQL server, and it includes four modules, such as user interface, instance query, intelligent gear tool design and database. The intelligent gear tool design is the key to the intelligent CAD system, and it is based on the forward reasoning production system, and as the Intelligent reasoning technology is used for gear tool design, a lots of expert knowledge could be made full use of. The design results by the developed intelligent CAD system are more reasonable than those by a traditional CAD system, and the efficiency and quality of the gear tool design also could be improved. The developed intelligent CAD system supports both 2D and 3D models, which can lay foundation for CAD/CAE/CAM integration of gear cutting tools.

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Geometrical design of skew conical involute gear drives in approximate line contact

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/09544062jmes1340 ◽

2009 ◽

Vol 223 (9) ◽

pp. 2201-2211 ◽

Cited By ~ 11

Author(s):

S H Wu ◽

S J Tsai

Keyword(s):

Power Transmission ◽

Design Approach ◽

Line Contact ◽

Contact Sensitivity ◽

Axis Ratio ◽

Edge Contact ◽

Involute Gear ◽

Surface Durability ◽

Gear Drives ◽

Conical Gear

A novel design for skew conical involute gear drives in approximate line contact is proposed. Such a drive has a contact ellipse with a large major-to-minor-axis ratio, which allows it to overcome the weakness of conical gear drives for application in power transmission. This gearing design approach is characterized by reduced edge contact sensitivity and increased surface durability. The edge contact sensitivity that can arise with this kind of gear drive due to assembly or manufacturing errors is evaluated by analysing the value of the shift of the line of action caused by such errors. The surface durability is evaluated by calculating the Hertz stress. Some guidelines are developed based on the analysis of the influence of the gearing parameters on the edge contact sensitivity and the surface durability made possible using this design approach for conical gear drives in the approximate line contact. The guidelines are summarized and, finally, a practical example is given to demonstrate the feasibility of the approximate line contact design.

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Research on S-gear design, manufacturing and measuring based on NC machining center

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture ◽

10.1177/0954405420981346 ◽

2020 ◽

pp. 095440542098134

Author(s):

Shao-ying Ren ◽

Yan-zhong Wang ◽

Yuan Li

Keyword(s):

Convex Surface ◽

Coordinate Measuring Machine ◽

Nc Machining ◽

Tooth Profile ◽

Numerical Control ◽

Machining Center ◽

Involute Gear ◽

Measuring Machine ◽

Gear Contact ◽

Nc Machining Center

This article presents a method of design, manufacturing, and measuring S-gear. S-gear is a kind of gear whose tooth profile is an S-shaped curve. The sine (cosine) gear, cycloid gear, polynomial gear, and circular arc gear are all S-gears in essence. In the S-gear transmission, the concave surface of one gear and the convex surface of the other gear contact each other. Therefore, the power transmitted by S-gear is much larger than that of the convex-convex-contact involute gear. Some scholars have studied the characteristics of S-gear, but few have explored its manufacturing. In this article, the Numerical Control (NC) machining technology of S-gear is studied in detail for its industrial application. The polynomial curve is used to construct the tooth profile of the S-gear based on the Gear Meshing Theory. The mathematical model of polynomial S-gear is established, by which involute gear can be represented as a special S-gear. The steps of generating NC codes are described. Then, the S-gear sample is processed with an NC machining center. Finally, the sample is measured with a Coordinate Measuring Machine (CMM), and the measurement results show that the accuracy of the S-gear processed by the NC machining center reaches ISO6. This research provides a feasible approach for the design, manufacturing, and measuring of S-gear.

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