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Research Papers: Design of Direct Contact Systems

Cutting Tool Parameters of Cylindrical Skiving Cutter With Sharpening Angle for Internal Gears

[+] Author and Article Information
Ichiro Moriwaki

Kyoto Institute of Technology,
Goshokaido-Cho, Matsugasaki,
Sakyo-ku,
Kyoto 606-8585, Japan
e-mail: ichi@mech.kit.ac.jp

Tsukasa Osafune

Graduate School of KIT,
Goshokaido-Cho, Matsugasaki,
Sakyo-ku,
Kyoto 606-8585, Japan
e-mail: osahune@pml.mech.kit.ac.jp

Morimasa Nakamura

Kyoto Institute of Technology,
Goshokaido-Cho, Matsugasaki,
Sakyo-ku,
Kyoto 606-8585, Japan
e-mail: nakamura@mech.kit.ac.jp

Masami Funamoto

Kashifuji Works Ltd.,
28 Kamota, Kamitoba,
Minami-ku,
Kyoto 601-8131, Japan
e-mail: funamoto@kashifuji.co.jp

Koichiro Uriu

Kashifuji Works Ltd.,
28 Kamota, Kamitoba,
Minami-ku,
Kyoto 601-8131, Japan
e-mail: kouichirou-uriu@kashifuji.co.jp

Takanori Murakami

Kashifuji Works Ltd.,
28 Kamota, Kamitoba,
Minami-ku,
Kyoto 601-8131, Japan
e-mail: takanori-murakami@kashifuji.co.jp

Eiri Nagata

Aisin Seiki Co., Ltd.,
2-1 Asahi-machi,
Kariya,
Aichi 448-8650, Japan
e-mail: e-nagata@ogawa.aisin.co.jp

Nobuaki Kurita

Aisin Seiki Co., Ltd.,
2-1 Asahi-machi,
Kariya,
Aichi 448-8650, Japan
e-mail: nkurita@ped.aisin.co.jp

Tomokazu Tachikawa

Aisin Seiki Co., Ltd.,
2-1 Asahi-machi,
Kariya,
Aichi 448-8650, Japan
e-mail: t_tachi@ped.aisin.co.jp

Yoshinori Kobayashi

Nachi-Fujikoshi Corp.,
1-1-1 Fujikoshi-Honmachi,
Toyama 930-8511, Japan
e-mail: yoshinori.kobayashi.si@nachi.com

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received June 12, 2016; final manuscript received November 25, 2016; published online January 12, 2017. Assoc. Editor: Hai Xu.

J. Mech. Des 139(3), 033301 (Jan 12, 2017) (11 pages) Paper No: MD-16-1442; doi: 10.1115/1.4035432 History: Received June 12, 2016; Revised November 25, 2016

Gear skiving is a technique proposed a long time ago for cutting internal gears at high productivity. Until recently, many problems have prevented its widespread use. With current technological breakthroughs, however, skiving is drawing attention again. The present paper describes cutting tool parameters, which could be vital for the optimum design of skiving cutters. Cutting tool parameters include depth of cut, rake angle, and clearance angle at each point on a cutting edge. They continuously change with progress in the cutting process. The parameters are defined on the basis of an oblique cutting model, which is a three-dimensional extension of an orthogonal cutting model. The example calculations in this study revealed the following features: Although rake angles almost always remain negative, clearance angles remain positive. At the points where clearance angles are large, depths of cut are large, but rake angles are small (i.e., largely negative). The decrease in shaft angle between the cutter and working blank axes increases depths of cut and clearance angles, while reducing rake angles (i.e., yields largely negative rake angles). Meanwhile, the increase in cutter tool face offset; i.e., the axial position of a tool face measured from a reference point on the conjugate pinion, narrows the area where depths of cut and clearance angles are small, but rake angles become largely negative. These parameters could be useful for evaluating tool cutting efficiencies in internal gear skiving.

Copyright © 2017 by ASME
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References

Figures

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Fig. 1

Coordinate systems rigidly connected to internal gear Sg (Og-xgygzg), pinion Sp (Op-xpypzp), and frame SF (OF-xFyFzF)

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Fig. 2

Conjugate pinion and concepts of determination of a cutter lead

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Fig. 3

Determination of cutting edges

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Fig. 4

Tooth profile modifications of a skiving cutter: (a) leading side and (b) trailing side

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Fig. 5

Cutting edge motion in the gear coordinate system Sg with a tooth space of the internal gear

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Fig. 6

Tooth forms of the cut internal gear in terms of their deviations from a true involute helicoid: (a) leading side and (b) trailing side

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Fig. 7

Oblique cutting model for defining cutting tool parameters: (a) depth of cut, (b) rake angle, and (c) clearance angle

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Fig. 8

Relative motion of a cutting edge to a working blank in a skiving process which generates a groove on its surface

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Fig. 9

Rolled out groove and its changes in instantaneous depths of cut over the entire groove

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Fig. 10

Rolled out groove and its changes in instantaneous rake angles over the entire groove

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Fig. 11

Rolled out groove and its changes in instantaneous clearance angles over the entire groove

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Fig. 12

Schematic diagram of a cutting wedge motion

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Fig. 13

Distributions of the depths of cut in the generated groove for different shaft angles of: (a) 5, (b) 10, and (c) 20 deg

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Fig. 14

Distributions of rake angles in the generated groove for different shaft angles of: (a) 5, (b) 10, and (c) 20 deg

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Fig. 15

Distributions of clearance angles in the generated groove for different shaft angles of: (a) 5, (b) 10, and (c) 20 deg

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Fig. 16

Distributions of the depths of cut in the generated groove for different tool face offsets of: (a) 26, (b) 36, and (c) 46 mm

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Fig. 17

Histograms of depths of cut with a class interval of 1 μm in the generated groove for different tool face offsets

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Fig. 18

Histograms of rake angles with a class interval of 1 deg in the generated groove for different tool face offsets

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Fig. 19

Histograms of clearance angles with a class interval of 1 deg in the generated groove for different tool face offsets

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