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Technical Brief

Calculation Method for Rocking Die Motion Track in Cold Orbital Forging

[+] Author and Article Information
Xinghui Han

Hubei Key Laboratory of Advanced Technology
for Automotive Components,
Wuhan University of Technology,
Wuhan 430070, China
e-mail: hanxinghuihlp@126.com

Xinchang Zhang

Hubei Key Laboratory of Advanced Technology
for Automotive Components,
Wuhan University of Technology,
Wuhan 430070, China
e-mail: zhangxinchang_1990@126.com

Lin Hua

Hubei Key Laboratory of Advanced Technology
for Automotive Components,
Wuhan University of Technology,
Wuhan 430070, China
e-mail: hualin@whut.edu.cn

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received October 10, 2014; final manuscript received June 9, 2015; published online September 9, 2015. Assoc. Editor: Gracious Ngaile.

J. Manuf. Sci. Eng 138(1), 014501 (Sep 09, 2015) (9 pages) Paper No: MANU-14-1518; doi: 10.1115/1.4030855 History: Received October 10, 2014

Abstract

In cold orbital forging, the rocking die performs complex motions on the components and the intervention between them cannot emerge, otherwise the components cannot be shaped successfully. Calculating the rocking die motion track is essential to determining whether there is intervention between the rocking die and components. Thus, this study aims to comprehensively investigate the rocking die motion track in cold orbital forging. For this purpose, an analytical model for calculating the rocking die motion track is first established. Then a universal motion track equation that can denote any geometry and kinematics relationships between the rocking die and components is obtained using this analytical model. To verify the validity of this motion track equation, an experimental study is conducted. The result shows that the calculated rocking die motion track is consistent with the experimental one. According to this valid motion track equation, the characteristics of the rocking die motion track are revealed. Finally, to apply the calculated rocking die motion track for analyzing the intervention between the rocking die and components, two case studies are examined.

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Copyright © 2016 by ASME
Topics: Forging , Geometry , Rotation
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References

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Figures

Fig. 1

Principle of cold orbital forging of ring workpiece (R and r represent outer and inner diameters, respectively, of ring workpiece)

Fig. 2

Four types of motions of the rocking die: (a) Circular motion, (b) straight line motion, (c) spiral motion, and (d) planetary motion

Fig. 3

Analytical model for calculating rocking die motion track: (a) Analytical model for calculating rocking die motion track in 3D coordinate system xyz and (b) geometry relationships of projection points in 2D coordinate system xOy

Fig. 4

Lag/advance relationships between rocking die and component

Fig. 5

Measurement diagram of rocking die motion track: (a) T630 cold orbital forging press and (b) measurement device

Fig. 6

Comparison between calculated and experimental motion track of measurement point in rocking die

Fig. 7

Rocking die motion track with ɛ > 1: (a) Rocking die motion track in x–z and y–z planes (ɛ = 1.03, θ = 2π) and (b) rocking die motion track in 3D coordinate system xyz (ɛ = 1.03, θ = 10π)

Fig. 10

Effect of ɛ on rocking die motion track with ɛ > 1

Fig. 11

Effect of ɛ on rocking die motion track with ɛ < 1

Fig. 13

Experimental cold orbital forged gear (top and bottom surfaces are nonrotatory)

Fig. 14

Comparison between rocking die motion tracks and nonrotatory top surface of gear

Fig. 15

Experimental cold orbital forged gear (top surface is rotatory and bottom surface is nonrotatory)

Fig. 16

Comparison between rocking die motion tracks and rotatory top surface of gear with ɛ=1

Fig. 17

Comparison between rocking die motion tracks and rotatory top surface of gear with ɛ≠1

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