Study on Calculation Method of Press Straightening Stroke Based on Straightening Process Model


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It is difficult to determine straightening stroke precisely for automatic straightening machines. The existing calculation method of straightening stroke is based on straightening curvature equation. Because the initial curvature is obtained by curve fitting method, the method is inconvenient to use and its accuracy is not well. In this paper, a method to calculate straightening stroke based on straightening process model is put forward. So the mathematic load-deflection model of straightening process must be established at first. The straightening process model for shafts is developed according to the elastic-plastic mechanics theory. By using the model, the straightening stroke can be calculated directly according to the initial deflection of the bent part. It is advantageous to use and to decrease errors. Comparing with FEM results and experimental results, the calculation results by the model are exact and the errors are small. So the validity and the accuracy of the method are verified. It will be helpful to the development of automatic straightening machines.



Key Engineering Materials (Volumes 340-341)

Edited by:

N. Ohno and T. Uehara




J. Li and G. L. Xiong, "Study on Calculation Method of Press Straightening Stroke Based on Straightening Process Model", Key Engineering Materials, Vols. 340-341, pp. 1345-1350, 2007

Online since:

June 2007




[1] N.K. Das Talukder and A.N. Singh: J. of Eng. for Industry Vol. 113(1991), pp.224-227.

[2] M.H. Qin, Z. Zh. Ke and Sh.R. Jiang: Chinese J. of Mech. Eng. Vol. 33(1997), pp.48-53.

[3] Zh. Hua, Ch.M. Han and Sh.R. Jiang: Heavy Machinery No. 5(2001), pp.35-38.

[4] H.X. Gong, T.H. Yan and J.L. Wang: J. of Harbin Eng. Univ. Vol. 23(2002), pp.116-119.

[5] J. Li, H.J. Zou and G.L. Xiong: Key Engineering Materials Vol. 274-276(2004), pp.475-479.

[6] P. Chui: Straightening Theory and Parameters Calculation (Mech. Industry Press, China 1994).