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During the three-roll planetary rolling, contact region distribution between roller and workpiece is the basis of the calculation of the rolling power. In the process of rolling, the extension deformation along the rolling axis of the workpiece is inevitable, and the contact region distribution is affected directly. On the basis of existing research, considering the influence of axial extension deformation of workpiece in rolling, the function of the contact region distribution was obtained by theoretical analysis. The parameters of the rolling process were given, and the specific distribution of contact region was numerically simulated. Results show that the contact region between roller and workpiece becomes narrow under the influence of the axial extension deformation of the workpiece. The results are not only more consistent with the actual contact situation between roller and workpiece than that in existing research, but also show that the distribution is affected by the rolling constant, inclined angle, offset angle,rolling speed and feeding speed of workpiece as well as the original size of workpiece.
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