Analysis On The Metal3D Plastic Deformation Of The Cross Shear Rolling

As the rapid development of domestic communications industry food electronics andother industries, the demand of market for all types thin strips of metal rapid rise. Most ofthe current production of cold rolled thin strip using cluster mill, but its costs high,structure complex and installation and debugging difficult. While the cross shear rollingtechnology can significantly reduce the rolling force so that we can produce extra-thinstrips, and it is low in cost and power consumption. But because of its deformationmechanism is unclear, which result in the control of shape in the rolling process is hard tograsp, so have not been widely used. This requires people to get a better sense of therolling process, in traditional plane-strain rolling theory, lateral metal flow is notconsidered, this causes the distribution of the3D displacements and stress field of metalsin the rolling process can not be analyzed and solved, so the research on3D rolling theorybecomes particularly important. About3D rolling theoretical model, although manyresearch methods have been proposed, and a lot of progress has been made, however, thestudy on the metal3D deformation theory of the cross shear rolling is not perfect.The subject investigated of this article is the cross shear rolling process of coldrolling strip, taking into account the uneven distribution of flow velocity, stress and strainalong the thickness direction based on the theory of strip element method. Subsequentlyinfers the neutral point coordinates formula and the distribution formula of unit rollingforce along the contact arc in the forward slip zone, the asynchronous zone and thebackward slip zone. Then it can establish mechanics parameters of the cross shear rollingsuch as the rolling force, the stress and so on, this article establishes the3D metallicplastic deformation model apply to the cross shear rolling,Based on the above theoretic model, this paper simulates the rolling process of thecross shear rolling in the factory. It is obtained the distribution of the speed, the stress, thestrain rate, the unit rolling force, the front tension stress, the back tension stress, the exitlateral displacement and the unit force of friction on the top and bottom surfaces of rolledpiece along the contact arc, in order to analyze its deformation mechanism. It also analysesvarious process parameters such as the reduction ratio, the asymmetry ratio and so on affecting the rolling force, the equivalent stress and strain, and the influence of differententry thickness on the rolling pressure. Simulations with differential speed cold rolled thinstrip show that, the computed results of the distribution of the force parameters are good inaccord with the experimented results, which proves that the calculation results are reliable.