Multi-wedge Cross Wedge Rolling (MCWR) is an advanced technology in forming long axial parts, and it does not have the disadvantages of Single-wedge Cross Wedge Rolling (SCWR).However, it is extremely important to realize the regularity of the displacement on the end-section of the rolled parts in MCWR due to the complexity of its forming mechanism. In this paper, based on the method of the displacement on the end-section of the rolled parts in SCWR, the rules of the displacement on the end-section of a typical rolled part in MCWR were investigated theoretically, and the curve on the end -section of the rolled part in MCWR were analyzed.Based on the curve, the regularity of metal flowing and the characteristic of forming for the typical rolled part in each phase by MCWR were analyzed. It is of high value in studying the forming mechanism and designing mould and technics in MCWR.

The edge shape problem of strip has great influence on the shape control precision, so it is extremely necessary to establish the high-precision strip edge shape model. Based on the theoretical analysis and the practical engineering, a new high-precision shape detection model, which consists of wide channels in the middle of detection roll and narrow channels on both sides, is established to analyse the problem of strip edge shape. Instance data showed that the strip lateral thickness difference was directly related with the shape state of strip, and the strip edge coverage rate and the strip deviation amount had important influences on the shape detection precision, the pattern recognition accuracy and the shape control effect, so the strip edge shape model has become one of the key factors to improve industrial application effect of the shape closed-loop control system in the present situation.

Aiming at solving the problem of the complicated structure and difficult 3D modeling of cross wedge rollors, the article does some research on the 3D cross wedge die based on STL documents. In accordiance with the data of parametric cross wedge die, adopting the STL document format, aotomatically construct the 3D shape of the model, this method can increase the efficiency of designing the modeling of cross wedge rollors; since most CAM, CAE systems can read STL document, this method can speed up the CAE and CAM systems in order to provide 3D geomatrical model quickly.

For the difficult problem of the flange-forming prefabricated hole size design for tee pipe, based on the principle that in the deformation zone the length of bore plain wire does not change, make the establishment of a mathematical model of the prefabricated hole flange-forming of tee pipe, and by value solving methods to solve the mathematical model, establish a software system for prefabricated hole flange-forming of equal diameter tee pipe. In order to verify the reliability of this article to build the mathematical model and its solution, taking engineering for example, apply the method of finite element simulation to verify the mathematical model and the solving system, and the results show that the mathematical model constructed in this paper can relatively accurately make calculation of prefabricated hole size of flange-forming of equal diameter tee pipe.