When rolling thread shaft in cross wedge rolling, forming quality of thread is affected by many process parameters such as the thread helix angle, which is a special and complex parameter. However, there is few study of the effect of the thread helix angle on thread shaft forming. In this paper how thread helix angle affects axial metal flow was analyzed from the perspective of rolling force and the forming process of thread shaft was simulated with different helix angles by the deform-3D software. Through the measurement of the point coordinates, the effect of the helix angle on the axial metal flow of rolled pieces was analyzed. Finally, the conclusion was obtained that helix angle causes the asymmetry of axial metal flow with small difference values for asymmetry and the axial metal flow of rolled pieces increases as the helix angle increases. The rolling thread segment can be ensured in the middle of rolled pieces by moving the blank a suitable distance in the reverse direction of the axial flow direction.
Based on the plastic bending theory, the influence of material properties fluctuations of pipeline steel on the air bending is discussed by the computer simulation technology and design of the orthogonal was adopted to define scientific simulation experiment scheme. Among the material properties, initial yield strength is the most critical issue. The relation of the initial yield strength, the key process parameter, punch penetration, and the tube forming quality was studied and the variation of bending angle after springback and forming force with the punch insertion was analyzed. The parameters prediction model, which was established by using RBF network technology, is proved rational and precise since the error between predicting results and simulation value is very small. The method can be used to optimize the relevant process parameters and to design the reasonable process scheme.
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