12Cr1MoVG alloy seamless pipe has the advantages of high specific strength and stiffness, good castability and electromagnetic shielding, easy environmental protection and so on. It is a metal engineering material with low density. Its structural parts are widely used in automobile, aerospace, electronic communication and so on. The plasticity of magnesium alloy is poor, and the plastic forming process of magnesium alloy is less. At present, the main forming method is extrusion. In recent years, the research on rolling technology of magnesium alloy plate and strip has been paid attention to and gradually transferred to industrial production. However, the research on the production technology of magnesium alloy seamless pipe is still blank.

Through the study of cross rolling and spinning forming process of magnesium alloy materials, this paper attempts to put forward a production process of magnesium alloy seamless pipe suitable for the plastic characteristics of magnesium alloy, so as to provide a new technical means for its product production and application.

This paper uses MSC Marc software simulates the forming process of magnesium alloy three roll combined piercing rolling. The main process parameters affecting the threading process of magnesium seamless alloy pipe, such as roll shape, roll speed, feed angle and rolling temperature, are analyzed. Through simulation and theoretical analysis, the variation curves of stress, strain and rolling force at different roll speeds are obtained. The process parameters used in the threading process of magnesium alloy seamless tube blank were preliminarily drawn up.

In this paper, the spinning process of magnesium alloy seamless tube blank is simulated by using the finite element analysis software ANSYS / LS-DYNA. Combined with the theoretical analysis, the pass thinning rate and feed ratio in the spinning process are qualitatively analyzed, the effects of ball working angle, spindle speed and spinning temperature on the spinning process are discussed, and the process parameters that can be used for experimental research are preliminarily formulated.