Forming Quality Analysis of Mg-Al Composite Pipes of Multi-Pass Power Spinning

Abstract This paper describes the effect of pass ratio on the forming quality of magnesium-aluminum composite pipes formed by multi-pass spinning. Established by NX software, the finite element simulation model of 7075 aluminum alloy-ZM21 magnesium alloy composite pipes was imported into Simufact. Forming software for simulation analysis. Based on previous research, the appropriate spinning parameters were selected. When the total reduction is constant, the ratios of three different reductions are studied and the final stress-strain results are obtained by finite element software simulation. By analyzing the straightness, cylindricity, and wall thickness of magnesium-aluminum composite pipes, the influence law of different pass reduction ratios on the surface quality of composite pipes is obtained. By analyzing the stress distribution of the magnesium-aluminum composite pipes interface, the influence law of different pass reduction ratios on the interface bonding strength of composite pipes is obtained. The final results show that compared with the initial pass, the contact stress on the surface of the magnesium-aluminum pipes in the subsequent pass is much greater than that in the initial pass. In the subsequent passes, the contact stress of the final pass has little difference. When the final pass reduction decreases, the cylindricity and straightness of the composite pipes decrease, so the surface quality of the composite pipes depends on the final pass reduction. Therefore, in the actual production process, the intermediate pass reduction can be increased and the final pass reduction can be appropriately reduced. These results provide technical guidance for the selection and optimization design of the reduction ratio of multipass spinning of magnesium-aluminum bimetallic composite pipes.