The Effect of Forming Diameter and Rotational Speed on Characterization of Formed Tubes by Spinning Process

Authors

Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

10.22044/jsfm.2025.16131.3969

Abstract

The spinning process is a common forming process used in the production of various products. It involves shaping sheets and tubes to create industrial products and sizing the connections in tubes. The purpose of this research is to investigate the effects of the final forming diameter and rotational speed on the twist angle, microstructure, hardness, strength, and the weldability in the spinning process of tubes. The spinnig process was analytically and experimentally evaluated, and the results were investigated using ANOVA analysis. The experiments were conducted using three different diameters and rotational speeds, and the response surface method was used to design the experiments. The analysis of the results revealed that the final forming diameter, or plastic strain, has a significantly greater effect on the mechanical properties and microstructure of the material compared to the rotational speed. An increase in rotational speed and forming diameter leads to a greater twist angle in the tubes. Higher rotational speeds and plastic strain result in increased contact and frictional forces, which cause the temperature to rise within the specimens. Increasing temperature results in grain growth, reduced work hardening, and consequently, a decrease in the material's strength and hardness. At a constant speed, a 25% increase in diameter results in a 47% decrease in hardness and strength. Additionally, using a rotational speed of 1000 rpm and a final diameter of 18 mm can increase the grain size up to three times the initial value and produce a maximum twist angle of 48⁰ in the sample.

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Main Subjects


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