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Self-bending extrusion molding of distorted channels

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Abstract

Using an integrated profile extrusion and bending forming process with a streamlined extrusion die, a new self-bending extrusion molding technology is proposed with an axis-distorted variable channel. By designing the streamlined extrusion die structure of the distorted central axis, the metal was made to flow non-uniformly in the die cavity, thereby directly extruding a bent profile. The central axis of the streamlined extrusion die is described by a trigonometric function and a Gaussian function. A numerical simulation was applied to analyze the metal flow pattern, equivalent strain, and strain-rate distribution during the self-bending extrusion process. The influences of the extrusion velocity and the addition of a bearing on the self-bending deformation profiles were investigated. During the extrusion process, the streamline at the center of the billet could describe the overall flow of the metal in the die cavity, and the distance between the point on the end face of the die outlet and the center of the die outlet directly determined the degree of extrusion and bending. The greater the distance was, the larger was the degree of bending. The metal strain on the convex edge of the die was greater than that on the concave edge of the die, with the extruded profile always bending toward the concave edge. The strain rate of the metal changed the fastest near the most convex point of the die. As the extrusion velocity increased or more bearings were added, the radius of curvature of the extruded profile increased nonlinearly.

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Acknowledgments

This work was supported by Research Program supported by Natural Science Foundation of Shandong Province (Project Number ZR2017MEE036) and Zibo City School City Integration Development Project (Project Number 2017ZBXC205).

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Correspondence to Guangming Zhu.

Additional information

Fanlei Min received his B.E. in Metallurgy Engineering from the Shandong University of Technology (SDUT) in 2017. His research interests focus on the metal plastic forming process and die technology.

Huiping Liu obtained a Bachelor’s in Mechanical Ddesign and Manufacturing and Automation from Qilu University of Technology in 2018. She studies at Shandong University of Technology majoring in Mechanical Engineering. Her research interests focus on the metal plastic forming process and die technology.

Guangming Zhu obtained his Ph.D. from the Yanshan University (YSU) in 2004. He is currently a Professor and Doctoral Supervisor of Shandong University of Technology (SDUT), among other important directorships. His team’s research interests are metal plastic forming equipment, process and automation, in the fields of strip rolling, seamless steel tube forming, incremental roll forming and steel final forming.

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Min, F., Liu, H., Zhu, G. et al. Self-bending extrusion molding of distorted channels. J Mech Sci Technol 35, 1945–1953 (2021). https://doi.org/10.1007/s12206-021-0412-8

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  • DOI: https://doi.org/10.1007/s12206-021-0412-8

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