Abstract
A novel and effective method to fabricate the bimetallic composite tube was proposed using a KOBO extrusion technique with an oscillating die. Compared with the traditional extrusion, KOBO extrusion enabled to induce high-frequency deformation path changes under the combined action of extrusion force and torsion torque. The numerical simulations of KOBO extrusion were conducted at extrusion velocities of 1, 2, 3, and 4 mm·s−1 and rotation frequencies of 2.5, 5, 8, and 10 Hz. The thickness uniformity coefficient and ratio of runoff were newly proposed as two indexes to evaluate the dimensional uniformity and stability of extruded bimetallic composite tubes. The results showed that KOBO extrusion had obvious advantages in reducing the extrusion load, narrowing the deformation zone, and simultaneously increasing the forming temperature. Both layers of extruded tube by the KOBO extrusion had more even thickness with lower thickness uniformity coefficients. The ratio of runoff for extruded tube was very close to its initial value of billet, which indicated that the KOBO extrusion enabled to form bimetallic composite tube with presumptive stable mechanical property. By comprehensive analysis of the impact of rotation frequency and extrusion velocity on reducing the total power consumption and increasing the power conversion parameter, it was recommended that KOBO extrusion selected a lower rotation frequency and a higher extrusion velocity under the premise of guaranteeing forming quality of the bimetal composite tube.
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Funding
The authors greatly acknowledge the financial support by the National Natural Science Foundation of China (No. 51805023, No. 52175285), Beijing Natural Science Foundation (No. 3184056), and Fundamental Research Funds for the Central Universities (FRF-IDRY-20–024, FRF-TP-20-009A2).
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L.Y Qian: conceptualization, methodology, investigation, writing — original draft, writing — reviewing and editing; Z.G Cui: software, data curation, investigation, writing — original draft; C.Y Sun: supervision, writing — review and editing; S. Geng: software; Z.H Sun: supervision.
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Qian, L., Cui, Z., Sun, C. et al. Investigation of deformation compatibility and power consumption during KOBO extrusion of bimetallic composite tube. Int J Adv Manuf Technol 118, 3477–3486 (2022). https://doi.org/10.1007/s00170-021-08608-9
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DOI: https://doi.org/10.1007/s00170-021-08608-9