Abstract
We developed a processing technique to apply plastic deformation to solid bamboo impregnated with thermosetting resin. To prevent the forming defects such as incomplete filling during upset forgings, we investigated the factors that affect the deformability of the bamboo. We conducted compression tests of the bamboo impregnated with phenol-formaldehyde resin using flat dies. The die temperature and the presence or absence of the lubricant were varied to change the thermal softening/hardening conditions of the impregnated bamboo and the friction characteristics between the bamboo and the dies, respectively. The compressed bamboo samples extended in a perpendicular direction to the bamboo fibers, and the extension ratio (Et) was higher when a lubricant was compared to that in a no-lubricant condition. The change in the Et with temperature was different between the without- and with- lubricant conditions. The results suggest that the friction on the dies significantly affects the deformability of the sample with no lubricant; however, the effect of friction was smaller than that of the flow stress of the bamboo, when the lubricant was used. The polymerization speed of the impregnated resin in the bamboo is also an important factor that affects the deformability of the samples, especially under low-friction conditions. To form a thin and large or complex shape product via flow forming, it is preferable to compress at a low temperature at which the impregnated resin does not polymerize with friction minimized.
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This work was partially supported by Strategic Foundational Technology Improvement Support Operation (Sapoin) 2015 from Ministry of Economy, Trade and Industry (METI).
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Seki, M., Yashima, Y., Kiryu, T. et al. Deformability of bamboo impregnated with thermosetting resin in upset forging. Int J Mater Form 14, 261–270 (2021). https://doi.org/10.1007/s12289-020-01579-4
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DOI: https://doi.org/10.1007/s12289-020-01579-4