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Study on the mechanical and thermal parameters of PBX during the vertical extrusion charging process

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Abstract

To tackle challenges of man-machine contact, manual operation, and low degree of mechanical automation in the charging process of traditional polymer bonded explosive (PBX), we adopted a vertical extrusion charging process to realize continuous extrusion charging of the slurry into missiles. In this work, the screw structures were optimized via simulation software after slurry physical property analysis, as well as the influence of the parameters including speed and temperature on the process was further explored. The results indicated that, compared with the pineapple head structure featuring a high shear function, the conventional three-piece screw structure maintains the moderate fluctuation in viscous heating of the slurry, which is suitable for stable and safe delivery of high-sensitivity slurries. Meanwhile, an appropriate outlet size φ and barrel cone angle θ contributes to pressure distribution manipulation in the flow path, and a relatively high output was obtained at 30 mm and 1°, respectively. Additionally, the adjustment of process parameters such as speed and temperature is conducive to reducing occurrence probability of local hot spots and restraining deformation of screw blade structures, the balance between output and process hazard was achieved.

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Data availability

The data that support the findings of this study are available on request from the corresponding author, Wang, upon reasonable request.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 12102194, 22105103 and 22005144), the Natural Science Foundation of Jiangsu Province (BK20200471), and China Postdoctoral Science Foundation (No. 2020M673527 and 2021M691580).

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Correspondence to Su-Wei Wang or Wei Jiang.

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Lin, GM., Wang, SW., Xiao, L. et al. Study on the mechanical and thermal parameters of PBX during the vertical extrusion charging process. J Polym Res 30, 225 (2023). https://doi.org/10.1007/s10965-023-03612-x

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