Abstract
In this chapter, precise micro-grinding machining was proposed to create regular and controllable micro-grooved array structures on the surface of mold cores for the mass production and fabrication of micro-structured polymer components by micro injection molding. First, the 3D topology and cross-sectional profiles of a micro-ground mold cores and micro-formed polymer with various microstructural parameters are presented. The surface roughness of the mold cores and polymers is then compared. Secondly, the relationship between the accuracy of the microbead-treated mould core and the fillability of the micro-structured injection polymer is investigated. Finally, the effect of micro injection molding parameters on the filling rate of micro-structures polymer were investigated. The results show that micro-structured polymers can be produced efficiently and rapidly using the proposed method. The experimental results show that the highest shape accuracy and filler level of the micro-structured polymer can be achieved at 4.05 μm and 99.30% respectively for a mold core with micro-grooves. It was found that the degree of filling of the micro-structured polymer increased approximately with the accuracy of the core processing. Injection pressure has the greatest influence on the degree of filling of the molded polymer, while melt temperature has the least effect.
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Acknowledgements
The work described in this chapter was supported by the National Natural Science Foundation of China (Grant No. 51805334), the International Science and Technology Cooperation Project of Shenzhen City (Grant No. GJHZ20190822091805371), and the Science and Technology Planning Project of Guangdong Province (Grant No. 2017A010102003).
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Lu, Y., Mou, X., Chen, F. (2023). Fabrication of Micro-structured Polymer Via Precision Grinding and Injection Molding. In: Zhang, G., Xu, B., Lu, Y., To, S. (eds) Fabrication of Micro/Nano Structures via Precision Machining. Springer, Singapore. https://doi.org/10.1007/978-981-99-1338-1_17
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DOI: https://doi.org/10.1007/978-981-99-1338-1_17
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