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Experimental and numerical investigation on thin sheet metal roll forming process of micro channels with high aspect ratio

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Abstract

Traditional punch and die stamping process are not capable of fabricating micro channels with high aspect ratio due to stress concentration and large thickness reduction. A thin sheet metal roll forming process using involute gears as rollers was proposed as a method to fabricate micro channels with high aspect ratio in this paper. Corresponding relations of gear-rollers and formed channel’s geometrical morphology were firstly established as designing guidelines. Then, process characteristics, material deformation behavior, and process mechanism were studied by experiments and simulation. Micro channels with aspect ratios up to 1.0 was formed with thickness reduction lower than 18.7% using 0.1-mm SS316L metal sheets. And both experiments and simulation reveal that thickness reduction can be further lowered down by reducing friction. The forming process of a micro channel consists of two chronological states-forming stage and quitting stage which, respectively, determines the formability and dimension accuracy. Furthermore, process parameters and assembly errors were demonstrated to have great influences on the process’ formability. This paper provides designing guidelines and process mechanism for thin sheet metal roll forming process as a promising method to fabricate micro channels with high aspect ratio.

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Funding

This work was carried out within the project supported by the National Natural Science Foundation of China (No. 51522506). It was also supported National Key Research and Development Program of China (2017YFB0102803).

Author information

Correspondence to Jihui Huang.

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Huang, J., Deng, Y., Yi, P. et al. Experimental and numerical investigation on thin sheet metal roll forming process of micro channels with high aspect ratio. Int J Adv Manuf Technol 100, 117–129 (2019). https://doi.org/10.1007/s00170-018-2606-5

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Keywords

  • Micro channels
  • High aspect ratio
  • Roll forming process
  • Thin sheet metal