Abstract
In this research, a method employing micro-extrusion was designed to produce the micro-scaled barrel-shaped parts with complex geometrical features to study the feasibility of the proposed microforming method and its grain size effect on the formability of the complicated internal features in terms of deformation behavior, material evolution, accuracy of dimensions and final components quality. The results reveal that the deformation behavior is highly affected by grain size and becomes unpredictable with increased grain size. In addition, assembly parameters including feature dimension, tolerance and coaxiality also vary with grain size, and the variation of grain size needs to be accommodated by different assembly types, viz., clearance fit or transition fit. From the microstructural evolution aspect, it was identified there were two dead zones and four shear bands, and the formation of these deformation zones was barely affected by the variation in grain size. Though bulges, cracks, and fracture induced voids were observed on the surface of the final components, tailoring the microstructure of the working material with finer grains could significantly avoid these defects. This study advances the understanding of forming microparts by extrusion processes and provides guidance for microforming of similar microparts.
Similar content being viewed by others
References
Zheng JY, Shi S, Fu MW (2020) Progressive microforming of pin-shaped plunger parts and the grain size effect on its forming quality. Mater Des 187:108386. https://doi.org/10.1016/j.matdes.2019.108386
Raja CP, Ramesh T (2021) Influence of size effects and its key issues during microforming and its associated processes—a review. Eng Sci Technol 24:556–570
Barbier C, Thibaud S, Picart P (2008) Size effects on material behaviour in microforming. Int J Mater Form 1:439–442
Zhang B, Meng W (2021) Effects of punch geometry and grain size in micron scale compression molding of copper. Mater Des 206:109807. https://doi.org/10.1016/j.matdes.2021.109807
Xu Z, Peng L, Bao E (2018) Size effect affected springback in micro/meso scale bending process: experiments and numerical modeling. J Mater Process Tech 252:407–420
Chan WL, Fu MW (2012) Studies of the interactive effect of specimen and grain sizes on the plastic deformation behavior in microforming. Int J Adv Manuf Tech 62:989–1000
Özdemir İ (2014) Grain statistics induced size effect in the expansion of metallic micro rings. Int J Mech Sci 87:52–59
Amelirad O, Assempour A (2019) Experimental and crystal plasticity evaluation of grain size effect on formability of austenitic stainless steel sheets. J Manuf Process 47:310–323
Fang ZJ, Wang ZY, Zhou XG et al (2015) Grain size effect of thickness/average grain size on mechanical behaviour, fracture mechanism and constitutive model for phosphor bronze foil. Int J Adv Manuf Tech 79:1905–1914
Rajenthirakumar D, Sridhar R, Abenethiri R et al (2016) Experimental investigations of grain size effects in forward microextrusion. Int J Adv Manuf Tech 85:2257–2264
Zheng Q, Shimizu T, Yang M (2017) Grain size effect on mechanical behavior of thin pure titanium foils at elevated temperatures. Int J Mech Sci 133:416–425
Zheng JY, Wang J, Fu MW (2021) Experimental and numerical study of the size effect on compound meso/microforming behaviors and performances for making bulk parts by directly using sheet metals. J Manuf Process 66:506–520
Schubert A, Jahn SF, Müller B (2014) Modular tool concept and process design for micro impact extrusion. Precis Eng 38:57–63
Kada O, Wang Z, Miyanishi K et al (2020) Evaluation of anti-galling ability of zinc phosphate coating by backward extrusion of cylindrical cup. J Mater Process Tech 285:116765. https://doi.org/10.1016/j.jmatprotec.2020.116765
Zhang B, Meng WJ (2020) Scaling anomaly in the mechanical response in microscale reverse extrusion of copper. J Micro Nano-Manuf 8(1):010910. https://doi.org/10.1115/1.4046043
Ghassemali E, Tan MJ, Jarfors AE et al (2013) Optimization of axisymmetric open-die micro-forging/extrusion processes: an upper bound approach. Int J Mech Sci 71:58–67
Cao J, Krishnan N, Wang Z et al (2004) Microforming: experimental investigation of the extrusion process for micropins and its numerical simulation using RKEM. J Manuf Sci Eng 126:642–652
Jiang CP, Chen PS, Erisov Y et al (2022) Microforming a miniature cup-shaped internal gear using a cold lateral extrusion process. Metals 12(5):826. https://doi.org/10.3390/met12050826
Jäger A, Habr S, Tesař K (2016) Twinning-detwinning assisted reversible plasticity in thin magnesium wires prepared by one-step direct extrusion. Mater Des 110:895–902
Dong X, Chen F, Chen S et al (2015) Microstructure and microhardness of hot extruded 7075 aluminum alloy micro-gear. J Mater Process Tech 219:199–208
Fu MW, Chan WL (2013) Micro-scaled progressive forming of bulk micropart via directly using sheet metals. Mater Des 49:774–783
Chan WL, Fu MW, Yang B (2012) Experimental studies of the size effect affected microscale plastic deformation in micro upsetting process. Mater Sci Eng A 534:374–383
Chan WL, Fu MW (2013) Meso-scaled progressive forming of bulk cylindrical and flanged parts using sheet metal. Mater Des 43:249–257
Peng L, Lai X, Lee HJ et al (2009) Analysis of micro/mesoscale sheet forming process with uniform size dependent material constitutive model. Mater Sci Eng A 526:93–99
Meng B, Fu MW, Fu C et al (2015) Ductile fracture and deformation behavior in progressive microforming. Mater Des 83:14–25
Huang J, Xu Z, Peng L et al (2020) An experimental study on a rapid micro imprinting process. J Mater Process Tech 283:116716. https://doi.org/10.1016/j.jmatprotec.2020.116716
Acknowledgments
The authors would like to acknowledge the funding support to this research from the National Natural Science Foundation of China (Grant No. 51835011), the project of ZE1W from The Hong Kong Polytechnic University, and the General Research Fund of Hong Kong Government (Grant No. 15223520).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
About this article
Cite this article
Hu, D., Fang, J., Zeng, F. et al. Grain size effect on the assembly quality of micro-scaled barrel formed by microforming. Adv. Manuf. 12, 19–32 (2024). https://doi.org/10.1007/s40436-023-00456-y
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s40436-023-00456-y