ABSTRACT
The development in a significant way of cold metal forming processes for very small mechanical components is limited by the understanding of geometric and material effects due to size reduction. Cylinder upsetting tests have been used to observe the so-called size effects in microforming. In this study, a set of experiments is performed where the diameter of the cylinder is scaling down from 5 mm to 1 mm. Cylinder upsetting tests were conducted by using a specific tool system for cold forging of micro parts, which have been developed in our laboratory. Compression tests were carried out by reducing the height of the cylinder by 70% at a constant rate of 0.03 mm/s and without lubricant. During the tests, the loading force is measured and the load-displacement curve can be plotted. The material parameters were identified by an inverse method.
REFERENCES
F.K. Chen and J.W. Tsai. A study of size effect in micro forming with micro hardness tests. Journal of Materials Processing Technology, 177:146–149, 2006.
M. Geiger, M. Kleiner, R. Eckstein, N. Tiesler, and U. Engel. Microforming. In 51st General Assembly of CIRP, volume 50(2), pages 445–462, 2001.
R. Kals, F. Vollertsen, and M. Geiger. Scaling effects in sheet metal formng. In Proc. of SHE-MET’96, 1996.
M. Qasmi, P. Delobelle, F. Richard, and A. Bosseboeuf. Effect of the residual stress on the determination through nanoindentation technique of the young’s modulus of w thin deposit on sio2/si substrate. Surface and Coatings Technology, 200:4185–4194, 2006.
F. Vollertsen, Z. hu, H. Schulze Niehoff, and C. Theiler. State of the art in micro forming and investigations into micro deep drawing. Journal of Materials Processing Technology, 151:70–79, 2004.
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Barbier, C., Thibaud, S. & Picart, P. Size effects on material behaviour in microforming. Int J Mater Form 1 (Suppl 1), 439–442 (2008). https://doi.org/10.1007/s12289-008-0089-x
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DOI: https://doi.org/10.1007/s12289-008-0089-x