Blanking Clearance and Punch Velocity Effects on The Sheared Edge Characteristic in Micro-Blanking of Commercially Pure Copper Sheet

Didin Zakaria Lubis, Ichsan Ristiawan

Abstract


This study aims to identify the influences between clearance and punch velocity on the part edge quality of blanked parts. Experiments have been conducted using material copper, punch-die clearance and punch velocity variations. In order to determine the reachable punch-die clearance and punch velocity required for blanking. The quality of the part-edge characteristics shows that higher punch velocity and decreases clearance value can improve the part-edge quality, resulting in smaller burr height and rollover, and a larger shear zone. Furthermore, it could be observed that the part-edge quality improvement when blanking with high punch velocity is much more distinct for stele than for copper. According to blanking theory, this improvement was expected because copper have much higher heat conduction coefficients. Therefore, the heat dissipates faster and the desired stress relief effect does not take place to the same degree as for stele.

Keywords


Micro PunchClearance, Punch velocity, Copper.

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References


T. Masuzawa, “State of the Art of Micromachining,” Ann. te CIRP vol. 49/2/2000, vol. 49, no. 1, p. 473, 2000.

J. Jeswiet et al., “CIRP Journal of Manufacturing Science and Technology Metal forming progress since 2000,” vol. 1, pp. 2–17, 2008.

S. R. Schmid, “MANUFACTURING ENGINEERING Illinois Institute of Technology".

Y. Kibe, Y. Okada, and K. Mitsui, “Machining accuracy for shearing process of thin-sheet metals — Development of initial tool position adjustment system,” vol. 47, pp. 1728–1737, 2007.

B. Joo, S. Rhim, and S. Oh, “Micro-hole fabrication by mechanical punching process,” vol. 170, pp. 593–601, 2005.

K. Lange, “Handbook of Metal Forming -Society of Manufacturing Engineers.” McGraw-Hill Companies, 1985.

S. Ivana, Handbook of Die Design Second Edition. McGraw-Hill Companies, 2006.

H. Y. Chan and A. B. Abdullah, “Geometrical Defect in Precision Blanking / Punching : A Comprehensive Review on Burr Formation,” vol. 8, no. 9, pp. 1139–1148, 2014.

A. R. Razalia and Y. Qin, “A Review on Micro-manufacturing , Micro-forming and their Key Issues,” Procedia Eng., vol. 53, pp. 665–672, 2013.

Z. Tekiner, M. Nalbant, and H. Gürün, “An experimental study for the effect of different clearances on burr, smooth-sheared and blanking force on aluminium sheet metal,” Mater. Des., vol. 27, no. 10, pp. 1134–1138, 2006.

C. Husson, J. P. M. Correia, L. Daridon, and S. Ahzi, “Finite elements simulations of thin copper sheets blanking: Study of blanking parameters on sheared edge quality,” J. Mater. Process. Technol., vol. 199, no. 1, pp. 74–83, 2008.




DOI: http://dx.doi.org/10.17977/um016v1i22017p053

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