MATEC Web Conf.
Volume 123, 20172017 The 2nd International Conference on Precision Machinery and Manufacturing Technology (ICPMMT 2017)
|Number of page(s)||6|
|Published online||21 September 2017|
Piercing and surface-crack defects in combination extrusion of fasteners
Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807 Taiwan
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Piercing or surface-crack defect occurs in combination-extruding the support pin. There has been so far insufficient knowledge in avoiding such forming defects in forming the similar products. In this paper, a combination-extrusion experiment, with various combinations of forward and backward extrusion ratios, was conducted to observe the occurrence of the defects. The result shows that the defects occur at low level of both forward extrusion ratio and backward extrusion ratio used in the combination-extrusion process. The low forming level causes the onset of insufficient plastic metal-flow, which is similar to that of inhomogeneous deformation in the unidirectional extrusion or drawing process. A forming limit diagram was constructed and can be used in the defect prediction for the future development of similar products.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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