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Proceedings Paper

Experimental study on fabricating micro monolithic tungsten probing ball for micro-CMM
Author(s): Zhi-Wei Wang; Kuang-Chao Fan; Rui-Jun Li; Wei Gong
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Paper Abstract

Three-dimensional measurement of microstructures requires a 3-D microprobe with small probing ball as well as appropriate nanopositioning and nanomeasuring machines. An electric arc melting method is presented in this paper, which could fabricate the monolithic micro-spherical tip on the tungsten wire. Based on the principles of electrode discharging energy absorption and the surface tension phenomenon, a micro sphere is formed at the needle-shape tip of the tungsten wire. The model of dynamic arc discharging is established to analyze the process of sphere forming. Experiment results reveal that a spherical tip about 60 μm in diameter having less than 1 μm roundness error could be achieved on a 100 μm diameter tungsten wire with the selection of proper process parameters, such as the discharging voltage, discharging time and discharging gap. Quality of the probe is mainly determined by the electro-discharge conditions which affect the solidification force and thermal conductivity. The monolithic microprobe can be used in the micro coordinate measurement machines (Micro-CMMs) to allow the measurement of micro grooves possible.

Paper Details

Date Published: 31 January 2013
PDF: 7 pages
Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 87594W (31 January 2013); doi: 10.1117/12.2014809
Show Author Affiliations
Zhi-Wei Wang, Hefei Univ. of Technology (China)
Kuang-Chao Fan, Hefei Univ. of Technology (China)
National Taiwan Univ. (Taiwan)
Rui-Jun Li, Hefei Univ. of Technology (China)
Wei Gong, Hefei Univ. of Technology (China)

Published in SPIE Proceedings Vol. 8759:
Eighth International Symposium on Precision Engineering Measurement and Instrumentation
Jie Lin, Editor(s)

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