Papers by Keyword: Area Effect

Abstract: Shape Memory Alloys (SMA) is mainly used in Microsystems because of its micro strain. A new kind of clamping device based on area effect stroke amplifier and driven by SMA wires is introduced in this paper. With the micro strain enlarged by stroke amplifier and pressure transmitted via closed pipeline, a greater displacement can be obtained to clamp the workpiece. This clamping device has prominent advantages in great stroke amplifying ratio and green aspect. Moreover, remote clamping and automatic control are easy to implement because of the high flexibility of fluid.

Abstract: This paper investigated the impact of area effect in the batch mode micro-EDM on shape accuracy and surface morphology of the machined microstructures, as well as electrode wear, using both the positive-type and the negative-type electrode arrays fabricated by the UV-LIGA process. Experimental results showed that ,with the increase of electrode-pair scale from Φ1mm, Φ2mm, Φ4mm to Φ8mm, the shape accuracy of the machined stainless steel microstructures increased, but the eroded microcavities of the machined area reduced in both the positive-type and the negative-type micro-EDM using the same electrical pulse parameters. It was also found that, with the same pulse energy and electrode-pair area, the electrode wear reduced as the electrode-couple area increased, and the wear ratio in the positive-type micro-EDM was larger than that in the negative-type micro-EDM.