Abstract
Ultraprecision micromachining is a technology suitable to fabricate miniaturized and complicated 3-dimensional microstructures and micromechanisms. High geometrical precision and elevated surface finishing are both key requirements in several manufacturing sectors. Electronics, biomedicals, optics and watchmaking industries are some of the fields where micromachining finds applications. In the last years, the integration between product functions, the miniaturization of the features and the increasing of geometrical complexity are trends which are shared by all the cited industrial sectors. These tendencies implicate higher requirements and stricter geometrical and dimensional tolerances in machining. From this perspective, the optimization of the micromachining process parameters assumes a crucial role in order to increase the efficiency and effectiveness of the process. An interesting example is offered by the high-end horology field. The optimization of micro machining is indispensable to achieve excellent surface finishing combined with high precision. The cost-saving objective can be pursued by limiting manual post-finishing and by complying the very strict quality standards directly in micromachining. A micro-machining optimization technique is presented in this a paper. The procedure was applied to manufacturing of main-plates and bridges of a wristwatch movement. Cutting speed, feed rate and depth of cut were varied in an experimental factorial plan in order to investigate their correlation with some fundamental properties of the machined features. The dimensions, the geometry and the surface finishing of holes, pins and pockets were evaluated as results of the micromachining optimization. The identified correlations allow to manufacture a wristwatch movement in conformity with the required technical characteristics and by considering the cost and time constraints.
Highlights
The horology industry represents one of the major manufacturing sectors for micromachining
For completecampaign of 27 prototypes machining, was geometry evidencedemployed that the employment of the ness, it is important to underline that theit tool in the experimental highest depth of cut and feed per tooth induced to excessive burrs distribution
Campaign is unique, and the variability window of the process parameters is ascribable to the final geometry showed irregularities in the tests with fZ = 10 μm combined with
Summary
The horology industry represents one of the major manufacturing sectors for micromachining. All the parts have pockets, micro-holes and micro-pins to mechanically constrain the miniaturized components The micromachining of these features must comply with tight dimensional and geometrical tolerances. In this low feed rate and depth cut, combined with high cutting speed are suggested [30,31,32], This paper deals withofthe optimization of finishing operations in micromachining of but no bibliographic references concerning theoptimization processing ofprocess. Parameters set was selected by considering the time production necessary to fabricate each prototype
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