| Summary: | 博士 === 國立中央大學 === 機械工程學系 === 102 === Spiral polishing mechanism is the technology of employing a high-speed turning screw rod to drive the abrasive to achieve the purpose of polishing the workpiece surface. The fast-turning screw rod drives the abrasive to move upward along the groove of the rod to keep polishing the workpiece in a recycling movement. Compared with traditional polishing methods, the long moving path of the abrasive helps achieve better polishing quality. Besides, the recycling movement of the abrasive not only effectively reduces the cost and the quantity of abrasive, but also removes the burrs in a fast, efficient, and economical way. Therefore, it is a superior method to reach good machining effect.
In this study, the magneto-assisted polishing was combined with spiral polishing mechanism. With the magnetism employed in the magneto-assisted polishing, the polishing force of the abrasive in spiral polishing was enforced and thus the polishing effect was improved. Actually, the abrasive played a crucial role in spiral polishing mechanism. In the present study, a new kind of magnetic abrasive was developed by coating each particle with a layer of magnetic particles. Moreover, the elasticity of the abrasive eased the kinetic energy generated from the polishing process on the workpiece surface, with the function of reducing the great impact during the polishing and preventing the effect of over-polishing. When this technology was applied to the polishing of the inner wall of the bore, the results of the experiment showed that with the parameter variables of magnetic flux density of 90mT, Sic size of 4μm, Silicone oil viscosity of 2000mm2/s, magneto-elastic abrasive concentration of 60%, machining gap of 0.6 mm , and the spindle revolution speed at 4000 rpm, the surface roughness (Ra) was lowered from 0.90 μm. to 0.0541 μm. in 20 minutes, at the improvement rate of 94%. The polishing time was significantly shortened and the optimal polishing effect was obtained.
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