| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 94 === This thesis investigates the grinding characteristics, including the wheel loading and wears during a grinding process, grinding coefficients and stability of different hardened steels and grinding parameters. The observation of wheel loading and wear are achieved by grinding experiments, and the relationships between the grinding force and ground length on the workpiece can be obtained. In the analysis of grinding stability, the convolution grinding force model and four mechanism of grinding system, including wheel contacting stiffness, machine stiffness and wheel and workpiece wear stiffness, are investigated. The process stiffness can be identified by the analytical nature of convolution grinding force model, and the stability of the grinding process can be evaluated by the identified process stiffness. By this analyzing procedure, the effects of different workpiece material and grinding parameters to the grinding stability can be analyzed and discussed.
The experiments showed that the grinding force increased steadily with the grinding length, because the blunt grits and wheel loading were produced during the grinding process. They also showed that the wheel wear would be more increased by higher specific grinding energy. In the stability analysis, this article compared different hardened steels, including roller steel provided by China steel corporation, SKH51 and SKD11, and found that among them. It was also found that the grinding depth does not have a significant effect on stability but higher workpiece feed resulted in higher workpiece wear stiffness.
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