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RISS 인기검색어
- 검색키워드
- 주제어 : · Axial ultrasonic-assisted grinding · Brittle fracture · Grinding force and grinding force ratio · Subsurface damage (검색결과 1 건)
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Yanyan Yan,Yafei Zhang,Bo Zhao,Junli Liu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.3
In this study, the surface formation and damage mechanism of hard-brittle materials in axial ultrasonic-assisted grinding (AUAG) were revealed using the grinding force and grinding force ratio. Theoretical analysis presented that the grinding force and grinding force ratio in AUAG are relatively small. AUAG is a machining method with a large tangential force and a small normal force, which can promote the removal of hard-brittle materials and reduce the surface and subsurface damage (SSD). Scratching and grinding tests of nano-ZrO 2ceramics were conducted to validate the theoretical analysis. The results demonstrated that the periodic tangential force under the AUAG promotes the nucleation and propagation of shallower lateral micro-cracks, thereby allowing the easier removal of hard-brittle materials. Additionally, the proportion of brittle fracture was less, and the surface roughness and maximum SSD depth were significantly small. Therefore, AUAG is a suitable ultra-precision machining technique for hard-brittle materials.
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