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A novel approach to minimizing material loss for computer numerical control flank-regrinding of worn end mills

Frontiers of Mechanical Engineering 2023年第3期18卷 219-231页

作者： Liming WANG Yang FANG Jianping YANG Jianfeng LI School of Mechanical Engineering Shandong UniversityJinan 250061China National Demonstration Center for Experimental Mechanical Engineering Education Shandong UniversityJinan 250061China Key Laboratory of High Efficiency and Clean Mechanical Manufacture(Ministry of Education) Shandong UniversityJinan 250061China

Flanks of end mills are prone to wear in a long machining *** is widely used in workshops to restore the flank to an original-like ***,the traditional method involves material waste by trial and error and dramatically decreases the potential ***,over-cut would happen to the flutes of worn cutters in the regrinding processes because of improper wheel *** study presented a new approach to planning the wheel path for regrinding worn end mills to minimize material loss and recover the *** planning,a scaling method was developed to determine the maximum size of the new cutter according to the similarity of cutter shapes before and after ***,the wheel path is first generated by envelope theory to regrind the worn area with a four-axis computer numerical control grinder according to the new size of ***,a second regrinding strategy is applied to recover the flute shape over-cut in the first ***,the proposed method is verified by an *** showed that the proposed approach could save 25%of cutter material compared with the traditional method and ensure at least three regrinding *** work effectively provides a general regrinding solution for the worn flank with maximum material-saving and regrinding period.

关键词： flank-regrinding worn end mill wheel position and orientation material loss over-cut

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Improving resolution of superlens based on solid immersion mechanism

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Chinese Physics B 2023年第6期32卷 21-26页

作者：郝占磊周杨阳吴贝刘益能陈焕阳 Institute of Electromagnetics and Acoustics and Department of Physics College of Physical Science and TechnologyXiamen UniversityXiamen 361005China

Super-resolution imaging with superlens has been one of the fundamental research topics. Unfortunately, the resolution of superlens is inevitably restrained by material loss. To address the problem, we introduce the solid immersion mechanism into the slab superlens and the cylindrical superlens. The proposed solid immersion slab superlens(SISSL) and the solid immersion cylindrical superlens(SICSL) can improve the resolution by converting evanescent wave to propagating wave using high refractive index materials. From the perspective of applications, the cylindrical superlens with finite cross section and the ability of magnification or demagnification has more advantages than the slab superlens. Therefore,we focus on demonstrating analytically the super-resolution imaging of SICSL. Due to the impedance mismatching caused by solid immersion mechanism, the whispering gallery modes(WGMs) are excited between SICSL and the air *** clarify the excitation conditions of WGMs and analyze their influence on the imaging quality of SICSL. The SISSL and SICSL may pave a way to apply in lithography technique and real-time biomolecular imaging in future.

关键词： super-resolution imaging material loss solid immersion cylindrical superlens whispering gallery modes

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