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Modeling of cutting force in micro-milling considering asymmetric tool wear

Abstract

The asymmetric tool wear caused by the tool runout significantly affects the cutting force in micro-milling. In this study, an improved cutting force model considering asymmetric tool wear is constructed for predicting the micro-milling force. Firstly, by analyzing the effect of asymmetric tool wear on uncut chip thickness (UCT), shear/ploughing force, and friction force in the flank wear region, the analytical micro-milling force model considering asymmetric tool wear is derived. Secondly, the multiple parameters in the model are determined by the proposed laser measurement, wear image detection, and mechanical parameter identification methods. Finally, the cutting force and tool wear experiments are designed to validate the proposed model. Experimental results show that the established cutting force model improves the accuracy of cutting force prediction by 6.36% compared with the conventional cutting force model without considering the asymmetric wear.

article Article

date_range 2024

language English

link Link of the paper

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Wang Weisu

Tang Yanling

Guo Xuhong

Zhang Kedong

Liu Tongshun

Wang Chengdong

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Featured Keywords

Micro milling

Cutting force

Tool runout

Asymmetrical tool wear

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

link Link of the paper

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