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发表时间：2022-10-06

发表刊物：机械工程学报

所属单位：机械工程学院

卷号：53

期号：19

页面范围：73-82

ISSN号：0577-6686

摘要：Based on the simplified model of ultrasonic-assisted cutting for Nomex honeycomb core with straight knife,the dynamic force model for ultrasonic-assisted cutting is established based on brittle fracture theory.The relative motion relationships between the tool and the composites material are discussed in several cases.Analysis indicates that under different conditions there are two failure forms in breaking of the material,namely intermittent and continuous failure forms.Then the theoretical formula of the cutting force in cutting process is derived.The parameters of ultrasonic amplitude,forward angle of tools,feed rate and ultrasonic frequency are found to be of obvious influence on cutting force during the material cutting process.On the basis of theoretical analysis,the experiments of ultrasonic-assisted cutting Nomex honeycomb core are carried out.The results show that the ultrasonic amplitude in the feed direction and forward angle of tool have a great influence on the cutting force:As the ultrasonic amplitude in feed direction changes from 0 to 15μm,the forward angle of the tool changes from 15 ° to 45 °,the cutting force reduced by 70 ％～ 80％;Meantime,feed rate and ultrasonic frequency have less influence on cutting force:As the feed rate changes from 500 mm/min to 6000 ram/rain with a multiplication of 12 times,there is only a multiplication of 1.5 times with the cutting force.Compared with the case of 15 kHz,the cutting force reduced by 10％ to 30％ when the frequency is 35 kHz.The experimental results are in agreement with the theoretical analysis.

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