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论文类型：期刊论文

发表时间：2016-09-01

发表刊物：INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：86

期号：1-4

页面范围：671-679

ISSN号：0268-3768

关键字：High-speed machining; Adiabatic shear fracture; Isolated segment; Fracture; Quick-stop device

摘要：Adiabatic shear fracture in serrated chip leads to isolated segment formation in high-speed machining with the further increase of cutting speed. An energy model of adiabatic shear band is built and investigated through high-speed machining tests and chip morphology examination. A quick-stop device designed to obtain chip roots in high-speed turning is applied. The adiabatic shear fracture process on considering the induced mechanism is investigated and the multi-stage physical model of adiabatic shear fracture is proposed through chip root morphology examination. The results show that adiabatic shear fracture in high-speed machining is a periodic process from energy convergence to release. The shear band collapses and results in isolated segments formation when the energy convergence in band exceeds the saturation limit. There are possibilities of utilizing the occurrence of adiabatic shear fracture to reduce the increased rate of stress, temperature, and energy and optimize the machinability in the chip formation aspect in high-speed machining.