Advanced Devices and Technologies for Chip Breaking of Turning Tool Inserts:A review
In the process of metal cutting,when processing high toughness materials or using improper cutting parameters,it is easy to generate ribbon or spiral shaped continuous chips.These type of chips continuously curl without breaking and are prone to entanglement.It leads to unstable material deformation and fluctuation of cutting force.Serious chip entanglement will scratch the machined surface,deteriorate the surface quality and affect the service life of machined parts.Based on the mechanism of continuous chip formation and fracture,developing chip breaking techniques and devices can achieve periodic chip breaking,eliminate or suppress chip entanglement.The high quality and high performance cutting can be achieved.Firstly,the typical motion state of chip and fracture mechanism are analyzed.Secondly,the methods of insert chip breaker,micro-textured cutting tool,high-pressure jet,optimization of cutting process parameters and special chip breaker of turning tool inserts are described respectively.The working principles and chip breaking effects of these chip breaking devices and techniques are compared and analyzed,and their advantages and disadvantages are discussed.Finally,the theory and application development of chip breaking research are prospected in the aspects of chip breaking criterion,chip breaking structure design of indexable inserts,chip breaking process simulation model and chip breaking technology innovation optimization.
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