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Effect of cryogenic cooling on adiabatic shearing in processing titanium alloy

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Abstract

The adiabatic shear band (ASB) is easily generated in high-speed cutting, as well as the serrated chip. The main factors are high temperature and elastoplastic instability. An adiabatic shear energy dissipation model was established and analyzed. A series of milling experiments were systematically conducted with cryogenic and conventional cooling. Meanwhile, the characteristics of the workpiece and chip were investigated and compared. The results show that under the conventional cooling, at the cutting speed of 150 m/min, the ASB and generated serrated chip can be produced with the high-frequency oscillation cutting force. In cryogenic, the chip is serrated at all kinds of cutting speed, especially high speed, and the sawtooth is regular with no obvious ASB. The serrated chip formation is mainly associated with brittle cutting in cryogenics. When the cutting parameters are unchanged, the energy dissipation is mainly determined by the main cutting force and shear strength. Compared with the conventional cooling process, the energy dissipation in cryogenic is more than the former one, and the ability of producing instantaneous adiabatic shear is weaker. Furthermore, due to the instantaneous cold brittleness of liquid nitrogen, the generating condition of the ASB is not satisfied in the shear zone.

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Acknowledgements

This research was partially supported by the natural science foundation project of Liaoning province (No. 20170540787), the Liaoning key fund of national natural science fund (No. U1608251), and the basic science and research project of Liaoning province (No. LG201711).

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Authors and Affiliations

  1. School of Mechanical Engineering, Shenyang Ligong University, Shenyang, 110159, China

    Fengbiao Wang

  2. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116024, China

    Yongqing Wang

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  1. Fengbiao Wang
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Correspondence to Fengbiao Wang.

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Wang, F., Wang, Y. Effect of cryogenic cooling on adiabatic shearing in processing titanium alloy. Int J Adv Manuf Technol 102, 3587–3596 (2019). https://doi.org/10.1007/s00170-019-03380-3

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