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Cooling Effects of Cold Mist Jet with Transient Heat Transfer on High-Speed Cutting of Titanium Alloy

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Abstract

High cutting temperature will lead to a short tool life and a poor machining quality during titanium alloy machining. High efficiency cooling methods are always required to reduce the cutting temperature. In this paper, heat transfer experimental platform was set up and one-dimension heat transfer model was established to get critical heat flux (CHF) used to evaluate the cooling capacity of the cooling methods. The effect of cold mist jet (CMJ) was evaluated by transient heat transfer tests and titanium alloys cutting experiments, comparing with cold air jet, flood cooling and minimum quantity lubricant. The experimental results revealed that CMJ with a high CHF has a stronger cooling capacity than other cooling methods and has greatly reduced the cutting temperature in high-speed cutting of titanium alloys. And tool life and surface quality have been both improved with CMJ. This paper offered a way for evaluating the cooling effects of different cooling methods with heat transfer experiments.

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Abbreviations

CHF:

Critical heat flux

CMJ:

Cold mist jet

c p :

Specific heat (J/(kg °C))

l :

Length of the specimen (mm)

m :

Total time intervals

MQL:

Minimum quantity lubricant

q :

Heat flux (W/mm2)

q CHF :

Critical heat flux (W/mm2)

TC4:

Ti–6Al–4V

TC9:

Ti–6.5Al–3.5Mo–2.5Sn–0.3Si

α :

Thermal diffusivity (m2/s)

λ :

Thermal conductivity (W/m °C))

λ s :

Tool cutting edge inclination (°)

ρ s :

Density (kg/m3)

τ :

Cooling cycle (s)

θ :

Temperature (°C)

θ 0 :

Initial average temperature (°C)

ϕ :

Tool diameter (mm)

δq(0):

Initial heat flux (W/mm2)

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Acknowledgements

The work is supported by National Natural Science Foundation of China (No. 51475298)

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  1. School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, People’s Republic of China

    Qinglong An & Jiaqiang Dang

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Correspondence to Qinglong An.

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An, Q., Dang, J. Cooling Effects of Cold Mist Jet with Transient Heat Transfer on High-Speed Cutting of Titanium Alloy. Int. J. of Precis. Eng. and Manuf.-Green Tech. 7, 271–282 (2020). https://doi.org/10.1007/s40684-019-00076-7

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