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<p>In order to further reveal the cooling efficiency of cryogenic medium and clarify their cooling capacity, the cooling effect of liquid nitrogen (LN<sub>2</sub>) injection was studied using the numerical simulation and experimental methods for 304 stainless steel thin-wall parts. Based on LN<sub>2</sub> splash impact, a simulation model about the cooling capacity of LN<sub>2</sub> and its injection angle was established. Stainless steel thin-wall parts milling under different cryogenic cooling of LN<sub>2</sub> was simulated by finite element. And a series of milling experiments with LN<sub>2</sub> cooling were executed in detail. The results show it is verified that near 40° LN<sub>2</sub> injection angle can achieve the best cooling effect and ability compared with flood cooling. Meanwhile, the lower cryogenic temperature will follow the greater stiffness for thin-walled parts. There causes all the greater milling resistance of stainless steel. When the milling depth is larger, that has a better cooling effect at LN<sub>2</sub> injection angle α<sub><i>n</i></sub> = 40° than that of 20° as well as the smallest milling deformation. Besides, the optimal injection angle and the minimum deformation can be inferred at α<sub><i>n</i></sub> = 45°. At both ends of thin-walled part, the maximum acceleration of 45mm/s<sup>2</sup> can be obtained at injection angle α<sub><i>n</i></sub> = 80°, but that is only 27mm/s<sup>2</sup> at α<sub><i>n</i></sub> = 40°. Injection angle α<sub><i>n</i></sub> = 40° can increase the spreading time of LN<sub>2</sub> compared to that of α<sub><i>n</i></sub> = 20° and achieve full boiling heat exchange. Therefore, an appropriate LN<sub>2</sub> injection angle can achieve a better cooling effect.</p>

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Numerical Simulation of Cooling Capacity for LN2 Injection Angle and its Influence on Milling Deformation of Stainless Steel Thin-Wall Part

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Yin Mao,
  • Yunxian Cui

摘要

In order to further reveal the cooling efficiency of cryogenic medium and clarify their cooling capacity, the cooling effect of liquid nitrogen (LN2) injection was studied using the numerical simulation and experimental methods for 304 stainless steel thin-wall parts. Based on LN2 splash impact, a simulation model about the cooling capacity of LN2 and its injection angle was established. Stainless steel thin-wall parts milling under different cryogenic cooling of LN2 was simulated by finite element. And a series of milling experiments with LN2 cooling were executed in detail. The results show it is verified that near 40° LN2 injection angle can achieve the best cooling effect and ability compared with flood cooling. Meanwhile, the lower cryogenic temperature will follow the greater stiffness for thin-walled parts. There causes all the greater milling resistance of stainless steel. When the milling depth is larger, that has a better cooling effect at LN2 injection angle αn = 40° than that of 20° as well as the smallest milling deformation. Besides, the optimal injection angle and the minimum deformation can be inferred at αn = 45°. At both ends of thin-walled part, the maximum acceleration of 45mm/s2 can be obtained at injection angle αn = 80°, but that is only 27mm/s2 at αn = 40°. Injection angle αn = 40° can increase the spreading time of LN2 compared to that of αn = 20° and achieve full boiling heat exchange. Therefore, an appropriate LN2 injection angle can achieve a better cooling effect.