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<p>AISI H13 steel has a wide range of applications. However, the high-efficiency and high-quality machining of hardened H13 steel still faces severe challenges. The simulation model and milling experiment method are investigated using PCBN tools under the clean milling conditions of dry, cold air and liquid nitrogen (LN<sub>2</sub>) cooling. The clean milling mechanism and machined surface integrity are explored. The simulation results are consistent with the experimental results. Therefore, the modified simulation model is suitable for hard clean milling processes. The milling temperature, tool surface adhesion, and machined surface residual compressive stress under cold air conditions are significantly lower than those under dry milling conditions. Under LN<sub>2</sub> cooling conditions, the curling radius of the chip is minimal. The machined surface roughness is reduced by 15.6%. Moreover, the best surface morphology and maximum surface residual stress are obtained under LN<sub>2</sub> cooling conditions. In general, PCBN has the longest tool life under cold air condition. The high surface quality of H13 steel is obtained under LN<sub>2</sub> cooling conditions.</p>

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Effect of cooling medium on clean milling mechanism and surface integrity in hard milling process

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Chengli Jing,
  • Guangming Zheng,
  • Wenfeng Yang,
  • Kun Tan,
  • Xiang Cheng,
  • Huaqiang Zhang

摘要

AISI H13 steel has a wide range of applications. However, the high-efficiency and high-quality machining of hardened H13 steel still faces severe challenges. The simulation model and milling experiment method are investigated using PCBN tools under the clean milling conditions of dry, cold air and liquid nitrogen (LN2) cooling. The clean milling mechanism and machined surface integrity are explored. The simulation results are consistent with the experimental results. Therefore, the modified simulation model is suitable for hard clean milling processes. The milling temperature, tool surface adhesion, and machined surface residual compressive stress under cold air conditions are significantly lower than those under dry milling conditions. Under LN2 cooling conditions, the curling radius of the chip is minimal. The machined surface roughness is reduced by 15.6%. Moreover, the best surface morphology and maximum surface residual stress are obtained under LN2 cooling conditions. In general, PCBN has the longest tool life under cold air condition. The high surface quality of H13 steel is obtained under LN2 cooling conditions.