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Hardening effect on machined surface for precise hard cutting process with consideration of tool wear

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Abstract

During hard cutting process there is severe thermodynamic coupling effect between cutting tool and workpiece, which causes quenching effect on finished surfaces under certain conditions. However, material phase transformation mechanism of heat treatment in cutting process is different from the one in traditional process, which leads to changes of the formation mechanism of damaged layer on machined workpiece surface. This paper researches on the generation mechanism of damaged layer on machined surface in the process of PCBN tool hard cutting hardened steel Cr12MoV. Rules of temperature change on machined surface and subsurface are got by means of finite element simulation. In phase transformation temperature experiments rapid transformation instrument is employed, and the effect of quenching under cutting conditions on generation of damaged layer is revealed. Based on that, the phase transformation points of temperature under cutting conditions are determined. By experiment, the effects of cutting speed and tool wear on white layer thickness in damaged layer are revealed. The temperature distribution law of third deformation zone is got by establishing the numerical prediction model, and thickness of white layer in damaged layer is predicted, taking the tool wear effect into consideration. The experimental results show that the model prediction is accurate, and the establishment of prediction model provides a reference for wise selection of parameters in precise hard cutting process. For the machining process with high demanding on surface integrity, the generation of damaged layer on machined surface can be controlled precisely by using the prediction model.

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Authors and Affiliations

  1. State Engineering Laboratory of High Efficiency Cutting and Tool, Harbin University of Science and Technology, Harbin, 150080, China

    Caixu Yue, Xianli Liu, Jing Ma, Zhaojing Liu, Fei Liu & Yongheng Yang

Authors
  1. Caixu Yue
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  2. Xianli Liu
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  3. Jing Ma
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  4. Zhaojing Liu
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  5. Fei Liu
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  6. Yongheng Yang
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Corresponding author

Correspondence to Caixu Yue.

Additional information

Supported by National Natural Science Foundation of China (Grant Nos. 51105119, 51235003)

YUE Caixu, born in 1982, is an associate professor. He received his doctor degree on machinery manufacture from Harbin University of Science and Technology, China, in 2013. His research interests include hard cutting mechanics and control of cutting process.

LIU Xianli, born in 1961, is a PhD supervisor and a professor at Harbin University of Science and Technology, China. He received his doctor degree on machinery manufacture from Harbin Institute of Technology, China, in 1999.

MA Jing, born in 1989, is a PhD candidate at Harbin University of Science and Technology, China. Her research interests include hard cutting mechanics and simulation.

LIU Zhaojing, born in 1957, is currently an engineer at Harbin University of Science and Technology, China.

LIU Fei, born in 1989, is a master candidate at Harbin University of Science and Technology, China. Her research interest is finite element simulation technology of cutting process.

YANG Yongheng, born in 1987, is a master candidate at Harbin University of Science and Technology, China. His research interest is formation mechanism of hard cutting metamorphic layer.

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Yue, C., Liu, X., Ma, J. et al. Hardening effect on machined surface for precise hard cutting process with consideration of tool wear. Chin. J. Mech. Eng. 27, 1249–1256 (2014). https://doi.org/10.3901/CJME.2014.0922.154

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  • DOI: https://doi.org/10.3901/CJME.2014.0922.154

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