超高强度钢立铣工件温度分析及对加工表面质量的影响

doi:10.7527/S1000-6893.2014.0261

Abstract

Abstract:

300M steel is chosen for the research object, which is the typical difficult-to-cut material in aviation industry. Microstructure changes are judged in milling based on the workpiece temperature. Then the main factors affecting the quality of the machined surface are also analyzed under different cutting conditions. Firstly, moving heat source method is applied to the milling process. The workpiece temperature model of end milling is established considering the flank rubbing effect. The temperature model is confirmed by the temperature measuring experiment and the error is less than 10%. Secondly, Temperature model is used to analyze the temperature variation on the workpiece surface over time, as well as the distribution along the depth into workpiece. The influences of processing parameters and tool wear on the surface temperature rise are studied. Finally, the quality of machined surface in physical level such as residual stress and microhardness is analyzed with different cutting conditions according to the test data. The results show that within the range of processing parameters studied, workpiece temperature is not higher than the phase transformation temperature. So, surface quality is mainly affected by the plastic bulge, flank squeezing and thermal effect caused by the milling force and temperature.

Key words: 300M steel, end milling, workpiece temperature, phase transformation, residual stress, microhardness

CLC Number:

YANG Sheng, DONG Qiong, PENG Fangyu, LIN Sen, YAN Rong. Workpiece temperature analysis and its impact on machined surface quality of ultra-high strength steel in end milling[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(5): 1722-1732.

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Workpiece temperature analysis and its impact on machined surface quality of ultra-high strength steel in end milling

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