Transient Thermal and Analytical Model of Whirling Process Based on Time-varying Heat Source in Machining Screw

doi:10.3901/JME.2018.15.180

Abstract

Abstract: Screw whirlwind milling is an efficient and eco-processing technology. In the process of screw whirlwind milling, a lot of heat and resultant temperature are generated, which further affects tool life, machining accuracy and surface integrity of workpiece. Little researches on temperature for screw whirlwind milling process are conducted. Againest the context, a time-varying heat source modeling method is proposed to analyze the transient temperature in the cutting zone for screw whirlwind milling, considering the time-varying characteristics of undeformed chip thickness, width and area. Firstly, the time-varying characteristics of undeformed cutting areas are analyzed. Further, the time-varying characteristics of the heat sources are modeled including undeformed chip geometry, time-varying tool-chip contact area and time-varying boundary model. On the basis of the above models, the time-varying heat liberation intensities of heat sources are modeled. Finally, the time-varying transient temperature model is developed to analyze the transient temperature. Experiments under different cutting conditions were performed on CNC whirling milling machine and the proposed methods for thermal analysis modeling proved to be effective and accurate to be used in the screw whirlwind milling process as well. The proposed model can be used to predict effects of undeformed chip geometry and cutting velocity on dynamic changes of the temperature in the cutting zone, which provides decision-making supports for process designers of whirlwind milling.

Key words: screw, temperature, time-varying heat source, whirlwind milling

CLC Number:

TG501

HE Yan, LIU Chao, LI Yufeng, WANG Lexiang, WANG Yulin. Transient Thermal and Analytical Model of Whirling Process Based on Time-varying Heat Source in Machining Screw[J]. Journal of Mechanical Engineering, 2018, 54(15): 180-190.

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