An investigative study of the interface heat transfer coefficient for finite element modelling of high-speed machining
An investigative study of the interface heat transfer coefficient for finite element modelling of high-speed machining
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DOI：
10.1243/09544054jem1179
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发表时间：
2008-11
期刊：
影响因子：
--
通讯作者：
S. Iqbal;P. Mativenga;M. Sheikh
中科院分区：
文献类型：
--
作者：
S. Iqbal;P. Mativenga;M. Sheikh
本文涉及的实验装置和有限元（FE）模拟的金属干滑动的界面传热系数估计的发展。在金属加工过程中，切屑、刀具和环境之间的热传递会影响温度和磨损机制，进而影响刀具寿命和加工部件的精度。对于金属加工过程的建模，界面热传递系数是量化切屑和刀具之间的热传递以及准确预测切削刀具内的温度分布的重要输入参数。在先前涉及金属加工过程的有限元分析的研究中，传热系数被假定为在10 kW/m2 °C和100 000 kW/m2 °C之间，其背景来自金属成形过程（特别是锻造）。基于操作特性，金属成形和金属加工过程在本质上是不同的。因此，有必要开发一种接近金属加工过程的程序，以估计该参数，以提高有限元模型的可靠性。为此，开发了一种实验装置，其中未涂覆的硬质合金销在钢工件上摩擦，而后者以与切削试验相似的速度旋转。这种改进的销盘装置配备有温度和力监测设备。建立了热产生和摩擦接触的有限元模型。干滑动过程的实验和模拟结果产生摩擦速度范围内的界面传热系数。
This paper is concerned with the development of an experimental set-up and finite element (FE) modelling of dry sliding of metals to estimate the interface heat transfer coefficient. Heat transfer between the chip, the tool, and the environment during the metal-machining process has an impact on the temperatures and on the wear mechanisms, and hence on the tool life and on the accuracy of the machined component. For modelling of the metal-machining process, the interface heat transfer coefficient is an important input parameter to quantify the transfer of heat between the chip and the tool and to predict the temperature distribution accurately within the cutting tool. In previous studies involving FE analysis of the metal-machining process, the heat transfer coefficient has been assumed to be between 10 kW/m2 °C and 100 000 kW/m2 °C, with a background from metal-forming processes (especially forging). Based on the operating characteristics, metal-forming and metal-machining processes are different in nature. Hence there was a need to develop a procedure close to the metal-machining process, to estimate this parameter in order to increase the reliability of FE models. To this end, an experimental set-up was developed in which an uncoated cemented carbide pin was rubbed against a steel workpiece while the later was rotated at speeds similar to the cutting tests. This modified pin-on-disc set-up was equipped with temperature and force-monitoring equipment. An FE model was constructed for heat generation and frictional contact. The experimental and modelling results of the dry sliding process yield the interface heat transfer coefficient for a range of rubbing speeds.