超精密车削中心热分析边界条件的确定

Confirm of Thermal Analysis Boundary Conditions on High-precise Turning Center

高速高精度车削中心在加工过程中其结构会发热,从而产生热变形,影响工件与刀具间的相对位置,造成加工误差。分析车削中心整机的温度分布特点,对于如何控制机床温升、减小热变形、提高加工精度意义重大。有限元热分析是应用广泛的一种温度场虚拟分析方法,其中边界条件对分析结果起着决定性的作用。对车削中心整机有限元分析中的热边界条件进行了详细的分析计算,并建立了有限元热分析模型,进行了温度场分析,初步预测了车削中心整机温度分布。

In the machining process of high-speed and high-precise turning center, many heaters cause temperature rise and thermal deformation of the structure. The relative position of work piece and tool nose is affected, and mis-machining tolerance is produced. It is important to control the temperature rise, reduce the thermal deformation and increase the machining precise based on the analysis of the thermal distribution character of the whole turning center. Finite-element analysis is a widely used method of virtual thermal analysis, in which thermal boundary condition plays a decisive part to the analysis results. The analysis and calculation of thermal boundary condition of the whole turning center were carried out in detail. A finite-element thermal analysis model was established. The temperature field was analyzed and the thermal distribution of the whole turning center was forecasted in primary.