接触弹性变形下叶片边缘机器人磨抛温度预测

Temperature prediction of robotic belt grinding of blade edges under contact elastic deformation

针对现有温度计算模型中仅考虑接触轮外部弹性橡胶的弹性模量,从而导致预测温度偏低问题,提出一种接触轮-叶片接触弹性变形影响下的叶片边缘机器人砂带磨抛温度预测方法.首先,根据弹性模量公式计算外力作用下的接触轮铝合金芯和外部弹性橡胶的组合弹性模量;然后,基于赫兹弹性接触理论计算考虑接触轮组合弹性模量时的接触面积及材料去除深度;最后,确定磨抛过程中的热量分配比以得到传递进入叶片边缘的热流密度.利用ANSYS软件模拟不同加工参数下考虑接触轮组合弹性模量及仅考虑弹性橡胶弹性模量时叶片前后缘的温度分布,并与实验测量值进行对比分析,结果表明:考虑接触轮组合弹性模量模型的模拟温度与实验测量值的平均相对误差为13.9%,验证了所提方法的合理性.该方法能够为后续叶片边缘局部烧蚀控制提供优化策略.

Aiming at the problem of low prediction temperature caused by only considering the elastic modulus of elastic rubber outside the contact wheel in the existing temperature calculation model,a method for predicting the robotic belt grinding temperature at the blade edges under the influence of contact wheel-blade contact elastic deformation was proposed.Firstly,the combined elastic modulus of the aluminum alloy core and external elastic rubber was calculated according to the elastic modulus formula.Secondly,both the contact area and material removal depth when considering the combined elastic modulus of the contact wheel were calculated based on the Hertzian elastic contact theory.Thirdly,the energy partition during the grinding process was determined to obtain the heat flux transferred into the blade edges.The ANSYS software was used to simulate the temperature distribution at the blade edges when considering the combined elastic modulus of the contact wheel and only considering the elastic modulus of the elastic rubber under different parameters,and the results were compared with the experimental values.The results show that the average relative error between the simulated temperature and experimental values considering the combined elastic modulus of the contact wheel is 13.9%,which verifies the rationality of the proposed method.This method also can provide an optimized strategy for the local burn control of blade edges in the future work.