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针对空心涡轮叶片蜡型压制过程中陶芯定位元件补偿量难以量化问题,提出了基于蜡型壁厚测量结果的逆向解析算法。通过建立陶芯定位误差传递模型和逆向调整模型,确定了陶芯壁厚偏差与定位元件补偿量之间的映射关系。运用超声脉冲反射法对一组蜡型进行壁厚测量,根据测量结果逆向调整陶芯定位元件尺寸并重新压制蜡型进行对比分析。结果表明,该方法能够有效计算陶芯定位元件尺寸补偿量,对提高空心涡轮叶片蜡型定型效率以及进一步控制空心涡轮叶片壁厚精度有一定指导意义。
In order to solve the problem that it is difficult to quantify the amount of compensation for the positioning element of the ceramic core in the process of wax-type pressing of the hollow turbine blade, an inverse analysis algorithm based on the measurement results of the wax-type wall thickness is proposed. Through the establishment of the error model of the positioning of the ceramic core and the reverse adjustment model, the mapping relationship between the deviation of the wall thickness of the ceramic core and the compensation amount of the positioning element is determined. Ultrasonic pulse reflection method was used to measure the wall thickness of a group of wax patterns. Based on the measurement results, the dimension of the ceramic core positioning elements was reversely adjusted and the wax patterns were re-pressed for comparative analysis. The results show that this method can effectively calculate the dimensional compensation of the positioning elements of the ceramic core. This method is of guiding significance for improving the waxing efficiency of hollow turbine blades and controlling the wall thickness of hollow turbine blades.