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重型燃机透平旋转叶片叶顶加工是叶片成型的关键工序，该工序加工精度决定了叶片顶部与其他部件装配间隙，该间隙大小可能会影响燃机运行做功效率，所以叶顶距转子中心回转半径关键尺寸需要准确控制。然而，不同规格功率的燃气轮机旋转叶片回转半径各不相同，需设计一种能适合不同回转半径叶片叶顶加工的自动化设备。针对耐高温镍基合金材料叶片加工特性硬化、热导性能差、切削力大等特点和传统CNC及电火花加工效率低、刀具损坏快、加工成本较高等问题，采用磨加工工艺与数字化控制相结合的方法开发一种磨削全自动化加工设备。该设备可以自动精确模拟不同规格燃机叶片回转中心实现不同回转半径的变化，同时可以模拟叶片绕转子中心旋转摆动动作；通过数字化实现叶片摆动大小角度的控制、可自动变换角度的磨削进给机构实现不同角度形状叶顶的磨削加工。试验结果表明，该设备功能达到设计要求且加工精度足够满足叶片叶顶加工公差，可用于批量生产。
Abstract：The processing of the blade tip of heavy-duty gas turbine rotating blades is a key procedure in blade shaping. The accuracy of this process determines the gap between the blade tip and other components, which may affect the working efficiency of the gas turbine. Therefore, the critical dimension of the blade tip distance from the rotor center rotation radius needs to be precisely controlled. However, the rotation radii of rotating blades vary across different specifications and power ratings of gas turbines, necessitating the design of automated equipment capable of accommodating blade tips with varying rotation radii. Given the hardening characteristics, poor thermal conductivity, and high cutting force associated with machining high-temperature nickel-based alloy blades, and considering the low efficiency, rapid tool wear, and high cost of traditional CNC and EDM processing, a grinding process combined with digital control has been developed to create a fully automated grinding device. This equipment can automatically and accurately simulate the rotation center of gas turbine blades of different specifications, achieving changes in rotation radius, and can also simulate the swinging motion of the blade around the rotor center. Through digital control, the angle of blade swing and the grinding feed mechanism for different angles can be controlled to achieve grinding of blade tips with different angular shapes. Experimental verification has shown that the functionality of this device meets design requirements and the processing precision sufficiently meets the tolerances for blade tip processing, allowing it to be used in mass production.
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基本信息:
DOI：10.12194/j.ntu.20230711001
中图分类号:TK473;TG580.21
引用信息:
[1]成李峰,谢凡,洪亮亮,等.燃气轮机动叶叶顶加工专用卧式磨削设备结构设计[J].南通大学学报(自然科学版),2024,23(01):73-79.DOI:10.12194/j.ntu.20230711001.
2023-09-14
2023-09-14
2023-09-14