汽轮机转子叶片骑缝攻丝工艺研究

发布时间：2018-02-28 12:47

本文关键词： 汽轮机骑缝攻丝力矩模型有限元参数优化　出处：《上海交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：汽轮机通过叶片将蒸汽的热能和动能传输到转子,从而获得旋转机械能,因此叶片与转子的可靠连接是汽轮机安全、稳定运行的关键。汽轮机叶片与转子的连接通过骑缝螺栓实现可靠装配。工艺上需要将叶片和转子进行骑缝钻削和攻丝,由于转子部分螺孔为深度65mm盲孔,为保证骑缝螺纹质量需要使用单把丝锥,一次完成骑缝攻丝。本文面对该骑缝攻丝工艺难题进行探索。首先进行了标准丝锥的骑缝攻丝试验,通过分析丝锥磨损状态,确定了丝锥材料和型号。基于理论分析结合骑缝攻丝工艺特点,建立了骑缝攻丝过程的力矩模型。基于ABAQUS有限元软件,建立了骑缝攻丝的简化模型,大大降低了攻丝有限元分析的计算量。基于该有限元模型,以骑缝攻丝中丝锥的几何参数和加工参数为优化条件,提出了以降低联合扭转力和偏心力为优化目标来提高骑缝攻丝工艺系统的可靠性和稳定性的方法。在上述工作的基础上,使用最优参数组合进行丝锥的静态应力分析和动态分析,验证了非标丝锥的可靠性。最终选取了前角6°、螺旋角35°、转速25r/min的骑缝攻丝丝锥的几何参数和加工参数。并使用定制后丝锥进行骑缝攻丝试验,获得较好的效果,为实际攻丝加工工艺提供了有价值的理论和试验依据。
[Abstract]:The steam turbine transmits the heat and kinetic energy of the steam to the rotor through the blade, thus obtaining the rotating mechanical energy, so the reliable connection between the blade and the rotor is safe for the turbine. The key to steady operation. The connection between turbine blade and rotor can be reliably assembled by riding seam bolt. The blade and rotor need to be drilled and tapped by riding seam in the process, because the rotor part of the screw hole is a blind hole with depth of 65mm. In order to ensure the quality of riding seam thread, a single tap is needed to complete the riding seam tapping at one time. In this paper, the difficult problems of the riding seam tapping technology are explored. First, the standard tap tapping test is carried out, and the wear status of the tap is analyzed. The material and type of tap are determined. Based on theoretical analysis, the torque model of riding seam tapping process is established based on theoretical analysis. Based on ABAQUS finite element software, a simplified model of riding seam tapping is established. Based on the finite element model, the geometric parameters and machining parameters of tap in slit tapping are taken as the optimization conditions. This paper presents a method to improve the reliability and stability of the riding seam tapping process system with the aim of reducing the combined torsion force and eccentric force. The static stress analysis and dynamic analysis of the tap are carried out by using the optimal parameter combination. The reliability of the non-standard tap is verified. Finally, the geometric parameters and machining parameters of the tapping tap with front angle of 6 掳, helical angle of 35 掳and rotational speed of 25 r / min are selected. It provides valuable theoretical and experimental basis for actual tapping process.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK266

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