共查询到17条相似文献,搜索用时 46 毫秒
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A model reconstruction and CNC tool path generation of broken blades was proposed for the conditions that damage regions locatesd on the leading/trailing edges and on the tips. Measured data points were sorted, adjusted, and then utilized to construct sectional spline curves. The section curve was smoothed based on the theory of minimized energy, a method of aligning the sectional curves according to the curvatures was proposed. A model reconstruction method based on the lofting strategy was presented for the edge broken blades and the tip broken blades. The damaged regions were extracted, based on which the algorithm for generating zigzag tool path and the spiral tool path was given for CNC machining. Preliminary simulation results reveal that the proposed method guarantees the smoothness of the reconstructed surfaces and the approximation to the blade's real size. The feasibility of the proposed tool path generation method was testifiecl. 相似文献
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为了航空发动机转子叶片的加工和仿真,首先要进行叶片的造型.叶片作为典型的自由曲面特征,其曲面的造型是先根据图纸设计出叶型的各截面曲线,然后将各个截平面的拟合线在径向进行叠加. 相似文献
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提出了一种新型的圆柱曲面凸轮结构,对圆柱曲面凸轮的轮廓曲线进行理论分析和计算,发现其轮廓曲线过渡不平滑。为了解决其不足,对其轮廓曲线进行优化设计,采用Catmull-Rom三次插值曲线拟合离散点的方法重新计算。将其计算结果在三维软件SolidWorks中模拟仿真,从而实现圆柱曲面凸轮轮廓曲线过渡连续、平滑。为了减小优化后的设计与实际加工的误差,利用SolidWorks软件与UG NX10.0软件的无缝连接,将其在UG NX10.0软件中生成的加工代码导入加工中心(CNC)的系统中进行编程加工,通过改变加工中心的主轴转速来提高新型圆柱曲面凸轮的加工精度。 相似文献
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针对飞机复杂结构零件工艺优化目标多变、优化要素难以确定的问题,引入价值工程理论,提出了基于工艺元活动的工艺优化价值评价方法。面向企业动态变化的优化需求, 提出了价值期望权重分配算法,从工艺元活动功能评价、成本评价、价值评价维度,建立了飞机结构件工艺优化的价值评价模型,针对不同工艺层级进行了优化价值分析。最后,通过一个优化实例验证了该方法的有效性。 相似文献
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以水轮机叶片维修加工为例,引入针对曲面拟合的拟合优度综合指数G,对逆向工程扫描数据的平滑处理结果进行评价,采用需要再加工工件的模型与理想工件模型在同一参考系中进行布尔运算,产生切削加工量的方法编制数控加工工艺,从而使大型复杂工件现场再制造技术中对于未知零件表面测量数据的平滑处理、造型和数控加工工艺问题,得到较好解决。 相似文献
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Blades are crucial parts of aero-engines. Their manufacturing is difficult because of their thinness, complex profile and stringent requirements. Electrochemical machining (ECM) is an important approach for manufacturing blades, but it is difficult to machine the leading and trailing edges. This article adopts cross-structural cathodes in ECM to solve the open electric field space problem. The key difficulty in the design of cross-structural cathodes is the position of the crossed-point. The height and the offset of the crossed-point are optimized using the ANSYS software. The simulation results show that the position of the crossed-point obviously affects the machining accuracy, along the leading and trailing edges of the blade. A pair of cross-structural cathodes with one uniform section is designed, and a series of corresponding ECM experiments are carried out. The experiments demonstrate that the ECM process is stable, the profiles are sleek and the machining dimensional error is reduced to 0.08 mm at the leading and trailing edges of the blade when using the new cathode structure. 相似文献
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Morphing wing has attracted many research attention and effort in aircraft technology development because of its advantage in lift to draft ratio and flight performance.Morphing wing technology combine... 相似文献
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《计算机集成制造系统》2017,23(第7期)
为改善叶片前后缘的表面质量、提高航空发动机的性能和寿命,对叶片前后缘百页轮抛光工艺进行研究。通过分析前后缘抛光存在的问题,结合砂带百页轮的抛光加工特点,提出前后缘百页轮柔性抛光工艺方法;基于Preston方程对抛光材料去除率进行分析,获得了影响抛光表面粗糙度的主要工艺参数(百页轮粒度、法向力、主轴转速和进给速度);采用响应面法设计抛光加工实验,分析了主要工艺参数及其交互作用对表面粗糙度的影响,建立了主要工艺参数与表面粗糙度的二阶预测模型,并得到最优工艺参数域和最优抛光工艺参数组合。前后缘百页轮抛光实验检测结果表明:前后缘表面质量明显改善,满足表面粗糙度小于Ra 0.4 μm的质量要求。 相似文献
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钝尾缘风力机翼型目前被多数用于大型风力机叶片叶根与最大弦长处,这是因为气动上,钝尾缘翼型能够提高升力系数斜率、降低翼型不敏感性;而结构上,钝尾缘翼型与相同厚度翼型相比增加了截面面积和转动惯量[1],论文依据钝尾缘特点,提出设计钝尾缘翼型方案,并以58米长度叶片为例,设计钝尾缘翼型形状,以及此区域主模型的分模方式,完成三维模型建立,为后续有限元建模及模具加工制造提供基础。 相似文献
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分析了叶根数控加工中出现欠切的原因,提出了解决办法。实践表明,该方法是一种叶根齿加工的编程小技巧。 相似文献
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