共查询到20条相似文献,搜索用时 25 毫秒
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针对整体叶轮加工过程中半精/精加工工艺,提出一种基于再生型颤振控制的整体叶轮非均匀余量加工工艺优化策略。借助有限元分析软件获取工艺系统的近似铣削力系数和固有频率,基于再生型颤振分析理论建立了均匀余量叶片和非均匀余量铣削加工稳定性极限叶瓣对比图。最后通过对均匀余量和非均匀余量两种叶片进行切削试验验证,证明了该非均匀余量工艺优化设计策略对抑制颤振有明显的效果,对整体叶轮实际加工和生产有一定的指导意义。 相似文献
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数控展成电解磨削整体叶轮叶片型面的研究 总被引:2,自引:0,他引:2
为解决整体叶轮叶片型面的精加工难题 ,进行了五轴联动数控展成电解磨削的基础研究。根据数控展成电解磨削整体叶轮叶片型面这一加工方法的特点 ,在分析了数控展成电解磨床的结构与运动的基础上 ,介绍了经济型多轴数控系统及其联动控制方法 ,建立了电解磨削非平行直纹展成曲面的数学模型 ,开发了五轴联动数控展成电解磨削自动数控编程系统 ,对航空发动机整体叶轮的叶片型面进行了电解磨削的工艺试验。结果表明 ,数控展成电解磨削工艺的加工精度和表面粗糙度可满足整体叶轮的技术要求。 相似文献
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Julien Chaves-Jacob Gérard Poulachon Emmanuel Duc 《The International Journal of Advanced Manufacturing Technology》2012,58(5-8):573-583
This paper deals with the machining of impeller blades by defining a numerical method to optimize the finishing strategy. This method is based on the evaluation of new multi-physical functional indicators, which express the geometric and economical performances of a toolpath. Geometric indicators are defined to ensure functional requirements: aerodynamic, mechanical, and machining-related. Using these indicators, the viable impeller blade finishing strategies are compared, considering their geometric performances and production cost. The production cost is represented by machining time, which is accurately computed to limit blade and tool deflections, in order to reduce and control the geometric errors caused by these deflections. Machining time is directly linked to the feed rate, which is coupled to radial cutting forces. Thus, the finishing strategy is optimized by considering simultaneously a complete set of impeller machining problems: geometric errors and deflections. The method presented to optimize the blade finishing strategy is then applied to an industrial impeller used in a pump. 相似文献
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When a 3-axis CNC machining centre is used for producing an impeller, great difficulties, i.e. collisions between the cutting tool and the impeller, can occur. The blade of an impeller is usually designed with a ruled surface. As the surface is normally twisted in design to achieve the required performance, it can cause overcut and collision problems during machining. The hub of the impeller is usually designed with an irregular surface, and is machined within a narrow and deep groove. The issues – how to satisfy the quality requirements of the part, reduce the machining time, and avoid the occurrence of collision – become an integral problem. This work develops an integrated 5-axis machining module for a centrifugal impeller by combining related machining technologies. As a result, cutter location (CL) data based on the geometric model of blade and hub are generated. Finally, the CL data are confirmed through software simulation. The results of verification show that the machining methodology and procedure adopted are successful. 相似文献
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液力偶合器叶轮三维整体有限元强度分析方法 总被引:10,自引:0,他引:10
宋光辉 《传动技术(上海)》2004,18(2):15-17
用有限元法,对某调速液力偶合器叶轮建立了三维实体模型,利用该实体模型,在有限元分析系统中对叶轮强度进行了分析计算,验证了叶轮强度的可靠性,为液力偶合器的设计、计算和结构优化提供了可靠的数据和方法. 相似文献
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讨论了整体叶轮这一典型复杂零件的CAD/CAM技术问题.通过对整体叶轮加工工艺的分析,利用UG软件实现了叶轮的建模与五轴编程,解决了叶轮CAD/CAM过程中的诸多关键技术问题,在MIKRON UCP710高速加工中心上成功地加工出了合格的整体叶轮. 相似文献
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带冠整体叶轮加工现状及新方法探索 总被引:3,自引:0,他引:3
综述了带冠整体叶轮的特点及国内外研制工作的现状,针对现有工艺方法的不足,提出了一种新的加工方法,即电解加工与电火花加工的组合电加工方法,进而对该工艺方法进行了介绍,分析了其技术特点。通过试验,其可行性得到了验证,有望成为带冠整体叶轮叶片型面的一种有效加工方法。 相似文献
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Five-axis rough machining for impellers 总被引:1,自引:0,他引:1
Ruolong Qi Weijun Liu Hongyou Bian Lun Li 《Frontiers of Mechanical Engineering in China》2009,4(1):71-76
The most important components used in aerospace, ships, and automobiles are designed with free form surfaces. An impeller
is one of the most important components that is difficult to machine because of its twisted blades. Rough machining is recognized
as the most crucial procedure influencing machining efficiency and is critical for the finishing process. An integrated rough
machining course with detailed algorithms is presented in this paper. An algorithm for determining the minimum distance between
two surfaces is applied to estimate the tool size. The space between two blades that will be cleared from the roughcast is
divided to generate CC points. The tool axis vector is confirmed based on flank milling using a simple method that could eliminate
global interference between the tool and the blades. The result proves that the machining methodology presented in this paper
is useful and successful. 相似文献
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针对整体叶盘数控铣削过程中存在的难题,从最优化的角度出发,结合近年来国内外文献研究,从铣削工艺方案优化和工艺参数优化两方面进行介绍,重点对刀具可达性、加工效率、颤振变形、刀具磨损以及优化模型、优化算法等相关优化技术的研究现状进行综述。通过分析现有研究中存在的一些难题,探讨了整体叶盘数控铣削优化技术的研究方法,对后期开展整体叶盘制造技术研究具有一定的参考意义。 相似文献
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整体叶轮五轴侧铣数控加工方法的研究 总被引:7,自引:0,他引:7
为提高整体叶轮的五轴编程和加工的能力,生成合理的刀位文件,在制定出合理的加工工艺的基础上,提出了一种适合于直纹面叶片五轴侧铣加工的刀轴矢量计算方法.对两个相邻叶片的直母线进行插值后,得到的刀轴矢量能完全避免刀具与叶片之间的干涉问题.同时,提出了一种小四边形参数模型来解决直线与自由曲面求交问题,并成功应用于刀心计算中.实例计算表明,所提出的方法能很好地应用于整体叶轮的五轴加工. 相似文献
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为了研究涂层参数失谐对整体叶盘振动特性的影响,创建含涂层的两自由度扇区集中参数模型,引入四种常见的主动失谐形式,详细分析了涂层质量、刚度、阻尼等参数失谐对系统振动特性的影响规律。创建含涂层参数失谐的整体叶盘集中参数模型,并由涂层引入常用的谐波、交替、线性及伪谐波四种形式的主动失谐。建立失谐后整体叶盘结构的运动方程,确定求解其固有频率及振动响应的方法,并给出了评价失谐程度的量化参数。通过实例分析了由涂层引入主动失谐后叶盘结构的振动特性。研究表明,叶盘系统发生由涂层引起的主动失谐后,系统最大响应随失谐量的增大呈现先上升后下降的趋势,有“阈值”现象。 相似文献
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钛合金整体叶盘是航空发动机的重要零部件,结构复杂,加工难度大。插铣加工因其轴向承受能力强和刚性大等特性,非常适合加工钛合金整体叶盘这类难加工、结构复杂的零部件。针对钛合金插铣加工效率的问题,采用响应曲面法设计插铣实验,建立切削力经验模型,以切削力和材料去除率为目标,采用NSGA-II算法进行多目标优化获得Pareto最优解。研究表明:切削力随主轴转速的增加而缓慢减小,随切削宽度、切削步距和每齿进给量的上升而增加;与实验初始参数组合相比,优化后的材料去除率提高了81.19%,而切削力减小了23.68%,达到了本研究的高效加工目标。 相似文献