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为解决整体叶轮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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介绍了数控展成电解磨床的结构与运动、组合式四轴联动数控系统以及直纹展成电解磨削整体叶轮叶片型面的数学模型。对整体叶片的叶片型面进行了平行直纹展成电解磨削。 相似文献
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整体叶轮数控展成电解加工运动轨迹及速度研究 总被引:1,自引:0,他引:1
在整体叶轮扭曲叶片型面加工方法中,数控展成电解加工展示了其优势。本文针对某型号航空发动机整体叶轮的加工,首先阐述了利用直纹面拟合扭曲型面的方法,然后通过对四轴数控展成电解加工过程的分析,采用不共原点的坐标变换对加工中的工件运动进行了研究,获得了各轴运动轨迹及工件上任意点的速度,分析了速度对展成电解加工间隙的影响,提出了编制数控加工程序的方法。最后,用试验对利用此法编制的数控加工程序进行了验证,试验结果表明该法能加工出符合要求的叶片型面。 相似文献
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精密展成电解加工整体叶轮的数控编程 总被引:4,自引:0,他引:4
以直纹面叶型整体叶轮为例 ,介绍了采用四轴联动方式精密展成电解加工整体叶轮叶片型面时 ,叶片型面的拟合方法、展成运动轨迹的生成算法以及各轴加工速度的确定方法 ,并结合实际加工工艺 ,对算法误差进行了初步分析。在此基础之上 ,利用 VC++6 .0开发了相应的数控编程软件 相似文献
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材料为高温合金的整体涡轮盘,其大扭曲叶片加工一直是制造业中的难题。提出多轴联动复合平面摆动展成电解方法加工大扭曲叶片,用一次进给电解实现叶盆、叶背面加工;分析复合平面摆动展成电解加工叶片型面成形规律,优化复合摆动展成电解加工数控编程及阴极结构设计,解决叶背出气边电解过切、根部三角区过切、出口短路等关键工艺问题;进行摆动式展成进给电解试验与分析,一次电解可达叶盆、叶背型面精加工要求。 相似文献
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葛媛媛 《中国制造业信息化》1999,28(5)
针对当前航空航天产品中的整体叶轮加工困难这一现状,提出了采用数控展成电解加工的方法来加工整体叶轮的扭曲叶片型面。为了确保加工中被加工叶片的形状符合设计图纸要求,对数控展成电解的试验进行了研究,得出了一种简单、可行的实验计算方法。首先计算出阴极的运动轨迹,再设计专门程序仿真阴极加工运动轨迹,从而预测叶片加工型面,对展成叶片型面进行校验。 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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Li-Chang Chuang Hong-Tsu Young 《The International Journal of Advanced Manufacturing Technology》2007,34(11-12):1062-1071
In mechanical engineering, most products or components, especially those for aerospace applications, are designed to fit the requirements of free-form surface features. The impeller often required by 5-axis machine operations is a key component of the aerospace industry. When 3-axis CNC machining center is used to manufacture the impeller, great difficulties, i.e., collisions between the cutting tool and impeller, need to be overcome. Presently most commercial CAM systems for 5-axis control lack generality, and functions for the rough tool-path generation are far from sufficient. Although the rough machining is the most important procedure influencing the machining efficiency and the condition for the following finishing process, many difficulties arise in performing 5-axis rough machining. The main objective of the present study is to overcome this problem by integrating the state-of-art machining technology, and consequently effective rough tool-paths are to be generated. This study aims to implement the algorithm of the constant scallop height method to improve tool-path planning of rough machining. As a result CL data based on the geometry model of blade and hub are generated. The CL data are confirmed by comparing them with original CAD model through software simulations and later by machining experiments. The verification results show that the machining methodology and procedure adopted turn out to be a successful case. 相似文献
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整体叶轮叶片型面的精密展成电解加工 总被引:2,自引:1,他引:2
介绍采用四轴联动方式精密展成电解加工整体叶轮叶片型面的实现方法,并针对某航空发动机上的一整体叶轮进行了叶片型面的精加工试验,取得了良好的试验结果。 相似文献
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三元整体叶轮叶片形状复杂,制造需采用CAD/CAM技术,以三维造型与编程软件编程,应用五坐标数控机床加工实现。对国内常用的典型三维CAD/CAM软件的建模特点和CAM性能进行了分析与比较。按照叶轮造型与加工对支撑软件的技术要求,指出适合于叶轮造型的CAD系统软件应以Pro/E和UG两种软件为主。在CAM方面,通用型CAM系统,可选用PowerMILL软件。如果条件允许,可选择专用叶轮加工软件NRECMAX-PAC或带叶轮模块的HyperMILL软件。几种软件混合使用,充分利用不同软件各自的优势,在实际应用中会取得很好的效果。 相似文献
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The integral impeller and blisk of an aero-engine are high performance parts with complex structure and made of difficult-to-cut materials. The blade surfaces of the integral impeller and blisk are functional surfaces for power transmission, and their surface integrity has significant effects on the aerodynamic efficiency and service life of an aero-engine. Thus, it is indispensable to finish and strengthen the blades before use. This paper presents a comprehensive literature review of studies on finishing and strengthening technologies for the impeller and blisk of aero-engines. The review includes independent and integrated finishing and strengthening technologies and discusses advanced rotational abrasive flow machining with back-pressure used for finishing the integral impeller and blisk. A brief assessment of future research problems and directions is also presented. 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