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针对飞行器大型薄壁件加工的技术难点,开发了基于机器人操作的智能柔性工艺装备系统。通过分析系统结构和运行原理,建立了数学模型,提出了多点定位的自适应优化方法。该方法根据给定的加工轨迹,自适应地调整柔性工装系统的定位/支承分布,保证总体加工变形趋近最小。实例验证表明,该方法可以使柔性工装系统的支承分布处于最优状态,实现对系统资源的最佳利用,满足飞行器大型薄壁件的高速高精度加工需求。 相似文献
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针对开发飞行器大型薄壁件柔性工艺装备系统的需求,对该类新型工装系统运行模式的优化生成问题进行了研究。通过分析系统结构和运行原理建立了系统模型,并根据自生成原理,提出了系统运行模式的优化自生成方法。该方法基于工件自身信息和加工过程自身信息,通过有限元分析与遗传算法相结合的自寻优途径,经过不断自身进化,实现定位/支承阵列的全局优化,克服了传统方法通过外部指令,由操作人员根据经验调整系统运行模式而存在的问题。实例验证表明,该方法可使柔性工装系统中定位/支承阵列布局的拓扑形态和分布密度处于最优状态,从而使系统资源得到最佳利用,为柔性工艺装备系统的高质高效运行奠定了基础。 相似文献
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针对开发飞行器柔性工艺装备的需要,对支撑阵列驱动方法进行了研究,提出了一种采用机器人协调操作技术来实现支撑阵列X、Y坐标定位的方案。针对双机器人同步运动控制,采用交叉耦合控制算法,对双机器人之间同步误差进行实时补偿。此外,鉴于双机器人工作区域存在重叠区,提出了一种通过调整速度分布来实现双机器人避碰的方法。实验表明,采用的交叉耦合控制算法和避碰算法在双机器人协调工作中取得了良好效果,保证了飞行器柔性工艺装备支撑阵列较高的定位精度。 相似文献
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《现代制造技术与装备》2018,(12)
在飞行器大型薄壁件制作工艺中,柔性工艺装备系统对整个系统运行与优化起着非常关键的作用。从飞行器大型薄壁件制造工艺现状出发,介绍国内外制造工程发展现状,并以此为基础深入研究飞行器大型薄壁件制造柔性工装技术应用策略,期望能够为行业有关人士提供可操作性较强的建议,促进整个行业快速发展和提高。 相似文献
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介绍一种三维空间中基于散乱数据点三角剖分的自由变形技术。运用Voronoi图和Delaunay三角剖分,将待变形曲面上的点(作用点)用控制顶点线性表示出来,移动控制顶点使作用点发生位移,从而使曲面的形状发生局部的改变。这种方法改进了诸如自由变形(FFD)、直接自由变形(DFFD)和扩展自由变形(EFFD)等传统曲面变形技术在局部变形上的应用。 相似文献
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Guilian Wang Yiqiang Wang Lei Zhang Ji Zhao Haibo Zhou 《Machining Science and Technology》2013,17(4):603-625
□ A novel self-determination polishing robot finishing large mold free-form surface is developed, and the finishing process method is researched. Contrary to traditional approaches, our premise is that a large mold surface can be polished by using a small robot. This robot system is mainly composed of a polishing robot part, a computer system and a visual positioning system. A type of robot with four uniform distribution wheels was designed, which has two driving wheels and two driven wheels. Active compliant control of the polishing tool was provided by a pneumatic servo system, and a new special compliant abrasive tool was proposed on the basis of robot characteristics. The process planning steps consisted of subdividing the free-form surface, choosing an abrasive tool, planning the polishing path and optimizing machining parameters. Based on the orthogonal experiment and the grey relational analysis method, the optimal parameter combination was obtained for polishing force, tool speed and feed rate. Aiming to polishing times, the surface roughness method and polishing efficiency method were studied in detail. The polishing experiments were carried out in the robot using process parameters obtained by the efficiency method. These research results provided significant theory foundation and experimental data for a mobile robot planning polishing to realize intelligible process parameter selection. 相似文献
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Goran Baer Johannes Schindler Christof Pruss Jens Siepmann Wolfgang Osten 《International Journal of Optomechatronics》2014,8(4):242-250
The Tilted-Wave-Interferometer (TWI) is a non-null, full-field interferometric measuring technique for aspheric and free-form surfaces with a new degree of flexibility. The interferometer uses a set of tilted wavefronts to locally compensate the deviation of the surface under test from its spherical form. Since it is a non-null technique, there is no need for costly compensation optics. The measurement data acquisition is highly parallelized, leading to a short measurement time in the region of few seconds, by simultaneously achieving a high lateral resolution. The unique combination of these characteristics makes the TWI a perfect candidate for the integration into the process chain of aspheric and free-form surface manufacturing. 相似文献
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对自由曲面的数控加工,寻求最优的刀具轨迹生成方法至关重要。本文基于开源3D库Open CASCADE(OCC)和编程开发环境Microsoft Visual Studio 2010(VS2010),应用B样条表达的自由曲面,采用“投影法”思想,研究“重用已有相似刀具路径”方法,提出了处理自由曲面的NC刀具轨迹映射算法。为了验证算法的有效性和可行性,实验建立5类自由曲面,启动设计的轨迹映射算法,输出曲面的NC加工轨迹质量可以满足设计要求,实现了刀具轨迹的重用。 相似文献
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High-performance machining of free-form surfaces is highly critical in automotive, aerospace, and die–mold manufacturing industries. Therefore, electrochemical machining (ECM) process has been used in such cases in that sense. The most important challenges of using ECM process are the lack of accuracy and difficulty in designing proper machining tool (cathode) surfaces. In this article, a simplified mathematical model is presented to obtain a cathode surface for ECM of free-form surfaces which have high curvatures. In this theoretical approach, the finite-element method (FEM) is used to solve the 3-D Laplace equation and to determine the potential distribution between the anode (workpiece) and cathode (tool) surfaces. A compact and simple program was developed to obtain a proper cathode surface that only requires some nodal coordinates on the anode surface and boundary conditions. In this work, a trial cathode surface is constructed for a given gap distance. For the determined ECM parameters, cathode shape that satisfies the boundary conditions is obtained for the 45th layer. The results are compared with the literature and ANSYS Workbench for verification. The developed theoretical approach benefits simpler and faster FEM solutions, accurate cathode surface, and consequently correct form of machined surface. 相似文献