共查询到20条相似文献,搜索用时 93 毫秒
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针对大型汽车冲压模具复杂棱脊和沟槽的数字化问题提出了三维自适应测量算法。为适应于激光表面强化加工的特殊要求,在后续测量数据处理过程中建立了复杂棱脊和沟槽的简化数学模型,提出了六维激光加工轨迹规划算法,并进行了测量和加工试验验证。上述算法都已应用到集成化柔性激光加工系统中。 相似文献
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分析了复杂曲面CAD重构设计中的基本流程,重点介绍了重构设计中涉及的几个关键技术。首先,介绍一种基于Bezier曲线曲面造型原理的复杂曲面重构方法。该方法用三角网格对将离散点云进行拓扑划分,将一个复杂的零件曲面划分为多个小曲面;然后采用轨迹线生成技术重构复杂曲面中的特征线,采用网格优化技术提高重构效率;最后,采用曲面光顺技术,使重构后的曲面达到应用需求。 相似文献
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基于参数曲面映射的五轴数控螺旋加工轨迹计算方法 总被引:2,自引:0,他引:2
采用五轴数控机床进行高速加工时,加工干涉及曲面转角处的突变会造成刀轴矢量剧烈变化,而采用传统的退刀再进刀的方法又难免导致加工效率及质量的降低.针对上述问题,提出一种新颖的适用于五轴高速加工的刀具路径生成算法.该方法由偏微分方程的热传导模型,计算得到映射参数域内满足加工参数的温度等值线,制定映射规则并在标准参数域内规划出加工轨迹,从而在对应参数域内映射生成螺旋轨迹,并将该轨迹映射到参数曲面上获得曲面的螺旋加工轨迹,该轨迹可以实现无退刀加工.采用上述算法进行了仿真,仿真结果表明该方法优于现有加工方法,可实现基于参数曲面及裁剪曲面的复杂型腔的高速加工. 相似文献
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CAD/CAM ALGORITHM OF RULED SURFACE BASED ON LINE GEOMETRY 总被引:1,自引:0,他引:1
CAD/CAMALGORITHMOFRULEDSURFACEBASEDONLINEGEOMETRY①HuZhanqiCuiYunqiQiaoLeiLiYupengMechanicalEngineeringInstitute,YanshanUniver... 相似文献
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反求工程中复杂曲面重构算法研究与实现 总被引:9,自引:2,他引:7
针对复杂曲面的精密制造与检测,提出了一种有效实用的曲面重构算法。系统地论述了该方法重构复杂曲面的实现全过程。实例表明,该方法具有采样效率高、重构曲面精度高、曲面光顺等特点。 相似文献
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曲面的可视方向信息计算 总被引:1,自引:0,他引:1
为了支持并行设计与制造,研究曲面可视方向信息的咨询方法。提出从曲面的几何数据中提取和分析可视方向信息,建立计算曲面可视方向的算法,并给出计算结果。借助于该方法,能够在设计阶段有效地获取一制造相关的方向信息,实现对设计的可制造性分析。 相似文献
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Simultaneous optimal selection of design and manufacturing tolerances with different stack-up conditions using scatter search 总被引:3,自引:3,他引:0
Alluru Gopala Krishna K. Mallikarjuna Rao 《The International Journal of Advanced Manufacturing Technology》2006,30(3-4):328-333
The allocation of design and manufacturing tolerances directly influences the manufacturing cost and functionality of a product. Traditionally, it is carried out in two phases; CAD and CAPP, in a sequential manner. This approach has the drawbacks of more lead-time and sub-optimality. The present work reports on a procedure to simultaneously allocate both design and manufacturing tolerances based on minimum total manufacturing cost. The optimization model for tolerance design is a non-linear multivariable problem. Since such a problem may have a noisy surface, there is a need to apply an efficient global optimization technique. In the present work, scatter search, one of the recently emerged optimization techniques in the area of metaheuristics, is applied successfully to determine the optimal tolerances at the minimum manufacturing cost. An example is taken from the literature to explain the proposed methodology. The results exhibit the effectiveness of the proposed algorithm over other methods. 相似文献
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In the ultra-precision manufacturing of large optics, industrial robots have the potential to become an intelligent and economical choice of surface polishing. However, the transport of the workpieces between the polishing platform and the measurement instrument seriously limits the manufacturing efficiency. Therefore, an in-situ measurement system based on the monoscopic deflectometry is developed to determine the form quality of the optical lenses during rough polishing. Stray light reflected from the lower surface of transparent lenses may degrade the measuring quality, thus an effective absolute phase retrieval algorithm is developed to decouple the superposed fringes associated with the upper and lower surfaces. Then, the form of the upper surface under polishing can be reconstructed to guide the subsequent polishing. Experimental results demonstrate that the accuracy of the method is comparable to that of the coordinate measuring machine, consequently the manufacturing efficiency and reliability of large optical workpieces can be greatly improved. 相似文献
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基于遗传算法的超精密切削表面粗糙度预测模型参数辨识及切削用量优化 总被引:2,自引:0,他引:2
建立易于分析各切削用量对粗糙度影响关系的表面粗糙度预测模型和最优的切削用量组合,是超精密切削加工技术的不断发展的需要。针对最小二乘法和传统优化方法的不足,提出了将遗传算法用于超精密切削表面粗糙度预测模型的参数辨识,并用于求解最优切削用量,给出了金刚石刀具超精密切削铝合金的表面粗糙度预测数学模型和切削用量优化结果,进行了遗传算法和常规优化算法的比较,结果表明遗传算法较最小二乘法和传统的优化方法更适合于粗糙度预测模型的参数辨识及保证切削用量的最优。 相似文献
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Dr A. Seiler V. Balendran K. Sivayoganathan A. Sackfield 《The International Journal of Advanced Manufacturing Technology》1996,11(4):276-284
The design and manufacture of sculptured surfaces using the reverse engineering (RE) approach is popular in industry. RE requires the definition of surfaces, a process that is usually performed using a coordinate measuring machine (CMM). However, the present methods for surface model reproduction require a high density of data points, resulting in increased manufacturing times.This paper proposes a method to reduce the manufacturing times. In this method constrained least-square fitting techniques are employed. The splines are then blended to a surface model by a spline segment matching and subdividing algorithm. A model refinement method is proposed, that uses only a fraction of the data points. Experimental results and future developments are also included. 相似文献
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随着多自由度增材制造技术的发展,直接基于曲面的分层处理和路径规划方法被广泛研究。针对目前曲面分层算法通用性不强、效率低下等问题,提出基于多信息体素空间划分的高效鲁棒的自由曲面分层算法。通过将三角面片表面体素化,快速筛选出相交三角面片,算法时间复杂度由传统算法的平方复杂度降低为线性复杂度,解决了以往曲面分层算法难以处理大尺寸复杂模型的问题。根据三角网格邻接边的拓扑连续性避免同一轮廓环交点在不同求交条件下的重复计算,解决交点重复求交过程因为浮点数计算误差导致的点扩散问题,获取正确曲面轮廓交线环。最后对交线环内部的曲面进行三角剖分,获取曲面内部信息,得到曲面分层结果。测试了不同模型的圆柱面、球面、自由曲面等类型的曲面分层处理以及算法运行时间,验证了本算法的高效性和正确性。在6轴KUKA机器人和2轴变位机组合装备上对螺旋桨模型进行加工试验,证明了本算法的实用性。 相似文献
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网络化制造资源集成共享与优化配置主要包括协同制造总任务的分解、单任务驱动的制造资源的评价选择、时序约束关联单任务链驱动制造资源链的构建三个阶段。首先根据协同制造总任务分解的特点,提出了跨组织协同制造任务分解过程模型和相应的分解算法。然后提出了单任务约束驱动网络化制造资源评价指标体系与评价算法,在此基础上对单任务驱动检索的候选资源集,提出了基于改进蚁群算法的时序约束关联单任务链驱动网络化制造资源服务链构建模型与算法。最后通过仿真算例说明了研究成果的有效性。 相似文献