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介绍了熔融挤压成形原理,提出了复杂外形产品成形方向选择原则与工艺操作流程,通过实例设置了工艺参数,成功加工出复杂外形产品。 相似文献
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以某款平板产品上的塑料按键为例,经前期分析,原设计方案注塑加工过程中易造成残余应力过大的问题。通过设计两种结构方案,分别进行Moldflow和ANSYS Workbench仿真分析,确立方案二为最优设计方案。通过L16(44)正交试验,对工艺参数进行优化。优化后方案二的最大残余应力为26.75 MPa。经仿真分析,方案二的按键力在设计要求范围内。通过优化分析,能够避免产品因残余应力过大,出现变形、开裂、强度不足等情况,对同类型产品在注塑成型分析及应用具有一定的借鉴意义。 相似文献
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根据ANSYS对熔覆层应力场的仿真结果,指导激光熔覆锤击系统锤击力和锤击频率的选择,采用AT89C52单片机为控制核心,DAC0832模数转换器和步进电机86BYG450A作为执行装置,设计其电源、锤击力、锤击频率和步进电机控制电路,对Fe313的熔覆层进行锤击试验验证。试验表明,系统稳定性良好,锤击频率符合精度要求,锤击使熔覆层的力学性能得到了改善。 相似文献
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并行栅格扫描填充路径及其规划算法 总被引:2,自引:0,他引:2
深入分析快速成形制件翘曲变形的原因后,提出一种全新的扫描填充路径--并行栅格路径及其规划算法.按照这种路径能够近似、并行地完成整个待成形二维平面区域的扫描填充过程,在减小XY向温度梯度的同时,均匀化不同位置材料成形后的冷却收缩约束力,使得不同位置材料的冷却收缩趋于同步和均匀,减小了制件的整体翘曲变形量.实验表明,该算法能够在与其他类型路径的规划算法大致相当的时间和空间复杂度下,获得扫描填充性能更加优越的路径. 相似文献
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光固化成形是一种基于逐层累加方式发展起来的新的制作工艺,零件的加工效率是成形中需要考虑的关键问题之一.激光扫描路径和扫描速度影响每层加工时间.扫描速度一定时,扫描路径的优化与否将直接影响加工时间.本文对平行扫描路径进行分析,针对激光器扫描时加减速额外消耗时间,运用图形学中多边形性质及激光扫描过程特点,提出了优化扫描方向的算法,可在不降低精度的基础上大幅度提高效率.文章给出了这种扫描路径的轨迹生成方案,并提出提取狭长分枝的分区算法. 相似文献
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For the data processing of the Rapid Prototyping Manufacturing, Boolean operation can offer a versatile tool for editing or modifying the STL model, adding the artificial construction, and creating the complex assistant support structure to meet the special technical requests. The topological structure of STL models was built firstly in order to obtain the neighborhood relationship among the triangular facets. The intersection test between every edge of one solid and every facet of another solid was taken to get the intersection points. According to the matching relationship of the triangle index recorded in the data structure of the intersection points, the intersection segments array and the intersection loop were traced out. Each intersected triangle was subdivided by the Constrained Delaunay Triangulations. The intersected surfaces were divided into several surface patches along the intersection loops. The inclusion prediction between the surface patch and the other solid was taken by testing whether the candidate point was inside or outside the solid region of the slice. Detecting the loops for determination of the valid intersection lines greatly increases the efficiency and the reliability of the process. 相似文献