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面扫描三维测量技术作为一种快速、便携、高精度的非接触式三维测量技术,在铸造领域得到了广泛的应用。本文研制了一套蓝光面扫描三维测量系统,该系统采用先进的蓝光技术,消除被测物体表面多反射特性的影响,提高了三维测量精度,单次测量精度达到0.02 mm,整体测量精度达到0.05 mm/m。并针对现有面扫描三维测量技术依靠标志点进行多视点云拼接的缺点,提出了一种基于几何特征的无标记点拼接算法,减少了人工干预,提高了测量效率。该扫描系统能够广泛应用于各类铸件的快速三维测量和精度检测 相似文献
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介绍了采用3D打印技术生产铸件的工艺原理,详细阐述了3D打印快速成型技术在缸体铸件生产中的应用。结果显示:随炉试棒的抗拉强度平均值为268 MPa,缸体顶面和缸筒壁硬度平均值分别为201 HB和191 HB,符合技术要求;铸件全尺寸和关键部位的位置度实际测量值都在要求范围内,说明打印的砂芯在浇注过程中变形较小,砂芯的打印精度较高;铸件进行机加工、装机后进行了台架冷试试验,结果良好。最后得出结论:采用3D打印制作全组芯砂型浇注铸件的工艺可以实现快速生产复杂铸件,铸件尺寸合格率高,试验周期大幅缩短,可有效支持产品先期研发工作。 相似文献
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3D打印技术因具备可成型任意形状零件的特点,已被广泛应用于许多领域,路径规划是3D打印制造过程中的关键技术之一。不同的扫描方式对成型精度、成型件的力学性能和成型效率有很大的影响,分别从针对这3个方面的路径规划进行了分析与讨论。最后指出了3D打印路径规划的研究重点。 相似文献
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采用先进的三维光学扫描技术,借助计算机软件对SLS打印的缸盖上水夹层砂芯进行三维数字化全尺寸扫描,检测分析了SLS打印砂芯尺寸精度及尺寸变化规律。检测结果显示:上水夹层砂芯不满足打印设备精度要求,需要改进打印工艺。根据三维光学扫描检测分析结果明确了3D打印工艺调整方向,改进了工艺打印的缸盖上水夹层砂芯,经过三维光学扫描检测,砂芯尺寸精度得到了有效地提高。通过对三维光学扫描技术在3D打印中的应用研究,对SLS打印砂芯精度检测提供了一种更为准确直观的测量方法,三维光学扫描检测结果作为SLS打印工艺参数调整依据,为SLS打印出合格的砂芯奠定基础。 相似文献
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神龙公司轿车车身点焊夹具的几何精度测量工作均采用便携式三坐标(3D)测量技术.便携式3D测量机(关节臂测量机)精度略低于固定式悬臂(或龙门臂)3D测量机,但对环境的低要求、便携性和相对高精度(0.07 mm/2.4 m)使其十分适用于车身零部件及其焊接夹具的几何精度测量工作.便携式3D能够现场测量零件和夹具,避免将测量物体运至专用3D测量间,极大地提高了车身制造、维护环节的工作效率,在汽车制造领域所有供应商、主机厂获得一致认可和广泛应用.从测量设备、测量软件、测量技术等方面介绍了该技术的应用,为该技术在汽车车身制造应用中出现的问题提出解决方案并展望其发展方向. 相似文献
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面扫描三维测量技术具有非接触、测量速度快、精度高等优势,在锻压领域具有巨大的应用潜力.但是通用的面扫描三维测量设备在测量过程中易受测量规划、数据处理等人为因素影响,测量精度难以保证.为解决此问题,提出一种基于面扫描和六自由度机器手的自动化三维测量技术,该技术由六自由度机器手、三维测量头、控制系统等组成,能够充分利用机器手运动灵活、工作范围大的特点和面扫描测量速度快、精度高的优势.此外,该技术采用了一种基于矩阵直积的手眼标定算法,实现了多次测量数据的高精度自动拼合.实际应用表明,该技术能够实现复杂锻件等工业产品的快速、精确、自动三维测量和精度检测. 相似文献
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介绍了3D打印技术的现状与发展,重点介绍了3D打印技术在未来铸造生产中的发展和应用。3D打印技术是新的工业革命的标志性技术之一,3D打印砂芯技术用于铸造,可实现无模铸造,有效提高复杂铸件的生产效益和效率,将给铸造业带来一场新的技术革命。 相似文献
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The role and impact of 3D printing technologies in casting 总被引:1,自引:0,他引:1
3D printing is such a magical technology that it extends into almost every sector relating to manufacturing, not to mention casting production. In this paper, the past, present and future of 3D printing in the foundry sector are profoundly reviewed. 3D printing has the potential to supplement or partially replace the casting method. Today, some castings can be directly printed by metal powders, for example, titanium alloys, nickel alloys and steel parts. Meanwhile, 3D printing has found an unique position in other casting aspects as well, such as printing the wax pattern, ceramic shell, sand core, sand mould, etc. Most importantly, 3D printing is not just a manufacturing method, it will also revolutionize the design of products, assemblies and parts, such as castings,patterns, cores, moulds and shells in casting production. The solid structure of castings and moulds will be redesigned in future into truss or spatially open and skeleton structures. This kind of revolution is just sprouting, but it will bring unimaginable impact on manufacturing including casting production. Nobody doubts the potential of 3D printing technologies in manufacturing, but they do have limitations and drawbacks. 相似文献
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Microstructure of Zn-Al4 alloy microcastings by micro precision casting based on metal mold 总被引:1,自引:0,他引:1
Metal mold micron scale precision casting technology was developed successfully, and three-dimension complicated microgear castings in micron scale were produced. Evolvement regularity of microgear castings were observed by optical microscope and scanning electron microscope. Compared with conventional casting, microcasting is characterized by typical nonequilibrium solidification, for example, its grain size can be refined significantly, eutectic structure is transformed from lamellar morphology to rod eutectic, and the ratio of primary phase is increased. This kind of microstructure can promote mechanical properties of microcasting. 相似文献
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Computer simulation codes were developed based on a proposed mathematical model for centrifugal mold filling processes and previous computer software for 3D mold filling and solidification of castings (CASM-3D for Windows). Sample simulations were implemented for mold filling processes of precision titanium castings under gravity and different centrifugal casting techniques. The computation results show that the alloy melt has a much stronger mold filling ability for thin section castings under a centrifugal force field than that only under the gravity. A "return back" mold filling manner is showed to be a reasonable technique for centrifugal casting processes, especially for thin section precision castings. 相似文献
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开发了一套对铸钢件进行冒口设计的软件,此软件利用AutoCAD—AME软件建造的铸钢件三维几何图形,对铸钢件各个部分的模数、重量、体积和表面积进行计算,并以模数法进行铸钢件冒口CDA。此软件的开发对进行基于三维的铸造工艺CAD/CAE的研究起到了积极的作用。 相似文献
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