共查询到18条相似文献,搜索用时 604 毫秒
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微小机械快速成型系统中的 CAD 技术 总被引:2,自引:0,他引:2
介绍了微小机械快速成型系统中的CAD技术,详细讨论了微小机械快速成型系统切片软件的设计,为开发微小机械快速成型系统奠定了基础。 相似文献
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AutoCAD环境下直接适应性切片方法及实现 总被引:1,自引:0,他引:1
数据分层处理是快速成型技术的核心.适应性分层可以有效解决快速成型中成形精度和速度之间的矛盾.利用AutoCAD二次开发技术,通过比较相邻层片截面的面积确定切片厚度,提出了一种基于CAD模型的直接适应性切片方法,并对该方法进行了实现,同时与定层厚切片方法进行了比较,最后给出了分层实例并对结果进行了分析. 相似文献
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快速成型(Rapid Prototyping,RP)技术是一种基于离散/堆积成型原理的新型制造方法,是在计算机的控制与管理下,根据零件的CAD模型,采用材料精确堆积的方法制造零件原型的技术。在RP中,由于成型机的数据接口问题,通常在切片之前需要将CAD模型转换成STL模型,而在模型转换过程中不可避免地会产生精度损失。数据处理误差是所有RP系统都不可避免的共性问题,对于数据处理误差的研究具有普遍的意义。在分析误差产生原因的基础上,提出了一种模型转换误差评价方案,改善了快速成型制件的精度。 相似文献
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适应性分层是解决快速成型的成型精度和成型速度这一对矛盾体的最好方法之一.文中利用了UG二次开发技术,通过比较切片的轮廓数目和面积来综合判断层厚,提出了一种基于CAD模型的直接适应性切片方法.针对算法中的关键问题,进行了深入探讨.最后给出了分层实例,并对结果进行了分析. 相似文献
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激光固化快速成型制造中,支撑结构设计的优劣极大影响原型的制作精度。首先通过分析非水平下表面的分层制作过程,研究了其翘曲变形的机理。利用可仿真成型过程中层间力学行为的有限元计算模型,对层间悬臂量与翘曲变形量的关系进行了有限元计算仿真与试验验证。针对激光成型过程中零件需要支撑的非水平下表面,从激光固化快速成型制造中支撑结构的作用出发,以成型精度为设计目标,通过有限元计算仿真、试验验证等手段研究提出了针对零件中非水平下表面的支撑结构形式、布局及支撑间距等支撑设计规则。通过试验验证,按该规则对零件的非水平下表面进行支撑结构设计,可有效地保证激光固化快速成型的制作质量。 相似文献
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基于喷墨打印机的三维打印快速成型系统开发及实验研究 总被引:1,自引:0,他引:1
三维打印成型技术是目前快速成型领域最具生命力的技术之一,有广阔的应用前景。通过研究三维打印成型机理,针对目前在三维打印成型中广泛使用热气泡式喷嘴所存在的问题,提出了采用压电式喷嘴喷射成型材料和粘结材料的思想。讨论了基于压电式喷墨打印机的三维打印快速成型系统开发的关键技术和方法,根据这一思路开发了一套快速成型系统,并研究了粉末配方、铺粉方式、打印层厚、切片方向、等工艺参数。实验结果验证,所开发的快速成型系统制造的精细模型圆孔直径可达0.5mm,壁厚可达0.8mm,成型误差在±0.2mm以内。 相似文献
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A New Slicing Procedure for Rapid Prototyping Systems 总被引:7,自引:2,他引:5
Y.-S. Liao Y.-Y. Chiu 《The International Journal of Advanced Manufacturing Technology》2001,18(8):579-585
The current slicing rule of most rapid prototyping (RP) systems cannot ensure unilateral tolerances on the whole prototype
and often results in problems of overcut and undercut on the same part. This drawback leads to unsatisfactory precision of
the part in post processing. In order to reduce the above problems, a new slicing method is proposed in this paper. Based
on the geometry information in a stereolithography (STL) file, an algorithm is developed. The appropriate slicing rule is
selected according to the inner product of the normal vector and working direction of the part, together with the function
of the part to be manufactured. The STL file is cut into 2D sections and an accurate contour is calculated. After the slicing
computation, an appropriate working path is produced. The rules proposed in this paper have been verified. This work contributes
to the improvement of slicing rules in existing RP systems, especially in systems using uniform thickness slicing. It also
improves manufacturing efficiency and working tolerances. 相似文献
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通过UniGraphics二次开发平台UG/OPEN GRIP实现切片和路径规划算法,完成UG模型的切片、路径规划的自动生成.对机器人代码生成系统进行了介绍,并将RP技术与熔焊技术相结合,利用UG二次开发对三维实体进行直接适应性切片,提高了切片的速度,克服了传统切片方法由于采用三角形面片逼近三维物体模型所引起的精度不高的问题.另外,针对不同的零件类型采取不同的路径规划方法,形成连续运动路径,从而不同程度地提高了成型效率和零件的成形质量. 相似文献
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Dexel-Based Direct Slicing of Multi-Material Assemblies 总被引:5,自引:3,他引:2
Slicing is an important procedure in rapid prototyping (RP) pre-processing, and can be grouped into two categories: direct
slicing and adaptive slicing. At present, investigations into the use of both direct and adaptive slicing methods are taking
place. However, not many direct slicing approaches have been reported in the literature. The methods are also restricted to
some solids in CSG or some CAD systems. Also, approaches on adaptive slicing are too complicated. The method proposed in this
paper employs dexel encoding for direct slicing multi-material (MM) assemblies in RP. One advantage of using a dexel model
is that Boolean operations can be performed simply on 1D line segments. Dexels can also be easily converted to tool paths
in RP machines. Compared to the ray representation of CSG trees, dexel models can be extended to represent MM assemblies with
material properties. Therefore, the method has high potential for direct slicing. In this paper, traditional dexel models
are first extended for rapid manufacturing single solid and MM assemblies. Compared to other adaptive slicing approaches,
a much more efficient and simple dexel model, for adaptive refinement in the building direction is then developed. To further
improve the surface finish, a layerwise refinement approach is also discussed. Finally, the computational complexity of the
proposed method is studied. 相似文献
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通过UniGraphics二次开发平台UG/OPENGRIP实现切片和路径规划算法,完成UG模型的切片、路径规划的自动生成。对机器人代码生成系统进行了介绍,并将RP技术与熔焊技术相结合,利用UG二次开发对三维实体进行直接适应性切片,提高了切片的速度,克服了传统切片方法由于采用三角形面片逼近三维物体模型所引起的精度不高的问题。另外,针对不同的零件类型采取不同的路径规划方法,形成连续运动路径,从而不同程度地提高了成型效率和零件的成形质量。 相似文献
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选择性激光烧结新型扫描方式的研究及实现 总被引:25,自引:3,他引:25
选择性激光烧结(Selective laser sintering,SLS)快速成形技术是近10年来发展起来的一种先进制造技术,采用此项技术可以显著地缩短产品投放市场的周期,降低成本,提高产品质量,增强企业的竞争能力。而扫描方式是SLS成形过程中的一项关键技术,在分析了现有扫描方式及其对SLS制件精度、强度以及成形速度影响的基础上,指出了现有扫描方式的缺陷。为了克服这种缺陷,特提出并实现了一种新的分区变向扫描方式及其分区算法,它通过将扫描线段进行分组,以避开截面内孔和凹槽。这种新的分区变向扫描方式及其算法已经成功地应用到华中科技大学开发的HRPS系列SLS系统中。实际应用表明:这种新型扫描方式能大幅度地提高烧结成形效率和减小烧结体的翘曲变形量。 相似文献
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Direct Slicing from PowerSHAPE Models for Rapid Prototyping 总被引:4,自引:2,他引:2
X. Chen C. Wang X. Ye Y. Xiao S. Huang 《The International Journal of Advanced Manufacturing Technology》2001,17(7):543-547
Rapid prototyping processes produce parts layer by layer directly from CAD models. An efficient method is required to slice
the geometric model of a part into layers. Several slicing methods are introduced in this paper: slicing from STL files; tolerate-errors
slicing; adaptive slicing; direct slicing; adaptive and direct slicing. PowerSHAPE is a powerful package for building models,
and it provided macro language and picture files for its secondary development work. To meet rapid proto-typing slicing demands,
the author proposes a direct slicing approach based on PowerSHAPE models. In this method, lines, arcs and Bezier curves are
used to describe the section contours. This approach can be used in stereolithography, selective laser sintering, fused deposition
modelling, and other rapid prototyping processes, e.g. laminated object manufacturing. It may be the future solution to existing
slicing problems. 相似文献