共查询到19条相似文献,搜索用时 171 毫秒
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基于Browser/Serve三层浏览器/服务器的网络数据库模式,规划和设计了面向航空结构件的热处理工艺资源库,包括热处理工艺规则资源库、热处理工艺决策资源库、热处理工艺参数数据库和热处理工艺装备图片库等。对航空结构件热处理生产过程中的质量检验与控制、工艺参数的制定以及工艺装备的选择等项目进行了信息化管理,不仅能缩短生产周期,还为热处理CAPP系统的开发和应用提供基础,对改善企业技术与管理水平、提高市场竞争力起十分重要的作用。 相似文献
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为实现工艺设计过程中对产品设计数据的有效重用,提出了一种切削体分解组合策略.该策略利用对切削体的分解组合,向工艺设计提供所需的基本工艺路线、工艺模型、尺寸公差等工艺数据.为生成符合工艺要求的切削特征,阐述了切削体分解算法和分割面的生成方法;研究了几何约束、工艺约束下的分割面分解优先级确定规则;探讨了单元切削体组合条件和优先组合策略.通过实例阐述了该策略下的工艺设计过程,验证了该策略的可行性和有效性. 相似文献
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《机电工程》2021,38(8)
针对齿轮轮系运动方案设计的研究还没有形成完善的理论体系的问题,运用单元组合方法与实例验证方式,对齿轮轮系运动方案进行了分析,创建了一种轮系运动方案分析模型。通过单元连接方程和单元组合特征状态方程,研究了其特征状态矩阵分解规则,得到了齿轮系统的矩阵串联、并联及混联分解算法,实现了特征状态矩阵的拆分,并形成了齿轮轮系运动方案分析流程;同时,齿轮轮系的单元库中存在着含传动比、输入转速等设计需求的基本单元,对其运动特征矩阵进行了拆分,通过匹配获取了单元,并进行了相应的组合。研究结果表明:特征矩阵的拆分方法是高效且可应用的,以风力发电的变桨齿轮箱齿轮轮系运动方案求解为例,从该例中获得了9种运动方案结果,说明该分析方法可为实际工程中齿轮轮系运动方案研究提供参考。 相似文献
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介绍以ISO14649中STEP-NC为基础的集产品设计、工艺设计、加工制造为一体的新CAD/CAPP/CAM/NC体系结构,研究联结产品设计和STEP-NC加工制造的工艺设计步骤,着重分析设计特征和制造特征的转换、制造特征分解、零件工艺信息模型及制造特征排序的机制。在Pro/E设计特征系统的支持下先进行CAD设计,然后通过Pro/TOOLK IT提取制造特征,建立零件工艺信息模型,再根据特征组工艺库、知识库和制造资源库对工艺方案进行整理,最后生成STEP-NC文件。 相似文献
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大型焊接结构件CAD系统的研制 总被引:2,自引:0,他引:2
在分析各种焊接结构件的基础上,确定了焊件最小单元的形状、尺寸和结构要素,建立了焊件最小单元的图形库。根据图形库生成的最小单元,结合焊接工艺数据库,在已建立的装配模块中进行装配造型,从而生成大型焊接结构件的三维造型图和二维工程图,形成大型焊接结构件的CAD系统。 相似文献
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铸造工艺装备 CAD 专家系统开发工具的研究 总被引:3,自引:0,他引:3
根据对铸造工艺装备设计全过程的知识表达特点的分析,建立了一个知识表达为规则+数据库+计算的产生式专家系统开发工具,并在铸造方法上得到了应用。 相似文献
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基于特征的制造工艺资源建模与检索方法研究 总被引:4,自引:0,他引:4
为表达制造工艺资源特征层次结构、分类结构及资源对象关系,采用面向对象与特征建模技术构建了制造工艺资源特征模型,用特征映射技术描述零件结构特征与加工特征、加工特征与加工方法特征、加工方法与制造工艺资源特征的映射关系和模糊决策方法。研究了用工序特征描述工艺设计过程所对应的资源特征的集,并以形式化表示,提出了从制造工艺资源数据库中检索工序资源特征,以特征参数的相似性计算来检索与工序匹配的资源特征的检索算法。最后,将该方法应用于工艺设计中制造工艺资源特征与工序特征的匹配。 相似文献
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面向STEP-NC的特征CAD/CAPP系统 总被引:2,自引:0,他引:2
将特征建模技术与STEP及STEP-NC标准相结合,为实现CAD/CAPP/CAM及CNC的集成,探索了一条有效的途径。建立基于STEP AP224的特征模型,它包含工艺设计所需要的产品管理、材料、精度等信息。另外,将特征与加工方法链相对应,并建立相应的数据库,同时讨论了工步排序的若干规则。在Pro/ENGINEER软件平台上,实现了CAD/CAPP/CAM高层次的集成。以三轴数控加工的棱柱体零件为例,阐述了工步的产生以及排序,最终生成符合STEP-NC标准的加工文件。 相似文献
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移动机器人基于拓扑地图导航时要求图像特征提取与匹配算法具有高的精度和鲁棒性、良好的实时性,针对此,提出了基于全局特征和局部特征的图像分级匹配算法。首先对输入的待匹配图像应用改进的形状上下文算法提取全局特征与图像库中图像进行遍历粗匹配,得到与当前待匹配图像相似度最高的3幅图像并构建临时图像库;然后利用改进的SIFT算法提取输入图像局部特征与临时图像库中3幅图像的局部特征进行精确匹配,最终得到与待匹配图像相似度最高的图像作为匹配结果输出。所提出的图像分级匹配算法将基于全局特征的改进形状上下文算法和基于局部特征的改进SIFT算法相结合,从而达到优势互补的目的。实验结果表明,该算法在机器人基于拓扑地图导航过程中有效地提高了图像匹配效率,缩短了运行时间。 相似文献
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并行环境下基于层次与特征技术的设备资源模型研究 总被引:7,自引:0,他引:7
将层次建模技术及特征建模技术有机地结合起来,对设备资源数据进行了分析与抽象,并应用面向对象技术,提出了设备资源特征的面向对象表达策略,建立了设备资源的层次模型和特征模型,为不同应用环境提供了不同层次的设备资源信息。 相似文献
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KBE-based stamping process paths generated for automobile panels 总被引:1,自引:2,他引:1
Jinqiao Zheng Yilin Wang Zhigang Li 《The International Journal of Advanced Manufacturing Technology》2007,31(7-8):663-672
As automobile body panels are one kind of sheet metal part with groups of free form surfaces, the process planning is more
complicated than common sheet metal stamping to implode effectively and practically. Based on KBE, new frameworks have been
presented as intelligent master model at the system level and as procedure model at the activity level. In accordance with
these frameworks, an intelligent CAPP system has been specifically developed. Based on feature technology, features have been
extracted and represented by the object-oriented method. Stamping features and their parameters have been defined and extracted
based on feature technology and stamping process rules. The whole product knowledge has been represented by frames which directly
map to objects (or features) in the object-oriented sense. Relevant appropriate operations features have been assigned to
stamping features of a product based on feature-operation criteria, parameters of the stamping feature and their correlativity.
This assignment is a decision-making activity using a set of rules with a decision-making tree and model-based reasoning methods.
With knowledge between operations, such as operations order constraint (do-after) and operations combination constraint, process
paths have been improved based on relevant intelligent reasoning methods. Based on the relationships (preferred-to) between
processes and machines/dies, the structure of die and machine for each process can be identified, since the process route
has been determined. In this stamping process planning, the procedure and information have been controlled by a process control
structure that is associative and integrated. 相似文献
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针对数控加工中零件信息的多样性,整合CAPP和NC中的共用资源,设计法兰盘类零件的检索式CAPP系统。检索式CAPP系统建立在成组技术基础上,利用零件的工艺相似性,通过检索和修改标准工艺(典型工艺)规程来制定相应的工艺规程[2]。在设计中涉及到成组技术、特征编码以及数据库设计与开发等关键技术。在实例开发中,以成组技术为理论指导,用Access创建零件工艺数据库,VB开发相应程序。该系统可直接检索已有的零件,可对任意法兰盘类零件进行特征编码,并判断其族类,对已有的族类检索出相似工艺,修改后保存,可为数控加工编程做准备。 相似文献
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将数控工艺的设计分成了两大模块,即加工特征级的智能工艺决策过程和加工方法级的派生式数控代码生成。对加工特征进行数控加工工步设计时,辅以加工特征数控工艺决策知识库、机床特征映射库和刀具特征映射库的智能支持,提高了工艺决策的准确性和智能化水平。同时以加工特征为单元,采用参数化编程技术实现数控程序的派生式生成,提高了数控程序设计效率和质量,并有利于数控程序设计的自动化、智能化、模块化。 相似文献
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A recognition process of the features in a part model resorts to the knowledge of an application engineer. The knowledge is
encoded as rules of the recognition procedure at the beginning that are applied to the part model during the recognition process.
Such a human interaction is difficult to control in extracting the intended features because the intended features by the
application engineer may change from one engineer to the other and the external situations. Instead, we treat the result of
the recognition process as a rough extraction and allow the user interactively modify the result. In this paper, we present
a feature recognition system where the user can inspect the result of the recognition and delete recognized features interactively. 相似文献
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A. Arivazhagan N. K. Mehta P. K. Jain 《The International Journal of Advanced Manufacturing Technology》2009,42(9-10):850-872
This paper presents a STEP AP203–214-based machinable volume identifier (MVI) to identify the finish-cut machinable volume in prismatic parts by deducting the rough-machined part from the final part. The MVI provides an intermediate link between rough and finish machining computer-aided process planning system for automatic generation of process plans while machining prismatic parts. To calculate the machinable volumes of manufacturing features, the MVI utilizes the output of the feature identifier which contains the information about the dimensional details, edge loops, edges, vertices, coordinate points, and location planes of the features. In this research, a total of 234 features have been considered; out of which, 32 are normal and 202 are tapered. To calculate the machinable volumes for these features, generalized methodologies are developed for 17 basic feature types, each having a varying number of specific features. Initially, the pattern strings are generated for the front and back face of the rough-machined feature and final feature. Then, MVI uses the predefined syntactic pattern strings stored in the strings database and checks with the generated strings of the feature to determine the shape of the machinable volume stored in the volumes database. After determining the shape, one relevant methodology or more (for features having combination of more than one taper) are selected from among the 17 “feature type” specific methodologies developed for finish-cut machinable volume identification. In this article, methodology is presented for one basic feature type which covers 14 features and explained through one case study. The final output from this module is stored as a text file with full dimensional details of machinable volumes for later use inside the machining planning module. The proposed MVI can be used in Computer Integrated Manufacturing Industries as an intermediate linker to achieve a robust manufacturing environment. 相似文献