共查询到20条相似文献,搜索用时 0 毫秒
1.
为发展创成式的计算机辅助工艺设计,研究了计算机辅助工艺设计系统中工件装夹规划的自动生成算法.基于扩展有向图,建立了零件的公差信息和基准-加工特征关系的数学表示模型,基于公差分析和制造资源能力模型,建立了从单件层到多件层的工件装夹工艺生产算法.该数学模型和算法可自动识别工件的加工特征、装夹基准,并根据制造资源能力和公差分析对装夹进行优化分组,实现装夹分组对工件加工精度的影响最小化,进而生成装夹规程.最后以实例证明了该方法的可行性. 相似文献
2.
Knowledge based process planning system for turned components 总被引:1,自引:0,他引:1
A. T. Joseph B. J. Davies 《The International Journal of Advanced Manufacturing Technology》1990,5(1):52-65
Recently, there has been a proliferation of CAD and NC systems for aiding the design and manufacture of components. However,
CAD and CAM have not been fully integrated due to the difficulty in automating the intermediate function, process planning.
At UMIST research is being carried out towards the integration of CAD and CAM by automating process planning. This paper describes
the development of a process planning system for turned components using expert system techniques (EXCAP). This system has
been integrated with the CAD system via IGES and with the NC machine using a cutting technology package developed at UMIST.
Thus it is currently possible to generate NC programs automatically for relatively simple turned components by feeding in
the CAD product data. 相似文献
3.
4.
针对目前制造行业资源或能力过剩与不足并存的问题,为方便企业对制造资源的整合和对可用资源进行合理有效的计划与管理,对云制造、云子链的概念及结构模型、云子链的评价与构造过程、云子链产能计算方法进行了研究,提出了从子链角度对云制造服务平台上的制造资源或服务能力进行计划的方法;并从子链多向协作角度,对子链之间的计划协商、进度反馈、冲突化解的机制进行了研究,提出了各层次子链落实与协调云制造资源计划的方法。研究结果表明,云子链的应用能够实现更精确合理地核算和计划制造资源,各层次子链之间的协调机制为后续计划的实施提供了理论方向性指导,对云子链整体制造资源进行计划和协调具有可行性和先进性。 相似文献
5.
分析了CAPP系统中工艺数据的特点以及CAPP系统对数据管理的总体要求,研究了C1ient/Sever(C/S)处理模式在工艺数据库中的应用,构建了基于C/S体系的动态网络数据库系统,详细介绍了系统各模块的功能及系统的安全保障措施。 相似文献
6.
Integrated assembly and machining planning for electronic products using a genetic algorithm approach 总被引:1,自引:1,他引:0
Yuan-Jye Tseng Chi-Hung Lin Yu-Hua Lin 《The International Journal of Advanced Manufacturing Technology》2008,36(1-2):140-155
To produce an electronic product, both assembly operations and machining operations are required in the process plan. In most
cases, the assembly operations and machining operations need to be combined in a continued order with an integrated sequence.
This is different from the traditional process planning approaches in which machining operations and assembly operations are
separated as two independent tasks with no interactions. For an electronic product, the two types of operations and the associated
costs may affect each other in an interactive way. Therefore, the sequence planning of assembly operations and machining operations
must be analyzed with an integrated model. In this research, a graph-based model is presented to represent the assembly and
machining operations in an integrated model. The related operation cost functions are developed to evaluate the costs for
the integrated assembly and machining sequences. The integrated sequence planning problem is solved using a genetic algorithm
approach with an objective of lowest operation costs. As a result, the assembly operations and machining operations can be
planned in an integrated sequence suitable for producing electronic products. The result shows that the developed method using
the genetic algorithm approach is efficient for solving the integrated sequence planning problem. Example products are demonstrated
and discussed. 相似文献
7.
S. Saravana Sankar S. G. Ponnanbalam C. Rajendran 《The International Journal of Advanced Manufacturing Technology》2003,22(3-4):229-236
Though the designers of Flexible Manufacturing Systems (FMS) strive to ensure the maximum flexibility in the system, in practice, after the implementation of such systems the operational executives often find it hard to accommodate frequent variations in the part designs of incoming jobs. This difficulty can very well be overcome by scheduling the variety of incoming parts into the system efficiently. In this work an appropriate scheduling mechanism is designed to generate a nearer-to-optimum schedule using Genetic Algorithm (GA) with two different GA Coding Schemes. Two contradictory objectives of the system were achieved simultaneously by the scheduling mechanism. The results are compared with those obtained by different scheduling rules and conclusions are presented. 相似文献
8.
Concurrent process tolerance design based on minimum product manufacturing cost and quality loss 总被引:3,自引:1,他引:3
M.F. Huang Y.R. Zhong Z.G. Xu 《The International Journal of Advanced Manufacturing Technology》2005,25(7-8):714-722
In a concurrent design environment, a robust optimum method is presented to directly determine the process tolerances from multiple correlated critical tolerances in an assembly. With given distributions of multiple critical assembly dimensions, the Taguchi quadric quality loss function is first derived. The quality loss is then expressed as the function of pertinent process tolerances. A nonlinear optimal model is established to minimize the summation of manufacturing costs and product quality loss. An example illustrates the proposed model and the solution method . 相似文献
9.
大型零部件的复杂工艺并行设计方法的研究 总被引:1,自引:1,他引:0
针对大型机械零部件的工艺要求,提出了一种基于任务驱动、面向大型零部件制造的复杂工艺并行设计方法.在分析了大型零部件制造工艺特点的基础上,采用面向对象和特征技术的哲理,按照其所涉及的工艺类型和工序复杂程度进行分类和任务划分,建立工序特征库.在实际应用时,先依据具体零件的工艺特点和所包含的工艺种类,利用工艺特征库构造面向任务管理的工艺特征模型,并以此进行任务划分和分派.就复杂的工艺方案而言,可按照工艺特征,将其分解成一系列单独的子任务.在工艺设计过程中,通过对这些子任务的管理和监控实现并行工艺设计.采用这种新的工艺设计模式,使这些含有不同类型工序(如机加工、焊接、冲压、清洗和数控等)的复杂工艺设计任务实现了统一管理,提高了工艺设计灵活性和效率. 相似文献
10.
11.
12.
13.
船体装配计算机辅助工艺计划系统 总被引:1,自引:0,他引:1
介绍了某造船厂船体装配计算机辅助工艺计划系统。包括:BOM表和焊接信息的获取,工艺计划(包括工时定额、材料定额)的制订,工艺项目表制订,基于成本的工艺计划优化,工艺计划系统与管理软件的信息集成。系统采用PowerBuilder 6.0和SQL Server6.5编制。 相似文献
14.
15.
由于激烈的市场竞争环境,灵活的制造商应该以最快的速度向市场推出产品,以最少的成本进行生产,从而拥有使消费者满意的巨大能力.而具有快速时间响应和高度柔性的制造系统是必要的.在假设的条件下,构建基于零件加工时间和成本加权和为目标的柔性制造系统机床选择数学模型,在模型中考虑机床的维修成本.用C语言实现遗传算法在柔性制造系统机床选择中的应用,并与以前的例子进行比较.最后通过实验对遗传算法的参数进行分析. 相似文献
16.
17.
制造环境中AGV运输子系统的路径规划 总被引:1,自引:0,他引:1
阐述了制造环境中AGV运输子系统的路径规划方法,运用Dijkstra算法和A*算法都能求得最优解,但从计算量及速度来说,A*算法优于Dijkstra算法。 相似文献
18.
QFD based optimal process quality planning 总被引:5,自引:0,他引:5
Lian Yu Zheng Kwai Sang Chin 《The International Journal of Advanced Manufacturing Technology》2005,26(7-8):831-841
Process quality planning is an important activity of quality assurance. It aims to determine manufacturing processes with
appropriate process capability to produce product characteristics. Quality function deployment (QFD) is a powerful tool for
quality planning, which starts with identifying customer needs and ends with determining process plans. However, most studies
on quality planning by QFD are limited to the product planning stage. The approach to process quality planning through QFD
has rarely been discussed. This paper adopts the optimal QFD model and further develops it for process quality planning. By
incorporating an empirical capability function for process elements, a composite process capability index (CCp) is presented to reflect the overall process quality level. Constraints including technical feasibility, correlations among
process elements, project budget and development time are considered. A case study of the numerical control (NC) machining
process quality for a thin-walled complex window frame of airship is given to illustrate how the proposed model can be effectively
applied by process quality team to determine the optimal target level of process elements concerning with resources utilization
. 相似文献
19.
20.
介绍基于SEFJ -PDM的工艺数据管理系统 ,在实现方便录入工艺数据的基础上 ,对工艺数据进行管理 ,生成各种生产用及管理用的工艺数据 ,并在SEFJ -PDM平台上与相关系统集成。 相似文献