共查询到20条相似文献,搜索用时 31 毫秒
1.
Manish Kumar Sunil Rajotia 《The International Journal of Advanced Manufacturing Technology》2006,28(1-2):109-116
Today’s manufacturing systems are striving for an integrated manufacturing environment. To achieve truly computer-integrated
manufacturing systems (CIMS), the integration of process planning and production scheduling is essential. This paper proposes
a framework for integration of process planning with production scheduling in a job shop environment for axisymmetric components.
Based on the design specifications of incoming parts, feasible process plans are generated taking into account the real time
shop floor status and availability of machine tools. The scheduling strategy prioritizes the machine tools based on cost considerations. 相似文献
2.
A Dynamic Programming Based Process Planning Selection Strategy Considering Utilisation of Machines 总被引:1,自引:0,他引:1
H.-C. Chang F.F. Chen 《The International Journal of Advanced Manufacturing Technology》2002,19(2):97-105
Computer-aided process planning (CAPP) has been recognised as a key element in computer-integrated manufacturing (CIM). Despite
the fact that tremendous efforts have been made to develop CAPP systems, the benefits of CAPP in real-life manufacturing environments
are not obvious. One of the main difficulties in applying CAPP in real manufacturing settings is the missing link between
generated process plans and shop-floor activities. The assumptions that the shop floor remains static and there are unlimited
resources available have caused a typical CAPP system to make a repetitive selection of the same most desirable machines for
manufacturing different parts. When process plans for various parts are finally sent to the shop floor, process bottlenecks
normally arise, making the generated plans ineffective.
Some efforts have been made in the integration of process planning and shop floor activities; however, the problems associated
with the lengthy time and impractical attempts at the generation of process plans, remain unsolved. Since in most cases, it
is possible that several alternatives exist for machining a part by using different equipment, a stage-type network structure
can be constructed. This paper introduces a dynamic programming based process plan selection strategy, enabling the efficient
solution of this stage-type network prob-lem. In this proposed strategy, the use of workstations is also taken into consideration
so that the resulting plan is valid for the conditions that exist on the shop floor at the time an order is released. A case
study has been provided to substantiate the effectiveness of this proposed strategy. 相似文献
3.
P. Y. Gan K. S. Lee Y. F. Zhang 《The International Journal of Advanced Manufacturing Technology》2001,18(9):624-632
This paper describes the use of artificial intelligence in the process planning of plastic injection mould bases. The computer-
aided process-planning system, developed for IMOLD? will extract and identify the operations required for machining. These
operations are considered together with their precedence constraints and the available machines before the process plan for
the mould base plate is generated. The process plan is optimised by a branch and bound based algorithm. Overall machining
time has been proposed as the objective function for optimisation. The ability of this algorithm to search intelli-gently
for a feasible optimised solution is illustrated by an industrial case study. A brief comparison with a genetic algor-ithm
based process planning system is also made. The result of this development will allow users to optimise process plans easily
for any given mould base, with options to suit dynamic changes on the manufacturing shop floor. 相似文献
4.
针对具有工序约束信息的柔性流水车间的设备利用率优化问题,提出利用PSODE混合算法来解决该问题,全局优化过程采用群体优化算法,在局部优化过程中通过上下道关联工序约束信息来控制工件的分配,将并行工位总设备利用率作为适应度函数,构建了具有关联工序约束的柔性流水车间生产调度模型,确定生产工件的加工路径、加工顺序、开工时间和完工时间。通过多组方案数值计算结果对比分析,验证了PSODE算法解决柔性流水车间设备利用率优化问题的有效性。 相似文献
5.
成批生产计划调度的集成建模与优化 总被引:8,自引:1,他引:8
针对多品种批量生产类型,建立了调度约束的生产计划与调度集成优化模型。模型的目标函数是使总调整费用、库存费用及生产费用之和最小,约束函数包括库存平衡约束和生产能力约束,同时考虑了调度约束,即工序顺序约束和工件在单机上的加工能力约束,保证了计划可行性。该模型为两层混合整数规划模型,对其求解综合运用了遗传算法和启发式规则,提出了混合启发式求解算法。最后,针对某机床厂多品种批量生产类型车间进行了实例应用,对车间零件月份作业计划进行分解,得到各工段单元零件周作业计划,确定了零件各周生产批量与投产顺序。 相似文献
6.
Liu Shiping Rao Yunqing Zhang Jie Li PeigenSchool of Mechanical Science Engineering Huazhong University of Science Technology Wuhan China 《机械工程学报(英文版)》2002,15(3):213-217
Adopting distributed control architecture is the important development direction for shop floor management and control system, is also the requirement of making it agile, intelligent and concurrent. Some key problems in achieving distributed control architecture are researched. An activity model of shop floor is presented as the requirement definition of the prototype system. The multi-agent based software architecture is constructed. How the core part in shop floor management and control system, production plan and scheduling is achieved. The cooperation of different agents is illustrated. Finally, the implementation of the prototype system is narrated. 相似文献
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8.
Tae Jo Ko Jung Whan Park Hee Sool Kim Sun Ho Kim 《The International Journal of Advanced Manufacturing Technology》2007,32(7-8):739-746
Once a machining process is finished, an inspection process is carried out to check whether the part is within dimensional
tolerances. A coordinate measuring machine (CMM) is a general metrological device for assessment of dimensions on the shop
floor. It cannot be ignored, however, that CMM measurements require significant resources in operating time and cost, which
has led to many studies into on-machine measurement (OMM) systems. This study aims to develop an OMM system with a noncontacting
laser displacement sensing apparatus and a computer-aided design (CAD) model for ease of operation, improved operating speed,
and free form profiling. The system is composed of two software modules, one for sensor alignment with the machine tool and
the other for measurement based on CAD/CAM (computer-aided machining). Consequently, the system was verified on the shop floor
at a numerical control (NC) machining center. 相似文献
9.
A Cascading Auction Protocol as a Framework for Integrating Process Planning and Heterarchical Shop Floor Control 总被引:1,自引:0,他引:1
Patrick McDonnell Glen Smith Sanjay Joshi Soundar R.T. Kumara 《International Journal of Flexible Manufacturing Systems》1999,11(1):37-62
A new contract net-style auction protocol is proposed as a framework for integrating process planning and shop floor control in heterarchical manufacturing systems. Process planning is partitioned into on-line and off-line activities; off-line process planning decisions are represented in a graph format and used as input for on-line process planning activities performed by machine controllers. Triggered by the opening round of an auction, the final on-line stages of process planning are dovetailed with the resource allocation process in the shop floor control system. The auction process allows final process planning decisions to be based on timely information, relying on the distribution of static process planning information rather than the distribution of a model of dynamic shop floor status and allowing a controller to identify all the primary and secondary resources and operations that must be provided for the incremental processing of a part. 相似文献
10.
H. Eivazy M. Rabbani M. Ebadian 《The International Journal of Advanced Manufacturing Technology》2009,45(9-10):968-986
Semiconductor manufacturing systems are one of the most complex production systems and this complexity increases when these systems produce both make-to-stock (MTS) and make-to-order (MTO) products in order to improve the production system utilization. To deal with this complexity, we present a dynamic production control and scheduling model for a semiconductor shop (fab) with hybrid MTS/MTO production environment. The proposed model encompasses two major modules: release module and dispatching module. The release module deals with two issues: prioritizing the MTS and MTO products in the job pool and determining when and which products can be released into the shop floor. The only considered issue of dispatching module is to prioritize the MTS and MTO products in the queue of each workstation whenever a machine becomes idle. To evaluate the proposed model, different performance measures for MTS and MTO products are considered. Moreover, a number of numerical experiments have been conducted by simulation studies. Simulation studies indicate that the proposed model outperforms other related well-known production control and scheduling policies in the literature. 相似文献
11.
Ajai Jain P. K. Jain I. P. Singh 《The International Journal of Advanced Manufacturing Technology》2006,30(11-12):1111-1118
Process planning and scheduling are the two important manufacturing functions involved in any shop floor activities. As functional integration is essential to realize the benefits of computer integrated manufacturing, a scheme for integration of process planning and scheduling has been introduced in this paper. The proposed scheme can be implemented in a company with existing process planning and scheduling departments when multiple process plans remain available on the shop floor. It consists of two main modules, introduced in detail in this paper. They are process plan selection module and scheduling module. 相似文献
12.
基于双单元制造模式的车间调度控制系统 总被引:1,自引:0,他引:1
基于敏捷制造思想研究了离散生产类型的先进制造车间的调度控制系统。在研究双单元制造模式运行和组织特点的基础上,给出了单元重组方法。研究了先进制造车间生产任务管理、生产计划、车间调度、生产运行控制、生产信息管理等问题,提出了以单元动态重组技术为基础的车间生产调度控制系统。 相似文献
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14.
一种改进的遗传算法在车间调度中的应用 总被引:6,自引:0,他引:6
研究现代生产先进制造车间调度问题 ,对于发挥先进制造车间的高效性和灵活性具有十分重要的意义。生产过程的计划调度问题 ,是实现制造系统运筹技术、管理技术与优化技术的核心。因此 ,优化调度算法的性能直接影响到FMS的生产效率和应变能力。本文在传统的遗传算法的基础上 ,对车间调度算法进行了深入的研究。基于机床负荷平衡的思想 ,提出了面向先进制造车间的平衡遗传算法 ,并与传统的遗传调度算法进行了对比。实验表明 ,该调度方法具有较高的可行性、有效性和稳定性。保证了各个机床的负荷平衡 ,满足了交付期的要求 相似文献
15.
Liu Fei Cao HuajunInstitute of Manufacturing Engineering Chongqing University Chongqing ChinaZhang HuaInstitute of Manufacturing Engineering Wuhan University of Scienceand Technology Wuhan ChinaYuan ChuanpingInstitute of Manufacturing Engineering Chongqing University Chongqing China 《机械工程学报(英文版)》2003,16(4):337-339
Noise reduction in a shop floor is one of the important parts of green manufacturing. In ashop floor, machine tools are the main noise sources in a shop floor.A new approach is discovered byinvestigation that the noise can be obviously reduced in a shop floor by optimizing the schedulingbetween work pieces and machine tools. Based on the discovery a new method of noise reduction isproposed. A noise reduction scheduling model in a shop floor is established, and the application of themodel is also discussed. A case is studied, which shows that the method and model are practical. 相似文献
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为了实现面向精益生产的制造系统中的工艺与调度并行设计,在工艺规划决策中,建立了面向精益生产的工艺规划与调度集成模型.在考虑设备负载平衡以及完成加工任务时间最短的条件下,设计了一种离散模拟退火粒子群优化(Particle Swarm Optimization based on Simulated Annealing,SAPSO)算法,并行设计及优化零件的工艺方案和调度方案,并最终获得其最优工艺方案及与之相对应的优化调度方案.通过对10台设备10种零件的示例仿真验证了算法的有效性. 相似文献
18.
Dr Ing A. G. Mamalis I. Malagardis K. Kambouris 《The International Journal of Advanced Manufacturing Technology》1996,12(5):330-338
An approach to the on-line integration of process planning and production scheduling is reported. Based on a geometric modeller, a geometric analyser and a knowledge base, the process planner generates alternative process plans and provides automatic tool selection and calculation of the appropriate machining parameters. Time and cost estimations are input to the decision-making module in the production scheduling system that produces optimal scheduling decisions as well as a complete record of the actual state of the factory resources. An information flow, designed as a relational data model, maintains the interaction between the process planning and the production scheduling systems and provides the dynamic feedback to the process planner. Specific geometry features of the blank, the finished part and the cutting tools, and geometry features-based rules are stored in the database of a developed CAPP system by using a separate CAD interface. The integrated production planning and production scheduling system and the CAPP system were validated with rotational parts machining. 相似文献
19.
Integrating Flexible Process Plans with Scheduling in Flexible Manufacturing Systems 总被引:17,自引:6,他引:11
C. Saygin S. E. Kilic 《The International Journal of Advanced Manufacturing Technology》1999,15(4):268-280
This paper highlights the importance of integration between process planning and scheduling in flexible manufacturing systems
(FMS). An effective integration increases the potential for enhanced system performance and enhanced decision making A framework
that integrates flexible process plans with off-line (predictive) scheduling in FMS is presented. The flexibility in process
planning, including process flexibility, sequence flexibility, and alternative machine tools, is discussed. The proposed framework
consists of four integrated stages with the objective of reducing the completion time. The integrated stages include:
1. Machine tool selection.
2. Process plan selection.
3. Scheduling.
4. Re-scheduling modules.
In addition, the paper proposes a new approach, namely the Dissimilarity Maximisation Method (DMM), for selecting the appropriate
process plans for a part mix where parts have alternative process plans. The recursive structure of the framework provides
a different approach, namely overlapping schedules, which considers a longer scheduling period as comprising several short
scheduling periods. Knowing that neither the process plans nor the planned (predicted) schedules are truly followed on the
shop floor, the related literature and the corresponding approaches are compared in order to envisage new approaches for closing
the gap between process planning and scheduling. 相似文献
20.