MRPII implementation: key factors for success

Successful implementation of MRPII depends on effective management control of manufacturing systems projects. In this paper we present the results of detailed research into the implementation process in different companies. Common problems are highlighted, and the difference between successful and unsuccessful implementations is examined. Our aim is to provide a guide to help managers avoid some of the pitfalls along the road to the MRPII goal.     

企业在运用MRPII系统过程应解决的几个主要问题

本文简单介绍了MRPII系统的来源、发展趋势、基本原理及在国内外地运作情况等,它在国外取得了巨大的成绩,在国内并不理想。与国内企业的管理方面有很大的关系。通过对企业在实施MRPII过程中存在的问题的分析,提出一些解决方案。     

A TQM approach for designing and building dedicated machines and equipment in-house

Many industries are responding to the need for major design changes in their manufacturing systems to include flexible and controllable systems that produce superior-quality products on time and at a lower cost. Maintaining flexibility while meeting the functional requirements of a manufacturing system often requires designing a machine that is unique. Consequently, a new trend in manufacturing systems design is to build such machines in-house. This paper describes a systematic implementation of total quality management (TQM) along with continuous improvement concepts to design and build a test-stand in-house. This project also involves creating a prototype for on-going machining design for future needs.     

企业在运用MRPⅡ系统过程应解决的几个主要问题

本文简单介绍了MRPⅡ系统的来源、发展趋势、基本原理及在国内外地运作情况等，它在国外取得了巨大的成绩，在国内并不理想。与国内企业的管理方面有很朋的关系。通过对企业在实施MRPⅡ过程中存在的问题的分析，提出一些解决方案。     

制造信息全面质量管理研究(一)

从信息角度看,制造企业中一切制造活动都可以视为由一系列不同层次的、不同程度相关联的制造决策/执行/检测和再决策单元Dij组成,制造信息既是决策的依据又是决策的产出,制造信息质量对决策质量有决定性影响。指出了制造信息质量的重要性。为了改善制造企业的市场竞争力,必须获取、产出和有效利用高质量制造信息,减少不良制造信息。阐述了制造信息的主要用途。给出了制造信息的质量变量及其评估方法。着重阐述了对制造信息实施全面质量管理的必要性和可行性。讨论了高质量制造信息的应用特点。     

MRPII系统实施与研究

简介韶关宏大齿轮有限公司的SG-MR-PII系统及其实施环境。阐述和探讨了虚拟运行与原型测试、实施层次控制、控制点与阶段评估、单证管理、政策与程序等用于实施MRPII系统的一些方法,简述CIMS环境下MRPII与PDM和财务软件的信息集成方式。     

MRPII系统中盘点管理的研究与开发

在成功开发一套MRPII软件系统的基础上,本文对整个盘点管理策略及软件开发进行了研究。在盘点次数问题方面提出了自已的见解,分析了所设置的符合企业现状的3种盘点类型,提出了减少盘点对生产造成的影响的可操作性的方法。     

Creation and integration mechanism of instrumentation flexible developing system

To solve many key technical problems during the development of modern instrumentation system integration and provide a new mode and fundamental technical equipment for the research and development (R&D) of modern instrumentation products, based on the concept of an instrumentation flexible developing system (IFDS), this paper discusses the creation and open flexible integration mechanism, perfects the integrated supporting environment and integrated system of the flexible interconnection, and constructs the new flexible integrated system. Based on the operation mechanism of the modern instrumentation developing system and the research and optimization of the rapid integration design method, the paper emphasizes the dynamic integrating method of multiple types of knowledge in a modern instrument R&D system, to effectively utilize the rich integrated resource and achieve rapid integration of the system. Applications show that the new IFDS can improve the integration level and efficiency of R&D of the modern instrumentation system, enforce the reliability of the system, shorten the R&D period, and reduce the development costs.     

MRPII、JIT、TOC生产计划与控制比较研究

在对MRPII、JIT、TOC三种生产管理思想的适用性和优缺点分析、比较的基础上,在生产计 划与控制的不同层面,根据不同要求,对MRPII、JIT、TOC 进行了定位分析,并把MRPII定 位在厂级或企业级,负责主生产计划、物料需求及各车间零部件的月、周计划;TOC定位在车 间级,负责车间或工段工序日作业计划与调度、物料的投放;JIT定位在生产现场,负责作业 计划的执行、生产的控制和现场的反馈。     

A proposal for tool-setting data integration

One of the main solutions for reducing NC tool-setting time is based on the use of tool measuring machines (TMM). However, when the tool data are available, a number of issues still remain as to how to transmit the data to the NC tool-data register. The tool information is usually sent to the NC machine on printed labels, resulting in inadequate integration in the manufacturing system. In addition, there is no standard format for storing the tool-setting data in the NC memory, resulting in a wide variety of tool data formats. While it is possible to find commercial solutions for integrating TMM to a large number of NC systems, such solutions require a large postprocessor database. Furthermore, the solutions provided by TMM developers are proprietary, making it difficult to integrate these to other upstream and downstream systems. The main purpose of this work is to propose a methodology to promote this integration on the shop-floor using an open format. This study is based on a review of the related literature and on a survey carried out in 27 metalworking companies. The implementation details of a system for integrating tool-setting data—data integration for tool setting (DITS)—and the successful results of tests carried out on a shop-floor are presented and discussed in this paper.     

A numerical integration method for the determination of flutter speeds

A method of determining the flutter speed of a structural system using a numerical integration method is described. The response of the system to a random disturbance is determined at various wind speeds. From these the system dampings are calculated and the wind speed for which damping is zero is the flutter speed.The method has been developed for application to suspension bridge problems in which the flutter modes are not known functions and to configurations involving structural and aerodynamic nonlinearities.     

TQM与ERP的集成策略探讨

针对TQM与ERP在企业中应用独立的状况，从TQM与ERP的发展背景和特点出发，阐述了两者所具有的内在协调性和互补性关系，从理论、技术、方法与工具等层面上分析了TQM与ERP集成的可行性与必要性，从文化整合、过程整合、技术整合和分步实施等方面探讨了TQM与ERP的集成策略和实施方案。TQM与ERP的有机集成，可以充分有效地整合企业的资源，快速响应市场，提高企业的市场竞争力。     

MRPII系统开发中物料需求计划算法的探讨

探讨了MRPII系统开发中最关键的问题之一,即物料需求计划算法的解决方案。     

MRP Ⅱ系统中主生产计划的关键技术及过程模型研究

主生产计划系统是ＭＲＰⅡ系统的重要组成部分,本文针对ＭＰＳ的特点,详细地分析和描述了ＭＰＳ的功能及处理流程,并对ＭＰＳ的一些关键技术进行了研究。提出了基于Ｐｅｔｒｉ网的ＭＰＳ过程模型和ＭＰＳ基本算法。     

A constant-speed lowering mechanism for the crucibles

The crystal growth characteristics of a certain material can be considerably influenced by the strain present in the growing crystal. Strain can be induced in various ways. One of the most common methods always presents in industrial processes, where attrition processes are always accompanied by generation of mechanical strain in a newly formed small crystal fragment obtained by mechanical stressing during preparation and handling. For this purpose, we have developed an apparatus which comprises a specially designed constant, special lowering device. The system was constructed for use with a Bridgeman furnace made in the laboratory for the crystal growth. The apparatus has been used with a variety of growth assemblies to grow crystals of materials with melting points in the range of 100-1000°C.     

A direct integration approach for the estimation of time-dependent boundary heat flux

In a one-dimensional heat conduction domain with heated and insulated walls, an integral approach is proposed to estimate time-dependent boundary heat flux without internal measurements. It is assumed that the expression of the heat flux is not known a priori. Hence, the present inverse heat conduction problem is classified as a function estimation problem. The spatial temperature distribution is approximated as a third-order polynomial of position, whose four coefficients are determined from the heat fluxes and the temperatures at both ends at each measurement. After integrating the heat conduction equation over spatial and time domain, respectively, a simple and non-iterative recursive equation to estimate the time-dependent boundary heat flux is derived. Several examples are introduced to show the effectiveness of the present approach.