基于VSM/A的单件工程式生产精益分析

为在单件工程式生产企业推行精益生产,应用VSM/A绘制HT汽轮机厂某转子生产的现状价值流图,确定生产中存在的非增值环节。应用拉动式看板、均衡生产、准时化物流等精益生产理论,缩短非增值时间并绘制未来价值流图。通过方案实施,增值时间缩短了71 h,非增值时间缩短了28 d,搬运距离缩短了1 756 m,增值比增加了448%,证明了应用价值流图技术对单件工程式生产企业进行精益分析具有良好的实用价值。     

基于价值流视域下的AIP公司生产流程改善研究(上)

以提高企业运作效率为核心,选取AIP公司轮胎生产线的优化作为本次研究案例,首先,通过绘制现状价值流图,达到生产线的现状可视化,分析工艺布局与物流和信息流的活动,找出当前生产模式中存在的增值与非增值环节;其次,运用精益思想和工业工程的方法,对生产流程进行分析与改善,引入看板拉动式和连续式生产等方法,以节拍平衡方式进行生产,压缩非增值时间、消除信息阻碍、减少作业人员和在制品库存等,使生产周期及产能得到有效改善;再次,采取工序重组、流程优化等改善手法,对生产流程进行精简,并绘制未来价值流图作为重点改善方向,从而实现生产线的再设计;最后,通过价值流图的前后对比发现:企业产能、设备利用率及生产周期改善显著,在提高产品质量的同时有效地降低了生产成本。     

基于价值流视域下的AIP公司生产流程改善研究(下)

本文以提高企业运作效率为核心,选取AIP公司轮胎生产线的优化作为本次研究案例:首先,通过绘制现状价值流图,达到生产线的现状可视化,分析工艺布局与物流和信息流的活动,找出当前生产模式中存在的增值与非增值环节;其次,运用精益思想和工业工程的方法,对生产流程进行分析与改善,引入看板拉动式和连续式生产等方法,以节拍平衡方式进行生产,压缩非增值时间、消除信息阻碍、减少作业人员和在制品库存等,使生产周期及产能得到有效改善;再次,采取工序重组、流程优化等改善手法,对生产流程进行精简,并绘制未来价值流图作为重点改善方向,从而实现生产线的再设计;最后,通过价值流图的前后对比发现:企业产能、设备利用率及生产周期改善显著,在提高产品质量的同时有效地降低了生产成本。     

基于价值流图的生产线再设计:案例研究

对一汽车车轮饰盖生产线进行了再设计的研究。通过对其生产流程的分析,绘出了现有生产线的价值流图。利用该图,找出了当前生产模式中非增值的操作。然后通过减少或消除非增值环节,绘制出改进的价值流图,从而实现生产线的再设计。通过生产现场的系统化改善,产品生产周期缩短了50％,物料搬运距离缩短了54％,同时提高了产品质量,降低了生产成本。     

基于价值流图的抽油杆生产线平衡优化研究

以价值流图为工具对Z厂抽油杆流水线存在的平衡率低、物流信息流不合理等问题进行了分析,并运用价值流改善方法进行了工序重组,引入拉动系统控制生产节奏,采取混流生产以提高作业的连续性和均衡性.在此基础上,用工时均衡手法优化工序瓶颈,使生产线工序数目减少了29.4％,生产线平衡率提高了24.3％,制造周期缩短了55.3％,有效地提高了生产效率.     

基于价值流及仿真分析对于回转支承生产线的改善

利用价值流对传统的机械加工厂进行分析,发现其物流混乱以及生产线平衡率较低等问题,利用精益生产的方法,制定改善方案。针对价值流只能静态短时间内反映生产情况,本文将价值流与Flexsim软件结合,以弥补价值流缺陷。与传统通过规划设计未来价值流不同,本文利用仿真软件确定价值流图各个工序之间的间隔时间以及超市容量。     

空调生产中的价值流分析及其改善

美的集团在现有空调生产过程中引入价值流管理.在实施过程中同时结合动作分析.SOE分析以识别现有价值流中的增值和非增值环节,进而基于5W1H、ECRS原则对现有生产线进行平衡、改善.最终形成价值流创新方案.经实测比较:目标生产线改善后生产效率提高50%.周期缩短2377S.能满足现有市场需求.     

装配类小微的流水线价值流分析与精益改善研究

在"企业集团小微化"背景下,针对装配类小微的生产现状,构建融合DMAIC(Define,Measure,Analysis,Improve,Control)过程的价值流分析模型(DMAICVSM),并在建立价值流成熟度模型的基础上,利用BP神经网络进行价值流成熟度评定.以当前价值流成熟度为改进起点,以未来价值流成熟度为改进目标,量化改进空间并规划成熟度进化路线,达成对装配线的持续改进.结合某装配类小微的生产实际,验证了DMAIC-VSM的可行性.     

基于价值流的胖轴精益生产分析

为提高胖轴作业效率,通过调查,首先应用价值流图技术,绘制当前状态图,分析胖轴加工过程中存在的生产计划、在制品库存、生产方式等问题,区分胖轴加工中的增值和非增值部分;然后,依据精益思想和工业工程的基本手法,提出平衡物流、合并工序、拉动生产等改善措施,绘制未来状态图作为改善的路标。实施后,胖轴批量加工时间比原来减少54％,形成均衡、拉动生产,减少了在制品库存,使生产过程大为精简。     

基于价值流的汽车座椅滑轨生产线分析与改善

以华瑞汽车座椅滑轨生产线为例,论述了应用价值流图技术进行生产现场系统改善的过程.首先根据该厂生产线现状和价值流图的符号,以可视化的方式描述生产线的现状,然后结合工业工程的基本分析方法,找出了该厂生产线中所存在的设施布置、搬运、等待、设备不足等制约产能的瓶颈问题,区分了生产中的增值和非增值的环节.最后寻找消除这些浪费环节的方法,对生产线按精益原则布置,绘制出了未来状态图,帮助管理者准确地拟定未来的改善方案.通过生产过程的实施带来产能和经济效益显著变化.     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to