大型斜齿轮齿向误差在位测量的新方法研究

本文提出了一种用空间直线作为测量基淮对被测大型斜齿轮齿向误差进行在线测量的新方法，给出了该方法的测量原理和数学模型，并讨论了通过误差分解得到相邻两齿面齿向误差的方法．     

大齿轮齿形误差在位检测的一种新方法

本文提出了用测量头的直线运动轨迹做基准来在位检测大齿轮渐开线齿形误差的新方法，建立了在统一坐标系中的齿部理论渐开线数学模型和测量头轨迹方程以及经原理误差补偿后的齿形误差计算模型，解决了定位精度问题。这种新方法特别适用于大齿轮齿形误差在位检测仪器的研制和开发。     

发动机凸轮升程误差的评定方法

通过对发动机凸轮升程误差曲线的分析，提出了按“最小条件”评定凸轮升程误差的判别准则，从而避免了因测量基准不同而引起误判。     

精密分度蜗轮跨齿补点测量法的研究

一分度蜗轮副是滚、插齿机的心脏,它决定着滚、插齿机的精度和齿轮加工质量。精度高于5级的分度蜗轮副需要用动态精度指标切向综合误差△F＇_i来衡量,这就需要单啮仪等动态测量设备来测量。在没有这些仪器时,可用周节累积误差△F_P,的测量来代替。对于模数 m=1～10,直径D=380mm,齿数小于100的蜗轮可直接用万能测齿仪以相对法测量,对于精度要求较高齿数>100,直径>380mm的蜗轮借助于圆转台及测齿仪测量托架组合装置用跨齿补点法测量。所谓跨齿测量就是指用比较法测量蜗轮周节时,测齿仪的两测量爪跨的齿数不少于两个,显然跨齿测量得到的周节累积误差小于单齿测量的累积误差,因此须进行补点,予以校     

齿轮滚插齿加工过程中偏心产生的原因及检测方法

汽车行业变速器齿轮滚插齿加工过程中,由于受到机床传动链误差、夹其制造安装误差及齿坯定位基准精度影响,不可避免的产生偏心,影响齿轮加工精度。尽可能的减小偏心,将提高齿轮加工精度。     

关节臂式柔性三坐标测量系统的数学模型及误差分析

关节臂式柔性三坐标测量系统是一种新颖的基于旋转关节和转动臂的三坐标测量系统，以角度测量基准取代了长度测量基准，它具有量程大、体积小、重量轻及使用灵活等优点．首先基于Denavit-Hartenberg方法建立了关节臂式柔性三坐标测量系统的理想数学模型和误差模型，并通过几何作图法对模型进行了验证．根据系统的特点和通过对系统中实际存在的影响测量结果的各种误差因素进行了详细分析，为进一步研究系统的误差补偿提供了理论基础．     

齿轮检测过程中的微机测量控制系统

用计算机控制３０２１渐开线检查和万能测齿仪对齿轮齿形误差、齿向误差、齿距误差进行自动测量和评定，并将测量结果等原始记录计算机管理．本文介绍了该系统的硬件配置、系统工作原理及主要软件模块．     

滚齿加工中滚刀的合理使用

在滚齿加工中,滚刀的制造精度、安装误差、重磨误差对齿轮加工精度有很大影响,这就要求我们在滚齿加工中合理地使用滚刀,控制滚刀在滚切齿轮时造成的齿轮加工误差,提高齿轮加工质量。     

多齿分齿盘在三坐标测量机上的测量

1分齿盘的特性多齿盘是加工齿轮运动精度和平稳精度的重要I装，是对齿轮加工中相邻齿距差和累积误差的直接最响者。所以分齿盘的相邻差和累积误差要求准确度出别高。IB393／JSS一1005分齿盘的技术条件是：138齿相邻误差为0．005mm；最大累积误差为0．01mm；外径四508mm；齿槽角度、尺寸和跳动如附图。2测量方法（l）将分齿盘擦净，牢固地固定在测量机工作台上。（2）将标准心轴放人齿槽内，用垫铁和橡皮泥将心轴固定好。（3）以端面、止口和广齿槽为基准建参考系。（4）用圆／轴窗口进行逐齿槽心轴中心的测量。（5）输出格式：PR、PA、…     

啮合法测量斜齿齿向误差

本文介绍了一种测量齿向误差新方法──啮合法，它利用精密圆柱面和渐开螺旋面之间的啮合特性，将齿向误差转化为啮合运动偏差测量。理论分析和测试结果表明：啮合法可利用齿形误差展成系统测量齿向误差。     

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.……     

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.     

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     

Win-Win Cooperation

正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in     

Systematic Approach for Emerging Industry

正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration.     

Strictest Pollutants Emission Standards

正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions.     

Instructions to Authors

New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope     

Progress on Standards Copyright Protection

正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection.