由三维参数化模型生成工程图的自动调整技术

针对由三维参数化模型自动生成的工程图中视图布局较差,比例不合理,尺寸标注不整洁,线条繁杂,注释错误等缺点,根据企业给定的工程图模板及相应标准,研究了工程图模板创建与保存方法、三维模型驱动后工程图视图布局、比例、特征尺寸、焊接符号、零件序号的调整方法,以及部件图明细表的自动生成与调整方法.     

基于免疫遗传算法的工程图自动调优技术

针对目前三维模型参数化变型后,工程图自动生成方法中出现的视图布局不合理、比例失调、标注混乱等问题,及现有调图技术的局限性,论文提出采用免疫遗传算法对工程图进行优化调整。实现了基于模板参数化驱动后工程图的自动更新与视图布局、视图比例及其各种标注位置等的优化调整。实验证明该方法可以实现智能化快速出图,保证设计的准确性,提高设计效率和质量。     

检验工程图中尺寸封闭的算法

对用计算机绘制的工程图中尺寸标注的封闭现象进行了分析。将尺寸标注系统转换成无向图的形式,然后采用一种智能路径搜索的算法,对无向图所对应的邻接矩阵进行遍历,完成对整个标注系统中的所有尺寸标注搜索的过程。通过邻接矩阵的状态变化来对工程图中尺寸标注的封闭现象进行检验。这种新的计算方法实现了在一个标注系统中对多个尺寸封闭现象的无丢失查找。     

立式袋装机三维数字模型生成二维工程图的实现

探讨利用Solid Edge软件对立式袋装机设计过程中,三维参数化模型自动生成的工程图时的视图布局较差,尺寸标注不整洁,线条繁杂等缺点,研究了如何根据国家标准,设置工程图模板、零件图与剖视图生成与调整方法、以及部件图明细表的自动生成与调整方法.从而使立式袋装机三维参数化模型快速生成符合国家标准的二维工程图.     

比例参数在参数化工程图样生成中的应用研究

在开发AutoCAD的参数化设计软件中,不同比例工程图样的生成和布局设置存在字体和标注难统一的问题.论文中介绍了针对程序设计和图样生成来调用比例因子的方法,解决了CAD系统中字体、标注难统一,灵活布局困难的问题.保证了在任意比例下生成的工程图样,其中的文字高度和尺寸标注均符合国家标准的要求,并满足了灵活布置图面的要求.     

基于ObjectARX开发工程图模块的研究

三维实体建模在机械产品的设计过程中得到了广泛应用,但二维工程图仍是当前指导生产和进行技术交流必不可少的文件。为了从三维实体模型快速得到二维工程图,利用ObjectARX二次开发工具,在AutoCAD平台上开发工程图模块,实现了实体模型向工程图的快速转化以及自动标注。工程图生成在模型空间,方便后续操作。通过实例证明该工程图模块能够从特征实体模型中提取工程图的相关信息,快速生成二维工程图,大大提高用户的工作效率。     

工程图技术要求自动生成工具的设计与实现

针对我国企业用户的应用需求,实现了工程图技术要求自动生成工具。本文着重阐述了设计过程中技术要求数据库的设计、工程图技术要求自动生成工具与数据库、AutoCAD系统的通讯以及实现自动标注等关键技术,并给出了具体开发实例,从而简化了技术要求的标注操作和技术要求数据管理。     

《福建分析测试》参考文献编排规则

引用参考文献需按照引文先后在文中标出序号,并与文后参考文献序号一致,用[1],[2]…标注,正文中未标注序号的文献列于标注序号文献之后。参考文献一律置于文末。格式:期刊[序号]作者.文题[J].刊名,年,卷(期):起止页码.     

《福建分析测试》参考文献编排规则

<正>引用参考文献需按照引文先后在文中标出序号,并与文后参考文献序号一致,用[1],[2]…标注,正文中未标注序号的文献列于标注序号文献之后。参考文献一律置于文末。格式:期刊[序号]作者.文题[J].刊名,年,卷(期):起止页码.     

《福建分析测试》参考文献编排规则

<正>引用参考文献需按照引文先后在文中标出序号,并与文后参考文献序号一致,用[1],[2]…标注,正文中未标注序号的文献列于标注序号文献之后。参考文献一律置于文末。格式:期刊[序号]作者.文题[J].刊名,年,卷(期):起止页码.专著[序号]章节作者.书名[M].版次.出版地:出版者,出版年:起止页码.     

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