基于DELMIA的载人离心机座舱装配仿真

目的 形成合理的座舱装配工艺方案,提高装配质量和效率,并能在设计阶段发现座舱装配工艺方案存在的问题。方法 通过分析座舱结构特征和装配特点,并基于DELMIA数字化制造仿真平台,对载人离心机座舱的装配信息进行构建与分析。运用干涉和碰撞检查,结合人机功效模块,对座舱装配过程进行仿真分析。结果 座舱装配仿真是验证其装配工艺方案是否合理的有效手段,通过座舱装配仿真,提前发现了装配工艺方案存在装配动态干涉、可达性和可视性等问题。结论 数字化装配技术可以帮助设计人员预先发现装配工艺方案的不足,改进装配工艺方案,验证装备工艺方案的可行性,为实际装配提供指导,进而可极大地提高装配效率,缩短装备研制周期。     

手扶拖拉机手把座弯曲成形后开档变小

1零件特点如图1所示的U形弯曲件EM31型手拖中的手把座,采用的材料为A3钢,料厚为3mm.为了保证手把座与变速箱顺利装配,要求弯曲成形保证左端的开档尺寸122_0~(+1.0).手把座右端的开档尺寸要求不高,即使略微超差也不影响装配和使用.     

冲压用低碳钢的球化退火处理效果

此文探讨了低碳钢的球化退火热处理工艺,重点讨论了球化处理措施对低碳钢冲压件冲压工艺性能的影响效果,为提高冲压件产品合格率可行热处理工艺的制定提供参考。     

大型复杂冲压件CAPP的发展趋势

讨论了大型复杂冲压件计算机辅助工艺设计中数值模拟技术的应用、系统模型与工艺决策等关键技术的发展 ,以及CAPP与相关系统的集成 ,分析了大型复杂冲压件计算机辅助工艺设计的发展趋势。     

汽车悬挂横梁的热压成形

我厂生产的产品以冲焊结构为多,冲压件的品种,数量在产品总的零部件中占有很大的比例。无论在军品和民品中,都有许多由中厚钢板制造的冲压件,厚度由5mm 到4Dmm 不等,材料既有普通和优质炭素钢 A3,4D,也有低合金结构钢30CrMnSi,09Mn-Rel 等。为保证产品质量,防止开裂,以及从模具强度和设备负荷几方面考虑,对中厚钢板冲压件往往采用热压成形。现以铁马牌载重汽车的悬挂横梁为例,介绍中厚钢板热压成形的工艺制定,模具设计及操作中应注意的几个问题。     

引起汽车发盖变形的涂装工艺改进

汽车发盖是车身外观件,其自身外观的平整美观与否直接影响客户对汽车感知质量的评价,因此保证发盖外观的完整是非常重要目前我们公司生产的五菱宏光车型（以下简称为CN100）．在进行涂装工艺过程中,其发盖为工艺单点支撑,导致过完涂装工艺后,发盖变形严重,引起整车发盖的尺寸配合问题及外观凹陷问题。因此本文针对引起发盖变形的涂装工艺进行改进,以保证发盖的过程质量,同时为后续车型的涂装工艺提供参考     

洗涤电机下端盖拉延工艺分析

对洗涤电机下端盖拉延工艺作了具体的分析，该零件3次共4道工序拉延才能成功，其难点在于毛坯尺寸的确定和工艺尺寸的保证。     

国产冲压板复杂路径下的成形限极

一、前言成形极限曲线(FLD)是衡量冲压用薄板在成形过程中成形能力的极为有用的工具,对于汽车、电器设备,家用器皿等等行业中冲压件材料的合理选择,正确的工艺制定有很大的指导作用。近年来,国内对薄板成型性能的研究也日趋活跃,许多工厂、学校和研究单位致力于应用FLD进行冲压件的应变分析,以求合理地选材和制定工艺。     

从日产皮卡汽车国产化看冲压件产品与工艺的结合

从工艺角度对汽车冲压件设计过程进行了分析,综合出简化汽车部件设计的程序,指出汽车零件设计的一个实用方向。     

压盖落料冲孔成形模设计

介绍了在尺寸公差及形位公差要求较高的落料冲孔成形件的模具设计过程中，不降低劳动效率的情况下，如何使模具简化、降低模具成本，并使冲压件满足其设计要求。     

A graphical representation of carbon footprint reduction for chemical processes

Climate change has recently become a major focus for industry and government agencies. Some recent works have been reported on the use of pinch analysis techniques for carbon-constrained energy planning problems. This paper discusses a new application of graphical technique based on pinch analysis for company-level visualization and analysis of carbon footprint improvement. The technique is based on the decomposition of total carbon footprint into material- and energy-based components, or alternatively, into internal and external components. The decomposition facilitates the evaluation and screening of process improvement alternatives. Two industrial case studies on the production of phytochemical extracts and bulk chemicals are used to illustrate the new extension.     

环境空气质量改善导向的财政资金分配模型与实施机制

"十三五"时期改进环境空气质量是首要任务,如何充分发挥财政资金对地方环境质量改善的引导和激励功能。文章提出了基于环境空气质量导向的财政激励资金分配模型和实施机制,并以2014~2015年的城市PM监测数据2.5进行了案例分析,结果表明该分配模型和实施机制具有科学性和可操作性,可以为建立环境空气质量导向的财政机制提供管理技术支撑。     

Collaborative activity with business partners for improvement of product environmental performance using LCA

Collaborative activities with business partners have potential to improve environmental performance of product and life cycle assessment (LCA) is an essential technique to implement eco-design of product and production process. However, collection of LCA data from supply chain is a major issue for LCA practitioners. We propose a Supply Chain Collaboration Model (SCCM), which is a framework for collecting producer-specific LCA data from business partners and for promoting improvement activity of product environmental performance. We demonstrate the practicability of the SCCM using three case studies. In each case study, two or three partner companies organized a product improvement project and carried out process analysis techniques such as LCA and material flow cost accounting (MFCA). As a result, improvement activities from the economical standpoint could provide an incentive for business partners to collect LCA data, and thus the SCCM is an effective framework for eco-design.     

关于煤粉工业锅炉的技术分析与政策思考

在技术进步和政策的推动下,煤粉工业锅炉的应用正在形成高潮,但存在技术上的不实宣传和推广政策偏向问题。为使该技术能健康和可持续地发展,本文针对该锅炉的效率、污染物排放、制粉配送、风险和经济效益以及推广政策等方面,做了较深入的研究。研究认为该锅炉有高效节煤、SO2和NOx排放总量下降、集中配送煤粉和锅炉房干净等优点,值得推广;但因粉尘排放总量和浓度上升,综合环保效果处于劣势,同时存在电耗较大、煤源要求苛刻、煤粉储运和使用有风险,及经济效益不确定等问题,因此必须根据全面的技术、环境和经济评价,因地制宜地推广。建议政府采取具体措施,如资助布局优质煤粉供应点,以节能减排实效为资助的依据,鼓励专业锅炉制造厂参与研发和竞争,制定地方和国家有关煤粉工业锅炉的制造、用煤和污染物排放等标准,使该技术不断完善,可持续地发展。     

遗传工程菌Fhhh降解精对苯二甲酸与mnp基因表达

跨界融合构建的遗传工程菌Fhhh及其亲株黄孢显毛平革菌 (PC) ,降解精对苯二甲酸的比降解率受到Mn2 + 、酒石酸铵、H2 O2 、pH共 4因素的影响 .除pH值外 ,其余 3个因素影响 2菌株比降解率大小的排序完全一致 .pH值对PC菌的影响排序处于第 3位 ,对Fhhh则处于第 1位 .Fhhh比降解率比PC高出 11 11% ;mnp基因表达的锰过氧化物酶 (MnP)比活力水平比PC高出 15 2 2 % .降解精对苯二甲酸 4因素优化水平 ,也是mnp基因表达的优化条件 .比降解率与MnP的比活力水平之间有显著或极显著正相关性 (r>r0 .0 5( 4) ,r >r0 .0 1( 4) ) .研究结果为高效处理精对苯二甲酸废水提供了重要的分子生物学依据     

Intensification of adsorption process by using the pyrolytic char from waste tires to remove chromium(Ⅵ) from wastewater

Pyrolysis has the potential of transforming waste into valuable recyclable products. Pyrolytic char(PC) is one of the most important products from the pyrolysis of used tires. One of the most significant applications for pyrolytic char recovered is used for the removal of Cr(Ⅵ) in the wastewater effluent to control waste by waste. The surface chemistry properties of surface element distribution / concentration and chemical structure were examined for the pyrolytic char and the commercial activated carbon(CAC) respectively. The results showed that surfaces of PC possesses a large amount of ester and hydrocarbon graft, whereas there are mainly carbon functional components of C-OH, C=O and COOH on the surface of CAC. Therefore the surface electronegativity of PC is lower than that of CAC in the water. The repulsive interactions between the surfaces of PC and the negatively charged Cr(Ⅵ) ion are weaker than that of CAC, which results in an intensification of the adsorption process by the utilization of PC. The adsorption isotherms of Cr(Ⅵ) ion on the two kinds of carbons were determined experimentally. The larger adsorption amount on the PC in the case of Cr(Ⅵ) may be attributed mainly to its special surface micro-chemical environment. The mechanism of the removal Cr(Ⅵ) from aqueous solution was assumed to be the integration of adsorption and redox reaction. The adsorption was the rate-controlled step for Cr(Ⅵ) removal. The adsorption of Cr(Ⅵ) has been identified as pseudo-second- order kinetics. The rate constants of adsorption have been evaluated.     

Intensification of adsorption process by using the pyrolytic char from waste tires to remove chromium(Ⅵ) from wastewater

Pyrolysis has the potential of transforming waste into valuable recyclable products. Pyrolytic char (PC) is one of the most important products from the pyrolysis of used tires. One of the most significant applications for pyrolytic char recovered is used for the removal of Cr( Ⅵ ) in the wastewater effluent to control waste by waste. The surface chemistry properties of surface element distribution/concentration and chemical structure were examined for the pyrolytic char and the commercial activated carbon(CAC) respectively. The results showed that surfaces of PC possesses a large amount of ester and hydrocarbon graft, whereas there are mainly carbon functional components of C-OH, C=O and COOH on the surface of CAC. Therefore the surface electronegativity of PC is lower than that of CAC in the water. The repulsive interactions between the surfaces of PC and the negatively charged Cr（Ⅵ ) ion are weaker than that of CAC,which results in an intensification of the adsorption process by the utilization of PC. The adsorption isotherms of Cr( Ⅵ ) ion on the two kinds of carbons were determined experimentally. The larger adsorption amount on the PC in the case of Cr( Ⅵ ) may be attributed mainly to its special surface micro-chemical environment. The mechanism of the removal Cr( Ⅵ ) from aqueous solution was assumed to be the integration of adsorption and redox reaction. The adsorption was the rate-controlled step for Cr( Ⅵ ) removal. The adsorption of Cr( Ⅵ )was identified as pseudo-second-order kinetics. The rate constants of adsorption were evaluated.     

硫化矿石自燃倾向性的实验室测定方法与应用

硫化矿石自燃的防治一直是含硫矿床面对的主要安全问题。准确地测定硫化矿石自燃倾向性．对保护工人生命安全、保证矿山正常生产、充分利用矿产资源等具有十分重大的意义。通过对现有硫化矿石自燃倾向性测定方法进行全面而系统的分析．介绍了一种可靠的硫化矿石自燃倾向性的实验室测定方法．并对每一个步骤做了具体的阐述。最后,将该方法应用于矿山实际．得到了准确的测定结果。     

A review of Australian approaches for monitoring,assessing and reporting estuarine condition: II. State and Territory programs

In contrast to Europe, the USA and South Africa, Australia has no specific, overarching federal legislation to underpin a nationally-coordinated framework for monitoring, assessing and reporting estuarine condition. This has resulted in a complex mosaic of diverse approaches and governance structures, hindering the ability to make inter-State comparisons. In this second part of a comprehensive three-part review, we present a systematic appraisal of current and impending approaches for measuring and reporting estuarine condition in each of Australia’s States and Territories. A concise summary is provided in each case, supported by extensive appendices containing detailed accounts of relevant monitoring and reporting programs. We synthesise and evaluate this output at the State/Territory level, highlighting areas of improvement and major gaps.     

The use of Procrustes Target Analysis to discriminate dominant source regions of fine sulfur in the western U.S.A.

Receptor modeling, using Procrustes Target Analysis (PTA), was applied to a fine sulfur data set to discriminate dominant sources and areas of influence in the western U.S.A. The work presented in this note is closely linked to a paper published by Malm et al. (Atmospheric Environment24, 3047–3060, 1990), which used two different analyses, area of influence analysis (AIA) and rotated principal component analysis (RPCA), to show similar areas of influence for most source regions in the western U.S.A. A critical examination of RPCA revealed that two issues might confound interpretations. These are (i) eigenvalue degeneracy combined with trying to fit nine orthogonal dimensions pairwise in the PC space and (ii) statistical issues related to missing data and eigenvector truncation. In determining how much of the AIA results are present in the data spanned by the PC space, our findings indicated a 164% improvement in the variance overlap when PTA was substituted for RPCA.