一种氮气加热器制造工艺解析

某厂一种氮气加热器为进口设备,经过十余年的使用,需要更换.该设备在制造过程中的难点是:锥体的放样与压制、U型管束的弯制、焊接工艺的选取等.通过计算分析,对锥体进行了准确的放样,设计并制作了专用成型工装,解决了制造中遇到的难点,最终完成了产品制造任务.     

长线法预制斜拉桥砼箱梁

梧州云龙大桥主桥为2×120米单塔双索面预应力钢筋砼箱梁斜拉桥.对该桥预应力钢筋砼箱梁长线法制造工艺,并及对工艺原理、工艺流程、工序操作及施工优点作了简介.     

GH4169材料波纹管焊接工艺研究

文中通过焊接试验,确定了用于制造波纹管的GH4169材料的焊接工艺,解决了该材料的焊接热裂纹、易烧穿以及咬边的问题.另外,在焊接工装的设计和保护气体的选择方面作了一些有益的尝试,并得到了良好的效果.     

钢管混凝土拱桥钢格子梁监造重点内容探讨

文章以平南三桥钢格子梁的监造为例,介绍了钢格子梁制造的工艺,探讨了原材料进场复验监理、钢板下料及零件加工控制监理、单元件加工制造监理、总成匹配制造监理、焊接质量控制监理等方面的控制重点.     

RAP冷料直投热再生工艺在沥青下面层中的应用

本文结合淮北S101路面施工的实践经验介绍了一种RAP冷料直投工艺,将周边养护项目产生的沥青面层铣刨料在常规拌和站中进行热再生应用,并通过4因素2水平的均匀设计方法对RAP冷料直投后的混合料进行拌和均匀性分析和研究,同时对该工艺下的沥青混合料力学性能进行试验检测,形成了一套在常规拌和站中进行RAP沥青混合料回收料的热再生生产工艺.同时对RAP冷料直投添加系统进行介绍.     

基于智能制造技术的智能机械制造工艺

随着第四次工业革命的到来,智能制造技术已经逐渐渗透到各行各业,智能机械制造工艺也随之应运而生。为了提高机械产品在市场中的竞争力,需要对其进行不断创新与优化。智能机械制造工艺作为一种新兴技术,对于提高机械产品制造工艺具有重要意义。基于此,本文首先阐述了智能制造技术及其在机械制造中的应用,最后提出了基于智能制造技术的智能机械制造工艺的发展趋势。本文的研究成果以期对智能机械制造工艺的应用和发展提供重要的参考,为相关领域的学者和研究人员提供有益的启示和思路。     

关于机械设计制造现代化工艺及精密加工技术的分析

在社会经济持续发展的情况下,一种新型工艺——现代机械设计制造和精密加工技术应运而生,这项技术的效率非常高,它不但是我国机械制造业的关键性技术,而且可以对机械设计的品质进行有效地提升,如果将这项技术加以正确运用,就可以为我国的经济发展提供相关支持。本文着重研究了现代机械的结构和制造工艺,并探讨了其在工业生产中的应用。     

制造工艺对焊管力学性能的影响

为获得从热轧板卷或钢板到成品钢管这一过程中材料力学性能的变化规律,针对国内外对于焊管制造不同工序过程中力学性能变化的研究进行了分析.结果表明：制管工艺对钢管的力学性能有显著影响,主要涉及包辛格效应、加工硬化以及应变时效等.制管成型过程的弯曲变形使材料的屈服强度降低,而随后的扩径和/或水压试验以及涂层加热则会明显提高钢管的屈服强度,影响的程度与具体的制造工艺及工序、强度水平等因素密切相关.     

一种用于蒙乃尔400材料制造的U形管束工艺方案

蒙乃尔400材料是一种价格昂贵的镍基耐腐蚀材料,属于贵重的容器用材,因此有必要研究出一套经济可行的工艺方案。文中以1台用于烷基化装置的该材质U形管束为例,针对制造所涉及主要难点问题,详细论述了制造该设备主要工艺方案,如焊工考试和焊接工艺评定、材料复验、弯管、机械加工、表面处理等需要特别注意的细节问题;重点给出了热处理、组装、焊接及压力试验等难点问题的具体解决措施。按以上的工艺方案,制造出了符合用户质量要求的产品。     

双相不锈钢在GIS波纹管补偿器中的应用

文中介绍了GIS波纹管补偿器的设计及制造工艺。依据双相不锈钢的性能特点,分析探讨了用其设计制造GIS波纹管补偿器的可行性,并介绍了双相不锈钢波纹管管坯的焊接技术。产品检验和型式试验证明:双相不锈钢波纹管能够满足设计参数要求,与奥氏体不锈钢波纹管相比,同样的性能指标,双相不锈钢波纹管层数可大幅减少,在保证产品质量的同时,可明显降低制造成本。     

从中外标准对比看不锈钢管制造技术发展

比较了中国、日本、美国不锈钢管现行标准,从制造方法、钢种类别和数量、尺度规格等方面分析了彼此的差异及我国不锈钢管制造技术和标准化的发展前景.     

6DL发动机散热器材料改进与性能试验分析

文章针对某汽车制造厂6DL汽车发动机水温偏高的问题,制订了三种改进的散热器方案,并对铜制散热器与铝制散热器的性能进行了试验对比分析。结果表明,铝制散热器能较好地解决大马力发动机普遍存在的水温偏高问题。     

An empirical investigation on consumers’ intentions towards autonomous driving

Major steps towards implementation of autonomous and connected transport are being taken nowadays. The trend of automation technology being used in vehicles by the most important vehicle manufacturing industries is expected to move closer to high or fully Autonomous Vehicles (AVs) through technological advancements in sectors of robotics and artificial intelligence. Vehicles with autonomous driving capabilities are planning to be available on market, in full scale, in the next years. In the longer term substantial benefits are mainly expected for accessibility to transport, safety, traffic flow, emissions, fuel use and comfort. All these potential societal benefits will not be achieved unless AVs are accepted and used by a critical mass of people. Addressing these challenges, this paper: (a) proposes a technology acceptance modelling process by extending the original Technology Acceptance Model (TAM) to explain and predict consumers’ intensions towards AVs, (b) based on the proposed TAM-extended framework, a 30-question survey was conducted in order to investigate the factors influencing consumers’ intensions to use and accept AVs. Results show that the constructs of perceived usefulness, perceived ease to use, perceived trust and social influence, are all useful predictors of behavioral intentions to have or use AVs, with perceived usefulness having the strongest impact. The insights derived from this study could significantly contribute to ongoing research related to technology acceptance of AVs and are expected to allow automobile industries to improve their design and technology.     

Survey analysis of supply chain adjustment for Taiwanese information technology firms

Owing to the globalization of industry, the explosion in customer services and product life-cycle compression, most manufacturers have been adjusting the processes and activities of their supply chains to remain competitive and optimize total profit. The aim here was to explore the issues surrounding the changes in manufacturing supply chains and the consequential impact on freight transport demand. A questionnaire to survey Taiwanese information technology (IT) firms was designed and conducted to chart in detail the changes in supply chains of manufacturers, the trends in the international division of labour, and the strategic adjustment of manufacturing and logistics strategies. Surveys and interviews led to the conclusions that (1) vertical integration and international division of labour are very conspicuous among Taiwanese IT firms, (2) there are different strategies of supply chain adjustment at various stages of the product life-cycle, (3) with the transformation of the supply chain, manufacturers require faster transport services, i.e. the demand for air transport may increase and the demand for sea transport may decrease, and (4) once the firms decide on foreign investment, the availability of international transport services becomes one of the considerations for factory offshore relocation. However, transport cost is not a major consideration for firms' supply chain adjustments.     

船用控制台电磁兼容结构设计探讨

随着现代计算机网络技术和智能控制技术的不断进步,对电气控制设备箱体电磁兼容的要求越来越高。本文结合某电磁兼容控制台提出了一种电磁兼容的台体结构设计与同行探讨:设计横截面呈"U"字形及平面矩形的不锈钢框架,与碳钢材料台体壳壁门框孔处以焊接形式固定,配置电磁兼容密封材料,形成完整的电磁兼容结构。实践证明:电磁干扰测试和电磁敏感度测试符合设备正常工作要求,结构简洁,可靠性好,便于MACAD制造。     

Traffic models for goods,service and business movements to manufacturing establishments

This paper is concerned with a problem area of increasing interest, namely the traffic characteristics of specific generators located on non‐residential land use. It concentrates on the problem of modelling traffic generation for goods, service and business movements at the manufacturing establishment. Firstly the contributions of earlier researchers are reviewed in the context of factors which have been considered important. Then a further study conducted by the author in Sheffield and in Manchester, England, is described. This study considers more rigorously than hitherto the questions of similarities in trip rates over different manufacturing activities and geographical areas, and of the choice of explanatory variables. Comparison of regressions is used to formalize indications of similarities in trip rates, and analysis of variance for choosing the most satisfactory explanatory variables. The study provides evidence of similarity in trip rates over seven different manufacturing activities and two geographical areas. It also shows distinctions between different non‐work traffic types in the extent of similarities in trip rates over different manufacturing activities and in explanatory variables for traffic generation relationships. Regarding the latter it is concluded that it is not possible to model accurately such traffic movements on the basis of explanatory variables which are normally available. Instead trip rates should be expressed in simple mathematical terms and should be based on large data populations. The study also makes contributions on peak flow factors for the actual design of facilities of manufacturing establishments. These findings and others are discussed in the context of the work of earlier researchers. Finally conclusions are drawn and guidance offered for future work into this problem.     

高速公路桥梁养护管理对策

文章针对高速公路桥梁养护管理工作所面临的问题，分析了桥梁的常见病害，介绍了桥梁养护管理工作中的检查、检测技术，并提出了相应的桥梁养护管理对策。     

油气管道外检测技术现状与发展趋势

介绍了国内长输管道的现状,分析了油气管道常用的5种外检测方法：PCM管中电流法、直流电位梯度（DCVG）方法、标准管/地电位检测技术（P/S）、电流梯度检测技术（CGDT）、CIPS密间隔电位法。比较了它们在四川地区应用的优缺点,并对其适用性进行了简要阐述。最后,对油气管道外检测技术发展趋势进行了展望。     

Simulating deep CO2 emission reduction in transport in a general equilibrium framework: The GEM-E3T model

Transport sector restructuring to achieve deep GHG emission cuts has attracted much attention because transportation is important for the economy and inflexible in greenhouse gas emission reduction. The aim of this paper is to simulate transition towards low carbon transportation in the European Union until 2050 and to assess the ensuing macroeconomic and sectorial impacts. Transport restructuring is dynamically simulated using a new transport-oriented version of the computable general equilibrium model GEM-E3 which is linked with the PRIMES-TREMOVE energy and transport sectors model. The analysis draws from comparing a reference scenario projection for the EU member-states up to 2050 to alternative transport policy scenarios and sensitivities which involve deep cutting of CO₂ emissions. The simulations show that transport restructuring affects the economy through multiple channels, including investment in infrastructure, the purchasing and manufacturing of new technology vehicles, the production of alternative fuels, such as biofuels and electricity. The analysis identifies positive impacts of industrial activity and other sectors stemming from these activities. However, the implied costs of freight and passenger transportation are of crucial importance for the net impact on GDP and income. Should the transport sector transformation imply high unit costs of transport services, crowding out effects in the economy can offset the benefits. This implies that the technology and productivity progress assumptions can be decisive for the sign of GDP impacts. A robust conclusion is that the transport sector decarbonisation, is likely to have only small negative impacts on the EU GDP compared to business as usual.     

改进的螺栓紧固夹具在输气管道缺陷修复中的应用

根据管道内检测与完整性评价报告,某输气管道存在6处本体缺陷需进行修复。为满足不停输修复的要求,在分析钢质环氧套筒、螺栓紧固夹具等常见管道缺陷修复方式特点的基础上,对螺栓紧固夹修复技术提出改进,实现了不停输状态下的管道本体缺陷的修复。结合改进后螺栓紧固夹具的现场实际应用,进一步研究了该修复方式的优缺点,对管道本体缺陷修复技术选择与应用具有参考意义。