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卡车中地板工艺优化及降低成本的方法
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作者 黄源焘 李林 许学友 《模具工业》 2022年第1期37-40,共4页
以某卡车驾驶室前中地板为研究对象,由于原工艺不合理,出现了零件成形质量不稳定的情况,在不影响零件搭接关系的前提下,通过修改工艺补充面、更改拉深方式以及零件局部造型变更等方式,并经过CAE模拟分析,重新制定新的工艺方案和模具结构... 以某卡车驾驶室前中地板为研究对象,由于原工艺不合理,出现了零件成形质量不稳定的情况,在不影响零件搭接关系的前提下,通过修改工艺补充面、更改拉深方式以及零件局部造型变更等方式,并经过CAE模拟分析,重新制定新的工艺方案和模具结构,在提高零件成形合格率的同时,降低模具制造的成本,提高材料利用率,为类似件降低制造成本提供了参考。 展开更多
关键词 卡车 中地板 模具制造 优化方案 降低成本
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低地板与中地板有轨电车和轻轨车的发展
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《电气牵引》 2015年第2期6-17,共12页
像2014年柏林Innotrans展览会显示的情况一样(见《Stadtverkehr》11/2014),有轨电车企业正处在一个转折点。会上展出了16台有轨电车与轻轨车,仅有3台出于西方经典的大企业,阿尔斯通,庞巴迪与西门子,
关键词 中地板有轨电车 轻轨车 地板 大企业 展览会 西门子
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某车型中地板工艺及模具设计
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作者 杨波 张懃 《模具制造》 2014年第6期9-12,共4页
微卡中地板的腹板起伏变化很大,成形很困难,工艺设计的好坏将决定其成败。本文重点介绍了某车型中地板拉伸工序件的设计方法和要点,其中采取波浪型压料面和窗口填平采取中间凸起与腹板面随形是其两大特点。
关键词 中地板 工艺设计 模具设计
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白车身中通道地板抗凹性能优化及影响因素研究
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作者 刁杰胜 《机械科学与技术》 CSCD 北大核心 2024年第5期765-772,共8页
针对某白车身中通道地板存在的抗凹问题,建立有限元模型并计算;通过计算得到地板抗凹性能指标数值;并将试验结果和有限元模型计算结果进行对比,两者有较好的一致性,有限元分析方法有效;用正交试验搜寻地板最优抗凹性能参数组合,以横向... 针对某白车身中通道地板存在的抗凹问题,建立有限元模型并计算;通过计算得到地板抗凹性能指标数值;并将试验结果和有限元模型计算结果进行对比,两者有较好的一致性,有限元分析方法有效;用正交试验搜寻地板最优抗凹性能参数组合,以横向加强筋深度、材料牌号和钣金厚度为研究因素,每个因素设计3个水平,建立正交表L_(9)(3^(4))并完成9组有限元模型计算;对分析结果进行方差和极差分析,得到各因素水平对地板各抗凹性能指标影响,最终得到最优参数组合。本文研究结果为中通道地板抗凹性能设计提供参考依据,对工程应用有较大意义。 展开更多
关键词 白车身 通道地板 抗凹性能 有限元模型 正交试验
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中、低地板有轨电车和城轨车的发展(上)
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作者 HarryHondius 姜寄复 《电气牵引》 2002年第1期22-38,共17页
关键词 有轨电车 城轨车 中地板 地板
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中、低地板有轨电车和城轨车的发展(上)
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作者 HarryHondius 《电气牵引》 2003年第2期15-31,共17页
关键词 中地板有轨电车 地板有轨电车 城轨车 发展 电气部件 机械部件
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中、低地板有轨电车和城轨车的发展(下)
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作者 HarryHondius 《电气牵引》 2002年第2期16-39,共24页
关键词 中地板有轨电车 地板有轨电车 城市轨道车
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一种提升地板中通道材料利用率的优化工艺方案 被引量:2
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作者 肖海东 袁河清 伍二 《模具技术》 2018年第3期44-48,共5页
某汽车地板中通道常规的冲压工艺方案是直接采用拉深工艺,将产品的绝大部分形状一次拉深到位,后工序再对法兰搭接面进行整形,得出最终产品。但是经过AutoForm软件对该工艺方案分析后发现:其零件的成形性较差,拉深成形力较高,约9 400kN,... 某汽车地板中通道常规的冲压工艺方案是直接采用拉深工艺,将产品的绝大部分形状一次拉深到位,后工序再对法兰搭接面进行整形,得出最终产品。但是经过AutoForm软件对该工艺方案分析后发现:其零件的成形性较差,拉深成形力较高,约9 400kN,且材料利用率较低,约63.50%。通过对地板中通道的一次拉深到位+局部整形的工艺方案进行研究,分析了成形性较差的原因,提出了一种优化的拉深+翻边整形的成形工艺方案,实现了零件成形性的改善,降低了拉深成形力,同时大幅度提升了材料利用率。 展开更多
关键词 工艺方案 材料利用率 地板通道
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木质地板生产技术 被引量:1
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作者 孙友富 郭琪伟 《林业科技开发》 1999年第5期19-21,共3页
关键词 木质地板 生产技术 拼花地板 长条地板
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木质地板的种类及安装 被引量:1
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作者 路则光 吴智慧 《人造板通讯》 2002年第8期12-14,共3页
1木质地板的现状 我国地板业近几年发展迅速,据统计,2000年地板销售量达到1乙m2,年销售额120亿元以上.
关键词 木质地板 种类 安装 拼花地板 长条地板 立木地板
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两种竹束地板坯料的结构与工艺比较
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作者 赵仁杰 赵星 《竹子研究汇刊》 北大核心 2015年第2期12-14,共3页
通过分析比较两种竹束地板坯料的结构、工艺及其生产成本,认为用竹束帘按奇数层且相邻层互相垂直组坯胶合而成的中竹地板坯料,比用竹束篾全顺纹铺装高压胶合而成的重竹地板坯料具有产品结构合理、工艺先进、性能良好且生产成本低的优点... 通过分析比较两种竹束地板坯料的结构、工艺及其生产成本,认为用竹束帘按奇数层且相邻层互相垂直组坯胶合而成的中竹地板坯料,比用竹束篾全顺纹铺装高压胶合而成的重竹地板坯料具有产品结构合理、工艺先进、性能良好且生产成本低的优点,是一种性价比较高的新产品,将有较好的市场前景。 展开更多
关键词 竹束篾 竹束帘 坯料结构 地板 重竹地板
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拉深模压边时坯料下塌的解决方法
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作者 张秀利 李学坤 于旭明 《模具工业》 2021年第2期22-24,共3页
大型薄板汽车零件拉深成形过程中,当坯料放置在压边圈上时薄板中间会下塌,模具闭合时会产生褶皱,导致成形的零件表面产生缺陷。以中地板零件为例,对坯料下塌问题的产生和解决措施进行介绍,并描述采用活动凸模消除坯料下塌的方法,利用机... 大型薄板汽车零件拉深成形过程中,当坯料放置在压边圈上时薄板中间会下塌,模具闭合时会产生褶皱,导致成形的零件表面产生缺陷。以中地板零件为例,对坯料下塌问题的产生和解决措施进行介绍,并描述采用活动凸模消除坯料下塌的方法,利用机床顶杆实现活动凸模对坯料的有效承托,消除了成形零件压伤风险,保证了零件的成形质量。 展开更多
关键词 拉深模 坯料下塌 浮动凸模 中地板
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The Active Yakutat (Kula?) Plate and Its Southcentral Alaska Megathrust and Intraplate Earthquakes
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作者 John W. Reeder 《Journal of Earth Science and Engineering》 2016年第1期18-58,共41页
Alaska geology and plate tectonics have not been well understood due to an active Yakutat plate, believed to be part of the remains of an ancient Kula plate, not being acknowledged to exist in Alaska. It is positioned... Alaska geology and plate tectonics have not been well understood due to an active Yakutat plate, believed to be part of the remains of an ancient Kula plate, not being acknowledged to exist in Alaska. It is positioned throughout most of southcentral Alaska beneath the North American plate and above the NNW subducting Pacific plate. The Kula? plate and its eastern spreading ridge were partially "captured" by the North American plate in the Paleocene. Between 63 Ma and 32 Ma, large volumes of volcanics erupted from its subducted N-S striking spreading ridge through a slab window. The eruptions stopped at 32 Ma, likely due to the Pacific plate fiat-slab subducting from the south beneath this spreading ridge. At 28 Ma, magmatism started again to the east; indicating a major shift to the east of this "refusing to die" spreading ridge. The captured Yakutat plate has also been subducting since 63 Ma to the WSW. It started to change to WSW fiat-slab subduction at 32 Ma, which stopped all subduction magmatism in W and SW Alaska by 22 Ma. The Yakutat plate subduction has again increased with the impact/joining of the coastal Yakutat terrane from the ESE about 5 Ma, resulting in the Cook Inlet Quaternary volcanism of southcentral Alaska. During the 1964 Alaska earthquake, sudden movements along the southcentral Alaska thrust faults between the Yakutat plate and the Pacific plate occurred. Specifically, the movements consisted of the Pacific plate moving NNW under the buried Yakutat plate and of the coastal Yakutat terrane, which is considered part of the Yakutat plate, thrusting WSW onto the Pacific plate. These were the two main sources of energy release for the E part of this earthquake. Only limited movement between the Yakutat plate and the North American plate occurred during this 1964 earthquake event. Buried paleopeat age dates indicate the thrust boundary between the Yakutat plate and North American plate will move in about 230 years, resulting in a more "continental" type megathrust earthquake for southcentral Alaska. There are, therefore, at least two different types ofmegathrust earthquakes occurring in southcentral Alaska: the more oceanic 1964 type and the more continental type. In addition, large "active" WSW oriented strike-slip faults are recognized in the Yakutat plate, called slice faults, which represent another earthquake hazard for the region. These slice faults also indicate important oil/gas and mineral resource locations. 展开更多
关键词 1964 Alaska earthquake oceanic and continental types of megathrust earthquakes WSW subducting Yakutat plate large active WSW striking slice faults Alaska geology and tectonics oil and gas resources.
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Abrupt uplift of Tibetan Plateau at the end of early Pleistocene and Australasian impact event 被引量:2
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作者 REN Shoumai LIU Yongjiang GE Xiaohong 《Global Geology》 2009年第3期145-155,共11页
The latest sharp uplift of the Tibetan Plateau and adjacent mountains occurred at the end of the early Pleistocene. The uplift of the Plateau resulted from Late Mesozoic--Cenozoic compressional structure due to the su... The latest sharp uplift of the Tibetan Plateau and adjacent mountains occurred at the end of the early Pleistocene. The uplift of the Plateau resulted from Late Mesozoic--Cenozoic compressional structure due to the subduction of the Indian Plate beneath the Asian continent. This event definitively effected the formation of basin-mountain relief, Cenozoic basin deformation, large scale aridity and desertification of western China. The Australasian meteorites impact event happened ca. 0.8 Ma ago, located in the triangle area of the Indian Ocean ridge (20°S/67°E). The impact may have resulted in an acceleration of speeding of the Indian Ocean ridge pushing the Indian Plate to subduct rapidly northward. Thus, the impact event can give reasonable explanation for the dynamic background of the latest rapid uplift of the Tibetan Plateau and the continental deformation of western China and even of the Middle Asia. 展开更多
关键词 abrupt uplift Tibetan Plateau early Pleistocene
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Features of Seismicity in the Northeastern China Region and Their Relation to the Subduction of the Japan Sea Plate
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作者 SunWenbin HeYueshi 《Earthquake Research in China》 2004年第4期373-384,共12页
Based on the analyses of grouped activity features of deep-focus (M≥6.0) and shallow-focus (M S≥5.0) earthquakes in the Northeast China region, the time-space correlation between deep focus “strong earthquake group... Based on the analyses of grouped activity features of deep-focus (M≥6.0) and shallow-focus (M S≥5.0) earthquakes in the Northeast China region, the time-space correlation between deep focus “strong earthquake group" and shallow focus “strong earthquake group" have been studied. The study was mainly on the characteristics of earthquake distribution on the collision zone between the west Pacific plate and the Eurasian plate and on its relations to the morphological feature of the western Pacific subduction zone. Moreover, emphasis was laid on analysis of the effect of the west Pacific plate on the seismicity of Eurasian plate. It is shown that in the region where the west Pacific plate subducts at low angles, the seismicity on the plate collision zone is strong, the effect of plate subduction on Eurasian continent is strong too, and the subduction zone is under a state of high compressional stress. However, in the region where the west Pacific plate subducts at high angles, the seismicity along the plate collision zone is weak, the effect of plate subduction on Eurasian continent is weak too, and the tensile stress produced by the subduction zone at depth is enhanced. We therefore propose that the seismicity in the northeast China region will enter an active period of shallow “strong earthquake group" in the future 10 years. In the period, six earthquakes of M S≥5.0 may occur. Therefore, the work of earthquake monitoring and prediction in this region shall be strengthened. 展开更多
关键词 Strong earthquake group West Pacific plate Earthquake trend Northeast China
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Industrial Agglomeration Externalities, City Size, and Regional Economic Development: Empirical Research Based on Dynamic Panel Data of 283 Cities and GMM Method 被引量:3
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作者 ZHU Huayou DAI Zejuan JIANG Ziran 《Chinese Geographical Science》 SCIE CSCD 2017年第3期456-470,共15页
Local governments have long been ardently pursuing the industrial specialization effect(MAR externalities) and industrial diversification effect(Jacobs externalities). Such a pursuit has resulted in severe distortion ... Local governments have long been ardently pursuing the industrial specialization effect(MAR externalities) and industrial diversification effect(Jacobs externalities). Such a pursuit has resulted in severe distortion of resource allocation and negative effect on sustainability of local economic development. Regarding the effect from both MAR and Jacobs externalities on local economic development existing literature records notable disputes. Therefore, for local economic development, one important issue is which externality(MAR or Jacobs) can better bring the effect into play. By studying a panel data of 283 Chinese cities from 2003 to 2012 and applying dynamic plane data GMM method, this paper conducted a regression analysis of the relationship among industrial agglomeration externalities, city size, and regional economic development. The result indicates that with regard to the whole nation, MAR externalities are conducive to regional economy development whereas Jacobs externalities will, to an extent, restrain regional economic development. As regards eastern, middle, and western regions, MAR externalities are conducive only to the economic development of the eastern region; their effects on middle and western regions are insignificant. Moreover, the interaction item between MAR externalities and city size has a significant negative synergistic effect on national economic development and a certain acceleration effect on eastern region as well as a strong negative synergistic effect on the middle region and an insignificant effect on the western region. The interaction item between Jacobs externalities and city size has a positive synergistic effect on only the middle region and has an insignificant synergistic effect on both eastern and western regions. Capital stock and labor input have significant accelerating effects on GDP growth per capita of Chinese cities, whereas material capital and labor input remain primary driving forces for Chinese local economic development. Furthermore, human capital contributes to accelerating urban economic development, whereas government intervention restrains urban economic development. 展开更多
关键词 MAR externalities Jacobs externalities city size regional economic development
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基于Dynaform的一种新型拉延模结构设计与应用 被引量:9
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作者 缑彦甫 王冲 张学文 《锻压技术》 CAS CSCD 北大核心 2016年第12期107-113,共7页
利用Dynaform板料成形有限元模拟分析软件,对某高端重型卡车中地板冲压设计工艺方案进行数值模拟分析,准确地预测出该产品较复杂部位的成形缺陷。为了消除中地板在冲压成形中的开裂、起皱、叠料等缺陷,根据成形CAE分析模拟结果,提出增... 利用Dynaform板料成形有限元模拟分析软件,对某高端重型卡车中地板冲压设计工艺方案进行数值模拟分析,准确地预测出该产品较复杂部位的成形缺陷。为了消除中地板在冲压成形中的开裂、起皱、叠料等缺陷,根据成形CAE分析模拟结果,提出增加不同方向和大小的凸筋的设计建议,并确定采用一种新型的"曰"字型压边圈的冲压工艺和模具结构设计方案,可以有效消除该产品的冲压成形缺陷。试模结果验证了冲压成形有限元分析的可行性,以及采用新型的冲压工艺可以降低模具开发成本,缩短模具调试周期,保证汽车中地板产品的成形质量。 展开更多
关键词 中地板 CAE分析 DYNAFORM 拉延模 分模线 冲压成形
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Mantle-derived magmas:intraplate,hot-spots and mid-ocean ridges 被引量:8
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作者 David H.Green Trevor J.Falloon 《Science Bulletin》 SCIE EI CAS CSCD 2015年第22期1873-1900,共28页
Primary or parental magmas act as probes to infer eruption and source temperatures for both mid-ocean ridge (MOR) and‘hot-spot' magmas (tholeiitic picrites). The experimental petrogenetic constraints ('inverse... Primary or parental magmas act as probes to infer eruption and source temperatures for both mid-ocean ridge (MOR) and‘hot-spot' magmas (tholeiitic picrites). The experimental petrogenetic constraints ('inverse' experiments) argue for no significant temperature differences between them. However, there are differences in major, minor and trace elements which characterise geochemical, not thermal, anomalies beneath ‘hot-spots'. We suggest that diapiric upwelling from interfaces (redox contrasts) between old subducted slab and normal MOR basalt source mantle is the major reason for the observed characteristics of island chain or ‘hot-spot' volcanism. Intraplate basalts also include widely distributed volcanic centres containing lherzolite xenoliths, i.e. mantle-derived magmas. Inverse experiments on olivine basalt, alkali oli- vine basalt, olivine basanite, olivine nephelinite, olivine melilitite and olivine leucitite (lamproite) determined liquidus phases as a function of pressure, initially under anhydrous and CO2-absent conditions. Under C- and H-absent conditions, only tholeiites to alkali olivine basalts had O1 + Opx 4-Cpx as high-pressure liquidus phases. Addition of H20 accessed olivine basanites at 2.5-3 GPa, ,- 1,200 ℃, but both CO2 and H20 were necessary to obtain saturation with O1, Opx, Cpx and Ga at 2.5-3.5 GPa for olivine nephelinite and olivine melilitite. The forward and inverse experimental studies are combined to formulate a petrogenetic grid for intraplate, ‘hot-spot' and MOR magmatism within the plate tectonics paradigm. The asthenosphere is geochemically zoned by slow upward migration of incipient melt. The solidus and phasestabilities of lherzolite with very small water contents (〈3,000 ppm) determine the thin plate behaviour of the oceanic lithosphere and thus the Earth's convection in the form of plate tectonics. There is no evidence from the parental magmas of MOR and ‘hot-spots' to support the 'deep mantle thermal plume' hypothesis. The preferred alternative is the presence of old subducted slabs, relatively buoyant and oxidised with respect to MORB source mantle and suspended or upwelling in or below the lower asthenosphere (and thus detached from overlying plate movement). 展开更多
关键词 experimentsMantle-derived magmas ·High-pressureC-H-O · Asthenosphere - Hot-spotsPlate tectonics
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Destruction of North China Craton:Insights from temporal and spatial evolution of the proto-basins and magmatism 被引量:13
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作者 LI HongYan 《Science China Earth Sciences》 SCIE EI CAS 2013年第3期464-478,共15页
Temporal and spatial evolution of proto-basins and magmatism in the North China Craton might provide information of its destruction.Overall,the destruction of the North China Craton is a heterogeneous process of botto... Temporal and spatial evolution of proto-basins and magmatism in the North China Craton might provide information of its destruction.Overall,the destruction of the North China Craton is a heterogeneous process of bottom upward and from margin toward interior,related to multiple interactions between the craton and its surrounding plates.The interior of craton would be initially destructed during the Early-Middle Jurassic.Subduction of the Paleo-Asian Ocean Plate may have destructed the northern margin of the North China Craton.Collision of the Yangtze Plate with the North China Craton is significant for the magmatic and tectonic activities during the Late Triassic-Middle Jurassic.Subductions of the Izanagi and Paleo-Pacific plates lead to the ultimate destruction of the North China Craton.Temporal and spatial evolution of the proto-basins and related magmatism in the North China Craton indicate that the dominant mechanism of the cratonic destruction may be thermal mechanical-chemical erosion. 展开更多
关键词 North China Craton MESOZOIC superficial geology proto-basin temporal and spatial evolution
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Thinning and destruction of the cratonic lithosphere:A global perspective 被引量:45
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作者 WU FuYuan XU YiGang +1 位作者 ZHU RiXiang ZHANG GuoWei 《Science China Earth Sciences》 SCIE EI CAS 2014年第12期2878-2890,共13页
It has been proposed that the North China Craton(NCC)was thinned up to a thickness of>100 km during the Phanerozoic,and underwent an associated craton destruction.Evidently,it is an important topic worthy of future... It has been proposed that the North China Craton(NCC)was thinned up to a thickness of>100 km during the Phanerozoic,and underwent an associated craton destruction.Evidently,it is an important topic worthy of future study to understanding the mechanism of cratonic destruction and its role played in the continental evolution.After synthesized the global cratons of India,Brazil,South Africa,Siberia,East Europe(Baltic)and North America,we found that lithospheric thinning is common in the cratonic evolution,but it is not always associated with craton destruction.Most cratons was thinned by thermal erosion of mantle plume or mantle upwelling,which,however,may not cause craton destruction.Based on the studies of the North American and North China Cratons,we suggest that oceanic subduction plays an important role in caton destruction.Fluids or melts released by dehydration of the subducted slabs metasomatize the mantle wedge above and trigger extensive partial melting.More importantly,the metasomatized mantle lost its original rigidity and make craton easier to be deformed and then to be destoyed.Therefore,we suggest that the widespread crust-derived granite and large-scale ductile deformation within the continental crust can be regarded as the petrological and structural indicators of craton destruction,respectively. 展开更多
关键词 lithospheric thinning DESTRUCTION mantle plume SUBDUCTION CRATON
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