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非常动漫



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[b]爱国T恤"我爱中国,支持奥运"30元/件爱国价出售!

爱国T恤"我爱中国,支持奥运"30元/件爱国价出售!


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顶端 Posted: 2008-04-20 23:51 | [楼 主]
非常动漫



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顶端 Posted: 2008-04-26 02:13 | 1 楼
bbfjureoi

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我觉得挺好的

我觉得挺好的,大家的看法呢

-------------------------
Lord of the Rings online Gold web links:lotro gold,lotr gold,Lord of the Rings online Gold,SRO Gold,SilkRoad Online Gold,
过客
顶端 Posted: 2008-05-06 12:16 | 2 楼
efgh338

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铝合金车轮挤压铸造工艺

高空作业车轮是一个重要零件。过去,国外采用压力铸造生产该铸件,铸件质量差,且成品率低,劳动强度大。针对该铸件的结构特点和性能要求,如何提高其产品质量、降低原材料消耗、节约能源、提高劳动生产率及降低铸件成本,是当前生产中的关键。从研制的情况可知,采用挤压铸造代替压力铸造是今后制造铝合金车轮行之有效的工艺。
  1 高空作业车车轮材料、要求及铸件设计
  图1所示为铝合金车轮零件图。车轮不仅有较高的性能要求,而且形状十分复杂。
图1 车轮零件图
  车轮材料的化学成分(质量分数)为:1.5%~3.5%的Cu,10.5%~12.0%的Si,<0.3%的Mg,<1.0%的Zn,<0.5%的Mn,<1.3%的Fe,<0.5%的Ni,<0.5%的Sn,其余为Al。力学性能要求:σb>276 MPa,σs>115 MPa,σ>4.4%,HB>92。
  该高空作业车车轮内外形的尺寸精度较高,都应加放加工余量及余块。按挤压铸造工艺的要求,把形状复杂的车轮零件图设计如图2所示的铸件图。
  由该图可见,为便于从铸件内孔脱出及简化模具加工,把原来的阶梯轴孔设计成圆柱形中心孔,其直径为φ30 mm,内壁斜度为3°[1]。
图2 车轮铸件图
  2 模具结构及设计参数[1]
2.1 挤压铸造模具结构
  高空作业车车轮挤压铸造的模具结构如图3所示。它主要有凸模、右凹模、顶杆镶块和左凹模组成所要求的型腔。左凹模和右凹模分别固定在左凹模定模板和右凹模动模板上,左凹模定模板用螺钉紧固在下模板上,右凹模动模板经过侧缸在导柱上实施开启及闭合。
图3 车轮挤压铸造模具
  1.上模板 2.凸模固定板 3.凸 模 4.导 柱 5.右凹模 6.右凹模动模板
  7.垫 板 8.下模板 9.顶杆镶块 10.左凹模 11.左凹模定模板
  采用2000 kN油压机改装进行挤压铸造,高空作业车工作过程是:将定量的合金熔液浇入型槽后,固定在活动横梁上的凸模以一定速度向下挤入型腔,压力达一定数值后保压;铝合金凝固后卸压,凸模通过工作缸的回程向上移动,顶杆镶块通过下顶缸从铸件内向下退出,直到全部脱离铸件之后,再用侧缸开启右凹模,取出铸件。
  2.2 高空作业车模具设计的主要参数
  (1) 间隙 凸模与左、右凹模之间的间隙要适当。高空作业车过小则因凸模与凹模的装配误差而相碰或咬住;过大则合金熔液通过间隙喷出,造成事故;或者在间隙中产生纵向毛剌,减小加压效果,阻碍卸料。合理的间隙与加压开始时间、加压速度、压力大小、工件尺寸及金属材料有关。根据实际生产经验,单边间隙取0.1 mm。
  (2) 脱模斜度 合金熔液在凸模压力下凝固成铸件,冷却后紧包在凸模及顶杆镶块上。为了便于凸模及顶杆镶块脱出,故在凸模及顶杆镶块上设有3°的脱模斜度。由于铸件外形呈圆状,且分在左、右两片凹模,只要右凹模向右移动一定距离,铸件就易从左凹模取出,故不必设置脱模斜度。
  (3) 排气 在左、右两片凹模完全闭合后,合金熔液因缓慢地浇入型腔,高空作业车型腔中气体可基本排出。挤压铸造时,留在凸模导向部分的少量气体,通过凸模与凹模之间的间隙排出。
  (4) 模具材料 挤压铸造是在一定的压力和一定的温度下进行的,高空作业车不存在像压铸模那样受到金属液的冲刷。工作压力比压铸时高,只要求模具在高温下有一定的抗压强度即可。另外,为了防止与合金熔液接触的模具表面产生热疲劳裂纹,左右凹模、凸模及顶杆镶块均采用3Cr2W8V合金模具钢制造,热处理后硬度为HRC48~52,型腔表面进行软氮化处理。
  3 挤压铸造的工艺参数
  高空作业车挤压铸造是铸锻结合的工艺,其生产工艺过程是:合金的熔化、模具的准备(清理、预热、喷涂润滑剂)、金属的浇注、液态金属的加压、压力的保持、压力的去除及铸件的取出等。
顶端 Posted: 2008-06-28 07:24 | 3 楼
宏芳瑜



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age of conan gold and the order

age of conan gold and the order
    from:wow gold
Yes, it’s time again for another edition of undocumented Age of Conan patch notes. We briefly mentioned them in the invisible hotfix edition that took place shortly after the latest Age of Conan patch. The list maintained on the official Age of Conan forums has grown since then. We know some of our reader’s favorite Age of Conan moments were canceling their accounts (very funny guys) but not everyone is a quitter, and this time around there are a lot more fixes reported.
    There are two forum www.ageofconan.com threads that players maintaining the undocumented changes from the latest patch. One on the US player forums and a bug thread on the EU player forums. We took a little heat last time we reported on the last undocumented changes so please keep in mind that Massively can not confirm or deny the submissions reported in the undocumented patch note threads. The reports and feedback presented are done by the Age of Conan playerbase and their intentions are their own. The full list from the US player forums continues after the cut.the orderage of conan gold
    Developed by Funcom , creators of the science fiction MMORPG Anarchy Online and the critically-acclaimed adventure game,Age of Canon:Hyborian Adventure,is one of the most expectant games in Occident,and it also enjoys high reputation in other countries,whiich is a new "online action roleplaying game" based on the Conan the Barbarian series of fantasy pulp novels written by Robert E. Howard. Custom-made saddle listed in the patch notes did not make it in. 1 Update: Saddle in game GUI www.ageofconan.com
    Right clicking to someone’s name on chat will result in 5-6 duplicate system spam, including the info about that person. 1 Mouse autowalk with mounts doesn’t enable other controls.
Castbar does not show after selecting a player after aoc gold cast intiation.You now receive a on-screen message when Shield of Risen fades. Some font color issues with custom UIs and spells/tradeskills tips. Guild tags have reduced font size. Double-name tag above some players? (NPCS Sometimes have player name tags) 1 Target’s Target not part of new floating UI interface.
    The cliff-hanging scenarios are stated as follows:In a world filled with cruel gods, mythical creatures, lost civilizations and a struggling human race, the mighty barbarian has finally seized the throne as king of Aquilonia.aoc gold 1 Axes doing sword fatalities instead of their own. Classes and Combat the order
    Stats on blue set items being changed, www.ageofconan.com in addition to graphics. attack speed 2.0 on 1H weapons. Funcom Responds 1 2 Some armorsmith recipes require a lot more materials.
General Technical Issues
    The cliff-hanging scenarios are stated as follows:In a world filled with cruel gods, mythical creatures, lost civilizations and a struggling human race, the mighty barbarian has finally seized the throne as king of Aquilonia.
but for the next community competition, Funcom would like to focus on the good times. age of conan gold Over the next week, players can describe their best AoC moment for a chance to win themselves a
    answers must be more than 5 lines age of conan gold in length. Secondly, you cannot describe an exploit, so even if your very best moment was when you exploited the heck out of the game
    you’ll need to think of your second best memory for the purpose of this competition.www.ageofconan.com Entries close at 1AM EDT on Friday the 25th of July, and five winners will be chosen after that time.
顶端 Posted: 2008-08-15 02:22 | 4 楼
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