共查询到18条相似文献,搜索用时 125 毫秒
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从降低能耗、减少环境污染以及节约有限资源的社会需求出发,阐述了汽车涡轮增压器技术在汽车工业发展中的迫切需求及巨大的市场潜力,指出了涡轮增压器涡壳在铸造生产过程中所面临的技术难题与挑战. 相似文献
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介绍了应用CAD\CAE技术设计涡轮增压器壳体快速铸造工艺的过程。使用Pro/E软件对铸件与浇注系统建立模型,应用ProCAST软件对快速铸造过程进行模拟,选择合理浇注方案,并使用正交试验法确定最佳工艺参数。结果表明:顶注三点式浇注方案为合理设计方案。在浇注温度1400℃、型壳温度1050℃条件下进行试浇验证,得到铸件无缩孔缩松缺陷,质量良好。 相似文献
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《特种铸造及有色合金》2016,(1)
采用UG软件对低压铸造增压器壳体铸造模具进行三维造型,同时对模型进行简化。用Hypermesh软件对模型进行网格划分以获得高质量的网格,运用Abaqus软件模拟增压器壳体的铸造成形过程,对壳体模具在铸造过程中的变形进行分析,预测飞边产生的位置及大小,并与实际生产中产生的飞边作对比;采集模拟的分型面间隙数据,将间隙量补偿在模具上,对模具进行修正补偿,并进行铸造试验,铸件没有飞边,得到与预期相符的结果。 相似文献
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高镍奥氏体球墨铸铁涡轮增压器壳体材质及工艺研究 总被引:1,自引:0,他引:1
对高镍球铁涡轮增压器壳铸件的开发和研究进行了系统总结,包括高镍奥氏体球铁材质成分和铸件工艺设计,球化剂、孕育剂的选择和制备,高镍球铁涡壳铸件表面气孔缺陷和缩孔缩松缺陷的消除,高镍奥氏体球铁铸造性能的测试以及高镍球铁涡轮增压器壳铸件理化检测问题. 相似文献
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涡轮的结构特性是壳体壁厚与叶片壁厚相差悬殊,叶片不仅数量多壁厚薄,而且与半圆形的圆环连接成一体,因此涡轮的铸造难度大.在涡轮试生产的过程中,通过强化工艺细节的控制,在非真空熔炼、非真空浇注的条件下,生产的铸件品质满足了客户的要求. 相似文献
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介绍了所用升降式盖包的漏铁孔尺寸设计原则和使用注意事项和盖包球化工艺在SiMo球铁涡壳铸件和高Ni球铁涡壳生产中的应用情况。实际生产数据表明:盖包球化处理工艺可以降低球化处理温度和减少球化处理过程的温降,提高球化稳定性和铸件质量,降低生产成本。 相似文献
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Seal and blade-tip rubbing in turbo machinery can often result in costly rotor damage. Acoustic emission analysis at the bearings has previously been cited as a viable non-destructive monitoring technique by which the onset of such rotor–stator contacts can be detected in large-scale turbines [Aerospace Conf., IEEE Proc. 6 (2000) 79; Electr. Engng Jpn 110 (2000)]. These studies suggested that the stress waves or acoustic emissions produced during the frictional rub process can propagate across the turbine surface and across the bearing interfaces to be detectable by the sensor attached to the bearing housing. However, results from the actual large-scale turbine units have been scarce.
This paper presents a fundamental/pre-requisite study on the transmissibility of acoustic emission (AE) signatures across very large-scale turbine rotors. It is concluded that the actual AE attenuation incurred does not inherently exclude the detection of seal and blade rubbing in turbines. However, its success is highly dependent on advanced signal processing. 相似文献
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This paper expatiates on domestic status of heavy steel casting production, with a special focus on hydraulic turbine castings for Three Gorges Project. In China, there is magnificent demand for heavy castings with the rapid growth of the national economy in recent years and the expected high growth in the coming 10 to 20 years. Some heavy and large castings such as mill housing and hydraulic turbine runner crown, blade and band for Three Gorges Project have been successfully made. However, the domestic production capability is still far from meeting the gigantic requirements. The domestic capability still lags behind the world class level, and a lot of heavy castings still depend on import. The paper also gives a particular introduction of the key technologies in the manufacturing of heavy steel castings like metal melting, foundry technology, heat treatment technology and numerical simulation technique, etc. In addition, several case studies on the application of numerical simulation in the production of heavy steel castings are presented. 相似文献
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目的 探究重型燃机喷嘴壳体及遮热板热障涂层剥落机制,为该部件的全寿命管理提供参考。方法 采用等离子喷涂方法,分别制备以06Cr25Ni20不锈钢和Hastelloy X合金为基材的热障涂层试验件,并结合水淬热冲击表征方法与瞬态热力耦合仿真方法,表征热障涂层水淬后的剥落状态,获得热障涂层残余剪应力的分布状态随基材和服役工况的变化行为,揭示热障涂层在多层热失配工况下的剥落机制。结果 在水淬热冲击条件下,2种不同基材的热障涂层试验件表现出类似的剥落行为,但由于基材热膨胀系数的差异,以06Cr25Ni20不锈钢为基材的热障涂层的残余剪应力(70.1 MPa)比Hastelloy X合金基材的热障涂层(52.7 MPa)更大,热冲击寿命更短。在梯度温度载荷下,2种不同基材热障涂层试验件的失效模式不同,前者的最大残余剪应力为39.2 MPa,后者为25.7 MPa。结论 在2种温度载荷下,以Hastelloy X合金为基材的热障涂层具有较低的残余应力和较长的服役寿命。此外,水淬热冲击可以快速表征热障涂层的寿命行为,但其失效模式与实际梯度温度载荷下的失效模式仍有一定区别。 相似文献
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William T. CarterJr. Robin M. Forbes Jones 《JOM Journal of the Minerals, Metals and Materials Society》2005,57(4):52-57
The gas turbine industry is continuously driven to achieve higher thermodynamic efficiency, higher electrical output, and
higher reliability through turbine design improvements. The specific component of interest in this article is the turbine
wheel, which is the rotating hub on which turbine blades are mounted. The wheel is mechanically loaded by both axial and centrifugal
forces and thermally loaded by heat that is conducted from the turbine blades. Currently, the turbine wheel is forged from
an ingot that is triple-melted, but nucleated casting is under development as a long-term option. This article describes the
investigation into nucleated casting technology for future turbine wheel production.
For more information, contact William T. Carter, Jr., General Electric Global Research Center, One Research Circle K1-279MB,
Niskayuna, New York 12309, USA; (518) 387-6452; fax (518) 387-5576; e-mail carter@crd.ge.com. 相似文献
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硬岩隧道掘进机(TBM)通过刀盘上的滚刀破碎剥离岩石开挖,刀座系统是连接滚刀与刀盘之间的桥梁,其联接可靠性和承载能力性能好坏直接关系到设备开挖效率及施工维护成本,刀座系统设计理论及标准的缺乏已无法满足TBM安全、高效发展需求。总结刀座系统的结构设计基本原则,基于系统受载特性分析及轴式滚刀基本结构尺寸,建立了分体式刀座和整体式刀座的结构参数化设计方法。通过对轴式滚刀-刀座系统进行静力学建模,分析额定负载工况、不同螺栓预紧力下、不同工作载荷下的静力学特性,找出了各类刀座的应力分布特性、危险区域,揭示了工程中刀座部分区域开裂、压溃现象的力学原因。此研究可为工程中刀座优化设计提供参考。 相似文献
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为了得到某微型轴流涡轮的气动性能和优化设计方案,利用计算流体动力学(CFD)软件CFX14.0对涡轮的流场进行了全三维计算,湍流模型采用带转捩SST(Shear Stress Transport)的N-S(Navier-Stokes)方程模型,计算结果与试验结果进行了对比,两者吻和较好。计算得出了涡轮在各个工作点的内部流动状况并得到涡轮的特性曲线,该发动机燃气涡轮性能平坦,工作范围较窄,设计点效率为0.805,相对大型发动机的涡轮效率较低。计算结果为先进的微型航空发动机的涡轮设计提供了一定的参考和借鉴。 相似文献