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主要叙述了目前世界上最大的165MN油压机中上横梁的铸造和生产。通过铸件结构分析,在造型方法、型砂、工艺参数、凝固过程和浇注过程的控制,一次浇注成功铸件重量453t,总钢水622t的上横梁,达到国际先进水平。 相似文献
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抚顺机修厂自制一台一千吨油压机。油压机的横梁是由净重4t左右的铸钢件制成,由于受到铸造条件的限制,只得将横梁由中间分成两个部分进行浇铸,然后拼焊在一起,如图1所示。由图可见,横梁拼焊最适合的方法是电渣焊。根据工厂条件,采用了熔嘴电渣焊。由两 相似文献
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快锻油压机是能源、军工和交通等重大装备制造的关键设备。本文以ABAQUS有限元分析软件为平台,对25MN快锻油压机上横梁、活动横梁和固定梁进行了有限元静力学分析,得出了这些关键部件在最大载荷下的应力分布和位移分布,其结果对快锻油压机的结构设计和优化具有一定的指导意义。 相似文献
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国外电力机车电机壳结构复杂,内部质量要求高,铸造难度较大。通过研究和改善铸造工艺,解决了铸件补缩困难、表面裂纹较多、铸件变形较严重等工艺难点,保证了产品的成功开发。 相似文献
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一种油压机,包括机身、支撑架、油压缸、横梁、机台、上模具和下模具;支撑架与机身的上部固定连接,油压缸固定在支撑架上,横梁与油压缸的活塞轴连接,上模具和下模具分别固定在横梁和机台上。还包括导杆和滑块;导杆平行设在支撑架内左右侧并与支撑架和机身固定连接;滑块设在横梁的两端,其中间设有一与导杆相配合的通孔;支撑架为框门式支撑架。这样的油压机外形美观、稳定性好、噪音小且不易磨损,延长了油压机的寿命。 相似文献
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扫描电镜观察显示胫骨是一种由羟基磷灰石和胶原蛋白组成的自然生物陶瓷复合材料.羟基磷灰石具有层状的微结构并且平行于骨的表面排列.观察也显示这些羟基磷灰石层又是由许多羟基磷灰石片所组成,这些羟基磷灰石片具有长而薄的形状,也以平行的方式整齐排列.基于在胫骨中观察到的羟基磷灰石片的微结构特征,通过微结构模型分析及实验,研究了羟基磷灰石片平行排列微结构的最大拔出能.结果表明,羟基磷灰石片长而薄的形状以及平行排列方式增加了其最大拔出能,进而提高了骨的断裂韧性. 相似文献
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论述了CAD技术中参数化设计的三种建模方法,重点介绍了基于特征的参数化建模原理。在此基础上,分析机械设计中的机构结构,归纳出其零件的几何特征构成。设计了机构CAD图形库,并提出了该图形库生成步骤和人机交互界面。 相似文献
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采用激光辐照对FeCrAlW电弧喷涂层的组织进行致密化处理,借助扫描电镜和X衍射对涂层的组织进行了分析.测试了涂层的显微硬度.结果表明:涂层组织致密度提高,孔隙率明显降低.随着激光扫描速度的增加,涂层的显微硬度降低.在较低的扫描速度下,涂层与基体之间形成互熔区,涂层与基体之间产生良好的冶金结合. 相似文献
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C. Colinet 《Intermetallics》2003,11(11-12):1095
A large number of ab-initio calculations of energies of formation of intermetallic compounds have been performed in the last 15 years. The currently used methods are listed. The paper presents a review of the aluminium based compounds which have been studied. Comparisons of calculated and experimental enthalpies of formation are provided for aluminim-3d and-4d transition metal alloys at equiatomic composition. The modelling of the enthalpies of mixing of solid solutions based on a given lattice is described. 相似文献
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O. N. Vlasova N. N. Korneeva V. I. Eremenko O. Kh. Fatkullin N. M. Semenova S. N. Petrova D. D. Vaulin 《Metal Science and Heat Treatment》1991,33(12):924-931
Conclusions To provide a high level of mechanical properties in wrought blanks of cast ÉP741NP and ÉP962 alloys it is necessary to form controlled structures. A necklace-type structure formed in homogenizing isostatic treatment, subsequent thermomechanical working including alternation of the operations of deformation in the (+)-area and recrystallization anneals, and final heat treatment is preferable. The temperature conditions of all stages of thermomechanical working are strictly controlled, especially the final operation of deformation and heating for hardening. To eliminate hardening cracks and distortions it is necessary to use molten salts at t=600°C as quenchants. The use of multiple production operations makes it possible to significantly reduce the structural inhomogeneity related to inhertance of the original dendritic structure. However, the structure of the final semifinished product is nevertheless characterized by a difference in occurrence of the processes of polygonization and recrystallization between the former dendritic cells and the interdendritic spaces in deformation and heat treatment.To obtain structurally homogeneous blanks for gas turbine engine parts it is necessary to use basically new methods of remelting such as vacuum double electrode remelting and electron beam remelting with an intermediate vessel.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 25–29, December, 1991. 相似文献