卡爪式水下连接器承载能力分析

针对卡爪式水下连接器工作环境十分恶劣、外界干扰因素较多、会受到拉、压、弯、扭等外力的作用的问题,建立了连接器的模型,对各种受力状态进行了分析,提出了连接器在各种状态下的最大承载能力的计算方法。连接器对拉力的承载能力通过确定卡爪的危险截面及伸长量进行分析;连接器对压力的承载能力取决于两法兰之间的预留距离,通过计算卡爪的最大压缩量进行分析;连接器对弯矩的承载能力以距法兰中线最远的卡爪受力为准,根据倾覆力矩对连接器进行弯矩分析;连接器对扭矩的承载能力是由连接器内部卡爪与法兰之间的摩擦力决定的,在不同工况下,根据卡爪对法兰的正压力的变化,可以得到不同的结果。通过对卡爪式连接器的受力状态分析得到的连接器承载能力,对于国内类似水下机械式连接器的发展有一个很好的借鉴作用。     

水下执行器液压控制仿真

介绍了当前国内外在水下油气开发方面的状况.并阐述水下生产系统的结构和原理.并对水下生产设施液压控制系统的执行器进行研究,然后对其在工作过程中压力的变化通过AMESim软件进行了仿真.仿真曲线清楚显示了执行器在工作过程中压力的变化规律.为研究、设计和开发水下生产系统提供了参考.     

铝电解机械旋转搅拌式蘸石墨机研发与应用

对原喷吹式蘸石墨机在生产过程中存在问题进行总结分析,结合生产工艺研究开发了机械旋转搅拌式蘸石墨机,解决了原喷吹式蘸石墨机煤油石墨混合液不能均匀涂在钢爪表面的问题,降低了铁炭压降、提高了钢爪与磷铁环分离效率。     

水下生产配套装置线性覆盖工具液压系统设计与仿真

为了解决水下生产配套装置线性覆盖工具输出的液压推力过小不能完全打开水下采油树阀门的问题,根据水下生产配套装置线性覆盖工具的运动特点,设计一套液压系统。通过Simulink/SimHydraulics模块构建线性覆盖工具中主活塞缸液压系统仿真模型,并对该系统进行仿真研究。仿真结果表明:线性覆盖工具主活塞缸在打开水下采油树阀门的工作状态下活塞杆运动平稳、无杆腔压力稳定,能够完全打开采油树阀门。通过与现场试验结果对比分析,该液压系统的各项仿真数据与实验结果基本吻合,证明了该液压系统具有合理性与可行性,同时也说明了该液压系统符合设计要求。     

海洋水下液压连接器设计与应用

根据国内首套自主开发的水下应急封井装置的实际需求,设计一种全新的液压连接器,具备机械加双重液压驱动解锁的三重解锁机构,具有HC型和H4型液压连接器快速转换锁紧机构,具有一次和二次的冗余密封结构设计,在连接器顶部和下部设计有水合物抑制结构等,适应3 000 m以上深水工况。该连接器具有重要的经济和社会效益,可为国内水下液压连接器研制开发提供参考。     

螺纹卡爪结构件注射模设计

介绍了螺纹卡爪式结构件注射模设计、模具工作过程和卡爪脱模结构在注射模中的应用.模架类型选用简化型三板模,针对该塑件头部卡爪倒扣的结构特点,充分利用塑胶材料韧性良好的特性,采用多次分型的结构来对卡爪倒扣进行强脱,动模滑块对半的侧抽芯开模方式,最后由顶杆板推出塑件,机械手抓取塑件来实现自动生产.     

电连接器压线卡断裂分析

电连接器产品组装交付用户并贮存半年后,发现H62黄铜压线卡发生断裂。通过对压线卡宏观观察、微观观察、能谱分析、硬度检查、金相检查,以及同批次压线卡的人工断口、硬度以及金相组织的对比分析,确定此次电连接器压线卡的断裂模式为应力腐蚀。断裂原因主要有两方面:一是压线卡内热缩膜体积较大导致压线卡承受较大拉应力;二是压线卡镀层表面发生破坏失去了保护基体材料的作用,在这两个方面因素的综合作用下最终导致压线卡发生应力腐蚀断裂。建议进一步对压线卡内热缩膜的体积进行量化控制,同时对电连接器压线卡表面镀层的生产、贮存、使用等过程进行控制,避免对镀层的损伤破坏。     

45钢卡爪带状组织的形成及消除办法

我厂生产的Ｋ11系列卡盘上的卡爪 ,用 45钢制造 ,其加工流程为 :锻造→正火→机加工→整体淬火、回火→高频淬火、回火→精加工。生产过程中发现有一批Ｋ1110 0卡爪 ,见图 1,在整体淬火、回火后 ,表面硬度为 48～ 5 4ＨＲＣ ,硬度偏低且硬度分布不匀 (本厂要求表面硬度为 5 3～ 5 8ＨＲＣ)。卡爪的整体淬火工艺为 :盐浴加热 ,790℃保温 5ｍｉｎ后盐水冷却。由于卡爪形状复杂 ,为避免和减小卡爪的淬火开裂及变形 ,采用较低温度淬火 ,然后在 180℃回火 90ｍｉｎ。对表面硬度不合格的卡爪进行金相组织及成分检验 ,结果表明 ,卡爪表面无脱碳层 ,…     

水下长脐带缆液压管的等效模拟方法研究

根据当前水下生产系统的研究需要,提出针对水下长脐带缆液压管的等效模拟方法,研究相关理论基础,并推导相应模拟元件的数学模型。基于工程系统仿真软件AMESim,依托我国南海某水下油气田的环境参数及部分工况,建立长脐带缆液压管的长管模型及其等效模拟系统模型,并进行仿真试验。通过对模型响应时间、压力、流量等动态特性的分析及现场应用试验,验证了该等效模拟方法的相关理论方案、数学模型及研究方法的正确性和可行性。该等效模拟方法可以用于水下液压系统物理测试台中长脐带管等效模拟系统的设计。     

基于AMESim水下液压控制系统仿真分析

复合电液控制是目前深水油气田开发应用较多的控制方式。对水下液压控制系统进行分析,对主要的液压参数如操作压力,HPU蓄能器、水下蓄能器容积进行计算;依据南海某油气田工程实际,应用AMESim建立水下电液复合控制系统充压仿真模型,仿真模拟不同脐带缆管径对系统充压和ESD的影响,并利用AMESim仿真软件对南海某油田液压控制系统典型工况进行建模和动态仿真。仿真结果表明,该液压系统的各项性能指标均满足相应标准规范和工程的要求。该仿真研究为脐带缆管径选择提供参考,对水下液压控制系统的关键元部件选择分析有很好的参考和指导作用。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

正~~