共查询到19条相似文献,搜索用时 765 毫秒
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介绍了加工油管螺纹的一种新的工艺线的布置方式,工艺试验表明,带接箍油管另一端加工螺纹时,其接箍对螺纹质量基本无影响,其检验项目锥度、螺距、齿高、紧密距、L1长度在均在公差允许范围内。油管带接箍后另一端螺纹的工艺方案可行。 相似文献
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石油天然气钻采用油管的工作状态极为复杂,因而对其质量要求较高。油管接箍通过螺纹将油管连接,故对接箍外形尺寸、联接强度、密封性、综合力学性能及耐腐蚀性能等都有严格要求。对于油管接箍用无缝钢管的要求也不例外。介绍常州宝钢钢管有限公司在引进的Φ102mmCPE顶管机组上开发热轧J55钢级油管接箍用管的过程,油管接箍用管的生产工艺流程,工艺参数,试制工艺难点及改进措施。 相似文献
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介绍了“圆螺纹连接不粘扣接箍”、“油田用高连接强度圆螺纹套管(HS-RTC)”、“高气密偏梯形螺纹套管(HT-BTC)”等技术和专利。圆螺纹连接不粘扣接箍专利是通过增大接箍螺纹起始牙的节径,采用一小段“引入螺纹”作过渡的接箍来消除粘扣现象的;HS-RTC专利是利用圆螺纹套管的黑皮螺纹参加连接来提高连接强度的;HT-BTC技术是将API偏梯形螺纹套管(BTC)的管端加工成圆弧形的轴向过盈金属密封面,缩短接箍长度,使接箍连接的两支套管的端面在油田紧扣后紧密封时,相互接触压紧,形成封闭的金属密封环,由此来提高密封性能。 相似文献
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针对废旧油管和接箍锻件的特点和成形工艺分析,设计出利用废旧油管制备接箍件的模锻成形工艺和模具。模块化组合式的模具结构设计、矩形沟槽式夹紧镶块结构、芯轴的倒锥设计及对其前端的球面化处理,大大提高了模具的更换和维修效率,同时降低了模具的使用成本,有效解决了模锻过程中坯料的装夹定位稳定性问题,且提高了成形过程的变形均匀性和开闭模具的稳定性。通过对接箍件成形的有限元数值模拟,验证了模锻成形工艺及模具设计的合理性与可行性。采用废旧油管通过模锻成形工艺制备接箍件,为采油行业大量废弃的油管提供了一条高附加值利用的有效途径。 相似文献
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通过引入有限变形回弹反耦联系统和反耦联方程的概念,由回弹势能原理建立了板成形的大挠度回弹有限元法。并应用此方法对板的成形回弹进行模拟计算,将计算结果与实验结果进行了比较。 相似文献
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《Acta Materialia》2001,49(9):1599-1605
This paper presents models to describe the dislocation dynamics of strain relaxation in an epitaxial uniform layer, epitaxial multilayers and graded composition buffers. A set of new evolution equations for nucleation rate and annihilation rate of threading dislocations is developed. The dislocation interactions are incorporated into the kinetics process by introducing a resistance term, which depends only on plastic strain. Both threading dislocation nucleation and threading dislocation annihilation are characterized. The new evolution equations combined with other evolution equations for the plastic strain rate, the mean velocity and the dislocation density rate of the threading dislocations are tested on GexSi1−x/Si(100) heterostructures, including epitaxial multilayers and graded composition buffers. It is shown that the evolution equations successfully predict a wide range of experimental results of strain relaxation and threading dislocation evolution in the materials system. Meanwhile, the simulation results clearly signify that the threading dislocation annihilation plays a vital role in the reduction of threading dislocation density. 相似文献
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This paper presents the mechanics and dynamics of thread milling operations. The tool follows a helical path around the wall of the pre-machined hole in thread milling, which has varying tool-part engagement and cut area during one threading cycle. The variation of cut area that reflects the kinematics of threading as well as structural vibrations is modeled along the helical, threading path. The mechanics of the process are first experimentally proven, followed by the formulation of dynamic thread milling which is periodic in threading cycle, in a semi-discrete time domain. The stability of the operation is predicted as a function of spindle speed, axial depth of cut, cutter path and tool geometry. The mechanics and stability models are experimentally proven in opening M16×2 threads with a five-fluted helical tool on a Steel AISI1045 workpiece. 相似文献
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国内油田修井作业存在人工辅助管柱的起、下操作的危险性以及人工效率低下的问题。研制一种修井作业移运油管机械手,并提出一种新型末端夹持器机构模型,以解决机械手抓取油管的难题。根据D-H参数法创建机械手运动学模型,对机械手进行正逆运动学分析;结合移运油管的工况需求,确定移运过程的轨迹以及经过的目标关键点;使用MATLAB和五次多项式插值法,根据目标关键点进行轨迹仿真,验证机械手轨迹规划的合理性,为机械手的运动控制和轨迹优化提供参考。 相似文献