KCM130型可控冲击矛拨转轴断裂原因分析与优化设计  

Causes Analysis for Poker Spindle Fracture of Model KCM130 Controllable Impact Spear and Its Optimal Design

作　　者：刘建林[1] 殷琨[1] 郑俊华[1] 王文龙[2] 

机构地区：[1]长春吉林大学朝阳校区建设工程学院,2006级博士130026 [2]中原油田钻井工程技术研究院

出　　处：《工程机械》2007年第12期42-46,共5页Construction Machinery and Equipment

摘　　要：拨转轴是KCM130型可控冲击矛矛头控向机构中的关键零件。在样机室外试验过程中曾出现因拨转轴断裂而导致矛头控向机构失效的情况。针对拨转轴断裂失效问题,分析了矛头处于两种不同工作姿态时拨转轴的受力状态,确定施工曲线轨迹钻孔时拨转轴的承载状态为其危险工况。运用有限元软件对拨转轴内部应力场分布规律进行了数值模拟,分析结果显示拨转轴内部存在高应力危险截面,结合拨转轴断口的宏观形貌特征分析得出拨转轴断裂失效的主要原因是应力集中和疲劳。提出了旨在降低拨转轴内部应力集中程度和应力水平的两种优化设计方案,并与原模型进行有限元对比分析,结果表明改进设计是合理的和可行的。Poker spindle is a key component in direction control mechanism for spear head of model KCM130 controllable impact spear. During the field test of a prototype, the direction control mechanism for spear head once failed due to poker spindle fracture. Aiming at this problem, loading conditions of the spear head under two different work postures are analyzed and dangerous work condition is determined as the loading condition when constructing a curved pole line. The distributing regularity of internal stress field of the poker spindle is mathematically simulated with finite element software and analysis results reveal that there are dangerous high stress sections inside the poker spindle. In association to macro profile and appearance characteristics of the poker spindle fracture, it is considered that main causes of the poker spindle fracture failure are concentrated stress and fatigue. Two optimal design schemes to reduce either internal stress concentration or stress level of the poker spindle are suggested. Compared and analyzed with original model by finite element method, the improvement designs are demonstrated rational and feasible.

关 键 词：非开挖技术 可控冲击矛拨转轴 断裂失效 优化设计 

分 类 号：TU607[建筑科学—建筑技术科学]