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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。
Dial axis is KCM130-type controllable spear spear head control mechanism in the key components. In the prototype of the outdoor test process has occurred due to the dial shaft rupture caused spearhead control failure. Aiming at the failure problem of the dial shaft, the stress state of the dial shaft when the spear head is in two different working positions is analyzed, and the bearing condition of the dial shaft is determined as the dangerous working condition when the curve of the construction curve is drilled. The finite element software was used to simulate the distribution of internal stress field in the dial shaft. The results showed that there was high stress dangerous cross section inside the dial shaft. The main cause of the failure of dial shaft was found by analyzing the macroscopic features of the dial shaft. Concentration and fatigue. Two optimization schemes aiming at reducing the stress concentration and stress concentration in the rotating shaft are proposed. The results of comparison with the original model show that the improved design is reasonable and feasible.