【摘要】 对断裂的圆弧轴齿轮进行了宏观断口分析、硬度测试和显微组织分析。结果表明,圆弧轴齿轮为旋转弯曲疲劳断裂。表面尖锐缺口处存在应力集中,表面渗碳硬度偏高,加大了缺口处的应力集中,疲劳源在表面的缺口处产生,在弯曲及扭转力的作用下,裂纹进一步扩展,直至最后断裂。并提出了相应的改进措施。更多还原

【Abstract】 The cracking of arc axle gear was analyzed through macroscopic appearances observation,hardness test and microstructure analysis.The results show that cracking of the arc axle gear was caused by rotation bending fatigue failure.Stress concentration existing in surface sharp notch and high hardness resulting from carburized surface increase stress concentration and initiate crack.The cracks propagate with bending and twisting force,and at last fracture.The improving measurement was also put forward.更多还原