现代制造技术与装备
現代製造技術與裝備
현대제조기술여장비
Modern Manufacturing Technology and Equipment
2015年
5期
72-74
,共3页
挖掘机%销轴%油孔%疲劳失效
挖掘機%銷軸%油孔%疲勞失效
알굴궤%소축%유공%피로실효
excavator%pin%oil hole%fatigue fracture
挖掘机的销轴在工作过程中发生断裂。本文通过对断裂销轴的宏观断口、微观形貌、显微组织、化学成分、材料硬度及销轴的受力等分析，结果表明，销轴断裂为典型的疲劳断裂。疲劳源位于油孔处，属油孔部位应力集中造成的。因此，油孔位置设计不合理是销轴断裂的主要原因。另外，疲劳源始于油孔内的切削刀痕，切削刀痕也是销轴断裂的原因之一。结合以上分析，本文提出了解决问题的方法，优化了工艺路线方案，为提高销轴的使用寿命指明了方向。
挖掘機的銷軸在工作過程中髮生斷裂。本文通過對斷裂銷軸的宏觀斷口、微觀形貌、顯微組織、化學成分、材料硬度及銷軸的受力等分析，結果錶明，銷軸斷裂為典型的疲勞斷裂。疲勞源位于油孔處，屬油孔部位應力集中造成的。因此，油孔位置設計不閤理是銷軸斷裂的主要原因。另外，疲勞源始于油孔內的切削刀痕，切削刀痕也是銷軸斷裂的原因之一。結閤以上分析，本文提齣瞭解決問題的方法，優化瞭工藝路線方案，為提高銷軸的使用壽命指明瞭方嚮。
알굴궤적소축재공작과정중발생단렬。본문통과대단렬소축적굉관단구、미관형모、현미조직、화학성분、재료경도급소축적수력등분석，결과표명，소축단렬위전형적피로단렬。피로원위우유공처，속유공부위응력집중조성적。인차，유공위치설계불합리시소축단렬적주요원인。령외，피로원시우유공내적절삭도흔，절삭도흔야시소축단렬적원인지일。결합이상분석，본문제출료해결문제적방법，우화료공예로선방안，위제고소축적사용수명지명료방향。
Pin of excavator breakage occurs during operation, through the macroscopic observation and analysis to the fracture, metallurgical structure analysis under microscope, Microscopic analysis of the electron microscope, chemical composition analysis, hardness testing analysis. Mechanical Performance Analysis and so on .The results show that the fracture of the pin is typical brittle Fatigue fracture and belongs to early failure.pin caused stress concentration at the hole and ,fatigue crack initiation a and propagation at the hole located.The position of the hole design unsuitable is one of the reasons pin breakages. leaving traces of the existence of lane geometry gap after turning when turning hole chamfering.Notched fatigue and the gap causing stress concentration is also one of the reasons that pin fractures.Finally, given above the problems identified find solutions to problems and further optimize the process route programs to improve the life of the pin.
