水布垭电厂水轮机顶盖分瓣面螺栓加工标准变更的可行性分析
Feasibility Analysis of Changing the Machining Standard for the Split Surface Bolts on the Hydro-turbine Top Cover in Shuibuya Hydropower Plant
吴盼盼 1杨力 1张国栋1
作者信息
- 1. 湖北清江水电开发有限责任公司检修公司,湖北 宜昌 443000
- 折叠
摘要
水布垭电厂机组扩修更换顶盖分瓣面螺栓,发黑处理过的新螺栓在设计拉伸压力出现无法达到规定拉伸值的情况.厂家通过现场对比试验,判断因顶盖分瓣面M80×6 螺栓拉伸量过大致螺纹发生破坏,螺栓拉伸后剩余伸长量过小,导致螺母和法兰之间存在间隙,拉伸力撤走后这部分间隙造成了回弹量过大超标,是使圆螺母卡涩无法转动的具体原因.并分析将螺栓加工标准更改为DIN2510 的可行性.
Abstract
During the extended overhaul of the hydro-turbine units in Shuibuya Hydropower Plant,the split surface bolts on the unit top cover were replaced.While,the new blackened bolts failed to reach the specified tensile value under the designed stretching pressure.On-site comparative tests were then conducted and it was determined that the excessive stretching of the M80×6 bolts on the top cover split surface caused thread damage.The remaining elongation of the bolts after stretching was too small,resulting in a gap between the nuts and the flange.After the stretching pressure was re-moved,the gap caused excessive rebound,which is the specific reason for the jam of the round nuts and the inability to rotate.Then,the feasibility of changing the bolt machining standard to DIN2510 is analyzed.
关键词
螺栓拉伸/预紧力/屈服强度Key words
bolt stretching/preload force/yield strength引用本文复制引用
出版年
2024
NETL
NSTL
万方数据