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对高强度螺栓、螺母、垫圈进行表面磷化处理,可以大大降低扭矩系数及其离散率,大大改善预紧轴力的稳定性。扭矩系数降低50%左右,平均值一般为0.115~0.120,个别最高为0.147,标准差为0.0026~0.0098;预紧轴力离散率为0.016~0.096。各种二硫化钼润滑状态都有一定效果,磷化加二硫化钼润滑更是相得益彰。鉴于表面磷化处理,扭矩系数平均值能保证在0.110~0.150之间,标准差可以稳定在0.010以下,这已经很好了。不必再加二硫化钼润滑。二硫化钼润滑可以用于表面发黑处理的高强度螺栓。
High-strength bolts, nuts, washers on the surface phosphating treatment, can greatly reduce the torque coefficient and its dispersion rate, greatly improving the stability of the pre-stressed axial force. The torque coefficient is reduced by about 50%, the average value is generally 0.115 ~ 0.120, the highest one is 0.147 and the standard deviation is 0.0026 ~ 0.0098. The preloading axial force dispersion rate is 0.016 ~ 0.096. All kinds of molybdenum disulfide lubrication have a certain effect, phosphating and molybdenum disulfide lubrication is best. In view of the surface phosphating, the average torque coefficient can be guaranteed between 0.110 ~ 0.150, the standard deviation can be stabilized at 0.010 or less, which is already good. Do not have to add molybdenum disulfide lubrication. Molybdenum disulfide lubrication can be used for surface blackening of high strength bolts.