拧紧技术_与工具.ppt

EB tools low quality bolt).重复性和准确度与扭矩控制一样， 但可以容易地检查出紧固件摩擦系数的变化 （螺栓尺寸大，螺栓质量差等）•That way the variation in tension may remain between ± 50%. 张力波动范围依然是 ± 50%.Example of application应用举例角度监测可以识别螺栓在扭紧过程中状态扭矩控制＋角度监测策略效果:Tightening strategies 拧紧策略• torque• torque + angle monitoring• angle + torque monitoring角度控制+扭矩监控• yield point strategy• prevailing torque• continuous torqueCURVES Torque & Angle / Time 扭矩/角度/时间 曲线Angle thresholdTimeTorqueTorque progressFinal torqueFinal anglePeak torqueanglemax. min.Angle progressmax.min.Target angletightening + spindle torsionspindle torsionACCEPTED curves 合格曲线3 different torque rates TorqueAngle thresholdwindow of final torqueTarget anglemin.anglemax.min.max.123REJECTED curves 不合格曲线TorqueAngle thresholdwindow of final torqueTarget anglemin.anglemax.min.max.RejectReject• hole not completely tapped • larger size of the boltTarget windowRESULTS with Angle & Torque control strategy: 角度控制和扭矩监测策略效果:•To give better tension, repeatability and accuracy than previous strategies.取得更好的张力，重复性和精确性都优于先前的控制策略•It also detects any tightening problems. 同时也能检测拧紧的问题•According to friction coefficient and assembly elasticity, the tension accuracy is about ±15 to 25%. 根据摩擦因素和拧紧的弹性形变，螺栓张 力的精确度在±15 to 25%. Tightening strategies 拧紧策略• torque• torque + angle monitoring• angle + torque monitoring• yield point strategy屈服点控制• prevailing torque• continuous torquePRINCIPLE原理:TorqueAnglefinal angleAngle thresholdstarting torque rate calculation P0 =1 to 32 degrees sample sizeFinal torqueYield pointcalculation every degree0CPCURVES analysis 曲线分析020.40.60.811.21.41.61.822.22.41002003004005006007007508001050100150Torque (Nm)Angle (dg)Torque rate (milliNm/dg)Time plastic area with angle beyond the yieldangle threshold% of target torque rate decreaseTorque rate max.Reference torque rate Torque rate min.50100150200250first sample size 1 to 32 degreesRESULTS yield point strategy: 屈服点控制策略的结果•The bolt tension directly depends on its mechanical characteristics. Consequently repeatability and accuracy are better than the angle and torque control strategy and it also detects any tightening problems.螺栓张力直接取决于它自身的机械特性。

结果的重复性和精确性比角度控制和扭矩控制更好，而且也能检测拧紧过程中出现的问题•It allows use of the bolts to their maximum performance to get the best assembly with maximum safety.它能发挥螺栓的最大性能从而取得最好的拧紧质量，同时最大程度的保证拧紧质量的安全性Tightening strategies 拧紧策略• torque• torque + angle monitoring• angle + torque monitoring• yield point strategy• prevailing torque摩擦力扭矩• continuous torqueCURVES Torque / Time 扭矩时间曲线图TorqueTimeSafety torquemin. torquemax. torqueStart data acquisitionData inhibition by time or angle Stop data acquisitionTorque to start rotationAverage value calculation during a programmed angleTarget angleTightening strategies 拧紧策略• torque• torque + angle monitoring• angle + torque monitoring• yield point strategy• prevailing torque• continuous/stall torque失速扭矩Stall TORQUE 失速扭矩Torquestall timeContinuous torqueAngle thresholdTimemax. torqueFinal angleMore Than Productivity。