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1、拧紧曲线分析拧紧曲线分析How analyze the tightening curve曲线分析的目的purpose找出连接的特性-软硬连接机械设备旋转状态螺栓连接状态拧紧不合格的原因螺栓的受力状态2查看曲线时的标识Msmotor stop马达停止Atangle threashold角度阈值(角度开始)3最终拧紧Final:扭矩斜率扭矩斜率 快速下旋Rundown扭矩扭矩/角度角度Torque/AngleT(s)Torque or Angle最最终拧紧Final 1. 快速下旋Rundown2. 最终拧紧Final工件被夹紧Parts clampedOKT / 形成扭矩形成扭矩拧紧过程与曲线分
2、析Tightening process and curve analysis连接的特性5机械设备旋转状态TorqueTimemin. torqueMax. torqueTotal AngleAngle6Upper limitLower limitStarting angle机械设备旋转状态螺栓连接状态-Stick Slip的典型扭矩曲线这样的曲线合格吗?89Stick Slip常见来源Stick Slip常见来源In general: 通常:工件表面粗糙螺纹副摩擦系数高软连接,拧紧过程中发热严重拧紧速度太高(造成螺栓涂层脱落)Type 1:类型1:某些涂层(如孔密封漆,达克罗,交美特等)某些一
3、体式带垫片的螺栓螺栓头材料软Type 2:类型2:高L/D(长度/直径)比的螺栓长螺纹 尤其是软性材料螺纹摩擦力/螺栓头摩擦力比值太高(包括螺纹半径/螺栓头半径)10Stick Slip:工具需要考虑的因素工具需要避免以下情况:高速拧紧多步拧紧在高扭矩点重新启动在各步骤间没有扭矩保持/加速度太大工具的齿轮比太高(工具马达太小,靠齿轮组放大扭矩)工具反作用力臂刚性不足11如何避免Stick Slip?降低加速度避免高扭矩启动步骤间保持扭矩降低拧紧速度检查拧紧过程尤其是引起发热的步骤降低摩擦系数加强反作用力臂的刚性(力臂或者延长杆)使用大尺寸马达和小齿轮比(降低工具内的能量消耗)12螺栓连接状态这
4、颗螺栓有没有预拧紧?扭矩突变非常大螺栓连接状态分析螺栓连接状态使用了什么拧紧策略?螺栓受力分析螺栓受力分析塑性区域塑性区域弹性区域性区域螺栓受力分析螺栓受力分析螺栓拧紧到塑性区域Bolts tightened in plastic areaMULTICVIL II & EME60-30JTensionTorqueTorqueTensionTorque rate between 1-2 = 0,28 kN/Torque rate between 3-4 = 0,015 kN/Torque rate between 4-5 = 0,010 kN/At 200 : Torque 147 Nm & T
5、ension = 66 kNAt 400 : Torque 151 Nm & Tension = 69 kNAt 600 : Torque 149 Nm & Tension = 70 kN12345这条是什么曲条是什么曲线?拉伸力曲拉伸力曲线-特殊特殊软件合成!件合成!扭矩曲扭矩曲线?夹紧力曲力曲线?MULTICVIL II & EME60-30JTensionTorqueTorqueTensionTorque rate between 1-2 = 0,23 kN/Torque rate between 3-4 = 0,025 kN/Torque rate between 4-5 = 0,00
6、6 kN/At 160 (3): Torque 128 Nm & Tension = 55 kNAt 320 (4): Torque 128 Nm & Tension = 59 kNAt 480 (5): Torque 130 Nm & Tension = 60 kN12345螺栓拧紧到塑性区域Bolts tightened in plastic area800 & 900 拧紧到塑性区域MULTICVIL II & EME60-30JCurve 800 : one boltAngle 160 tension 58 kNAngle 320 tension 61 kNAngle 480 tens
7、ion 63 kNCurve 900 : another boltAngle 160 tension 55 kNAngle 320 tension 59 kNAngle 480 tension 60 kN拧紧到屈服点之后到屈服点之后: 负的扭矩斜率的扭矩斜率这几条曲几条曲线的含的含义?拧紧到屈服点之后到屈服点之后: 负的扭矩斜率的扭矩斜率扭矩拧紧+扭矩斜率监控Torque strategy + torque rateTorque rate results on 3 steps Still in the elastic area of the bolt22Torque rate results
8、on 3 steps Tightening over the elastic area of the bolt扭矩拧紧+扭矩斜率监控Torque strategy + torque rate23Torque rate results on 2 steps: first one and last oneTightening over the elastic area of the boltTorque rateTorque rate角度拧紧+扭矩斜率监控Angle strategy + torque rate24Torque rate results on last two stepsTight
9、ening over the elastic area of the boltTorque rateTorque rate角度拧紧+扭矩斜率监控Angle strategy + torque rate25Torque rate results on the first and last step different settings for torque rate parameters Torque rateTorque rate螺栓受力的什么区域螺栓受力的什么区域?角度拧紧+扭矩斜率监控Angle strategy + torque rate26Torque rate results on
10、the first and last step different settings for torque rate parameters 角度拧紧+扭矩斜率监控Angle strategy + torque rate27Torque rate results on the first and last step different settings for torque rate parameters 角度拧紧+扭矩斜率监控Angle strategy + torque rate28Torque rate results on the first and last step different settings for torque rate parameters 角度拧紧+扭矩斜率监控Angle strategy + torque rate29More Than ProductivityMore Than Productivity 结束束语若有不当之处,请指正,谢谢!若有不当之处,请指正,谢谢!