2-3拧紧曲线分析演示课件.ppt

Cliquez pour modifier le style du titre,Cliquez pour modifier les styles du texte du masque,Deuxime niveau,Troisime niveau,Quatrime niveau,Cinquime niveau,*,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,Fina,l,:,扭矩斜率,快速下旋,Rundown,扭矩,/,角度,Torque/Angle,T(s),Torque or Angle,最终拧紧,Final,1.,快速下旋,Rundown,2.,最终拧紧,Final,工件被夹紧,Parts clamped,OK,T/,形成扭矩,拧紧过程与曲线分析,Tightening process and curve analysis,连接的特性,5,机械设备旋转状态,Torque,Time,min.torque,Max.torque,Total Angle,Angle,6,Upper limit,Lower limit,Starting 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？,8,9,Stick 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）,10,Stick 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,塑性区域,弹性区域,螺栓受力分析,螺栓拧紧到塑性区域,Bolts tightened in plastic area,MULTICVIL II&EME60-30J,Tension,Torque,Torque,Tension,Torque 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&Tension=66 kN,At 400:Torque 151 Nm&Tension=69 kN,At 600:Torque 149 Nm&Tension=70 kN,1,2,3,4,5,这条是什么曲线？,拉伸力曲线,-,特殊软件合成！,扭矩曲线,？,夹紧力曲线,？,MULTICVIL II&EME60-30J,Tension,Torque,Torque,Tension,Torque rate between 1-2=0,23 kN/,Torque rate between 3-4=0,025 kN/,Torque rate between 4-5=0,006 kN/,At 160(3):Torque 128 Nm&Tension=55 kN,At 320(4):Torque 128 Nm&Tension=59 kN,At 480(5):Torque 130 Nm&Tension=60 kN,1,2,3,4,5,螺栓拧紧到塑性区域,Bolts tightened in plastic area,800&900,拧紧到塑性区域,MULTICVIL II&EME60-30J,Curve 800,:one bolt,Angle 160 tension 58 kN,Angle 320 tension 61 kN,Angle 480 tension 63 kN,Curve 900,:another bolt,Angle 160 tension 55 kN,Angle 320 tension 59 kN,Angle 480 tension 60 kN,拧紧到屈服点之后,:,负的扭矩斜率,这几条曲线的含义？,拧紧到屈服点之后,:,负的扭矩斜率,扭矩拧紧,+,扭矩斜率监控,Torque strategy+torque rate,Torque rate results on 3 steps,Still in the elastic area of the bolt,22,Torque rate results on 3 steps,Tightening over the elastic area of the bolt,扭矩拧紧,+,扭矩斜率监控,Torque strategy+torque rate,23,Torque rate results on 2 steps:first one and last one,Tightening over the elastic area of the bolt,Torque rate,Torque rate,角度拧紧,+,扭矩斜率监控,Angle,strategy+torque rate,24,Torque rate results on last two steps,Tightening over the elastic area of the bolt,Torque rate,Torque rate,角度拧紧,+,扭矩斜率监控,Angle,strategy+torque rate,25,Torque rate results on the first and last step different settings for torque rate parameters,Torque rate,Torque rate,螺栓受力的什么区域？,角度拧紧,+,扭矩斜率监控,Angle,strategy+torque rate,26,Torque 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 rate,27,Torque 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 rate,28,Torque 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 rate,29,More Than Productivity,