1、擰緊曲線分析 How analyze the tightening curve,2,曲線分析的目的purpose,找出連接的特性-軟硬連接 機(jī)械設(shè)備旋轉(zhuǎn)狀態(tài) 螺栓連接狀態(tài) 擰緊不合格的原因 螺栓的受力狀態(tài),3,查看曲線時(shí)的標(biāo)識(shí),Msmotor stop馬達(dá)停止 Atangle threashold角度閾值（角度開始）,最終擰緊Final: 扭矩斜率,快速下旋Rundown,扭矩/角度 Torque/Angle,T(s),Torque or Angle,最終擰緊Final,1. 快速下旋Rundown,2. 最終擰緊Final,工件被夾緊Parts clamped,OK,T / ,形成扭矩,擰緊

2、過程與曲線分析 Tightening process and curve analysis,5,連接的特性,6,機(jī)械設(shè)備旋轉(zhuǎn)狀態(tài),Upper limit,Lower limit,Starting angle,機(jī)械設(shè)備旋轉(zhuǎn)狀態(tài),8,螺栓連接狀態(tài)-Stick Slip的典型扭矩曲線,這樣的曲線合格嗎？,9,10,Stick Slip常見來源,Stick Slip常見來源 In general: 通常： 工件表面粗糙 螺紋副摩擦系數(shù)高 軟連接，擰緊過程中發(fā)熱嚴(yán)重 擰緊速度太高（造成螺栓涂層脫落） Type 1:類型1： 某些涂層（如孔密封漆，達(dá)克羅，交美特等） 某些一體式帶墊片的螺栓 螺栓頭材料軟

3、Type 2:類型2： 高L/D（長(zhǎng)度/直徑）比的螺栓 長(zhǎng)螺紋 尤其是軟性材料 螺紋摩擦力/螺栓頭摩擦力比值太高（包括螺紋半徑/螺栓頭半徑）,11,Stick Slip:工具需要考慮的因素,工具需要避免以下情況： 高速擰緊 多步擰緊 在高扭矩點(diǎn)重新啟動(dòng) 在各步驟間沒有扭矩保持/加速度太大 工具的齒輪比太高（工具馬達(dá)太小，靠齒輪組放大扭矩） 工具反作用力臂剛性不足,12,如何避免Stick Slip？,降低加速度 避免高扭矩啟動(dòng) 步驟間保持扭矩 降低擰緊速度 檢查擰緊過程尤其是引起發(fā)熱的步驟 降低摩擦系數(shù) 加強(qiáng)反作用力臂的剛性（力臂或者延長(zhǎng)桿） 使用大尺寸馬達(dá)和小齒輪比（降低工具內(nèi)的能量消耗）,

4、螺栓連接狀態(tài),這顆螺栓有沒有預(yù)擰緊？,扭矩突變非常大,螺栓連接狀態(tài),分析螺栓連接狀態(tài) 使用了什么擰緊策略？,螺栓受力分析,塑性區(qū)域,彈性區(qū)域,螺栓受力分析,螺栓擰緊到塑性區(qū)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

5、 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,這條是什么曲線？,拉伸力曲線-特殊軟件合成！,扭矩曲線？,夾緊力曲線？,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

6、= 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,螺栓擰緊到塑性區(qū)域Bolts tightened in plastic area,800 & 900 擰緊到塑性區(qū)域,MULTICVIL II & EME60-30J,擰緊到屈服點(diǎn)之后: 負(fù)的扭矩斜率,這幾條曲線的含義？,擰緊到屈服點(diǎn)之后: 負(fù)的扭矩斜率,22,扭矩?cái)Q緊+扭矩斜率監(jiān)控Torq

7、ue strategy + torque rate,Torque rate results on 3 steps Still in the elastic area of the bolt,23,Torque rate results on 3 steps Tightening over the elastic area of the bolt,扭矩?cái)Q緊+扭矩斜率監(jiān)控Torque strategy + torque rate,24,Torque rate results on 2 steps: first one and last one Tightening over the elastic

8、 area of the bolt,角度擰緊+扭矩斜率監(jiān)控Angle strategy + torque rate,25,Torque rate results on last two steps Tightening over the elastic area of the bolt,角度擰緊+扭矩斜率監(jiān)控Angle strategy + torque rate,26,Torque rate results on the first and last step different settings for torque rate parameters,螺栓受力的什么區(qū)域？,角度擰緊+扭矩斜率

9、監(jiān)控Angle strategy + torque rate,27,Torque rate results on the first and last step different settings for torque rate parameters,角度擰緊+扭矩斜率監(jiān)控Angle strategy + torque rate,28,Torque rate results on the first and last step different settings for torque rate parameters,角度擰緊+扭矩斜率監(jiān)控Angle strategy + torque rate,29,Torque rate r