動態(tài)扭矩與靜態(tài)殘余扭矩ppt課件

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動態(tài)扭矩與靜態(tài)殘余扭矩,1,一個世紀的創(chuàng)新 Desoutter – A Century of Innovation,CVI3,2014年的主要產品 Main new products 2014,E-LIT,新的辦公大樓 The new headquater in Nantes,Auto screwfeeder,1914年Desoutter工廠 Desoutter plant in 1914,2,2,我們關注的行業(yè) The main focused segments,3,汽車工業(yè) Motor Vehicle Industry,航空航天 Aero plane & Aerospace,輕工裝配 Light Assembly,通用工業(yè) General Industry,3,不同的階段的扭矩值torque in different process,生產過程中in manufacture process,下線檢測offline test,4,不同的階段的扭矩值torque in different process,生產過程中in manufacture process,下線檢測offline test,35 Nm OK,30 Nm,≠,5,生產過程中——動態(tài)扭矩Dynamic torque,動態(tài)扭矩（Dynamic torque）: 動態(tài)扭矩是指緊固件在被緊固過程中測量得到的峰值，一般來說，是由動力工具施加得到動態(tài)扭矩，動態(tài)扭矩是在擰緊過程中測量的。動態(tài)扭矩產生的對于螺栓的軸向預緊力滿足工程上對預緊力的要求。 Dynamic torque , measured as the peak torque during the tightening fasteners, in general, is obtained by applying a power tool dynamic torque, dynamic torque is measured during tightening. Dynamic torque generated by the axial preload bolt preload to meet the engineering requirements.,,有加速度產生accelerations,6,下線/線上檢測——靜態(tài)扭矩Static torque,靜態(tài)扭矩(Static torque): 一個緊固件被緊固好之后，將其在擰緊方向上繼續(xù)旋轉的瞬間所需要的扭矩。靜態(tài)扭矩是在緊固之后測量的。 Static torque, measured after the fastener is tightened, is equal to the torque when fastener continues to rotate in the direction of tightening needed. Static torque is measured after tightening. 檢測扭矩（Audit torque）： 靜態(tài)扭矩標準時用來監(jiān)控生產過程的穩(wěn)定性，因此又稱為檢測扭矩。 Static torque standard used to monitor the stability of the production process, so-called audit torque.,沒有加速度產生No accelerations,7,動態(tài)扭矩和靜態(tài)扭矩Dynamic torque and static torque,動態(tài)力矩 Dynamic torque,殘余力矩 static torque,表面間的摩擦系數,螺紋副的摩擦系數,工件材料、幾何形狀、連接特性,涂層,涂表面處理,支撐件的粗糙度,材料松弛,螺栓硬度、批次,人、機、料,8,動態(tài)扭矩和靜態(tài)扭矩Dynamic torque and static torque,生產過程中in manufacture process,下線檢測offline test,哪個扭矩值更重要？ Which one is important?,重要！,重要！,9,動態(tài)扭矩和靜態(tài)扭矩Dynamic torque and static torque,動態(tài)力矩—生產過程中的扭矩 可以監(jiān)控、反應擰緊裝配過程的狀態(tài)、結果以及工藝能力,,√,10,動態(tài)扭矩和靜態(tài)扭矩Dynamic torque and static torque,殘余扭矩—檢測扭矩 擰緊裝配完成后，相對穩(wěn)定的螺栓連接狀態(tài),,√,11,這樣一個現(xiàn)象One phenomena,35Nm,30Nm？,,一段時間后Later,12,這樣一個現(xiàn)象One phenomena,35Nm,40Nm？,,一段時間后Later,13,ISO5393 定義連接的硬度Joint definition,硬連接 α 720,扭矩,100%,螺栓開始受力,30,720,,,α, 角度,,,,,,,,,,,硬,軟,0,5%,達到目標扭矩,,,,,14,硬鏈接Hard Joint,40Nm？,,一段時間后Later,35Nm,,,15,軟鏈接Soft Joint,30Nm,,一段時間后Later,35Nm,,T (Nm),時間,,,,,,,扭矩衰減,16,動態(tài)扭矩和靜態(tài)扭矩Dynamic torque and static torque,VDI——德國工程師協(xié)會 VDI2230、VDI2862（汽車行業(yè)擰緊應用）、VDI2647 （動態(tài)力矩檢測） VDI2230高強度螺栓連接的系統(tǒng)計算：螺栓的扭矩彈性回彈，動態(tài)扭矩和靜態(tài)扭矩的比值范圍會較大，比如0.85-1.3,17,,當動靜態(tài)扭矩不一致的時候如何評判？ 制定動靜態(tài)扭矩的對比表 當動靜態(tài)扭矩超出比值后/比值不穩(wěn)定，如何分析？ 通過魚骨圖逐項分析 有哪些裝配過程中的誤區(qū)，導致動靜態(tài)扭矩不一致？,18,制定動靜態(tài)扭矩的對比表setup coefficient of dynamic torque and static torque,19,制定動靜態(tài)扭矩的對比表setup coefficient of dynamic torque and static torque,動態(tài)力矩 dynamic torque,靜態(tài)殘余力矩 static torque,軟連接——扭矩衰減,理想狀況—少數的連接,硬連接,,20,動態(tài)力矩與殘余力矩—需要關注以下情況 Focus on following issues,靜態(tài)力矩離散,靜態(tài)力矩過小,,動態(tài)力矩 dynamic torque,靜態(tài)殘余力矩 static torque,21,當靜態(tài)扭矩異常時如何診斷？ How to diagnose when static torque abnormal,,,裝配過程 Assembly process,動態(tài)扭矩結果,裝配工藝,工具/設備,操作者,擰緊速度,擰緊策略,,材料—連接 Parts and joint,幾何/連接特性,螺栓是否同一批次,工件材料一致性,,裝配順序,,2,1,靜態(tài)力矩離散,靜態(tài)力矩過小,？,22,靜態(tài)力矩過小的常見原因 the reason of static torque is too low,靜態(tài)力矩過小,,扭矩衰減 torque attenuation,23,哪些因素導致扭矩衰減main reasons cause torque attenuation,被裝配件的表面粗糙度：材料的變形--局部嵌入 The roughness of the surface of parts 彈性連接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 過快的裝配速度、不合理的裝配動作 unreasonable assembly speed and sequence 其他：如裝配過程中的溫度 other reason: temperature,24,哪些因素導致扭矩衰減main reasons cause torque attenuation,被裝配件的表面粗糙度：材料的變形--局部嵌入 The roughness of the surface of parts 彈性連接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 過快的裝配速度、不合理的裝配動作 unreasonable assembly speed and sequence 其他：如裝配過程中的溫度 other reason: temperature,25,26,哪些因素導致扭矩衰減main reasons cause torque attenuation,被裝配件的表面粗糙度：材料的變形--局部嵌入 The roughness of the surface of parts 彈性連接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 過快的裝配速度、不合理的裝配動作 unreasonable assembly speed and sequence 其他：如裝配過程中的溫度 other reason: temperature,盡量避免部件的表面粗糙度過大 avoid too high friction,,27,哪些因素導致扭矩衰減main reasons cause torque attenuation,被裝配件的表面粗糙度：材料的變形--局部嵌入 The roughness of the surface of parts 彈性連接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 過快的裝配速度、不合理的裝配動作 unreasonable assembly speed and sequence 其他：如裝配過程中的溫度 other reason: temperature,盡量避免部件的彈性過大 avoid high elastic part,,28,哪些因素導致扭矩衰減main reasons cause torque attenuation,被裝配件的表面粗糙度：材料的變形--局部嵌入 The roughness of the surface of parts 彈性連接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 過快的裝配速度、不合理的裝配動作 unreasonable assembly speed and sequence 其他：如裝配過程中的溫度 other reason: temperature,,降低最終擰緊的速度 reduce tightening speed 分步擰緊—如分步驟設置目標扭矩60%--80%--100% Multiple steps tightening 使用擰緊(如至目標扭矩80%)+反松+最終擰緊的方法 use reverse and multiple steps tightening,29,被裝配件的表面粗糙度：材料的變形--局部嵌入 The roughness of the surface of parts 彈性連接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 過快的裝配速度、不合理的裝配動作 unreasonable assembly speed and sequence 其他：如裝配過程中的溫度 other reason: temperature,哪些因素導致扭矩衰減main reasons cause torque attenuation,,,,,,,,殘余扭矩減小、夾緊力未達到,最終扭矩: 100%,30,被裝配件的表面粗糙度：材料的變形--局部嵌入 The roughness of the surface of parts 彈性連接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 過快的裝配速度、不合理的裝配動作 unreasonable assembly speed and sequence 其他：如裝配過程中的溫度 other reason: temperature,哪些因素導致扭矩衰減main reasons cause torque attenuation,選用合適的工具 use right tool 多軸同步擰緊 multiple spindle fastening 擰緊的次序 right assembly sequence,,31,哪些因素導致扭矩衰減main reasons cause torque attenuation,被裝配件的表面粗糙度：材料的變形--局部嵌入 The roughness of the surface of parts 彈性連接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 過快的裝配速度、不合理的裝配動作 unreasonable assembly speed and sequence 其他：如裝配過程中的溫度 other reason: temperature,避免不合理的摩擦 avoid unreasonable friction 避免熱膨脹系數不同/相差過大 avoid too high difference of coefficient of thermal expansion,,32,動態(tài)扭矩和靜態(tài)扭矩Dynamic torque and static torque,有沒有公式? Any formula,33, Info.desoutter-china@ Tel: 021-24165100 Fax: 021-24165202 上海市松江區(qū)新橋鎮(zhèn)莘磚公路518號37號樓,聯(lián)系方式 How to Find Desoutter,34,More Than Productivity,35,