动态扭矩与静态残余扭矩ppt课件

动态扭矩与静态残余扭矩,1,一个世纪的创新 Desoutter A Century of Innovation,CVI3,2014年的主要产品 Main new products 2014,E-LIT,新的办公大楼 The new headquater in Nantes,Auto screwfeeder,1914年Desoutter工厂 Desoutter plant in 1914,2,2,我们关注的行业 The main focused segments,3,汽车工业 Motor Vehicle Industry,航空航天 Aero plane & Aerospace,轻工装配 Light Assembly,通用工业 General Industry,3,不同的阶段的扭矩值torque in different process,生产过程中in manufacture process,下线检测offline test,4,不同的阶段的扭矩值torque in different process,生产过程中in manufacture process,下线检测offline test,35 Nm OK,30 Nm,5,生产过程中动态扭矩Dynamic torque,动态扭矩（Dynamic torque）: 动态扭矩是指紧固件在被紧固过程中测量得到的峰值，一般来说，是由动力工具施加得到动态扭矩，动态扭矩是在拧紧过程中测量的。动态扭矩产生的对于螺栓的轴向预紧力满足工程上对预紧力的要求。 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.,有加速度产生accelerations,6,下线/线上检测静态扭矩Static torque,静态扭矩(Static torque): 一个紧固件被紧固好之后，将其在拧紧方向上继续旋转的瞬间所需要的扭矩。静态扭矩是在紧固之后测量的。 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. 检测扭矩（Audit torque）： 静态扭矩标准时用来监控生产过程的稳定性，因此又称为检测扭矩。 Static torque standard used to monitor the stability of the production process, so-called audit torque.,没有加速度产生No accelerations,7,动态扭矩和静态扭矩Dynamic torque and static torque,动态力矩 Dynamic torque,残余力矩 static torque,表面间的摩擦系数,螺纹副的摩擦系数,工件材料、几何形状、连接特性,涂层,涂表面处理,支撑件的粗糙度,材料松弛,螺栓硬度、批次,人、机、料,8,动态扭矩和静态扭矩Dynamic torque and static torque,生产过程中in manufacture process,下线检测offline test,哪个扭矩值更重要？ Which one is important?,重要！,重要！,9,动态扭矩和静态扭矩Dynamic torque and static torque,动态力矩生产过程中的扭矩 可以监控、反应拧紧装配过程的状态、结果以及工艺能力,10,动态扭矩和静态扭矩Dynamic torque and static torque,残余扭矩检测扭矩 拧紧装配完成后，相对稳定的螺栓连接状态,11,这样一个现象One phenomena,35Nm,30Nm？,一段时间后Later,12,这样一个现象One phenomena,35Nm,40Nm？,一段时间后Later,13,ISO5393 定义连接的硬度Joint definition,硬连接 720,扭矩,100%,螺栓开始受力,30,720, 角度,硬,软,0,5%,达到目标扭矩,14,硬链接Hard Joint,40Nm？,一段时间后Later,35Nm,15,软链接Soft Joint,30Nm,一段时间后Later,35Nm,T (Nm),时间,扭矩衰减,16,动态扭矩和静态扭矩Dynamic torque and static torque,VDI德国工程师协会 VDI2230、VDI2862（汽车行业拧紧应用）、VDI2647 （动态力矩检测） VDI2230高强度螺栓连接的系统计算：螺栓的扭矩弹性回弹，动态扭矩和静态扭矩的比值范围会较大，比如0.85-1.3,17,当动静态扭矩不一致的时候如何评判？ 制定动静态扭矩的对比表 当动静态扭矩超出比值后/比值不稳定，如何分析？ 通过鱼骨图逐项分析 有哪些装配过程中的误区，导致动静态扭矩不一致？,18,制定动静态扭矩的对比表setup coefficient of dynamic torque and static torque,19,制定动静态扭矩的对比表setup coefficient of dynamic torque and static torque,动态力矩 dynamic torque,静态残余力矩 static torque,软连接扭矩衰减,理想状况少数的连接,硬连接,20,动态力矩与残余力矩需要关注以下情况 Focus on following issues,静态力矩离散,静态力矩过小,动态力矩 dynamic torque,静态残余力矩 static torque,21,当静态扭矩异常时如何诊断？ How to diagnose when static torque abnormal,装配过程 Assembly process,动态扭矩结果,装配工艺,工具/设备,操作者,拧紧速度,拧紧策略,材料连接 Parts and joint,几何/连接特性,螺栓是否同一批次,工件材料一致性,装配顺序,2,1,静态力矩离散,静态力矩过小,？,22,静态力矩过小的常见原因 the reason of static torque is too low,静态力矩过小,扭矩衰减 torque attenuation,23,哪些因素导致扭矩衰减main reasons cause torque attenuation,被装配件的表面粗糙度：材料的变形-局部嵌入 The roughness of the surface of parts 弹性连接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 过快的装配速度、不合理的装配动作 unreasonable assembly speed and sequence 其他：如装配过程中的温度 other reason: temperature,24,哪些因素导致扭矩衰减main reasons cause torque attenuation,被装配件的表面粗糙度：材料的变形-局部嵌入 The roughness of the surface of parts 弹性连接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 过快的装配速度、不合理的装配动作 unreasonable assembly speed and sequence 其他：如装配过程中的温度 other reason: temperature,25,26,哪些因素导致扭矩衰减main reasons cause torque attenuation,被装配件的表面粗糙度：材料的变形-局部嵌入 The roughness of the surface of parts 弹性连接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 过快的装配速度、不合理的装配动作 unreasonable assembly speed and sequence 其他：如装配过程中的温度 other reason: temperature,尽量避免部件的表面粗糙度过大 avoid too high friction,27,哪些因素导致扭矩衰减main reasons cause torque attenuation,被装配件的表面粗糙度：材料的变形-局部嵌入 The roughness of the surface of parts 弹性连接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 过快的装配速度、不合理的装配动作 unreasonable assembly speed and sequence 其他：如装配过程中的温度 other reason: temperature,尽量避免部件的弹性过大 avoid high elastic part,28,哪些因素导致扭矩衰减main reasons cause torque attenuation,被装配件的表面粗糙度：材料的变形-局部嵌入 The roughness of the surface of parts 弹性连接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 过快的装配速度、不合理的装配动作 unreasonable assembly speed and sequence 其他：如装配过程中的温度 other reason: temperature,降低最终拧紧的速度 reduce tightening speed 分步拧紧如分步骤设置目标扭矩60%-80%-100% Multiple steps tightening 使用拧紧(如至目标扭矩80%)+反松+最终拧紧的方法 use reverse and multiple steps tightening,29,被装配件的表面粗糙度：材料的变形-局部嵌入 The roughness of the surface of parts 弹性连接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 过快的装配速度、不合理的装配动作 unreasonable assembly speed and sequence 其他：如装配过程中的温度 other reason: temperature,哪些因素导致扭矩衰减main reasons cause torque attenuation,残余扭矩减小、夹紧力未达到,最终扭矩: 100%,30,被装配件的表面粗糙度：材料的变形-局部嵌入 The roughness of the surface of parts 弹性连接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 过快的装配速度、不合理的装配动作 unreasonable assembly speed and sequence 其他：如装配过程中的温度 other reason: temperature,哪些因素导致扭矩衰减main reasons cause torque attenuation,选用合适的工具 use right tool 多轴同步拧紧 multiple spindle fastening 拧紧的次序 right assembly sequence,31,哪些因素导致扭矩衰减main reasons cause torque attenuation,被装配件的表面粗糙度：材料的变形-局部嵌入 The roughness of the surface of parts 弹性连接材料：尤其是塑料或密封件 elastic joint parts: such as plastic and rubber washer 过快的装配速度、不合理的装配动作 unreasonable assembly speed and sequence 其他：如装配过程中的温度 other reason: temperature,避免不合理的摩擦 avoid unreasonable friction 避免热膨胀系数不同/相差过大 avoid too high difference of coefficient of thermal expansion,32,动态扭矩和静态扭矩Dynamic torque and static torque,有没有公式? Any formula,33, Info.desoutter-china Tel: 021-24165100 Fax: 021-24165202 上海市松江区新桥镇莘砖公路518号37号楼,联系方式 How to Find Desoutter,34,More Than Productivity,35,