拧紧基础知识讲解—修改版.ppt

美国英格索兰公司拧紧基础知识;;POSITIVES正版的 High power to weight ratio高的功率重量比 Fast速度快 No Reaction反作用力小 Non Technical Maintenance不需要专门的维护 Compact紧凑 Inexpensive物美价廉;冲击扳手结构;;Once pre set torque is delivered to the joint, Clutch spring gets compressed triggering the mechanism to shut off air supply to the motor, providing excellent repeatability.一旦预先设定的扭矩传递到结合处，离合器弹簧压缩，触发空气供应切断机制运行 ，并能重复性工作，且效果优良。;POSITIVES Accurate Low Noise Clean Closed - Loop Feedback Ergonomic Low Running Cost Can be interfaced with PLCs and BCRs;拧紧机控制柜;拧紧工具选择;拧紧工具选择综述;扭矩测量术语;扭矩测量;扭矩测量;扭矩测量;扭矩测量;扭矩测量;扭矩测量;动态扭矩;工件连接基础知识;连接形式;TORQUE扭矩;连接形式;拧紧基础知识;扭矩和转角;拧紧基础;扭矩消耗到哪里去了?;拧紧曲线;拧紧曲线;;The variation in clamp loads is controlled by friction scatter. Using a very accurate wrench will not help preload scatter. However, a very inaccurate wrench will have a detrimental impact on preload scatter.夹紧力的变动收到摩擦散射的控制。使用非常精确的扳手不能缓解预紧力的散失。但是，非常不准确的扳手会对预紧力的散失产生不利影响。;扭矩控制拧紧;Step 1: Apply a Torque to Consolidate the JointComponents (Snug Torque) 第一步：施加扭矩来巩固部件的连接 Step 2: Turn the Fastener Through a Pre-determined Angle第二步:旋转紧固件至预先设定的角度 Originally Developed for Beyond Yield Tightening, Now Also Used in the Elastic Range 最初是为了超出屈服区的拧紧,现在也用在弹性区内 Requires Application Testing to Establish Snug Torque and Angle Parameters 需要通过试验建立适宜的转矩和角参数 Also known as: Turn of the Nut, Torque-Angle 也称为:螺母旋转法，扭矩-角度法 Preload Accuracy ±15%预紧力精确度±15%;角度控制;角度控制;角度控制;屈服点控制;屈服点控制;屈服点控制;;Clamp Load Scatter夹负荷分散;屈服点控制;拧紧错误;;;;拧紧错误;拧紧错误;拧紧错误;拧紧错误;拧紧错误;拧紧错误;Angle, q;Angle, q;Angle, q;案例分析;客户 : Swaraj Engines Ltd S发动机有限公司 问??? : Cylinder Head Leakage缸盖渗漏 分析 : Method of Tightening : Run down with Impact Wrench, final tightening to 14 Kg.m.by manual Torque Wrench 方法:先使用冲击扳手拧紧，再用手动扳手拧紧至14千克·米 Methodology: Sensor Expert set to JCS- Yield Mode with 4 degree capture angle, recorded Yield Torque data from 24 Cyl.Head Nuts Studs of Two Engines. 传感器专家测试了两台发动机的24个缸盖螺栓 的屈服强度 Findings:Nuts yielded at Average of 13.5 Kg.m Torque. 结果:螺栓