拧紧基础知识.ppt

美国英格索兰公司拧紧基础知识 POSITIVES High power to weight ratio Fast No Reaction Non Technical Maintenance Compact Inexpensive NEGATIVES Little or No control Noisy High Vibration 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. 电动拧紧机 POSITIVES Accurate Low Noise Clean Closed - Loop Feedback Ergonomic Low Running Cost Can be interfaced with PLCs and BCRs NEGATIVES High Initial Investment Torque Reaction Two hand operation (angle tools) 拧紧机控制柜 拧紧工具选择 拧紧工具选择综述 Reliable bolted joints are dependent on many factors: Fastener quality and type Consistency of joint materials Assembly tool used Assembly method or strategy Operator Influence Frictional Scatter Maintenance of bolt clamp load Tool and assembly method selection should occur early in the design process to be most effective 扭矩测量术语 静态扭矩 - Torque Value That Exist Without Producing Rotation in a Fastener - Used Only as an Indication of a Minimum Torque 扭矩测量 “标记法 Back-to-the-Mark” 准确度 : 高 方便性/速度 : 低 Mark then loosen Bolt. Tighten Back to Original Position Truly Checks Dynamic Tightening Torque Works Only in Tapped Holes Time Consuming 扭矩测量 “Off-torque” 准确度 : 低 方便性/速度 : 中 Measure Peak Loosening Torque Measurement of Off-Torque Does Not Relate Accurately to Tightening Torque 扭矩测量 带响声手动扭矩扳手 准确度 : 低 方便性/速度 : 高 Apply Torque Until Wrench Clicks at Set Torque Not a Real Audit Method -- Basically a Torque Re-Application Method Only Gives Assurance That Inspected Fastener Has Been Tightened 扭矩测量 扭矩手动扳手 准确度 : 低 方便性/速度 : 中 Apply Torque Until Operator Senses Movement Read Peak Torque on Tool Indicator Subject to Operators Skill and Joint Conditions 扭矩测量 扭矩/角度 扳手带外部记录仪器 准确度 : 较高 方便性/速度 : 低 Capable of Measuring Dynamic Torque Equipment Is Bulky and Difficult to Use 扭矩测量 扭矩/角度 力矩扳手带有动态扭矩监测算法 准确度 : 高 方便性/速度 : 高 Truly Check