: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
离合器自动断气型扳手
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.
拧紧机控制柜
拧紧工具选择
Tightening Strategy
Maintainability
Data Collection
Power Source
Joint Criticality
Budget
Access to Fastener
(Size and Space Constraints)
Torque Level
Tool and assembly method selection should occur early in the design process to be most effective
扭矩测量术语
动态扭矩 - Peak Torque Measured During the Installation of a
Cycle Rate
Fastener and Drive Type
Operator Ergonomics
(Reaction, Tool Weight, Arm Position, Frequency)
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
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
Fastener Using a Power Tool - The Preferred and Most Accurate Measurement For Assembly Statistical process Control
静态扭矩
- Torque Value That Exist Without Producing Rotation in a Fastener - Used Only as an Indication of a Minimum Torque
冲击扳手结构
离合器型气动工具
POSITIVES
Good Repeatability Inexpensive Low Overshoot
NEGATIVES Torque Readout Run down speed Two Hand Operation (angle wrenches)
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
ห้องสมุดไป่ตู้
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
残留扭矩
- Torque Measured After Fastener is Installed by Rotating The Fastener in Tightening Direction - Can Have Significant Measurement Error depending on equipment used to Audit Torque
拧紧机资料之一
美国英格索兰公司
拧紧基础知识
工具形式及选择
冲击扳手
POSITIVES High power to weight ratio Fast No Reaction Non Technical Maintenance Compact Inexpensive
NEGATIVES Little or No control Noisy High Vibration
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)