正确使用扭矩扳手

在机械装配过程中，紧固件的扭矩大小是装配工作的关键。如果扭矩过大，严重超过材料的屈服极限，会使紧固件的螺纹断裂、失效，紧固失败。如果扭矩过小，则达不到紧固夹紧效果，会造成紧固失效。扭矩扳手是一种带有扭矩测量机构的拧紧计量器具，用于紧固螺栓和螺母，并能检测出拧紧的扭矩值。文章主要阐述目前常用于生产流水线扭矩控制的手动扭矩扳手的工作原理以及正确的校验方法、使用方法。

How to Correctly Use Torque Wrench

In the process of assembling of parts, how big the torque wrench is become the key to the assembling work. If it is too big that surpass the maximum limits of the material, the screw will be cracked, becomes invalid. If it＇ s too small, it can not tighten effectively and produces tighten faulty. Torque wrench is a tool that has the function to measure tighten screw and can calculate the twisting moment. The article gives introduction to rationale behind torque wrench that is used commonly in production lines and the right way to use and examine.