关键词: 紧固螺栓；拧紧力矩；生产噪声

Abstract: Due to the increasing proportion of bolted connection in heavy trucks, the tightening torque can not be guaranteed by using pneumatic wrenches in the workshop. It must be tested with a torque wrench before we know whether it is up to the standard or not. If it does not reach the standard, it needs to be repaired and re-tested, which seriously affects the production beat and has a large production noise. It is necessary to select a tool, which can not only ensure the tightening torque of bolts but also meet the requirements of noise reduction. Through the comparison of various types of fastening tools on the market, first of all, the suitable tools are determined and the hoisting mode of tools is designed according to the production site. Then the tightening experiments of various types of bolts are compared, and the bolts that meet the requirements are selected. Finally, it is confirmed that this process mode meets the production needs, when the bolt tightening torque reaches the set value, the equipment will prompt feedback to stop rotation, the bolt tightening torque does not need to be tested, and the production beat can be improved. The sanitary limit of noise level is guaranteed to be less than 85 decibels, which meets the noise requirements of the national production and assembly workshop.

Key words: tightening bolts; tightening torque; production noise