Research On Technology Of Tightening Bolts On Engine

Threaded connection is one method that is widely used in the mechanical assembly such as assemble of automobiles and internal combustion engine etc.. In order to ensure high quality of assembly, the tightening of threaded connection must be controlled. The primary methods for controlling thread tightening consist of torque application, torque-angle rotation and yield point. The purpose of research on the technology of tightening bolts on engines is to identify if the specified bolt pre-tightening requirement can be met when the bolts are tightened by different methods with the special equipment (such as automatic bolt tightening machine). The bolts on the connecting rod on DA462 engine are taken as example in the research, and the analysis on this type of bolt is made in the paper.In this paper, the advantage of applying torque-angle rotation method with the automatic bolts tightening machine is clarified and the different quality and effects of tightening bolts on engine connecting rod depending upon the different tightening tools and methods used is described through the analysis of thread tightening principle and comparison of a number of collected test data. Meanwhile it is also described how to adjust the related technical requirements of bolt tightening and how to realize the control of threaded connection quality after the bolts are tightened on connecting rod with the Atlas automatic tightening machine and torque-angle rotation method so as to assure high quality of assembling bolts on connecting rod through further test comparison. In the paper, it is stated how to make identification for reverse disassembly and check for the tightening torque limit of bolts on connecting rod so as to reach the target of controlling thread...