Research on Assembly Process of Bolt Group Under the Influence of Rabbet Structure
The bolt-rabbet connection structure has a wide range of applications in industrial products such as aerospace,ma-chine tools,high-speed rail,and tunneling equipment.However,the existence of the rabbet structure affects the consistency of the final bolt pre-tightening force distribution,and in view of the lack of relevant theoretical and technological experimental research on the change law of the bolt pre-tightening force under the influence of the rabbet,this paper has carried out the theoretical analysis and process test research on the change rule of bolt pre-tightening force under the influence of rabbet structure.The quali-tative analysis of the pre-tightening force change rule under the influence of the rabbet structure is established,the theoretical model of the bolt pre-tightening force change under the influence of the rabbet structure is established,and the bolt connection test piece with 24 bolts and the bolt-rabbet connection test are carried out.The test results show that after the hot-fitting process is completed,the rabbet structure will produce a"pry force"effect on the upper connector,causing uneven gaps in the connection in-terface.In this case,the input torque needs to overcome the"prying force"exerted by the rabbet on the upper connector first,and the input energy will be lost,resulting in a decrease in the average pre-tightening force;the existence of the rabbet structure will reduce the dispersion of the pre-tightening force of the bolt group at the same time.In response to this phenomenon,a pressure plate was designed and a pressure equalization process was proposed.The test results show that tightening the bolt group after the pressure equalization process can not only offset the influence of the"pry force"of the stop structure,increase the average pre-tightening force of the bolt group,but also make the pre-tightening force of the bolt group dispersible reduce and improve assem-bly quality.Relevant research results show that the process design of the bolt-rabbet connection structure has positive significance.
Bolt-Rabbet Connection StructureInterference FitFastening ProcessPressure Equalization Process
万方数据
维普
