Development Of Bonding Assembly Technology And Equipment For Radome

The radome is a key component of high speed aircraft,and its assembly accuracy directly affects the flying ability of the aircraft.The head cone and connecting ring of the radome are connected and assembled by glue.The traditional assembly adopts manual adjustment to assemble the head cone and connecting ring,which has low assembly accuracy,poor consistency and low efficiency.In this paper,according to the assembly requirements of radome cone and connecting ring,the key technologies of coaxial positioning assembly and assembly accuracy in-situ measurement of cone and connecting ring are broken through,and the special equipment is developed.The main contents are as follows :(1)For the bonding assembly and measurement requirements of the radome,the technical parameters of the radome bonding equipment are proposed.By comparing the characteristics of horizontal assembly and vertical assembly,a dual-station vertical bonding method is proposed,and a removable box frame is used.Two assembly stations share a set of measurement systems.The structure and motion scheme of the bonding equipment are formulated,and the radome bonding assembly and radial runout measurement are integrated in the equipment.The specific process of radome bonding assembly was designed to provide guidance for the specific structural design of bonding equipment.(2)According to the coaxial assembly requirements of the cone and the connecting ring,the positioning clamping method of the cone and the connecting ring and the motion scheme of the positioning unit are proposed,and the structure design of the cone positioning unit and the connecting ring positioning unit is carried out.The two positioning units are installed on the same central axis,realizing the unity of reference and improving the coaxiality of the two assembly.Aiming at the measurement requirements of radial jump at specific sections of radome,the triangle method and white light confocal method are compared and analyzed.The fiber coaxial displacement sensor is selected,the structure and motion scheme of the measurement unit are formulated,and the realization method of radial jump measurement at different sections of radome is proposed.Focusing on the problem that the positioning surface of the cone is easy to wear and thus affects the positioning accuracy,the structure scheme of the grinding unit and the grinding method of different positions and different positioning components are proposed to realize the online dressing of the positioning surface.(3)In order to ensure the bonding quality,the positioning unit accuracy is tested.Through the grinding of the positioning plate and the positioning head,the maximum radial jump of the positioning unit is 0.047 mm,which meets the requirements of the index.The influencing factors of radial runout measurement error reflecting the assembly error of radome are analyzed,and it is concluded that the radial runout measurement error is positively correlated with the height of measured section and the angle ? between the central axis of radome and the rotation center line.The influence law of sensor incident angle on measurement error is obtained through experiments: when the sensor incident angle is less than 81°,the measurement error is small.The radome assembly and measurement tests were carried out.The results show that the maximum radial runout of the radome section B is 0.211 mm,and the maximum radial runout of the radome section C is 0.128 mm after bonding.All meet the index requirements.In this paper,a bonding assembly process and method are designed for the bonding assembly requirements in the actual production of radome,and a special equipment is developed.Through testing,it is confirmed that this equipment can meet the production needs of radome.