防松胶对螺纹连接预紧力影响试验研究

摘要

Screwjointstructureisabasicdevicemostlyusedinspaceopticalremotesensorassemblybecauseofits outstanding advantages.Choosing the fitting fasteners and controlling the preload is the key to ensure the reliability of the screw joint structure.Plastering the locking adhesive on the screw thread during the course of assembling is a mean mostly used to prevent the screw joint get loose nowadays.But in the course of engineering application,the preload will change dramatically after plastering the locking adhesive on the screw threads or plastering different locking adhesive,although under the same locking torque.The quantified influence of the frequently-used locking adhesive in optical remote sensor assembling was analysed.The experiment results indicate that plastering the silastic(D04(L))on the screw thread in the assembling,the preload will decrease by 50%~70% by comparison with the case of no locking adhesive under the same torque.But plastering the anaerobic adhesive(LOTTIE243),the preload will increase by 46%~98%.According to the study results,the influence to the preload has to be tested before using this kind of locking adhesive,and the torque should be adjusted according to the test results.The fastening by the torque spanner is unfit for the connection where the preload should be accurately controlled.%鉴于螺纹在涂胶前后或涂不同种类防松胶、施加相同拧紧力矩时产生的螺栓预紧力差别较大，对空间光学遥感器装配中常用防松胶对螺纹连接预紧力影响进行定量试验研究，结果表明，在螺纹上涂硅橡胶D04（L）与不涂胶相比，相同拧紧力矩时螺栓预紧力减小50％～70％；涂厌氧胶乐泰243、相同拧紧力矩时螺栓预紧力增大46％～98％。某类防松胶使用前需对其对螺纹连接预紧力影响进行定量测试，据测试结果调整螺栓的拧紧力矩达到预期预紧力；在对预紧力精确控制的连接区域，力矩扳手紧固方式不再适用。