Study On The Processing Technology Of Self-lubricating Joint Bearing Assembly Of Aero-engine

Maintenance-free knuckle bearings are widely applied in the advanced aircraft engines at home and abroad,especially those in the engines which are difficult to maintain.The manufacturing standard of oversea is more perfect of knuckle bearing,but it is rarely announced because of technical secret.However domestic study on knuckle bearing of the parts processing is not carried out in-depth and the parts by self production in the engine often become flexible and even fall off after long-term work.This often lead to the breakdown of the engine so that import is the main way,which situation seriously restrict the development of the field of domestic engine,therefore it has a significant value to study the manufacturing technology and product standards of maintenance-free knuckle bearing of aircraft engine.In the article,it studies the CNC machining,honing processing,fixture design,secondary static flanging and bearing force detection as the theoretical foundation of improving the whole process which include the processing,assembly and flanging of aero engine self-lubricating bearing,so as to standardize the methods of processing,assembly,flanging,inspection and other technical requirements.First,the clamping deformation of the part is controlled by machining accuracy of the cylindricity of the inner hole,chamfering and thickness dimension of the mounting plane,so as to ensure that the part size satisfies the requirements of assembly and flanging.Second,by the analysis of the processing capacity,it can get the machining method of process to link that is end plane grinding and hole honing.Third,by designing and manufacturing to self-centering assembly and flanging die,the positioning assembly and the flanging process are accurate and made the flanging uniform and it can withstand the axial load without prolapse after flanging and the assembly can rotate flexibly.Fourth,through quality tools-Minitab software,it can apply the measurement system of evaluation to ensure the reliability of the whole measurement system.Fifth,the accumulation of data through the test has built a series of standard the formation of the allowable pressure after fixed bearing axial force,bearing swing and rotation flexibility torque value standard and bearing outer ring fixed displacement check load value.Finally,by the simulation of engine state,more than 25 thousand times swing cycle have been tested to ensure reliability of the assembly in the work phase.Through the study and practice to knuckle bearing,it masters not only the processing technology,the assembly and flanging technology,the rotational torque of the bearing and detection technology of the stripping force but also improving the process,the design parameters of parts and the optimized quantization of parts inspection standard to make self-lubricating knuckle bearing reach the standard of imported and effectively to prevent the bearing loosening or dislocation.Meanwhile the technology has been realized parts batch production and to meet the performance of the engine.Most important of all,the self-lubricating knuckle bearing manufacturing technology of the engine is no longer blank in the domestic industry.