Study On Injection Molding Process Of Polymer Liner For Self-Lubricating Spherical Bearing

In the manufacturing technology of self-lubricating spherical bearings,the study of self-lubricating liner occupies a very important position.At present,self-lubricating liners are widely used in fabric-type liners,but they have the disadvantages of complicated manufacturing process,high cost,low production efficiency,and the quality of self-lubricating liners is greatly affected by the manufacturing process.Therefore,it is imperative to study a new type of self-lubricating material with lower economic cost and better overall performance.PEEK plastic is a self-lubricating polymer polymer material with good stability and mechanical properties.By injection molding technology,PEEK plastic is applied to the friction pairs.In this paper,polyether ether ketone(PEEK),which has excellent comprehensive properties,is used as a self lubricating liner material,and a self lubricating liner for injection molding polymer is studied.This paper takes radial self-lubricating spherical bearings as the research object and studies its self-lubricating polymer liners.According to the feature that this polymer self-lubricating liners needs to be injected directly into the gap between the inner and outer rings of the spherical bearing,the core part of the mold,that is,the mold core,and the structure of other mold systems are designed.The overall structure of the mold is a two-cavity and two-plate vertical injection mold.This mold structure can effectively improve the positioning accuracy of the inner and outer rings of the fixed bearing and improve the injection quality of the polymer self-lubricating liners.Then,in order to analyze the effectiveness and quality of the injection process,Moldflow was used to do numerical simulation for the designed,and the filling analysis,cooling analysis and warpage of the injection process were simulated and analyzed,as well as defect prediction research.Then,the influence of quality was analyzed by the orthogonal test method.The shrinkage and warpage of polymer self-lubricant liners were used as test targets.Through range analysis and variance analysis methods,the influence of injection molding process parameters on the two optimization indexes was explored,and the mold was optimized based on the simulation results..Finally,using the comprehensive balance method to obtain a set of optimal process parameters that meet the global requirements: the mold filling time is 0.25 s,the mold temperature is 189°C,the holding pressure time is 16 s,the melt temperature is 395°C,and the holding pressure is 110 Mpa and the cooling time is 10 s.At this time,the shrinkage and warpage deformation of the injection-molded liners were respectively 2.007% and 0.0272 mm.Finally,in order to improve the adhesion between the injection liner and the spherical surface of the spherical bearing outer ring,the surface treatment process of the liner bonding surface was investigated.The processing method is to make the surface texture and slotting method on the stainless steel plate to coarsening the metal surface,so as to increase the bonding surface area of the plastic,and then achieve the goal of improving the cohesive force.The idea of using the modified PEEK material as a self-lubricating spherical bearing liner and the analysis of the injection molding process provide important reference value for the further study of the high-performance plastic self-lubricant liner and its injection molding process,in order to further improve self-lubricating.Liner performance and reduce manufacturing costs are of great significance.