Effects Of Manufacture And Assembly Errors On Mechanical Performance Of Cylindrical Roller Bearing

Bearings is key components that widely used in many kinds systems, its performance has a significant influence on the stable operation of the system, higher performance requirements is needed in many application field. Although bearing technology is in improving, but in the process of manufacturing and assembly, with the reason of the people and equipments, some kinds of errors will inevitable appear, the errors have certain influence on the performance stability. The purpose of this paper is to establish the finite element model that include manufacturing and assembly errors, get bearing stress distribution of each part and the influence of different errors on bearing performance, find out the weak area quickly in the serving process.Based on the cylindrical roller bearing for research object in this paper, introduces the structure characteristics of the bearing and its geometric relationships, elaborate the cylindrical roller bearing analysis related theory, including the Hertz line contact theory, contact stress and deformation calculation method based on the theory, load distribution when the clearance is zero and not zero. The above content provides theoretical basis for the cylindrical roller bearing a finite element model.The finite element model of cylindrical roller bearing under the action of radial load is established based on ABAQUS, get the stress distribution and deformation of the whole bearing, the analysis results is compared with the theoretical solution based on Hertz line contact theory to verify the feasibility of the model. Then set up model considering change of load, clearance, roller diameter, ring tilt change respectively. With radial load, clearance, roller diameter error, ring tilt for variables, analysis the effects of single variable on size and distribution of the bearing contact stress, the axial contact stress distribution, deformation and number of loaded rollers.Then analysis multiple variables combination effects on performance of the bearing. Based on the Response Surface Method(RSM) and Central Composite Design(CCD) principle to build the test plan. Using Design Expert software to deal with test data, set up RSM functions of the loaded rollers considering manufacturing and assembly errors respectively, Analysis contact stress change rule of the loaded rollers. Finally establish the RSM function of bearing maximum contact stress and deformation consider clearance, roller diameter error and ring tilt, through 3D response surface and its two-dimensional contour map analysis the influence law of interaction between two factors. According to the response surface function can predict the contact stress and deformation when the bearing have single or multiple errors.Through summarizing rule to get the reasonable range of errors to guide the production practice, at the same time provide beneficial guidance for the rolling bearing reliability optimization design considering the influences of various random errors.