Research On Oil-Film Bearing Performance Based On Bench Test

The oil-film bearing is a key equipment that has very high requirements for machining accuracy and assembly accuracy.Its bearing capacity and stable operation have a very important influence on the rolling accuracy of the rolling mill and the quality of the products produced.With the increase in production demand of enterprises,there are higher requirements for oil-film bearings in both design and manufacturing and practical application.As can be seen from the bushes returned to the factory for repair,the main failure modes of oil-film bearings are mainly the wear and scratches of the bushes.Such failure modes will greatly reduce the service life of the bearings,thereby giving enterprises Severe economic losses.Before the bearing is put into use,the best way is to carry out the bench test under different working conditions on the basis of the existing test bed.According to its ultimate bearing capacity and operating stability,it reflects the suitable operating conditions of this type of bearing.To avoid bearing failure accidents caused by the inconsistency of actual working conditions.To solve this kind of problem,first of all,it is necessary to formulate the operating conditions of the bearing.According to the ultimate bearing capacity of the test bearing under different operating conditions and the temperature change of the oil film,improvement measures are given from different aspects in order to increase the stable operation time of the oil film bearing.Extending its service life has certain guiding significance for enterprises using this type of bearing.Based on the oil film bearing test stand of a large rolling mill and the copper alloy material oil film bearings used by a large domestic company as the research object,the following research contents are described as follows:First of all,according to the different application occasions and characteristics of the copper alloy bushing,the selection of the copper alloy bushing grade was completed,and powder metallurgy was selected as the molding process;the layout of the bearing sensor was designed,and the corresponding processing and assembly were completed.;Calibrated all kinds of sensors before installation,and used the Siemens module to display the collected data on the pc side;Secondly,using the powerful numerical calculation capabilities of MATLAB software,the distribution of oil film pressure and oil film thickness at different speeds is obtained.In the axial direction,the oil film pressure and film thickness are symmetrically distributed;in the circumferential direction,the oil film pressure appears at a certain angle of wrap Within range.As the rotation speed increases,the oil film pressure increases,and the film thickness at the corresponding location becomes smaller,that is,the film thickness is the smallest at the maximum oil film pressure,and the temperature is the highest at that location.Finally,based on the bench test results,the effects of the copper alloy bushing's compactness and surface morphology on the bearing capacity were analyzed;the bearing inlet oil temperature,that is,the viscosity of the lubricating oil,was analyzed on the bearing capacity;the number of pressure holes on the bearing was analyzed The influence of load;and according to the comparison of test temperature under different working conditions,the influence of speed,load and eccentric load on the bearing is analyzed.The results show that the denseness of the bushing surface brought by the powder metallurgy process is very important for bearing load.The higher the density,the lower the bushing roughness value and the higher the bearing capacity;the higher the inlet oil temperature,the lubricating oil viscosity value The smaller the load capacity,the lower the load capacity;the greater the number of pressure holes in the load area,the more difficult it is to form an oil film,and the lower the load capacity.