The Static Force And Flow Field Analysis Of Hydrodynamic Oil Film Bearings Applied On The Large Mfchanicat Press And Lubrication Tests

Mechanical presses, which have high production efficiency and high formingprecision, are advanced forming equipments. As the key parts of large mechanical presses,the hydrodynamic oil film bearings are very important. Their reasonable designs are keytechnologys which ensure that the mechanical presses operate reliably and reducemaintenance. At present, the researches on hydrodynamic oil film bearings with low speedand heavy load are generally limited to the rolling mill. Compared to their applications inthe actual production, researches on hydrodynamic oil film bearings applied onmechanical presses are much fewer. Researches in this area have important practicalsignificance for improving the design and manufacture of presses, extending the servicelife, and reducing repairs.The stress and the deformation of the hydrodynamic oil film bearings applied on2500 tons large transfer press made by“Qier Machine Tool Group Company”are analyzed,and the strength and stiffness are evaluated. The pressure and temperature distributions ofthe oil film are simulated to assess the operation of the bearing. At last, some tests aretaken to verify the correctness of the oil film temperature simulation.The main parts of 2500 tons transfer press are introduced and the main structuremodel is established. The finite element static analysis of the main structure is done to getthe stress and deformation distributions of each bearing with the press under uniform loadand partial load. Through the analysis, the strength and stiffness of each bearing meetrequirements. The tilt of each eccentric shaft is about 0.11mm, and the precisions ofbearings are better. Changing the thickness of bearings has little effect on the strength,stiffness, and support accuracy of bearings. Opening tanks on bearings at the reverseposition of the load has no influence on the strength and stiffness of bearings.The oil film flow field of hydrodynamic oil film bearing applied on 2500 tonstransfer press is simulated to obtain the pressure distribution and temperature distribution.The maximum of oil film pressure is 98.3MPa, the maximum of oil film temperature is57.2℃, and the bearing operates well. The influences of the speed, the relative gap, and outside oil pressure on the pressure distribution, temperature distribution, and bearingcapacity are analyzed.Based on the similarity theory, the test bearing is determined, and is simulated. Thetest bearing is tested to measure the temperature. The simulation and experimental resultscoincide and indirectly verify the credibility of the temperature simulation analysis of theoil film bearing applied on the transfer press.