The Process Engineering Analysis And Numerical Simulation On Precision Of Hub Bearing Unit

The hub bearing is a key part in cars.Its' main function is to sustain the weight of the cars and to offer precision guiding for hub driving.With the popularity of the front-wheel drive vehicles,the bearings and other components of the integrated technology has been rapidly developed.In order to meet the needs to reduce weight, decrease the size and installation requirements,it is gradually replaced by hub bearing units.The theme is based on this situation.In order to come up with the rapid development of hub bearing,we put forward a precision closed-die forging new technology that can effectively improve material utilization and production costs.Based on the hot die forging theory,we analyze the structure of the third hub bearing units,and then design a reasonable precision forging process and make different forging project.Then we design the three-dimensional model of the DOE-31152 hub bearing units and optimize the design process.In this paper,through adopting rigid-visco plastic finite element method(FEM) and using American advanced software DEFORM.Through FEM simulation,the wed thickness of pre-forging pieces,the structure of die and the size of billet are optimized,we studied the preheating temperature and lubrication conditions on forming load and attained the aim of optimize technology parameter,the structure of die and avoid defect.So the rule of metal flow and the distribution of effective stress,strain and temperature field can be obtained,as well as the stroke-load curve.The technology of forging,FEM simulation and mould CAD are integrated through this research.It helps to shorten developing period,improve life of die,and cut down the cost,etc.The achievements of the research can provide accordance for other hub bearings' producing and be used to guide producing directly.