The Finite Element Numerical Simulation On Composite Mechanism Of The Cross Wedge Rolling 42CrMo/Q235 Composite Shaft

Shaft parts are usually equipped in high temperatue?high pressure and other harsh environment,and are prone to cause the shaft to wear or fracture,which can bring danger to equivenments and workers.Meanwhile,In order to solve the waste of high-quality?precious metal parts and the difficulty to achieve lightweight,satisfying the goal of shaft working in the complex environment and reducing the costs,other papers present the method of cross wedge rolling laminated shaft of dissimilar materials.But,the key to the use of dissimilar materials laminated shaft is whether the interface has a high bonding strength,that is,the formation of effective bonding.Therefore,in this paper,the interface of the laminated shaft was taken as the research object,and the influence of the process parameters on the stress and strain was analyzed.Finally,the interface bonding mechanism of cross wedge rolling was obtained.There is a great difference between deformation resistance of each layer material.Affected by the inherent deformation characteristics of cross wedge rolling,covering and base material's radial compression are difficult to distribute uniformly.The thickness-radius ratio of laminated shaft is directly related to the relationship between the thickness of the clad material and radius of the matrix material,which is the premise of ensuring the mechanical properties and reducing the cost.At present,thickness-radius ratio has been discussed in part,but there is no effective theoretical support,so this paper made a deep research on it.By using ANSYS/LS-DYNA software,the finite element model of cross wedge rolling of laminated shafts was established.Some thickness-radius ratio rolling experiments were carried out under the orthogonal experimental designed with four factors and three levels.Through finite element simulation,the effect of process parameters on thickness-radius ratio were analyzed.The results show that the rolling experimental results accord with the simulation results,which shows that finite element model can be used to predict thickness-radius ratio and the influencing sequence on the thickness-radius ratio.Selecting the matrix material element and clad material element of the cross section on the interface,the effect of process parameters on the radial stress?transverse stress?axial stress?maximum shear stress and maximum shear strain which has a great influence on the interface bonding were analyzed,and the corresponding influence sequence of stress and strain was also got.At the same time,the control of interfacial bonding by rolling temperature and area reduction is preferred.Then,according to the influence sequence of stress,choosing the continuous nodes of the longitudinal section,the effect of the coupling between the stress on the interface bonding was got,and when the radial stress and axial stress are larger,the transverse stress and shear stress are in a certain range,the interface is easier to form a combination.Combining the FE simulation analysis and experiments,the influence law of interface bonding process of cross wedge rolling laminated shaft was analyzed,which has laid an important foundation for the selection of die and the wide application of the crossing wedge rolling laminated shaft.