Assembly interface accuracy prediction model considering stress release

Due to the effects of vibration, shock and alternating loads, uneven stress release and stress redistribution occur in the large bolt connection structure of the machine tool. This will lead to deformation of the assembly structure under the combined action of assembly stress and residual stress. This will result in a decline in the assembly performance of the bolt connection structure. This paper proposes a prediction model for the connection state of the machine tool bed- guideway assembly interface considering stress release, and obtains the interface accuracy and stiffness losses caused by stress release. The installation base plane of the bed- guideway is simplified as a beam model, and the coupling relationship between assembly stress and residual stress is considered, obtaining the evolution law of the force balance system caused by stress release, and finally, the deflection deformation curve of the base plane in the time domain is obtained through the stress release law. This method will provide new methods and ideas for the accuracy prediction of the assembly interface.