基于反变形的发动机缸体止推面垂直度补偿控制方法OA

The engine cylinder block requires extremely high stability and precision in machining and assembly.The perpendicularity of the engine cylinder block thrust surfaces is an important index to evaluate the machining and assembly quality of the cylinder block.However,in the actual process of machining and assembly,due to the influence of various factors,the out-of-tolerance problem often occurs in the perpendicularity of cylinder block thrust surfaces.Therefore,an anti-deformation compensation control method to solve the problem of out-of-tolerance perpendicularity of engine cylinder block thrust surfaces is proposed.Firstly,a finite element model of the cylinder block and bearing cover after fastening was established,and the bolt tightening torque was identified as the main factor causing the deformation and out-of-tolerance perpendicularity of the thrust surface.Then,based on the three-coordinate measurement data of the thrust surface,the accuracy of the finite element model was verified,and an anti-deformation compensation machining method for the cylinder block thrust surface was proposed according to the bolt tightening torque-thrust surface deformation law.Finally,the feasibility of the compensation machining method was verified through the coordinate measurement data of the thrust surface in the actual machining and assembly experiment.In actual batch processing,the eccentric pin could be used instead of the traditional positioning method of"one side and two pins"to achieve the anti-deformation compensation machining of thrust surfaces.The result showed that the perpendicularity error of the engine cylinder block thrust surface after compensation was reduced by more than 78%compared with that before compensation,which proved the effectiveness of the proposed method.The research results provide a feasible solution for the machining deformation problem in precision manufacturing.