It is difficult to obtain the corresponding relationship between the extrusion amount and the strengthening effect of the press-fit bushing cold extrusion,and there are problems of uneven distribution of residual stress along the axial direction and uneven deformation of the hole wall.Therefore,the cold extrusion strengthening process of the press-fit bushing with large diameter lug hole was studied,a low-cost process improvement method with fixture was put forward,and the feasibility of the improved process was verified.Firstly,the finite element model of the cold extrusion reinforcement of the compression bushing was established,the cold extrusion strengthening of the ear hole was carried out,and the residual stress distribution law and the deformation law of the hole wall under different extrusion amounts were explored.Then,the finite element model was used to analyze the mapping relationship between the fatigue life of the ear piece and the extrusion amount.The reliability of the finite element model of the cold extrusion reinforced ear hole of the press-fit bushing was verified by the cold extrusion installation experiment of the compression bushing and the stress detection experiment of X-ray diffractometer.Finally,an improved cold extrusion strengthening process for press-fit bushings was proposed,and its effectiveness was verified by the finite element method.The research results show that the strengthening effect of cold extrusion is not positively correlated with the extrusion amount,but achieves a peak under a certain extrusion amount.The improved cold extrusion strengthening process of the press-fit bushing can improve the problem of uneven deformation of the ear hole and further improve the fatigue life of the ear hole.
关键词
压合衬套/冷挤压强化有限元模型/残余应力/变形均匀性控制/疲劳寿命分析/冷挤压强化工艺
Key words
press-fit bushing/finite element model of cold extrusion strengthening/residual stress/deformation uniformity control/fatigue life analysis/cold extrusion strengthening process
维普
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