Abstract
In order to improve the fatigue life of axial piston motor, piston holes were strengthened by inner rolling strengthening process after precision machining. Based on the principle of surface rolling, finite element simulation models of inner rolling and fatigue were established to research mechanism of residual stress and fatigue cycle, respectively. We analyzed the distribution characteristics of residual stress in hole wall and studied the influence law of different rolling process parameters on residual stress. The fatigue life of workpiece with and without residual compressive stress was compared stress life simulation. The results show that the maximum residual compressive stress of 150~210 MPa can be generated after rolling strengthening. The fatigue life was increased by about 21.4% due to residual compressive stress.
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