Abstract:The static calculation and modal analyses of the frame plate of a hammer feed grinder rotor system were performed with ANSYS Workbench software. The results showed that under the actual working conditions,the maximum total deformation of the frame plate was 0.035 mm,occurrin at the mounting holes of the two pin rolls with eight hammers on the intermediate support plate, and the maximum deformation of the frame plate along the X axis Y axis and Z axis was 0.035 mm,0.001 mm and 0.016 mm,respectively. All deformations were small and consistent with the actual load condition of the frame plate. The maximum stress on the frame plate was 165.72 MPa,and the parts with large stress were only concentrated near the mounting holes of the two pin rolls with eight hammers on the intermediate support plate. The stress values at most other positions on the frame plate were below 36.862 MPa. The firstorder natural frequency of the frame plate was 339.79 Hz,and its first six order natural frequencies are much higher than the excitation frequency of the hammer feed grinder calculated as 58.33 Hz. But there is a serious material redundancy problem. Based on this,the topology optimization of the frame plate was conducted. The frame plate structure was optimized on the basis of calculating material removal rate as 50%. The quality of the new frame plate was reduced from the initial 46.66 kg to 25.85 kg after optimization. The results of static calculation and modal analyses of the optimized frame plate showed that both the strength and stiffness of the new frame plate were sufficient,and its material redundancy was greatly reduced. The frame plate did not resonate during the working process. It is indicated that the optimized design of the frame plate has desirable effects.