Study on the evaluation of stress relieving effect of cast iron parts by using the variation of intrinsic frequency
In order to simplify the evaluation process of the stress relief effect of iron castings,the natu-ral frequency,residual stress and the relationship between the natural frequency and residual stress of iron castings were studied from three perspectives:theoretical derivation,virtual simulation and specimen testing.Firstly,the theoretical formula of the relationship between the natural frequency and the residual stress of the beam castings of equal cross-section is derived.Secondly,ANSYS and ProCAST software were used to analyze the finite element mode and casting residual stress of the carding machine cover respectively.Thirdly,a group of carding machine cover specimens with different stress states were deter-mined by experimental modal analysis and X-ray diffraction stress measurement method.Finally,the theoretical formula of calculating the residual stress reduction of iron castings by natural frequency is derived,and the experimental data are fitted by linear least squares.The results show that the residual stress of the iron castings with equal cross-section beam is linearly related to the square of the natural frequency of the first-order bending,and the stress relief effect of the castings can be evaluated by us-ing this linear relationship.
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