Ultrasonic rolling strengthening parameter normalization method

Abstract

The invention provides a normalization method for ultrasonic rolling parameters. The normalization method comprises the following steps: determining a processing area of a sample; in the working range of the machining parameters, a plurality of ultrasonic rolling strengthening experiments are designed by utilizing the four machining parameters at different levels; establishing a model of the machining time of the machining area of the unit size; establishing a model of total energy obtained by a unit-size processing area in the ultrasonic rolling process; determining total energy G corresponding to each ultrasonic rolling strengthening experiment as a G factor; s5, the hardness, roughness and residual stress values of the samples machined by each ultrasonic rolling strengthening device under different G factors are obtained; and drawing an interaction diagram of roughness-G factor, hardness-G factor and residual stress-G factor of the material of the processed sample. According to the method, parameter normalization processing can be well carried out on the machining parameters of different ultrasonic rolling devices, and transverse machining effect comparison can be effectively carried out.

Description

technical field [0001] The invention relates to the technical field of surface strengthening, in particular to a method for normalizing ultrasonic rolling strengthening parameters. Background technique [0002] Surface mechanical treatment is to improve the fatigue life of materials by introducing deformation on the surface of materials, forming surface hardening layers and residual stress fields, etc. By introducing residual compressive stress, the "effective tensile stress" can be reduced, the crack growth threshold can be increased, and the fatigue strength can be improved. At the same time, ultrasonic surface strengthening technology can improve the surface hardness of mechanical components, reduce surface roughness, improve the surface microstructure, etc., thereby improving the fatigue performance and wear resistance of mechanical components, and broadening the application range of materials. There are many kinds of surface mechanical treatment, such as shot peening, ...

AI Technical Summary

Problems solved by technology

Therefore, using different ultrasonic surface strengthening equipment, even if the same processing parameters are used, that is, processing interval, feed speed, down force and number of rolling passes, the processing effect is also very different, and the drawbacks that cannot guarantee the same processing effect under the same parameters limit this. The optimal development of this process hinders the data accumulation of ultrasonic rolling strengthening process parameter experiments

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