METHOD AND DEVICE FOR EVALUATING SURFACE ROUGHNESS, BLAST PROCESSING METHOD AND BLAST PROCESSING AND CONTROLLING DEVICE

摘要

PURPOSE: To evaluate the surface roughness stricly by actually measuring the treated surface after treating, obtaining the distance and the height, performing Fourier transformation for the values, and converting the values into the relationship of the frequency between analysis of the frequency and power spectrum. ;CONSTITUTION: The treated surface of a product to be treated (e.g, the bore of an engine block) after blast treatment is actually measured based on the input signal from a CCD sensor, and the surface waveform of the distance and the height is obtained. The surface waveform undergoes Fourier transformation with the converting means of a microcomputer, and the waveform is converted into the relationship of frequency analysis of the frequency and the power spectrum. In this realtionship of the frequency analysis, the amplitude obtained by the substitution of the height of the surface waveform appears as the magnitude of the power spectrum. The period obtained by the substitution of the distance appears as the amount of variation of the power spectrum. The waviness of the irregularities is expressed together with the heights of the irregularities of the treated surface. Therefore, the surface roughness can be strictly evaluated when the surface roughness of the treated surface is evaluated based on the relationship of the frequency analysis.;COPYRIGHT: (C)1995,JPO