Cylinder Wall's Roundness Testing System Online And The Accuracy On Research

The operational environment of the inner cylinder wall's roundness measurement are very bad, and the detection requirement are very rigorous, appropriate solutions had not found out in current years. So, the study on this field have much value on enhancing the level of machinery automation on inner cylinder wall's measurement, increasing product quality, reducing cost and quickening production velocity.The laser triangle ranging is a kind of non-contact ranging technique which has high ranging precision and high speech, it has comprehensive application in industrial automatic production and other high-accuracy measuring fields. On the base of conventional non-contact laser triangle ranging principle, so as to adapt the feature of the cylinder which have high cylinder wall ,small inner cylinder wall, and high temperature, this paper makes an modified laser optical path, and the circular degree of inner cylinder wall can be conversed to be the spot measurement of inner cylinder wall, this program makes measurement to the all spots of the inner cylinder wall by the full scanning method, so as to realize the high precision and high-speed on-line measurement.This program does a maximum increase of high accuracy in the laser distance measuring instrument of modified laser optical path by the method of selecting the modified laser optical path and scheme, and the comparison of the measurement method. In addition, the technique of laser triangle ranging is very ripe at present, but many components are added in the laser distance measuring instrument of modified laser optical path, whose fixation and positioning in the laser triangle ranging method is a problem at present, and the positioning accuracy of the components have much affect to the results. So the study on positioning accuracy is the most important task in this paper, Using MATLAB for data simulation, the biggest impact part will be knownOther influence factors which can not eliminate can also impact the results, this paper resolves it by the technique of instrument calibrating. In addition, this paper choices position induction detector(PSD) to replace the charge-coupled device(CCD) traditional laser triangle ranging. The reasons why we choice PSD are because it have the superiority of low cost, easy operation, rapid measurement, and direct output faculae barycenter.