Realization Of Dimension Measurement Technology Of Special-shaped Shaft Parts Based On Line Laser Scanning

In the process of intelligent manufacturing of mechanical parts,with the use of industrial robots or special equipment,the loading and unloading of parts has realized automation and even intelligence;All kinds of high-grade CNC machine tools,parts of the processing process is more and more concentrated.And the quality of parts has become a weak link,mass production of parts dimensional accuracy and shape tolerance detection,still rely on a variety of gauge blocks.Special-shaped shaft parts are mass-produced and key parts with complex structure.In the process of intelligent manufacturing and transformation,full-size automation and digital detection of parts are expected to be realized.It is difficult to carry out the full-size inspection of special-shaped shaft directly through the analysis of the inspection demand of this part.In this paper,according to the typical characteristics of special-shaped shaft parts,a test piece is constructed.Based on the line laser scanning technology,the full-size detection method and technology of shaft parts are studied.The main contents are as follows:The shape characteristics and detection elements of special-shaped shaft parts were analyzed,the typical detection elements were extracted,and the test pieces were constructed to study the full-size detection method of such parts.A collection scheme of line laser scanning point cloud with process Angle setting was designed,and a laser scanning-vision inspection platform was built for measuring special-shaped shaft parts,and software was developed.The assembly deviation of process Angle and line laser milometer and the size characteristics of special-shaped shaft were analyzed,and a calibration method based on cylindrical standard was designed.The deviation data in the experiment was basically in the range of-0.007 mm to 0.006 mm,measurement accuracy of the test parts meets the requirements.Analyze the structural characteristics and data characteristics of the test parts,radius filtering and SOR filtering was designed.The grid side length and filter threshold coefficient are analyzed and optimized.The peak difference of length and diameter is 0.006 mm and0.005 mm respectively,which meet the detection requirements and verify the effectiveness of the maltreatment method.Finally,the corresponding measurement method was designed according to the waiting measurement characteristics of axial section diameter,length,coaxial,contour size of feature hole,feature bevel Angle and bottom groove depth of the test piece,and the measurement and data extraction were carried out.The feasibility of the proposed method is verified by comparing the experimental data with the measurement results of the universal measuring instrument and the optical measuring instrument.This paper realizes the size detection of test parts,which can provide detection scheme and technical basis for the full size detection and research of special-shaped shaft parts.