DETERMINANTS OF QUALITY CONTROL ACCURACY OF AUTOMATED MEASURING DEVICE FOR SPARE PARTS OF AGRICULTURAL MACHINERY

Abstract

The paper is devoted to the improvement of methods and means of ling physicomechanical and geometrical parameters of spare parts at technical service enterprises. As an experimental installation, an automated measuring device has been developed to control physical-and-mechanical and geometric parameters of spare parts. The author has determined the most significant factors influencing the control accuracy of automated devices: light radiation intensity, the distance from the radiation source to the monitored spare part, the external environment temperature. Basing on the study results of the effect of these factors, it has been determined that the optimum value of the distance between the measuring instrument (the Riftek RF 620 laser scanner) and the monitored object should be equal to 115 ... 135 mm, the probability of measurement error being less than 5%. Basing on the study results, the author has stated that the optimal value of the distance between the measuring tool and the monitored object is the first 34% of the working range of a triangulation laser scanner, the optimum power of a scanner is 1.5 mW, the temperature mode of the device ranging from -10 ° C. +40 ° C. Spare parts (shafts, gears, axle shafts) of the front driving axle of the MTZ 82 tractor have been examined by means of an automated measuring device. The checking results of the parameters of spare parts have revealed that 10% of the gear parts do not correspond to the diameter required for a roller bearing, 7.5% of shafts and 15% of axle-shfts and gears do not correspond to the required mass value, which indicates a mismatch between physical and mechanical properties of the material. Thus the expediency of using an automated measuring device has been experimentally confirmed, which allows controlling the quality of spare parts.