Improving reliability of parts of mounted mower according to monitoring results by fatigue gauges from tin foil
2019
Tyutrin, S., Kurgan State Univ., (Russian Federation)
Problems of increase of reliability and reduction of idle time of agricultural machinery are considered. To prevent fatigue failure of the most loaded parts, it is proposed to monitor them using fatigue gauges made of tin foil. Such gauges have low cost and quickly react to relatively low stresses. Fatigue gauges made of tin foil can be visually monitored using a microscope at magnification of 100 or less. Results of reliability improvement of parts of a mounted mower “KC-2,1” according to the monitoring data by fatigue gauges from tin foil are described. These results are: durability-increasing technology of the knife head of the mower; technology of the connecting rod strength increasing. The probability of non-destruction of the knife head increased to 99.5 %. The assurance factor of the connecting rod after repair was increased by 2.6 times. The technology of using tin foil as a fatigue gauge for measuring cyclic stresses is described. The scheme of the stand for calibration tests of fatigue gauges is presented. A low-cost method of carrying out calibration tests is described. The calibration specimen is shown. The calibration curve of the fatigue gauge and photos of its surface during the inspection are presented. It is noted that the sensitivity of fatigue gauges made of tin foil is much higher than that of fatigue gauges made of copper or aluminium. Tin foil fatigue gauges are effective helpers in improving the profitability of agricultural production and attractiveness of rural areas.
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