ПРОЕКТИРОВАНИЕ КАЛИБРА-СКОБЫ ДЛЯ КОНТРОЛЯ ДИАМЕТРА ПРОМЕЖУТОЧНОГО ВАЛА ПРИ РЕМОНТЕ ДВИГАТЕЛЕЙ ЗМЗ

Abstract

Two goals can be achieved in repair production when controlling linear dimensions, depending on the task at hand. First, measurement is taken to determine the size of the controlled part in absolute terms. Then, the size of the controlled part is determined within the prescribed maximum deviations. According to the measurement results, the part is classifi ed as suitable or rejected. The second goal is achieved with the help of calibers, which signifi cantly increases the speed and reduces the labor intensity of control. But standard gauges are not available for repair dimensions and tolerances, so an individual approach is required. The authors off er a snap-gauge project including staples for serial repair production to control the diameter of the front journal of the countershaft of ZMZ engines during repairs. The technology includes grinding for a sleeve of the repair size and ensuring the quality of fi t in the joint of 48.8 mm. The tolerance for the production of the go and no-go sides equals 7 microns. To provide a margin for wear, the shift into the tolerance fi eld by the go side of the snap-gauge should amount to 6 microns. The calculated limiting wear value equals +5 microns. To control the dimensions of the working snap-gauge during operation, it is necessary to use a control gauge. The authors determined the tolerance for the dimensions of the control gauge that equals 2.5 microns and established the limiting dimensions of the gauge. Taking into account the obtained values, the authors have constructed a diagram of the tolerance fi elds of the snap-gauge for controlling the shaft size of 48.8 mm with upper and lower deviations of –0.041 mm and –0.016 mm, respectively, and made a sketch of the developed measuring instrument.