Abstract
At enterprises of building materials, various large-scale technological equipment is used, which in the process of operation is subjected to various types of repair, requiring the use of appropriate equipment and technology. Mills used for grinding raw materials have flanged connections that are attached with precision and fastening bolts to ensure the tightness of the connection. The precision bolts of the flange connections perceive the entire load of the equipment; therefore, high quality requirements are imposed on the holes for them in the flanges. Precision holes must be machined according to technology that meets their requirements. This article presents a study of hole machining by countersinking, ensuring the accuracy of holes after drilling in shape and spatial deviation. The results of experiments related to the machining of holes using portable devices with a sliding spindle and a movable drilling head are given. The deviations of the holes, which are obtained after drilling on portable devices, are set out, and the dependence of the deviations on various factors, which is expressed in breaking down and leading away the hole axis, is established. The influence of technological heredity after drilling on the accuracy of the hole when countersinking is established. The dependences give the opportunity to predict the accuracy of holes machining using portable devices after drilling and after core drilling, to establish the actual depth of cut for core drilling taking into account the rigidity of the technological system and independent variables.
Highlights
At enterprises of building materials, various large-scale technological equipment is used, which in the process of operation is subjected to various types of repair, requiring the use of appropriate equipment and technology
The precision bolts of the flange connections perceive the entire load of the equipment; high quality requirements are imposed on the holes for them in the flanges
Precision holes must be machined according to technology that meets their requirements
Summary
Для переносных устройств с подвижной сверлильной головкой разбивку в поперечных сечениях после сверления yрi= y(x) можно определить по формуле [9]: 2019, No9 y(x). Где Pо – осевое усилие; P1 – вес подвижной сверлильной головки; d – диаметр режущего инструмента (сверла); l – длина вылета режущего инструмента до шпинделя; l1 – расстояние между опорами направляющих; x – переменная величина перемещения равная длине обработки, то есть толщине заготовки H, мм, изменяется от H к 0 Если в процессе сверления имеет место и разбивка отверстия, и увод сверла, то фактическую глубину резания в рассматриваемых поперечных сечениях отверстия можно определить по формуле: ti dз dс / 2 y0 yрi ,. Для установления технологической наследственности влияния сверления на точность и форму отверстия в продольном сечении при зенкеровании, рассчитывается погрешность yi от переменной глубины резания ti в нескольких поперечных сечениях по длине отверстия, количество которых принимается в зависимости от длины (глубины) отверстия. – назначить режущие инструменты (сверло, зенкер) с нужными размерами – диаметром и длиной рабочей части, и требуемой точностью
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