Bulletin of Belgorod State Technological University named after. V. G. Shukhov Bulletin of Belgorod State Technological University named after. V. G. Shukhov Вестник Белгородского государственного технологического университета им. В.Г. Шухова 2071-7318 41693 10.34031/2071-7318-2021-6-1-82-94 Машиностроение и машиноведение Machine building and mechanical engineering Машиностроение и машиноведение SPECIFIC FEATURES OF THERMAL PROCESSES IN DOUBLE-SIDED FACE GRINDING MACHINES ОСОБЕННОСТИ ПРОТЕКАНИЯ ТЕПЛОВЫХ ПРОЦЕССОВ В ДВУСТОРОННИХ ТОРЦЕШЛИФОВАЛЬНЫХ СТАНКАХ Никитина И. П. Nikitina I. P. innanikitina@list.ru

кандидат технических наук;

candidate of technical sciences;

 Поляков А. Н. Polyakov A. N. anp_temos@mail.ru

доктор технических наук;

doctor of technical sciences;

 Оренбургский государственный университет Orenburg State University 6 1 82 94 https://zh-szf.ru/en/nauka/article/41693/view

В работе представлен анализ протекания тепловых процессов в несущей системе двустороннего торцешлифовального станка. Для анализа использовались экспериментальные данные по температурам и перемещениям, полученные при работе станка на холостом ходу, и при имитации процесса шлифования с помощью электронагревателей различной мощности. Выполненные исследования показали, что тепловые деформации двусторонних торцешлифовальных станков с дуговой траекторией подачи заготовок происходят в широком диапазоне как по величине, так и по направлению, и могут нарушать основное требование точной работы станка – симметричность условий обработки на обоих торцах заготовки. Из экспериментов была установлена абсолютная величина непараллельности шлифовальных кругов после трех часов работы, которая почти в два раза превысила величину снимаемого припуска. Анализ кинетических изменений деформаций несущей системы станка при работе под тепловой нагрузкой показал, что с ее прогревом взаимное положение кругов постепенно изменяется от состояния «внизу шире» до состояния «внизу уже». Это приводит к самопроизвольному изменению динамической настройки технологической системы и соответствующему изменению точности обработки. Изменения динамической настройки технологической системы с разной интенсивностью продолжаются в течение всего времени работы станка.

The paper presents an analysis of thermal processes in the bearing system of a double-sided face grinding machine. Experimental data on temperatures and displacements obtained when the machine is idling and when imitating the grinding process with the help of electric heaters of various powers are used for analysis. The performed studies have shown that thermal deformations of double-sided face grinding machines with an arc trajectory of workpiece feed occur in a wide range in magnitude and direction. It can violate the main requirement for the precise operation of the machine - the symmetry of processing conditions at both ends of the workpiece. From the experiments, the absolute value of the non-parallelism of the grinding wheels after three hours of operation is established; it is almost twice the value of the removed allowance. Analysis of the kinetic change in the deformations of the supporting system of the machine tool during operation under thermal load shows that as it warms up, the relative position of the grinding wheels gradually changes from the state "wider at the bottom" to the state "narrower below". This leads to a spontaneous change in the dynamic tuning of the technological system and a corresponding change in the processing accuracy. Changes in the dynamic tuning of the technological system with varying intensity continue throughout the entire operating time of the machine.

 торцешлифовальные станки тепловые деформации избыточные температуры тепловые перемещения face grinding machines thermal deformations excess temperatures thermal displacements

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