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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос: Рассчитать рациональные значения глубины резания t, подачи S0 и скорости резания v при различных видах лезвийной обработки поверхностей деталей из различных материалов. Вид лезвийной обработки: сверлить отверстие. Обрабатываемый материал: чугун СЧ 25, НВ 200. Длина заготовки L=150 мм. Шероховатость обработанной поверхности детали: Rz 80, Ra 3,2. Размеры обрабатываемой поверхности: диаметр отверстия D=20H11; длина отверстия L=100 мм; глубина резания t=2,5 мм.
Будем исходить из следующего определения термина "глубокое сверление":
С учётом того, что в нашем случае отношение диаметра отверстия к его глубине составляет L/D = 100/20 = 5, применять сверло специальной конструкции нет необходимости.
Для расчёта параметров режима резания используем нормативы [1]. Для более надёжного выполнения технологических требований, указанных в карте по выбору вариантов процесса обработки отверстия, считаем, что обработка ведётся при вращающейся заготовке на токарном станке.
По приложению 1 (с. 509), считая, что обработка отверстия ведётся без подрезки его дна, для D = 20 мм принимаем 18-й вариант, включающий один переход: рассверливание. В результате обеспечивается квалитет 13 и качество поверхности, соответствующее параметру Ra 80 - 40 мкм. Предусматриваем также дальнейшую обработку отверстия для достижения указанных в задании требований: черновое шлифование на внутришлифовальном станке и оставляем для этого припуск (на диаметр), равный 0,2 мм (см. табл. 5.1 здесь).
Диаметр обрабатываемого отверстия для рассверливания с учётом указанного выше припуска на шлифование составляет D = 20 - 0,2 = 19,8 (мм). Сверло выбираем по ГОСТ 2092 - 77 и принимаем D = 19,75 мм (тогда припуск на шлифование составит не 0,2 мм, а 0,25 мм (на диаметр)). Форма заточки сверла нормальная. Материал рабочей части сверла - Р6М5.
По карте 1 (с. 429) выбираем табличные значения параметров режима: sоT = 1,24 мм/об, vT = 18,0 м/мин, PоТ = 1351 Н, NT = 0,92 кВт. Рассчитываем техническую частоту вращения сверла, соответствующую табличной скорости:
Положим, что применяется токарно-винторезный станок 16К20 [2]. Мощность его привода главного движения составляет 11 кВт (для основного испольнения).
По карте 5 устанавливаем, что поправочные коэффициенты для подачи на оборот и скорости резания в нашем случае, т. е. при следующих условиях обработки: 1) твёрдость материала заготовки 200 HB; 2) отношение l/D = 5; 3) наличие охлаждения; 4) отношение фактического периода стойкости сверла к нормативному (60 мин.), равное 1; 5) марка материала инструмента Р6М5 равны 1. Поэтому нормативные значения подачи на оборот и технической частоты вращения шпинделя станка совпадают с табличными: so = soT, n = nT. По паспортным данным станка принимаем фактические значения подачи на оборот и технической частоты вращения шпинделя: soф = 1,25 мм/об (здравый смысл подсказывает, что превышением фактического значения над нормативным, равным 0,01 мм/об, можно пренебречь), nф = 250 мин-1. Соответственно, фактическая скорость резания составляет 250/290 [$183$] 18,0 [$8801$] 15,5 (м/мин). Итак, s[sub]o[/sub] = 1,25 мм/об, v = 15,5 м/мин.
Насколько принятые значения параметров режима резания являются "рациональными", судить не берусь, потому что непонятно, как это оценить. Можно, однако, утверждать, что они соответствуют использованным нормативам.
Литература 1. Общемашиностроительные нормативы режимов резания: Справочник: В 2-х т. Т. 1 / А. Д. Локтев, И. Ф. Гущин, В. А. Батуев и др. - М.: Машиностроение, 1991. - 640 с. 2. Токарно-винторезные станки модели 16К20, 16К20П, 16К20Г, 16К25. Руководство по эксплуатации 16К20.000.000.РЭ. - М.: НИИИМ, 1979. - 69 с.
С уважением.
Об авторе:
Facta loquuntur.
Неизвестный
27.11.2012, 18:10
общий
Здравствуйте. Для сверления отверстий в чугуне применяются сверла с рабочей частью из быстрорежущей стали или твердого сплава?
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