Зубчатый ход изготовляют с тем же модулем зубьев, что и обрабатываемое зубчатое колесо, но большего диаметра. Диаметр хона выбирается от 220 до 250 мм при активной ширине венца 25 мм. Число зубьев хона не 258 должно быть кратным числу зубьев обрабатываемого зубчатого колеса. Основные методы конических колес Для нарезания конических зубчатых колес с прямыми зубьями применяется зубострогание двумя резцами, зубофрезерование двумя дисковыми фрезами и протягивание круговой протяжкой. Зубострогание двумя резцами осуществляется в две операции: черновое и чистовое. Схема чистового нарезания прямозубых конических колес на специальном зубострогальном станке приведена на рис 8.23, а. Обрабатываемое зубчатое колесо 1, вращаясь, воспроизводит зацепление с зубьями воображаемого плоского венца 3, образованными режущими кромками движущихся резцов инструмента 2. В процессе резания резцы совершают возвратно-поступательное движение и одновременно перемещаются вверх в плоскости, касательной к поверхности внутреннего конуса.
По окончании обката обрабатываемое зубчатое колесо выходит из зацепления с инструментом и, возвращаясь в исходное положение, поворачивается для обработки следующего зуба. Точность обработки данным методом соответствует 8-й степени точности, а параметр шероховатости боковой поверхности Ra от 2,5 до 1,5 мкм. Зубчатые колеса с модулем более 3 мм необходимо обрабатывать за два прохода. Более высокой производительностью по сравнению с зубостроганием обладает метод зубофрезерования двумя дисковыми фрезами (рис. 8.23, б) вследствие применения многолезвийного инструмента, работающего на высоких скоростях резания. Каждая фреза 2, вращаясь вокруг своей оси, наклоненной к вертикальной плоскости под углом, близким к углу зацепления, обрабатывает одну сторону профиля зуба зубчатого колеса 1, при этом режущие зубья одной фрезы в процессе резания входят в промежутки между режущими зубьями другой фрезы.
Application 0.000 seconds (+0.000); 0.75 MB (+0.753) - afterLoad
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Application 0.032 seconds (+0.001); 4.03 MB (+0.112) - beforeRenderModule mod_virtuemart_cart (Корзина)
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1 × UPDATE automarket_sefurls
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1 × DELETE
FROM `automarket_session`