Стоимость материала для зубчатых колес массового производства обычно составляет 50 — 55% общей стоимости зубчатого колеса. Во многих случаях экономически целесообразнее изготовлять зубчатые колеса из высококачественных легированных сталей, повышая их срок службы и надежность в эксплуатации. Значительно реже для зубчатых колес используются серый чугун, пластмассы, слоистые пластики и металлокерамические материалы. Из серого чугуна изготовляются зубчатые колеса, работающие при малых окружных скоростях и передающие небольшие усилия. Зубчатые колеса из таких пластиков, как текстолит, нейлон и другие, работающие при высоких окружных скоростях (40 — 50 м/с), отличаются низким уровнем шума при работе, плавностью передачи и способностью гасить вибрации. При этом они входят в зацепление с зубчатыми колесами, изготовленными из стали или твердого чугуна. В качестве материала для конических зубчатых колес применяются углеродистые закаливаемые стали 40, 45, цементируемые — сталь 15, сталь 20, легированные закаливаемые — 40 X, легированные цементируемые — 20 X, хромоникелевые — 12 ХНЗА; 20 ХН; 40 ХН, хромомарганцовйстые — 18 ХГ, хромомарганцовистые с титаном — 18 ХҐТ, 25 ХГТ, 30 ХГТ, хромомолибденовые — 20 ХМ, хромоалюминиевые с молибденом — 38 ХМЮА, хромони- кельмолибденовые — 18 Х2Н4МА и др. В автоматических линиях, предназначенных для обработки зубчатых колес, применяются серийные станки, в которых специально предусмотрена автоматическая загрузка заготовок или возможность ее осуществления. Почти все станки можно быстро переналадить на обработку однотипных деталей. Если вам нужен шланг, то изготовить шланг рвд смогут для вас тут. Для всех линий характерно удобное для эксплуатации расположение оборудования. Увеличение площадей и связанное с этим некоторое повышение амортизационных расходов окупаются ростом производительности, удобством технического обслуживания и ремонта. Рассмотрим схему технологического процесса обработки зубчатых ко- 236 лес первой передачи легкового автомобиля.
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