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继1969年发展了硬质合金碳化钛涂层刀片之后,在国外又先后出现了第二代和第三代涂层刀片,它们较之一般刀片具有寿命长、切速
Following the development of tungsten carbide carbide coated inserts in 1969, second and third-generation coated inserts have appeared in foreign countries. They have longer life,