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发明公开
CN103962590A 表面包覆切削工具及其制造方法 有权

表面包覆切削工具及其制造方法
摘要：
本发明提供表面包覆切削工具及其制造方法。在由WC基硬质合金构成的工具基体的表面蒸镀形成平均层厚为2～10μm的硬质包覆层的表面包覆切削工具，即(a)一种由Al、Ti及Si的复合氮化物层构成的硬质包覆层，该层中Al、Ti及Si的总量中所占的Ti的含有比例为0.3～0.5，Si的含有比例为0.01～0.1，上述含有比例均为原子比，(b)在自上述表面包覆切削工具的后刀面上的刀尖距离100μm的位置为止的范围内，硬质包覆层具有粒状结晶组织，且硬质包覆层表面的粒状晶粒的平均粒径为0.2～0.5μm，并且，工具基体与硬质包覆层的界面的粒状晶粒的平均粒径比硬质包覆层表面的粒状晶粒的平均粒径小0.02～0.1μm，并且，粒径为0.15μm以下的晶粒所占的晶体粒径长度比例为20%以下。
摘要（英）：

The invention provides a surface coated cutting tool and a method for manufacturing the same. A hard coating layer with an average thickness of 2 to 10 [mu]m is formed on the surface of a tool substrate made of WC base hard alloy through evaporation. (a) The hard coating layer is made of an Al and Ti composite nitride layer, wherein Ti accounts for 0.15 to 0.45 atom% and Si accounts for 0.01 to 0.1 atom% of the total amount of Al, Ti and Si. (b) In a range of 100 [mu]m away from the knife tip on a rear knife face of the surface coated cutting tool, the hard coating layer has a grain crystal tissue, wherein the average grain diameter of a grain cystal on the surface of the hard coating layer is 0.2 to 0.5 [mu]m; furthermore, the average grain diameter of a grain crystal on the interface of the tool substrate and the hard coating layer is smaller than that of the grain crystal on the surface of the hard coating layer by 0.02 to 0.1 [mu]m; and furthermore, the grain crystals with a grain diameter lower than 0.15 [mu]m account for less than 20% of the grain crystal grain diameter length.

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