Blade-breaking-resistant surface-coated cutting tool with excellent rigid coating layer performance

Abstract

The invention provides a blade-breaking-resistant surface-coated cutting tool with an excellent rigid coating layer performance during high-speed heavy-cutting machining. On the surface of a tool matrix, for a lower part layer (a), a Ti compound layer is formed through vapor deposition, and for an upper part layer, an alpha-type Al2O3 surface which has a panel polygon (consisting of a flat hexagon) and vertical long grain structure and contains Ti is formed through vapor deposition to be coated on the cutting tool, and among the grains of the upper part layer, the interiors of the grains with the area ratio being more than 60% are segmented by at least two lattice interfaces which are expressed by sigma 3 and constituted in the form of constituent atom common lattice points.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool) capable of cutting various steels or cast irons and other workpieces even under high-speed and heavy-duty cutting conditions accompanied by high heat generation and high loads on the cutting edge. During cutting, the hard coating will not cause chipping, and it will exhibit excellent cutting performance in long-term use. Background technique [0002] In the past, the following cladding tools are known: on a substrate composed of tungsten carbide (hereinafter represented by WC)-based cemented carbide or titanium carbonitride (hereinafter represented by TiCN)-based cermet (hereinafter these are collectively referred to as tool substrates) On the surface, the lower layer composed of Ti compound layer and the α-type Al 2 o 3 In a coating tool where the upper layer of the layer is used as a hard coating layer, [0003] For the upper layer, using a fi...

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Problems solved by technology

[0008] In recent years, the high performance of cutting devices has been remarkable. On the other hand, labor saving, energy saving, and cost reduction in cutting processing have been strongly demanded. As a result, cutting processing has become a trend of higher speed. However, the current situation is as follows: In the above-mentioned conventional In coated tools, when used in high-speed continuous cutting or high-speed interrupted cutting, the upper layer has excellent high-temperature strength and excellent impact resistance, so it is excellent in preventing chipping, etc., but it constitutes a hard coating layer of the upper layer of the α-Al 2 o 3 layer and the above-mentioned conventional AlTiO layer cannot satisfy the high temperature strength and surface properties, so due to high heat and high load on the blade, chipping is likely to occur when heavy cutting is performed under higher speed conditions. reach service life within

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