Surface-coated cutting tool with hard coating layer having excellent abrasion resistance

Abstract

The invention provides a surface-coated cutting tool with a hard coating layer having excellent abrasion resistance, wherein the hard coating layer has excellent abrasion resistance in intermittent re-cutting process. According to the invention, the base surface of a WC base cemented carbide tool is subject to physical vapor deposition to form a hard coating layer of a surface-coated cutting tool made of TiN layer. The height of the TiN layer is equal to that of an average layer. The TiN layer is made of elongated plate-shaped TiN crystalline grains, which grows along the vertical direction relative to the base surface of the tool. In addition, when the TiN crystalline grain structure of the horizontal section of the TiN layer with a height of 0.1 mu m is observed, the occupied area ratio of the elongated plate-shaped TiN crystalline grains with the short side thereof 5 -100 nm and the aspect ratio of 3 or more to the entire horizontal cross-sectional area is more than 30 %.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool) made of tungsten carbide (hereinafter referred to as WC)-based cemented carbide. According to the hard coating layer, it grows in the vertical direction relative to the surface of the tool substrate. The long and flat TiN grain structure exhibits excellent fracture resistance even when used under severe cutting conditions such as interrupted heavy cutting, and realizes a long life of the cutting tool. Background technique [0002] In general, known sheathing tools include inserts that are detachably attached to the tip of a turning tool for use in turning of workpieces such as various steels and cast irons, or inserts that are detachably attached and used in An insert type end mill that performs cutting in the same way as a solid end mill, such as face cutting, grooving, and shoulder processing. [0003] And, widely known as clad tool has the clad...

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Problems solved by technology

[0008] The current situation is as follows: In recent years, the FA of cutting processing equipment is very remarkable, and there are strong demands for cutting labor saving, energy saving, cost reduction, and even high efficiency. There is a tendency for more efficient heavy-duty cutting such as depth, but there are no special problems when cutting various steels or cast irons under normal conditions in the above-mentioned conventional coated tools, but it is used to apply large intermittent to the cutting edge. During intermittent heavy cutting with high impact loads, the cutting edge is likely to be chipped, and due to this reason, the service life is reached in a relatively short period of time.

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