TiSiN-WS2/Zr-WS2 coated cutting tool and preparation process thereof

Abstract

The invention relates to a TiSiN-WS2 / Zr-WS2 coated cutting tool and a preparation process thereof. The matrix material of the TiSiN-WS2 / Zr-WS2 coated cutting tool is a hard alloy, and the cutting tool is prepared by adopting a multi-arc ion plating and intermediate-frequency magnetron sputtering combined method; and a coating is of a multilayer structure and sequentially comprises a Ti+TiN transition layer, a TiSiN layer, a TiN+Ti+Ti / Zr+Zr transition layer, a WS2 / Zr layer and a WS2 layer from the matrix to the surface coating of the tool, wherein the content of Zr element in the WS2 / Zr layer is gradually reduced from inside to outside. Due to the gradient change of Zr element in the WS2 / Zr layer, the hardness and the bearing capability of a lubricating layer are increased, a better transition between the TiSiN layer and the WS2 layer is achieved, and thus the lubricating effect is enhanced. The high hardness and high wear resistance of the TiSiN layer and the lubricating property of the WS2 coating are well combined, thereby preventing adhering, reducing a cutting force and a cutting temperature, reducing the abrasion of the tool, and prolonging the service life of the tool. The cutting tool can be widely applied to dry cutting and cutting of a difficult-to-machine material.

Description

1. Technical field [0001] The invention belongs to the technical field of mechanical cutting tool manufacturing, and in particular relates to a coating tool and a preparation process thereof. 2. Background technology [0002] As a superhard coating, TiSiN coating has extremely high hardness, oxidation resistance and wear resistance are also outstanding, and has been applied in cutting tools and other aspects. However, its friction coefficient is high, and high friction temperature is prone to occur during the friction process; in dry cutting processing, it is prone to sticking to the knife. WS 2 、MoS 2 , BN and other "soft" coatings have a very low coefficient of friction and very good self-lubricating properties, but their hardness is very low. During the cutting process, under the action of high stress and high temperature, they are easy to wear, which greatly limits their use in cutting tools. Applications. With the development of coating technology, diversification, ...

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Problems solved by technology

[0003] The Chinese patent "Application No.: 200910256536.9" reports the periodic deposition of multi-coated cutting tools by physical vapor deposition and its preparation method. Each cycle of the coating includes a TiN layer to a TiSiN layer to a TiAlSiN layer to a TiSiN layer. The coating consists of Multiple cycles are superimposed; the tool coating has high hardness and wear resistance, which can improve tool life during cutting, but its friction coefficient is still high during dry cutting

The coated tool combines the high hardness, high wear resistance of ZrN coating and MoS 2 The lubricity of the coating improves the performance of the tool in the dry cutting process to a certain extent, but due to the 2 The hardness of the coating is low, and it is easy to wear under the high stress and high temperature environment of the cutting process, which reduces its self-lubricating effect

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