Crosslinked PVD hard coating high-speed cutting tool and manufacturing method

Abstract

The invention discloses a crosslinked PVD hard coating high-speed cutting tool and a manufacturing method. The cutting tool comprises a base material and a PVD coating coated on the outer side of thebase material. The surface of the PVD coating is coated with a diamond film. Dots distributed irregularly are punched in the outer surface of the diamond film through punching pin. The periphery of the diamond film is coated with a CVD coating. The PVD coating and the CVD coating are tightened, mutually crosslinked and composited into a whole through the diamond film and the dots distributed in the diamond film. The cutting tool has the advantages that the coatings are tightened, mutually crosslinked and composited into a whole, and the tool material bending strength is greatly improved; and the diamond film is unique in design and reliable in crosslinking, the compositing capacity is improved, the situation the interior of the coatings are in tensile stress state is avoided, thus, microcracks occur to the tool during usage, the interior of the PVD coating is in a compressive stress state, the microcracks in the coating can be automatically repaired, and the service life is prolonged.

Description

technical field [0001] The invention relates to a high-speed cutting tool, in particular to a cross-linked PVD hard-coated high-speed cutting tool and a manufacturing method thereof. Background technique [0002] The use of coating technology can make the tool obtain good mechanical properties, thereby improving the service life of the cutting tool and improving the machining efficiency. It is a material surface treatment process developed in modern times. The current conventional coating technology can usually be divided into chemical vapor deposition (CVD) ) technology and physical vapor deposition (PVD) technology. For CVD technology, due to the high bonding strength between the coating and the substrate and its good wear resistance, it is widely used in the cemented carbide tool. Surface treatment, however, CVD technology still has problems such as high processing temperature, easy to reduce the bending strength of the tool material, and easy to cause microcracks when th...

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Problems solved by technology

[0002] The use of coating technology can make the tool obtain good mechanical properties, thereby improving the service life of the cutting tool and improving the machining efficiency. It is a material surface treatment process developed in modern times. The current conventional coating technology can usually be divided into chemical vapor deposition (CVD) ) technology and physical vapor deposition (PVD) technology. For CVD technology, due to the high bonding strength between the coating and the substrate and its good wear resistance, it is widely used in the cemented carbide tool. Surface treatment, however, CVD technology still has problems such as high processing temperature, easy to reduce the bending strength of the tool material, and easy to cause microcracks when the tool is used, which seriously restricts its development. The cutting performance of high-speed steel tools can be greatly improved, and the processing temperature can be controlled below 500°C. When it is below 600°C, it has no effect on the bending strength of the tool material. Compared with CVD technology, it has also developed faster. However, This technology still has the problem of low bonding degree, so it also restricts its development from another aspect. Therefore, how to improve the bonding strength and the bending resistance of the tool is a difficult technical problem. Later, someone proposed The scheme of superimposing CVD and PVD to form two operation steps has been proved that due to the constraints of the attributes of the two processes, it is difficult to integrate and develop, so this technology has been tepid

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