Cubic boron nitride self-lubricating coated tool and preparation method thereof

Abstract

The invention discloses a cubic boron nitride self-lubricating coated tool and a preparation method thereof. A substrate material of the cutting tool is high speed steel or a hard alloy. The surface of the substrate is a cubic boron nitride coating including CsF, Mo and ZrO2. The coating is prepared by means of an electron beam cladding method. The preparation method comprises the following steps:(1) pre-treatment; (2) boron nitride layer presetting; (3) boron nitride layer cladding; and (4) post-treatment. The tool has integral good toughness, and the surface coating has relatively high hardness and wear resistance. In the cutting process, an in-situ reaction happens on CsF, Mo and ZrO2 under the action of high temperature to generate Cs2MoO4, so that a lubricating role can be played ata relatively high cutting temperature. Meanwhile, the cubic boron nitride self-lubricating coated tool is prepared by means of the electron beam method, so that the coating and the substrate have relatively high bonding strength, the preparation efficiency is high, and oxidization in the preparation process is avoided. The tool can be widely applied to dry cutting and cutting process of hardly processed materials.

Description

technical field [0001] The invention relates to the technical field of mechanical cutting tool manufacturing, in particular to a cubic boron nitride self-lubricating coating tool and a preparation method thereof. Background technique [0002] Dry machining technology is a clean and environmentally friendly manufacturing process that controls the source of environmental pollution. As a new type of green manufacturing technology, it not only has less environmental pollution, but also reduces product costs and reduces the harm to human health. As a new economical and environmentally friendly manufacturing technology, dry cutting has become a research hotspot in green processing. However, during dry cutting, the friction between the tool and chips on the rake face is extremely severe, generating a large amount of heat, resulting in increased tool wear and reduced tool life. Therefore, there is an urgent need to research and develop new cutting tools. Self-lubricating tool mean...

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Problems solved by technology

[0004] Chinese patent "Application No.: 201710709832.4" reports a polycrystalline cubic boron nitride cutting tool material and its preparation method, which is prepared by mixing cubic boron nitride and binder powder by hot pressing sintering and spark plasma rapid sintering , the hardness of the tool prepared by this method is high, and the high temperature performance is excellent; but the toughness of the tool needs to be improved, and the preparation method is relatively complicated and the preparation cost is high

The Chinese patent "Application No.: 20120020397.1" reports a cutting tool with a cubic boron nitride hard coating. The tool uses magnetron sputtering to prepare the coating on the surface of the high-speed steel substrate. The overall tool has good toughness. And the surface hardness is high; but the thickness of the coating on the surface of the tool is limited, the bonding strength between the coating and the substrate is insufficient, and the coating does not have self-lubricating effect

The Chinese patent "Application No.: 02139629.9" reports a boron nitride composite coating cutting tool and its preparation method. It is prepared by plasma pulse laser deposition or electric heating wire assisted radio frequency plasma CVD method. The tool surface coating and The matrix has a strong binding force, but it does not have self-lubricating ability

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