Cutting tool made of surface-coated cubic boron nitride-based ultra-high pressure sintered material having high peeling resistance

A boron nitride-based, surface-coated technology, applied in the direction of manufacturing tools, turning equipment, metal processing equipment, etc., can solve problems such as abnormal boundary damage, insufficient high-temperature strength, insufficient heat resistance, and high-temperature hardness. Prevention of abnormal damage, excellent high-temperature hardness, and excellent heat resistance
CN102528104AActive Publication Date: 2012-07-04MITSUBISHI MATERIALS CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MITSUBISHI MATERIALS CORP
Publication Date
2012-07-04

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Abstract

The invention provides a cutting tool made of surface-coated cubic boron nitride-based ultra-high pressure sintered material, which develops good property of peeling resistance when high-rigidity steel undergoes high-speed cutting. The cutting tool is formed by forming hard coating layer on the surface of CBN-based ultra-pressure sintered body whose cubic boron nitride is 50-85 capacity%. The hard coating layer comprises a lower layer and an upper layer whose average layer thickness is 1.5-3Mum. The lower layer has a complex nitride layer satisfying a formula: [Ti1-XA1X]N, wherein in terms of atomic ratio, X is 0.30-0.60. The upper layer has a thin layer A and a thin layer B which is alternative and has 0.03-0.3Mum average layer thickness. The thin layer A includes a complex nitride layer satisfying a formula: [Ti1-XA1X]N, and the thin layer B includes TiN layer. The surface roughness, residual stress and nano-indentation hardness are set to be a predetermined value.
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Description

technical field

[0001] The present invention relates to a cutting tool made of surface-coated cubic boron nitride-based ultra-high pressure sintered material (hereinafter referred to as coated cBN-based sintered tool). The hard coating layer of the cutting tool has excellent high-temperature hardness, high-temperature Strength, heat resistance, and excellent adhesion, so even when used in high-speed cutting of high-hardness steel such as alloy steel and bearing steel quenched material, it can also exhibit excellent peeling resistance, and it is also resistant to cutting for a long time. The excellent finishing surface accuracy of the workpiece can be maintained, and a hard coating layer is formed on the surface of the cutting tool base body composed of cubic crystal boron nitride-based ultra-high pressure sintered material. Background technique

[0002] Generally, the following tools are known among the coated cBN-based sintered tools: an indexable insert detachably mounted ...

Claims

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