Cutting blade with improved coating structure and manufacturing method of cutting blade

Abstract

The invention discloses a cutting blade with an improved coating structure and a manufacturing method of the cutting blade. The cutting blade comprises a matrix A and a coating deposited on the matrix A. The coating is a multi-layer coating and at least comprises an inner layer C and an outer layer D. The inner layer C is composed of carbon-nitrogen oxide of transition elements of the IV B group or carbonitride of transition elements of the IV B group. The outer layer D is a (TiaAlb)(CiNjOk) layer, the thickness of the outer layer D is 1-20 [mu]m. Both the inner layer C and the outer layer D are of face-centered cubic structures. The manufacturing method comprises the steps of manufacturing the matrix A, selectively depositing a transition layer B, depositing the inner layer C, selectively depositing a transition layer E, depositing the outer layer D, and conducting surface treatment. The cutting blade is good in tenacity, abrasion resistance and oxidation resistance, the cutting blade has excellent cutting performance in machining of materials such as steel and stainless steel, and the manufacturing method is simple, convenient to implement, and easy to operate and control.

Description

technical field [0001] The invention belongs to the field of metal cutting, in particular to a cutting blade with improved coating structure and a preparation method thereof. Background technique [0002] Coated inserts or knives are widely used in machining in various industries such as automobiles, aviation, and microelectronics. The processing materials include steel, stainless steel, die steel, copper, aluminum and other metal materials, as well as various alloys, ceramics or composite materials. During the machining process, there are two failure mechanisms for coated tools: wear and breakage. Blade wear mainly includes abrasive wear, adhesive wear, diffusion wear and oxidation wear. Under different cutting conditions, when processing workpieces of different materials, the main cause of wear may be one or more of them. Generally speaking, when the cutting temperature is low, abrasive wear is the main one, and when the cutting temperature is high, it is mainly adhesive...

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Problems solved by technology

CN103171178A Chinese patent document discloses a cutting tool with improved transition layer structure, the transition layer consists of two layers of TiC with different compositions x N y o z and 1 layer of TiAlC x3 N y3 o z3 Composite, the thickness is very small, can refine the outer layer α-Al 2 o 3 grain of the coating while improving the outer layer of α-Al 2 o 3 The bonding performance of the coating, the optimization of this transition layer improves the TiCN/Al 2 o 3 The bonding strength of the interface can improve the anti-stripping performance of the coating, but due to the existence of residual stress and thermal cracks, the strength of the CVD-coated insert has not been improved. In the middle, it is prone to edge chipping and failure

CN101219591A Chinese patent document discloses a CVD-coated insert for shallow hole drilling with high toughness requirements. The coating includes: TiC x N y o z The first (innermost) layer, thickness x N y o z layer with a thickness of 1 μm to 8 μm, with columnar grains; fine-grained grains К-Al 2 o 3 layer, thickness 0.5 μm to 5 μm, and additional TiC thickness x N y o z layer, at the rake face, completely or partially provided wi

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