Multilayer Coated Cutting Tool for Stainless Steel Wear Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a demand for cutting tools with longer life, particularly in processes involving stainless steel, as existing tools face challenges in maintaining durability and resistance to wear and breakage.
Innovation Solution
A cutting tool design featuring a substrate coated with a multilayer structure comprising alternating layers of TiaAl1-a-bBbN and TiN, where 0.30≤a≤0.50 and 0.005≤b≤0.10, with specific layer thicknesses and a TiCxN1-x layer, enhancing wear resistance and adhesion, and a TiCxN1-x layer, enhancing wear resistance and adhesion, and a TiCxN1-x layer, improving lubricity and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional coating film is applied to improve wear resistance, then wear resistance is improved, but adhesion and resistance to chipping deteriorate
Solution Approach 1:
The coating film is divided into multiple layers with different compositions and functions: a first layer (TiAlBN) providing wear resistance, a second layer (TiN) improving adhesion, and a third layer (TiCN) enhancing surface properties. This segmentation allows each layer to optimize its specific function without compromising overall performance
Solution Approach 2:
The patent uses composite material structures where TiAlBN, TiN, and TiCN are combined in a layered configuration. Each material contributes its unique properties: TiAlBN for hardness and wear resistance, TiN for adhesion, and TiCN for surface lubricity, creating a synergistic coating system
2Duration of action of stationary object
If coating film thickness is increased to improve durability, then durability is improved, but resistance to breakage and chipping deteriorates
Solution Approach 1:
Instead of using a single thick coating layer, the patent segments the coating into multiple thinner layers (first layer: 0.5-5 μm, second layer: 0.1-2.0 μm, third layer: 0.1-1.0 μm). This segmentation reduces stress concentration and prevents catastrophic failure, allowing the coating to maintain durability while resisting breakage and chipping
Solution Approach 2:
Different layers are designed with specific local properties: the first layer provides wear resistance, the second layer provides adhesion and flexibility, and the third layer provides surface lubricity. This local optimization allows the coating system to achieve overall durability without compromising resistance to breakage
Data Source
AI summary
A cutting tool includes: a substrate; and a coating film including a first layer and a second layer, the first layer consists of a multilayer structure consisting of a first unit layer composed of TiaAl1-a-bBbN, and the second unit layer composed of TiN, where 0.30≤a≤0.50 and 0.005≤b≤0.10, the second layer is composed of TiCxN1-x, where 0.05≤x≤0.40, the second layer includes a first region and a second region, in the first region, an average C1 of percentages of the numbers of carbon atoms with respect to totals of the numbers of the carbon atoms and the numbers of nitrogen atoms is 25% or more and 50% or less, in the second region, an average C2 of percentages of the numbers of carbon atoms with respect to totals of the numbers of the carbon atoms and the numbers of nitrogen atoms is 1% or more and 10% or less.