TiSiCN-Coated Cutting Edge Composition for Wear and Breakage Resistance
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Solution Overview
Problem
Cutting tools with TiSiCN layers face challenges in achieving both high wearing resistance and breakage resistance, particularly in intermittent turning of steel, due to their high hardness and amorphous structures which make them prone to film breakage.
Innovation Solution
A cutting tool design featuring a TiSiCN layer with a composition of Ti(1-Xr)SiXrCN on the rake face and Ti(1-Xe)SiXeCN on the cutting edge, where Xr and Xe range from 0.010 to 0.100, and satisfy Xr−Xe≥0.003, combined with a lamellar structure, pillar structure, and high cubic crystalline content, to enhance both wearing and breakage resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a TiSiCN layer with high silicon content is used to improve wearing resistance, then hardness increases, but breakage resistance decreases due to amorphous structure vulnerability
Solution Approach 1:
The patent applies local quality by creating two distinct TiSiCN layers with different silicon compositions: a first TiSiCN layer with higher silicon content (Xr) on the rake face for wearing resistance, and a second TiSiCN layer with lower silicon content (Xe) on the cutting edge region for breakage resistance. This spatial differentiation of material properties resolves the contradiction between hardness and toughness requirements in different functional zones.
Solution Approach 2:
The patent employs composite materials by combining two TiSiCN layers with different compositions (Ti(1-Xr)SiXrCN and Ti(1-Xe)SiXeCN) where Xr > Xe. This composite structure integrates the high hardness of silicon-rich regions with the high toughness of silicon-poor regions, achieving both wearing and breakage resistance simultaneously.
2Strength
If the TiSiCN layer is made harder to improve wearing resistance, then the coating becomes more brittle and prone to film breakage
Solution Approach 1:
The patent applies local quality by creating two distinct TiSiCN layers with different silicon compositions: a first TiSiCN layer with higher silicon content (Xr) on the rake face for wearing resistance, and a second TiSiCN layer with lower silicon content (Xe) on the cutting edge region for breakage resistance. This spatial differentiation of material properties resolves the contradiction between hardness and toughness requirements in different functional zones.
Solution Approach 2:
The patent employs composite materials by combining two TiSiCN layers with different compositions (Ti(1-Xr)SiXrCN and Ti(1-Xe)SiXeCN) where Xr > Xe. This composite structure integrates the high hardness of silicon-rich regions with the high toughness of silicon-poor regions, achieving both wearing and breakage resistance simultaneously.
Data Source
AI summary
A cutting tool including a substrate and a coating film disposed on the substrate, wherein the cutting tool includes: a rake face, a flank face contiguous to the rake face; and a cutting edge region composed of a boundary part between the rake face and the flank face, wherein the coating film includes a TiSiCN layer, the TiSiCN layer has: a first TiSiCN layer positioned in the rake face; and a second TiSiCN layer positioned in the cutting edge region, the first TiSiCN layer has a composition of Ti(1-Xr)SiXrCN, the second TiSiCN layer has a composition of Ti(1-Xe)SiXeCN, and the Xr and the Xe each represent 0.010 or more and 0.100 or less, and satisfy a relationship of Xr−Xe≥0.003.