TiCN-Coated Cutting Tool for Wear and Chipping Resistance
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Solution Overview
Problem
Conventional coated cutting tools face challenges in wear resistance, chipping resistance, and fracture resistance, particularly under high-speed cutting conditions, leading to reduced tool life.
Innovation Solution
A coated cutting tool with a specific layer configuration comprising a Ti compound layer, an α-Al2O3 layer, and a TiCN layer, with defined thicknesses and grain orientation conditions, enhancing wear, chipping, and fracture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a TiCN layer with strong (422) peak orientation is used to improve wear resistance, then wear resistance is enhanced, but grain detachment occurs leading to poor chipping and fracture resistance
Solution Approach 1:
The patent applies local quality by creating different grain orientation regions within the TiCN layer. Specifically, it establishes a first region with grains oriented in the (422) plane for wear resistance, and a second region with grains oriented in the (220) plane for chipping and fracture resistance. This spatial differentiation of grain orientations within the same coating layer allows simultaneous optimization of both wear resistance and mechanical strength properties.
Solution Approach 2:
The patent employs composite material principles by combining TiCN layers with different grain orientations ((422) and (220) planes) within a single coating structure. This creates a composite microstructure where each region contributes its specific properties - the (422) oriented region provides wear resistance while the (220) oriented region provides toughness and resistance to chipping and fracture.
2Productivity
If high-speed cutting operations are performed to increase productivity, then cutting speed and efficiency improve, but tool wear and damage increase reducing tool life
Solution Approach 1:
The patent applies local quality by creating different grain orientation regions within the TiCN layer. Specifically, it establishes a first region with grains oriented in the (422) plane for wear resistance, and a second region with grains oriented in the (220) plane for chipping and fracture resistance. This spatial differentiation of grain orientations within the same coating layer allows simultaneous optimization of both wear resistance and mechanical strength properties.
Solution Approach 2:
The patent employs composite material principles by combining TiCN layers with different grain orientations ((422) and (220) planes) within a single coating structure. This creates a composite microstructure where each region contributes its specific properties - the (422) oriented region provides wear resistance while the (220) oriented region provides toughness and resistance to chipping and fracture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The improved layer configuration significantly extends tool life by providing excellent wear, chipping, and fracture resistance.
Implementation Method 1
a conventional coated cutting tool used for the cutting of steel, cast iron, etc., is a coated cutting tool which is obtained by depositing, via chemical vapor deposition, a coating layer with a total thickness of from 3 μm or more to 20 μm or less on a surface of a substrate consisting of a cemented carbide
Data Source
AI summary
A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein the coating layer comprises a lower layer, an intermediate layer, and an upper layer, the lower layer comprises a specific Ti compound layer, the intermediate layer comprises an α-Al2O3 layer, the upper layer comprises a TiCN layer, an average thickness of the entire coating layer is 8.5 μm or more and 30.0 μm or less, an average thickness of the upper layer is 1.0 μm or more and 6.0 μm or less, an average diameter of the specific regions is 0 degrees or more and less than 15 degrees is less than 5.0 μm in the TiCN layer of the upper layer, and 30≤RSA≤70 and 20≤RSB≤60 are satisfied in the TiCN layer of the upper layer.