Ti-Al-V Coated Cutting Tool for Wear and Thermal Crack Resistance
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Solution Overview
Problem
Existing coated tools lack sufficient chipping resistance, thermal crack resistance, and wear resistance, especially during high-speed intermittent cutting.
Innovation Solution
A surface-coated cutting tool with a complex nitride or carbonitride layer of Ti, Al, and V in columnar crystal grains of a NaCl-type face-centered cubic structure, with specific compositional and structural parameters to enhance thermal cracking and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is formed on the substrate to improve wear resistance, then wear resistance is improved, but chipping resistance and thermal crack resistance are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters (X, Y, α) of the complex nitride or carbonitride coating layer, where X represents Al content, Y represents V content, and α represents C/N ratio. By optimizing these parameters within specific ranges, the coating achieves improved chipping resistance, thermal crack resistance, and wear resistance simultaneously during high-speed intermittent cutting.
Solution Approach 2:
The patent employs composite materials by creating a complex nitride or carbonitride coating layer composed of multiple elements (Ti, Al, V, C, N) with specific compositional ratios. This multi-element composite structure provides synergistic effects that enhance chipping resistance, thermal crack resistance, and wear resistance beyond what single-element coatings can achieve.
2Reliability
If a coating layer is formed on the substrate to improve wear resistance, then wear resistance is improved, but thermal crack resistance is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters (X, Y, α) of the complex nitride or carbonitride coating layer, where X represents Al content, Y represents V content, and α represents C/N ratio. By optimizing these parameters within specific ranges, the coating achieves improved chipping resistance, thermal crack resistance, and wear resistance simultaneously during high-speed intermittent cutting.
Solution Approach 2:
The patent employs composite materials by creating a complex nitride or carbonitride coating layer composed of multiple elements (Ti, Al, V, C, N) with specific compositional ratios. This multi-element composite structure provides synergistic effects that enhance chipping resistance, thermal crack resistance, and wear resistance beyond what single-element coatings can achieve.
3Reliability
If a coating layer is formed on the substrate to improve wear resistance, then wear resistance is improved, but chipping resistance is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters (X, Y, α) of the complex nitride or carbonitride coating layer, where X represents Al content, Y represents V content, and α represents C/N ratio. By optimizing these parameters within specific ranges, the coating achieves improved chipping resistance, thermal crack resistance, and wear resistance simultaneously during high-speed intermittent cutting.
Solution Approach 2:
The patent employs composite materials by creating a complex nitride or carbonitride coating layer composed of multiple elements (Ti, Al, V, C, N) with specific compositional ratios. This multi-element composite structure provides synergistic effects that enhance chipping resistance, thermal crack resistance, and wear resistance beyond what single-element coatings can achieve.
Data Source
AI summary
A surface coated cutting tool comprises a substrate and a coating layer, where (a) the coating layer comprises a complex nitride or carbonitride layer; (b) the complex nitride or carbonitride is (AlXVYT1-X-Y)(CαN1-α) (wherein the average values Xavg, Yavg and αavg of X, Y and α, satisfy the relations: 0.600≤Xavg≤0.950, 0.010≤Yavg≤0.300, 0.610≤Xavg+Yavg≤0.990 and 0.0000≤αavg≤0.0050); (c) the complex nitride or carbonitride comprises crystal grains containing a variable amount X of Al, wherein the average Xmax of the maxima Xmax* and the average Xmin of the minima Xmin* of X in the crystal grains satisfy the relations: 0.020≤Xmax−Xmin≤0.400, and 0.020≤Xmax−Xmin≤0.400, and (d) A* (nm)=0.404Xavg+0.4130Yavg+0.4242 (1−Xavg−Yavg) and the lattice constant A (nm) calculated from an XRD pattern satisfy the relation: |A−A*|<0.0010 (nm).