TiCN Coated Cutting Tool Wear and Chipping Resistance
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Solution Overview
Problem
Conventional surface-coated cutting tools with TiCN layers face issues of insufficient wear resistance during continuous cutting and chipping resistance during intermittent cutting, particularly when cutting cast iron, due to peeling of the coating film from the base material.
Innovation Solution
A surface-coated cutting tool with a TiCN layer having a columnar crystal region, characterized by a specific composition (0.67 ≤ x/(x + y) ≤ 0.90) and plane spacing (0.8765 Å to 0.8790 Å), and an alumina layer, which improves wear and chipping resistance by enhancing adherence and uniform wear distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the atomic ratio of carbon to the sum of carbon and nitrogen in the TiCN layer is increased to improve wear resistance, then wear resistance is improved, but the coating film is more likely to be peeled off from the base material, resulting in insufficient chipping resistance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the atomic ratio of carbon to the sum of carbon and nitrogen within 0.70 to 0.90, and controlling the crystal grain inclination angle distribution. This optimization of compositional parameters and structural parameters simultaneously achieves improved wear resistance and enhanced adhesion to prevent coating film peeling, thereby resolving the contradiction between wear resistance and chipping resistance.
Solution Approach 2:
The patent uses TiCN layer as a composite coating material with specific composition ratios and crystal structures. The TiCN layer combines titanium, carbon, and nitrogen in optimized proportions to create a material that exhibits both high wear resistance and good adhesion properties, preventing the coating from peeling off during intermittent cutting operations.
2Reliability
If a specific inclination angle distribution with respect to the crystal plane of the crystal grain of the TiCN layer is provided to improve chipping resistance, then chipping resistance is improved, but the coating film cannot be highly hardened, resulting in insufficient wear resistance
Solution Approach 1:
The patent resolves this contradiction by optimizing multiple parameters simultaneously: the atomic ratio of carbon to the sum of carbon and nitrogen (0.70 to 0.90) and the crystal grain inclination angle distribution. This dual parameter optimization enables the coating to achieve both high hardness for wear resistance and appropriate crystal orientation for chipping resistance.
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 solution significantly enhances both wear resistance and chipping resistance, preventing peeling and maintaining performance during high-stress applications, while maintaining a balance between hardness and impact resistance.
Implementation Method 1
improves wear and chipping resistance by enhancing adherence and uniform wear distribution
Implementation Method 2
significantly enhances both wear resistance and chipping resistance, preventing peeling and maintaining performance during high-stress applications
Data Source
AI summary
A surface-coated cutting tool according to the present invention includes a base material and a coating film formed on the base material. The coating film includes at least one TiCN layer. The TiCN layer has a columnar crystal region. The columnar crystal region is characterized by having a composition of TiCxNy (in which 0.65 ≤ x/(x + y) ≤ 0.90), having a (422) plane having a plane spacing of 0.8765 Å to 0.8790 Å and having TC (220) showing a maximum value in an orientation index TC (hkl).