Multilayer Nitride Coating for Balanced Cutting Tool Wear
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Solution Overview
Problem
Coated cutting tools with AlCrN or TiBN coatings face issues with unbalanced flank and rake face wear, lacking effective suppression of both types of wear resistance.
Innovation Solution
A coated cutting tool with a nitride-based hard coating structure, featuring a base material side single layer portion with a high Al content, a laminated portion with alternating Ti and AlCr layers, and a surface side single layer portion, all with specific atomic ratios and X-ray diffraction patterns, applied using an arc ion plating method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer coating with alternating AlCrB and SiN layers is used, then both flank and rake face wear are suppressed, but the coating structure becomes complex
Solution Approach 1:
The AlCrN-based first coating formation layer serves multiple functions: it provides oxidation resistance, flank face wear protection, and acts as a diffusion barrier. The SiN/SiCN-based second coating formation layers provide rake face protection and chip flow control. This multi-functionality reduces the need for additional specialized layers, simplifying the overall structure while maintaining comprehensive wear 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 tool exhibits balanced suppression of flank and rake face wear, resulting in high performance and extended tool life compared to traditional coatings.
Implementation Method 1
a coated cutting tool having a hard coating on a base material... applied using an arc ion plating method
Implementation Method 2
The coated cutting tool of the present invention has a base material 31 and a hard coating 33 and a laminated portion 34 which are provided on the base material 31 in this order
Implementation Method 3
an X-ray diffraction pattern of a portion formed of the base material side single layer portion and the laminated portion has a single fcc structure
Data Source
AI summary
Provided is a coated cutting tool having a base material side single layer portion and a laminated portion provided as a hard coating in order from a base material side. The base material side single layer portion is formed of a nitride-based hard coating in which a proportion of Al is highest among metal (including metalloid) elements, a sum of Al and Cr in a content ratio (atomic ratio) is 0.9 or more, and at least B is contained. In the laminated portion, a nitride-based a layer in which a proportion of Ti is highest among metal (including metalloid) elements and at least B is contained, and a nitride-based b layer in which a proportion of Al is highest among metal (including metalloid) elements and at least Cr and B are contained are alternately laminated.