Cubic Crystal Coated Cutting Tool for Chipping and Boundary Wear
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Solution Overview
Problem
Existing coated tools experience abnormal wear issues such as chipping and boundary wear, which affect their performance and longevity in cutting processes.
Innovation Solution
A coated tool with a base body made of cemented carbide alloy and a coating layer composed of a cubic crystal structure containing elements from Group 4a, 5a, and 6a, along with Al, Si, B, Y, Mn, C, and N. The coating layer has a homogeneous structure with aligned crystal orientations, achieved by controlling the X-ray intensity distribution in the positive pole figure, which suppresses abnormal wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is applied to improve wear resistance, then wear resistance is improved, but abnormal wear such as chipping and boundary wear occurs
Solution Approach 1:
The invention changes the crystal orientation parameters of the coating layer by controlling the deposition process to achieve a specific texture where the (111) plane normal is inclined at 10° or less from the surface normal. This parameter change in crystal orientation suppresses abnormal wear mechanisms while maintaining wear resistance
Solution Approach 2:
The coating layer is formed as a composite structure with specific cubic crystal phases containing Group 4a, 5a, and 6a elements combined with Al, Si, B, Y, Mn, C, and N. This composite material approach creates a coating that resists both adhesive and abrasive wear while preventing chipping and boundary wear
2Reliability
If the coating layer has high hardness for wear resistance, then wear resistance is improved, but the coating becomes more prone to chipping
Solution Approach 1:
The invention optimizes the crystal orientation parameter (inclination angle of (111) plane normal) to 10° or less from the surface normal, which creates a balanced structure that maintains surface hardness for wear resistance while the aligned crystal structure provides toughness to prevent chipping
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 described coated tool effectively suppresses abnormal wear such as chipping and boundary wear, enhancing its wear resistance and heat resistance, and thereby improving its performance and longevity in cutting processes.
Implementation Method 1
The coating layer contains a cubic crystal composed of at least one element selected from Group 4a, 5a and 6a elements under the periodic law, Al, Si, B, Y, and Mn, and at least one element selected from C and N
Implementation Method 2
In a measurement range of 0° or more and 90° or less in a distribution of X-ray intensity on an α axis in a positive pole figure for a (111) plane of the coating layer
Data Source
AI summary
A coated tool includes a base body and a coating layer located on a surface of the base body. The coating layer contains a cubic crystal composed of at least one element selected from Group 4a, 5a and 6a elements under the periodic table, Al, Si, B, Y, and Mn, and at least one element selected from C and N. In a measurement range from 0° to 90° in a distribution of X-ray intensity on an α axis in a positive pole figure for a (111) plane of the coating layer, a difference between a maximum value and a minimum value of the X-ray intensity in a range where an angle of the α axis is from 30° to 90° is 10% or less of the maximum value.