Boron Nitride Cutting Insert Orientation for Wear Resistance
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Solution Overview
Problem
Existing cutting tools and inserts made from boron nitride sintered bodies face challenges in achieving excellent wear resistance, particularly when compared to those with strong orientation of the (111) plane in cubic boron nitride.
Innovation Solution
The development of an insert and cutting tool featuring a boron nitride sintered body with a specific composition and orientation, including cubic boron nitride and compressed boron nitride, where the compressed boron nitride content value and orientation values are optimized to enhance wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hexagonal boron nitride is used as a comparative example, then the (111) plane can be strongly oriented in the orientation planes of cubic boron nitride, but the amount of wear is large and performance as a cutting tool is poor
Solution Approach 1:
The invention changes the crystallographic orientation parameters by controlling the ratio of (111) plane orientation to other planes. Specifically, it optimizes the I(111)/I(220) ratio to be 10 or more, ensuring strong (111) plane orientation while maintaining cubic boron nitride structure, thereby achieving both wear resistance and cutting performance
Solution Approach 2:
The invention creates a composite sintered body containing both cubic boron nitride and compressed boron nitride in specific proportions (cubic BN: 90-99 wt%, compressed BN: 1-10 wt%). This composite structure combines the wear resistance of strongly oriented cubic BN with the toughness of compressed BN, resolving the contradiction between wear resistance and cutting performance
2Reliability
If cubic boron nitride with strong (111) plane orientation is used, then wear resistance is improved, but the compressed boron nitride content and orientation must be precisely controlled
Solution Approach 1:
The invention establishes specific parameter ranges for composition and orientation: compressed BN content of 1-10 wt%, cubic BN orientation ratio I(111)/I(220) of 10 or more, and compressed BN orientation ratio IhBN(002)v/(IhBN(002)v+IhBN(002)h) greater than the cubic orientation value. These defined parameters simplify the control process while ensuring optimal performance
Solution Approach 2:
The invention applies partial orientation control by focusing primarily on achieving strong (111) plane orientation in cubic BN rather than perfect orientation of all crystal planes. This partial action approach reduces manufacturing complexity while still achieving the necessary wear resistance and cutting performance
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 optimized boron nitride sintered body composition and orientation in the inserts and cutting tools significantly improve wear resistance, leading to a longer tool life and enhanced performance in cutting processes.
Implementation Method 1
In a transmission X-ray diffraction of a cross section of the boron nitride sintered body vertical to the first surface, X-ray intensity at a top of a 111 diffraction peak of the cubic boron nitride is IcBN(111)v, and X-ray intensity at a top of a 002 diffraction peak of the compressed boron nitride is IhBN(002)v
Data Source
AI summary
An insert of the present disclosure includes a boron nitride sintered body including a first surface. In a transmission X-ray diffraction of a cross section of the boron nitride sintered body vertical to the first surface, X-ray intensity at a top of a 111 diffraction peak of cubic boron nitride in a direction vertical to the first surface is IcBN(111)v. X-ray intensity at a top of a 002 diffraction peak of compressed boron nitride is IhBN(002)v. X-ray intensity at a top of a 111 diffraction peak of the cubic boron nitride in a direction parallel to the first surface is IcBN(111)h. X-ray intensity at a top of a 002 diffraction peak of the compressed boron nitride is IhBN(002)h. A compressed boron nitride content value obtained from these X-ray intensities is larger than 0.005. A cubic orientation value is larger than 0.5, and a compressed boron nitride orientation value is larger than the cubic orientation value.