PCBN Body Composition for Longer Tool Life in Superalloy Cutting
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Solution Overview
Problem
Current tooling solutions for machining heat-resistant nickel-based or cobalt-based super alloys face limitations in cutting speed and tool life due to wear mechanisms like crater wear, flank wear, and notch wear, with polycrystalline cubic boron nitride (PCBN) tools being costly and requiring improved productivity.
Innovation Solution
A sintered PCBN body with a binder phase comprising zirconium oxide, alumina, and metal nitrides such as vanadium nitride, niobium nitride, or hafnium nitride, which enhances flank wear resistance and notch wear resistance, thereby extending tool life and improving machining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PCBN materials with TiC or TiCN binder are used, then cutting tools can maintain high hardness at elevated temperatures, but the cost is high and productivity is limited
Solution Approach 1:
The patent changes the chemical composition parameters of the binder phase by replacing conventional TiC/TiCN with a new system comprising ZrO2 (20-100 vol%), Al2O3 (up to 80 vol%), AlN (10-50 vol%), and other metal nitrides (10-50 vol%). This parameter change in binder composition enables both high-temperature hardness retention and improved productivity through enhanced wear resistance and extended tool life
Solution Approach 2:
The invention creates a composite binder phase combining multiple metal oxides (ZrO2, Al2O3) and metal nitrides (AlN, VN, NbN, HfN) in specific proportions. This composite material approach leverages the complementary properties of each component: ZrO2 for high-temperature stability, Al2O3 for hardness, and metal nitrides for wear resistance, achieving both reliability and improved productivity
2Duration of action of stationary object
If PCBN materials are used instead of cemented carbide, then tool life is extended due to high hardness at elevated temperatures, but the cost increases significantly
Solution Approach 1:
The patent modifies the binder composition parameters to use a cost-effective combination of ZrO2, Al2O3, and metal nitrides that maintains the high-temperature performance and tool life characteristics of conventional PCBN while reducing material costs through alternative oxide and nitride phases
Solution Approach 2:
The invention develops a PCBN material system that extends tool life (making the tool less disposable) through its enhanced wear resistance and high-temperature stability, thereby improving cost-effectiveness by reducing the frequency of tool replacement despite the inherent higher cost of PCBN materials
3Productivity
If cutting speed is increased to improve productivity, then metal removal rate increases, but wear mechanisms (crater wear, flank wear, notch wear) accelerate and reduce tool life
Solution Approach 1:
The composite binder phase combining ZrO2, Al2O3, and metal nitrides provides synergistic wear resistance mechanisms that protect against crater wear, flank wear, and notch wear even at high cutting speeds, enabling improved productivity without sacrificing tool life
Solution Approach 2:
The specific compositional parameters of the binder (ZrO2: 20-100 vol%, Al2O3: up to 80 vol%, metal nitrides: at least 10 vol% each) are optimized to provide enhanced wear resistance that allows operation at higher cutting speeds while maintaining acceptable tool life and 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 PCBN body with the specified binder phase composition demonstrates increased tool life and improved wear resistance, achieving higher productivity and cost-effectiveness compared to conventional PCBN solutions with TiC or TiCN binders.
Implementation Method 1
the PCBN material has advanced properties to improve tool-life during machining operations. When a better flank wear resistance and/or notch wear resistance is obtained, an extended tool life will be obtained
Implementation Method 2
a sintered PCBN body comprising between 40 and 85 vol % of cubic boron nitride (cBN) particles and between 15 and 60 vol % of a binder phase
Data Source
AI summary
A sintered polycrystalline cubic boron nitride (PCBN) body includes between 40 and 85 vol % of cubic boron nitride (cBN) particles and between 15 and 60 vol % of a binder phase. The binder phase has at least one metal oxide and at least one metal nitride. The metal oxide includes between 20 and 100 vol % of zirconium oxide (ZrO2) and up to 80 vol % of alumina (Al2O3) counted as a volume percentage of the total metal oxide content of the binder phase. The metal nitride includes aluminium nitride (AlN) and at least one metal nitride selected from the group consisting of vanadium nitride (VN), niobium nitride (NbN) and hafnium nitride (HfN). The content of the selected metal nitride selected is at least 10 vol % of the total binder phase, and the content of the metal oxide is at least 10 vol % of the total binder phase.