TiCN Cermet Cutting Insert for Smooth Machined Surfaces
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Solution Overview
Problem
Existing cutting inserts with titanium-based cermets fail to effectively smooth the machined surface of workpieces due to insufficient sharpening of the cutting edge and surface roughness.
Innovation Solution
A cutting insert with a substrate composed of a hard phase containing titanium carbonitride and a binder phase of cobalt and nickel, featuring a second hard phase with compressive residual stress of 150 MPa or more and a cutting edge with a maximum height 2 to 30 times that of the second surface, which polishes immediately upon machining, maintaining sharpness and preventing chipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hard phase with high compressive residual stress is introduced to prevent chipping, then fracture resistance is improved, but the complexity of the hard phase composition increases
Solution Approach 1:
The patent uses composite materials by integrating a second hard phase (titanium-based carbide/nitride/carbonitride) with compressive residual stress of 150MPa or more into the existing TiCN-based cermet structure. This composite approach enhances fracture resistance and prevents chipping while maintaining compositional simplicity through the use of conventional cermet materials with controlled phase distribution rather than introducing entirely new complex materials.
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 cutting insert achieves a smooth machined surface with enhanced wear and fracture resistance, suppressing degranulation and chipping, while maintaining surface accuracy and reducing surface roughness.
Implementation Method 1
the second hard phase in the second surface includes a compressive residual stress of 150 Mpa or more
Implementation Method 2
In X-ray diffraction analysis, a peak of the first hard phase is observed on a higher angle side than a peak of the second hard phase
Data Source
AI summary
The cutting insert may include a substrate including a first surface, a second surface, and a cutting edge. The substrate may include a hard phase and a binder phase, and the hard phase may include a first hard phase and a second hard phase. In X-ray diffraction analysis, a peak of the first hard phase may be observed on a higher angle side than a peak of the second hard phase. The second hard phase in the second surface may include a compressive residual stress of 150 MPa or more. A maximum height (Rz) in the second surface may be 0.2 to 1.5 μm. A maximum height of the cutting edge may be 2 to 30 times the maximum height in the second surface.