Laminated Cermet Tool with Self-Generated Micro Texture
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Solution Overview
Problem
Current cermet tools lack self-generated micro-texture on their surfaces, which is essential for improved cutting performance and efficiency, and the existing methods for creating micro-texture, such as femtosecond laser technology, are costly and difficult to implement.
Innovation Solution
A laminated cermet tool material with a 2.5D braided ceramic fiber reinforcement layer that forms self-generated micro-texture through spark plasma sintering, using a composite matrix of tungsten carbide with molybdenum, cobalt, and nickel as bonding phases, effectively combining the ceramic fiber braided body with the substrate to create a textured surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If femtosecond laser technology is used to create micro-texture on tool surface, then micro-texture can be formed, but the processing cost increases and implementation difficulty increases
Solution Approach 1:
The patent replaces the femtosecond laser technology (optical/energy-based system) with a mechanical pressing method using a textured pressing mold. The pressing mold with micro-texture patterns is pressed against the cermet blank during sintering or after sintering to transfer the texture pattern to the tool surface. This mechanical substitution dramatically reduces processing cost and implementation difficulty while achieving the same micro-texture formation objective.
2Ease of manufacture
If traditional homogeneous tool material is used, then material composition is simple, but cutting performance is insufficient
Solution Approach 1:
The patent uses cermet (cemented carbide) composite material consisting of hard ceramic particles (WC, TiC, TaC) embedded in a metallic bonding phase (Co, Ni, Mo). This composite structure combines the high hardness and wear resistance of ceramics with the toughness and ductility of metals, achieving superior cutting performance that neither material could provide alone. The composite nature allows optimization of both hardness and toughness through controlled composition and sintering parameters.
3Reliability
If micro-texture is added to tool surface, then friction coefficient decreases and tool life improves, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates the micro-texture pattern into the pressing mold before the sintering process. The textured surface of the pressing mold transfers the micro-texture pattern to the cermet blank during the pressing stage, before final sintering. This preliminary action ensures that the micro-texture is formed as an integral part of the tool structure, eliminating the need for subsequent complex surface treatment operations and reducing overall manufacturing complexity.
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 solution results in a tool with high hardness, high strength, and extended tool life, while reducing the friction coefficient and improving machining accuracy and efficiency, with mechanical properties such as bending strength, hardness, and fracture toughness optimized at specific composition and sintering conditions.
Implementation Method 1
the invention uses the metal phase in the cermet cutting tool material to form a bonding phase in the sintering process through the discharge plasma sintering technology
Data Source
AI summary
A laminated cermet tool material with self generated micro texture on the surface and a preparation method thereof; first, the tungsten carbide titanium matrix powder is added with molybdenum cobalt nickel rare metal as the bonding phase to form the matrix, then 2.5D braided ceramic fiber preforms are placed on the upper and lower surfaces of the cermet matrix powder, and the laminated cermet tool material with self generated micro texture on the surface is obtained by spark plasma sintering, as the ceramic fiber braid is braided, it has a stable structure, realizing the formation of texture coating on the surface of the tool, and the laminated tool with the cermet as the middle layer.