Surface-Coated Cutting Tool With Local TiCN Orientation Control
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Solution Overview
Problem
Conventional cutting tools with surface coatings often have insufficient wear resistance on the flank face despite improved chipping resistance on the rake face, leading to suboptimal performance.
Innovation Solution
A surface-coated cutting tool with a TiCN layer having a (311) orientation on the rake face and a (422) orientation on the flank face, combined with a peening process and an optional Al2O3 layer, is manufactured using chemical vapor deposition and peening techniques to enhance both chipping and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating is provided on both rake face and flank face with the same quality, then chipping resistance on the rake face is improved, but wear resistance on the flank face remains insufficient
Solution Approach 1:
The patent applies different coating qualities to different regions of the cutting tool. The rake face receives a coating with properties optimized for chipping resistance, while the flank face receives a coating with properties optimized for wear resistance. This is achieved through selective application methods where the coating parameters (such as thickness, composition, or structure) are locally adjusted to match the specific functional requirements of each surface region.
2Ease of manufacture
If a single coating layer is applied to both rake face and flank face, then manufacturing process is simple, but performance requirements of different faces cannot be simultaneously satisfied
Solution Approach 1:
The patent segments the coating application process into distinct regions corresponding to the rake face and flank face. This segmentation allows each region to receive a coating tailored to its specific performance requirements. The segmentation can be achieved through spatial separation in the coating chamber, selective masking, or region-specific parameter control during the coating process, enabling independent optimization of each face's coating properties.
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 achieves excellent chipping resistance on the rake face and wear resistance on the flank face, extending the cutting tool's lifespan and improving overall performance.
Implementation Method 1
the TiCN layer covering step is performed by chemical vapor deposition
Implementation Method 2
a peening step of peening the TiCN layer in the rake face
Data Source
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AI summary
A surface-coated cutting tool includes a base material and a coating covering the base material. The base material includes a rake face and a flank face. The coating includes a TiCN layer. The TiCN layer has a (311) orientation in a region d1 in the rake face. The TiCN layer has a (422) orientation in a region d2 in the flank face. When the rake face and the flank face are continuous with each other with a cutting edge face therebetween, the region d1 is a region sandwiched between an imaginary line D1, which is 500 µm apart from an imaginary ridge line on the rake face, and a boundary between the rake face and the cutting edge face, and the region d2 is a region sandwiched between an imaginary line D2, which is 500 µm apart from the imaginary ridge line on the flank face, and a boundary between the flank face and the cutting edge face. When the rake face and the flank face are continuous with each other with a ridge line therebetween, the region d1 is a region sandwiched between the ridge line and an imaginary line D1 which is 500 µm apart from the ridge line on the rake face, and the region d2 is a region sandwiched between the ridge line and an imaginary line D2 which is 500 µm apart from the ridge line on the flank face.