Cutting Instrument Skin Adhesion via Gradient Metal Layer
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Solution Overview
Problem
Existing cutting instruments face challenges in fabrication, maintaining sharpness, and preventing slice adhesion due to low toughness, poor skin adhesion, and difficulty in grinding for sharpness retention.
Innovation Solution
A cutting instrument with a blade core and a cutting blade portion featuring a skin formed from an electrode material reacted by pulse discharges, using a heat-treated mold of metal, ceramic, or silicon powder, with a gradient composition metal layer between the blade core and skin, enhancing adhesion and sharpness retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high hardness skin is formed at a blade edge by thermal spray, then the blade edge hardness is improved, but the skin may have poor adhesion to the blade core with potential detachment in long service
Solution Approach 1:
A transition layer is introduced between the blade core and the hard skin to serve as an intermediary. This transition layer has a composition gradient that gradually changes from the blade core material to the hard skin material, improving interfacial adhesion and preventing detachment while maintaining high blade edge hardness.
Solution Approach 2:
The blade structure is designed as a composite material system consisting of the blade core, transition layer with gradient composition, and hard skin. This composite structure combines the toughness of the core with the hardness of the skin while the gradient transition layer ensures strong bonding between layers.
2Strength
If a high hardness skin is formed at a blade edge by PVD or CVD, then the blade edge hardness is improved, but the skin is smooth causing slices to adhere and is thin making it difficult to grind for sharpness reproduction
Solution Approach 1:
The surface roughness parameter of the hard skin is optimized to a specific range that prevents slice adhesion while maintaining sharpness. The gradient composition and controlled surface characteristics enable the blade to maintain cutting performance and allow for easy sharpness reproduction through grinding.
3Strength
If a stainless steel blade edge is quenched to increase hardness, then the blade edge hardness is improved, but thermal control is difficult and yield is low
Solution Approach 1:
The complex thermal quenching process is replaced by a surface treatment method that forms a hard skin through controlled deposition or reaction. This substitutes the difficult thermal control process with a more controllable surface modification technique, improving manufacturing ease and yield while achieving the desired blade edge hardness.
4Ease of operation
If the blade edge tip is serrated very fine by grinding to increase sharpness, then the sharpness is improved, but the grinding is difficult and requires expert skill
Solution Approach 1:
The blade edge is pre-formed with optimal geometry and surface characteristics during the skin formation process. This preliminary action prepares the edge for subsequent easy sharpening by grinding, eliminating the need for complex expert grinding operations while achieving high sharpness.
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 provides a cutting instrument with improved toughness, high adhesion, and ease of sharpening, maintaining sharpness over time while simplifying fabrication and reducing slice adhesion.
Implementation Method 1
the electrode material having been molten by pulse discharges induced between the blade core and an electrode in a machining oil
Implementation Method 2
a heat-treated mold being the mold as heat-treated
Data Source
AI summary
A cutting instrument has a cutting blade portion formed with a skin made of an electrode material or a reaction product of the electrode material, the electrode material having been molten by pulse discharges induced between the cutting blade portion and an electrode in a machining liquid or gas, having as the electrode one of a mold molded from powder of a kind or powder of a mixture of kinds out of a metal or metals, a metal compound or metal compounds, and a ceramic or ceramics, and a heat-treated mold being the mold as heat-treated.