Composite Cutter Edge Structure for Sharpness Without Cracking
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Solution Overview
Problem
Conventional cutters, such as kitchen knives, often face issues with durability and sharpness due to uneven hardness distribution and material limitations, leading to cracking, chipping, and reduced performance over time.
Innovation Solution
A cutter design featuring a base body made of a primary metal component with a secondary metal and hard particles in the cutting edge, where the second metal has lower Vickers hardness than the primary metal, and the hard particles are strategically distributed to enhance sharpness and wear resistance, using a manufacturing method that includes laser cladding and polishing to optimize the cutting edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutting edge is made harder to improve sharpness and wear resistance, then cutting performance is improved, but the material becomes more prone to cracking and chipping
Solution Approach 1:
The patent applies different materials with different properties to different regions of the cutter. The cutting edge portion is made of a harder material (second material) for sharpness, while the base body is made of a more ductile material (first material) to prevent cracking. This local differentiation resolves the contradiction between edge hardness and overall reliability.
Solution Approach 2:
The patent uses a composite structure where the cutting edge portion and base body are made of different materials. The harder second material is combined with the more ductile first material, creating a composite cutter that achieves both sharpness and cracking resistance through material composition rather than uniform material selection.
2Reliability
If the cutting edge is made harder to improve wear resistance, then durability is improved, but the overall strength and toughness of the cutter decreases
Solution Approach 1:
The patent applies hardness locally to the cutting edge portion where wear resistance is needed, while maintaining higher overall strength in the base body through the use of a more ductile first material. This localized property assignment allows wear resistance improvement without sacrificing overall cutter strength.
Solution Approach 2:
The composite structure combines a harder wear-resistant second material at the cutting edge with a stronger, more ductile first material in the base body. This material combination achieves both wear resistance and overall strength simultaneously through strategic material selection and placement.
3Ease of manufacture
If a single material is used for the entire cutter, then manufacturing is simplified, but uniform hardness distribution leads to performance degradation over time
Solution Approach 1:
The patent differentiates material properties by location, using a harder second material for the cutting edge and a more ductile first material for the base body. This local quality differentiation improves durability and performance over time, accepting increased manufacturing complexity as a trade-off for long-term reliability.
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 cutter achieves improved durability, reduced cracking, enhanced sharpness, and prolonged performance by distributing hard particles to increase hardness and wear resistance, while the secondary metal reduces stress and maintains overall strength.
Implementation Method 1
irradiating a laser beam to melt the metal powder
Data Source
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AI summary
A cutter according to one embodiment of the present disclosure includes a sword blade that includes a base body portion and a cutting edge portion disposed along an end portion of the base body portion and connected to the end portion. The base body portion contains a first metal. The cutting edge portion contains a second metal and a plurality of hard particles having hardness higher than that of the second metal. A cutter according to another embodiment of the present disclosure includes a sword blade that includes a base body portion and a cutting edge portion disposed along an end portion of the base body portion and connected to the end portion. The base body portion contains a first metal as a primary component. The cutting edge portion contains, as a primary component, a second metal having hardness lower than that of the first metal.