Sharp Edge Forming by Tapered Rolls to Prevent Cracking
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Solution Overview
Problem
Conventional methods for producing sharp edges, such as honing, result in uneven edges that are susceptible to cracking and chipping, require significant energy, and waste material due to mass removal, failing to enhance the longevity of tools like razor blades.
Innovation Solution
A system using tapered rolls for severe plastic deformation to create a sharp edge with high strength and hardness by compressing material grains to form a homogeneous microstructure without removing material mass, achieved by passing the material through opposed pairs of rotating tapered rolls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional honing methods are used to produce sharp edges, then material can be removed to form a wedge geometry, but the edges become uneven and susceptible to cracking and chipping
Solution Approach 1:
The patent applies severe plastic deformation through controlled parameter changes in the material's microstructure. By using tapered rolls to impose extreme localized deformation, the material undergoes grain refinement and phase transformation that creates a homogeneous, fine-grained structure at the edge, eliminating the unevenness and weakness associated with conventional honing while enhancing crack resistance
Solution Approach 2:
The patent replaces the mechanical removal system (abrasive honing) with a mechanical deformation system (tapered roll compression). Instead of removing material to create sharp edges, the system uses controlled plastic deformation to reshape and densify the material in place, achieving sharp edges without the material loss and microstructural damage inherent in abrasive processes
2Manufacturing precision
If conventional honing methods are used to produce sharp edges, then edges can be formed, but a large amount of energy is required for heat treatment and abrasion
Solution Approach 1:
The patent replaces the energy-intensive thermal and abrasive processes with a cold-forming mechanical deformation process. The tapered rolls deliver extreme localized pressure that achieves sharp edge formation through plastic deformation alone, eliminating the need for separate heat treatment and abrasion steps, thereby dramatically reducing total energy consumption
Solution Approach 2:
The patent performs the edge formation action in a single preliminary deformation step rather than through sequential processes. The severe plastic deformation in the tapered rolls simultaneously achieves the wedge geometry, grain refinement, and microstructural homogenization that would otherwise require multiple separate operations including heat treatment and abrasion
3Manufacturing precision
If conventional honing methods are used to produce sharp edges, then material can be removed to form edges, but significant material is wasted due to mass removal
Solution Approach 1:
The patent changes the fundamental approach from material removal to material transformation. By applying severe localized plastic deformation, the material parameters (density, grain size, phase structure) are changed in the deformation zone to create the sharp edge geometry in place, preserving essentially 100% of the original material mass
Solution Approach 2:
The patent substitutes the material removal mechanism (abrasion) with a material transformation mechanism (plastic deformation). The tapered rolls compress and reshape the material through controlled deformation, achieving sharp edges by redistributing and densifying material in place rather than removing it, thereby eliminating material waste
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 method produces a sharp edge with improved resistance to cracking and chipping, maintaining material mass and enhancing the durability of tools like razor blades.
Implementation Method 1
the material undergoes severe plastic deformation at the tip to allow for a sharp edge having a high strength and hardness
Implementation Method 2
The tapered rolls can include a cylindrical body that exerts a compressive force onto the material to deform the material at a desired location thereof
Data Source
AI summary
The present disclosure is directed to systems, compositions, and methods for manufacturing objects with sharp edges having a high strength and hardness. To form the sharp edge, an object can be subjected to a compressive force that locally deforms the object to create the sharp edge. In some embodiments, deformation can occur by passing the material through a system of one or more opposed tapered rolls having one or more tapering angles for deforming the material. The tapered rolls can rotate and drive the material downstream to a next opposed pair of tapered rolls. The tapered rolls deform the material by changing the material microstructure, compressing the grains of the material in a predetermined location to create a more homogeneous microstructure. The local modification of the resulting microstructure increases the homogeneity as well as the hardness and strength of the material and prevents cracking and/or chipping of the material.