Workpiece Surface Protrusions for Higher Yield Strength
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Solution Overview
Problem
Conventional methods for improving yield strength of workpieces, such as heat treatment and laser surface texturing, are energy-intensive and costly, and often compromise ductility, while mechanical surface texturing methods are expensive and inefficient.
Innovation Solution
A method and apparatus using a punch and die assembly with a template mesh to form surface protrusions through plastic deformation, which increases yield strength by at least 10% without the need for expensive equipment or high energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat treatment is used to improve yield strength, then strength increases, but ductility declines and energy consumption increases
Solution Approach 1:
The patent replaces thermal energy-based heat treatment with a mechanical process using a punch and die assembly to create surface protrusions. This mechanical approach achieves strength enhancement through plastic deformation and strain hardening without the high energy consumption associated with heating materials above recrystallization temperature.
Solution Approach 2:
The invention creates localized surface protrusions with dimensions of 1-10 microns that concentrate strain hardening effects at specific surface locations. This local mechanical modification improves yield strength without requiring global thermal treatment of the entire workpiece, reducing overall energy consumption.
2Strength
If heat treatment is used to improve yield strength, then strength increases, but ductility declines
Solution Approach 1:
The patent applies strain hardening locally through surface protrusions rather than uniformly throughout the material. This localized mechanical modification preserves the bulk material's ductility while enhancing surface yield strength, avoiding the trade-off where global heat treatment reduces overall ductility.
Solution Approach 2:
The invention applies partial strain hardening only to the surface layer through controlled plastic deformation, rather than treating the entire material volume. This partial action achieves sufficient yield strength improvement while leaving the core material properties, including ductility, largely unchanged.
3Strength
If laser surface texturing is used to create micron sized features, then yield strength improves through strain hardening, but manufacturing cost increases
Solution Approach 1:
The patent uses simple, inexpensive punch and die tools to create surface protrusions, replacing expensive laser equipment. The mechanical tools can be easily manufactured and replaced, making the process cost-effective compared to precision laser engraving machines and controlled tool-room conditions.
Solution Approach 2:
The invention replaces optical-based laser texturing with a simpler mechanical punching system. This substitution eliminates the need for expensive laser equipment, precision instrumentation, and controlled environmental conditions, significantly reducing manufacturing costs while achieving the same strain hardening effect.
4Ease of manufacture
If mechanical surface texturing with textured roll is used, then manufacturing cost decreases, but the process is inefficient and limited to specific workpiece sizes
Solution Approach 1:
The patent creates discrete surface protrusions through localized punching rather than continuous rolling. This segmented approach allows the process to be applied to workpieces of any size without the limitations of roll contact, improving versatility and efficiency while maintaining cost-effectiveness.
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 effectively enhances yield strength by forming surface protrusions through plastic deformation, improving mechanical properties while being time-efficient and cost-effective, without compromising ductility.
Implementation Method 1
a plurality of surface protrusions is formed by plastic deformation on the one or more workpieces, to improve yield strength of the one or more workpieces
Implementation Method 2
These processes induce strain hardening on workpiece, and improve the yield strength
Data Source
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AI summary
The present disclosure discloses a method for improving yield strength of one or more workpieces. The method includes positioning the one or more workpieces in a punch and die assembly and operating the punch and die assembly such that, a plurality of surface protrusions are formed on the one or more workpieces. The plurality of surface protrusions are formed by plastic deformation on the one or more workpieces, to improve yield strength of the one or more workpieces. The present disclosure also provides an apparatus to improve yield strength of the one or more workpieces. The present disclosure is configured to improve yield strength of the one or more workpieces, without altering its mechanical characteristics.