Fluid-Assisted Non-Isothermal Stamping of Sheet Blanks
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Solution Overview
Problem
The existing sheet blank stamping processes are limited by the material's ability to withstand deformation without splitting or tearing, which restricts the complexity of shapes that can be formed and production rates.
Innovation Solution
The method involves locally cooling a sheet blank with a stream of fluid at a predetermined area of high stress concentration during forming, using a stream of fluid with a temperature lower than the sheet blank, either before or during the forming process, to increase the material's strength and reduce strain rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the sheet blank is formed into complex shapes with high stress concentration, then the desired shape is achieved, but the material undergoes thinning and splitting due to excessive strain rates
Solution Approach 1:
The patent applies local cooling to change the temperature parameter of the sheet blank in high stress concentration areas, thereby changing the material's mechanical properties (increasing strength, reducing strain rate sensitivity) only in the regions where it is most needed during forming
Solution Approach 2:
The patent implements non-uniform temperature distribution across the sheet blank by applying cooling fluid only to predetermined areas of high stress concentration, creating local quality differences where cooled regions have enhanced strength and uncalled regions maintain original properties
2Strength
If the sheet blank is cooled locally with fluid stream, then the material strength increases and strain rates reduce, but the device complexity increases due to fluid delivery system
Solution Approach 1:
The patent uses fluid dynamics (pneumatics/hydraulics) to deliver cooling medium through nozzles or channels to the sheet blank surface, leveraging fluid flow to achieve cooling without complex mechanical contact systems
Solution Approach 2:
The cooling system is designed to automatically deliver cooling fluid to high stress concentration areas based on the forming process itself, with the fluid delivery activated and directed by the forming operation without requiring separate control systems
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
This approach enhances the sheet blank's ability to withstand deformation, allowing for more complex shapes and higher production rates by reducing material thinning and strain rates during the forming process.
Implementation Method 1
locally cooling the sheet blank with a stream of fluid in a predetermined area of high stress concentration
Data Source
AI summary
A method for stamping a desired shape from a sheet blank includes providing the sheet blank. The method also includes locally cooling the sheet blank with a stream of fluid in a predetermined area of high stress concentration to be experienced during forming of the sheet blank into a desired shape. The method additionally includes forming the metal sheet blank into the desired shape in a stamping press with a punch. A system employing the method for forming a sheet blank is also disclosed.