Loose-Guidance Stamping Tool for Tear-Free Sheet Forming
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Solution Overview
Problem
Current stamping tools for sheet metal blanks face challenges in managing the retention of the blank during shaping, leading to potential thickness reductions or tears, and require costly cutting operations before stamping.
Innovation Solution
The proposed stamping tool incorporates a retaining zone with a clamping sub-zone adjacent to the hollow portion and punch, and non-clamping guide sub-zones outside the clamping area, with specific geometric configurations to facilitate sheet metal retention without the need for pre-cutting, including guide sub-zones with angled surfaces and varying heights to manage the blank's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cutting operation is performed on the sheet metal blank before stamping to ensure adequate retaining surface, then the quality of stamping is improved (avoiding thickness reduction or tears), but the manufacturing cost increases
Solution Approach 1:
The patent applies preliminary action by creating guide sub-zones with specific geometric configurations (angled surfaces and varying heights) before the stamping operation. These guide sub-zones prepare the blank holder and die surfaces to automatically guide and retain the sheet metal blank during stamping, eliminating the need for pre-cutting operations while ensuring adequate retention surface area for high-quality stamping results
2Reliability
If the blank holder clamps the sheet blank extensively to ensure retention during stamping, then the risk of thickness reduction or tears is reduced, but the complexity of the tooling increases
Solution Approach 1:
The patent applies segmentation by dividing the blank holder contact surface into distinct functional zones: clamping sub-zones that apply force to retain the blank, and guide sub-zones with angled surfaces and varying heights that direct blank movement. This segmentation allows reliable blank retention through targeted clamping while simplifying the overall tooling design by using geometric features rather than complex mechanical mechanisms
Solution Approach 2:
The patent applies local quality by giving different regions of the blank holder different functions and geometries. The clamping sub-zones have specific heights for force application, while the guide sub-zones have angled surfaces and varying heights tailored to local blank movement requirements. This localized differentiation achieves reliable retention without requiring uniform complex structures across the entire tooling surface
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 configuration enhances the shaping of sheet metal blanks by reducing the risk of thickness loss and tears, while eliminating the need for pre-cutting operations, thereby lowering manufacturing costs.
Implementation Method 1
The adequate retaining surface of the sheet metal blank allows quality stamping, it makes it possible, for example, to avoid reductions in thickness or tears during the drawing of the sheet metal blank
Data Source
Figure 1~5
AI summary
The invitation consists of a stamping tool (102) for a sheet metal blank (104) comprising: a die (106) with a hollow central portion (108) and a peripheral portion (110); a punch (112) capable of cooperating with the hollow portion of the die in order to stamp the sheet metal blank; a blank holder (114) disposed laterally to the punch and cooperating with the peripheral portion of the die in order to form a retaining zone (116) of the sheet blank; the sheet blank retaining zone comprises a clamping sub-zone (118) of said sheet blank and at least one guide sub-zone (120,120') without clamping of said blank disposed outside the clamping relative to the hollow portion and the punch.