Adjustable Reverse Draw Bead for Real-Time Stamping Force Control
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Solution Overview
Problem
Traditional forming dies with single or double beads face challenges in providing sufficient restraining force during sheet metal forming operations, due to variations in sheet metal properties and thickness, leading to inconsistencies in panel quality.
Innovation Solution
A forming die with a reverse bead geometry, featuring a male bead with a groove and a female bead with an adjustable protrusion, allows for real-time adjustment of the restraining force by changing the position of the protrusion within the female bead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional beads with fixed geometry are used, then the structure is simple and easy to manufacture, but the restraining force cannot be adjusted to accommodate variations in sheet metal properties
Solution Approach 1:
The bead structure transitions from a fixed geometric configuration to a dynamic, adjustable system. The male bead can be repositioned along the female bead's length, allowing the restraining force to be dynamically adjusted based on sheet metal properties, thickness variations, and desired panel quality outcomes.
Solution Approach 2:
The bead system is divided into separable components - the male bead and female bead - which can be independently adjusted relative to each other. This segmentation enables modular adjustment of the restraining force without requiring complete redesign of the entire bead structure.
2Force
If the depth of the female bead and radii of the beads are increased to provide greater restraining force, then the restraining force increases, but the thickness and mechanical properties of the panel are exceeded
Solution Approach 1:
Instead of using fixed deep bead geometries that may exceed panel strength limits, the system allows adjustment of the male bead position to optimize the restraining force. This enables the restraining force parameter to be tuned to match the specific panel's thickness and mechanical properties, preventing over-constraint and potential damage.
3Force
If double beads are used to provide desired restraining forces, then the restraining force is sufficient, but the device complexity and manufacturing cost increase
Solution Approach 1:
The adjustable single bead system performs the function of multiple fixed beads by allowing the male bead to be repositioned to different locations along the female bead. This single adjustable component can provide varying degrees of restraining force equivalent to what would require multiple fixed beads, thereby simplifying the overall structure while maintaining sufficient restraining capability.
4Manufacturing precision
If fixed bead geometry is used, then the manufacturing process is simple, but panel quality varies due to batch-to-batch sheet metal property variations
Solution Approach 1:
The system enables operators to self-adjust the bead configuration based on observed panel quality outcomes or known sheet metal batch properties. This self-adjustment capability allows the forming process to adapt to material variations without requiring complex automated control systems, maintaining productivity while improving consistency.
Data Source
AI summary
A forming die includes a first die component with a male bead and a second die component with a female bead. The male bead and the female bead form a bead with a reverse bead geometry with the male bead having a groove and the female bead having a protrusion complimentary with the groove such that the protrusion is aligned with the groove when the male bead extends into the female bead. Also, the protrusion is adjustable in real-time within the female bead. A stamping machine with the first die component and the second die component has a control unit configured to adjust the protrusion in real-time as a function of mechanical property testing data, width testing data, thickness testing data, lubrication testing data and/or image sensor module data on one or more blanks to be stamped and/or one or more blanks that have been stamped.