Sheet Bending Tool Geometry for >90° Chamfers and Undercuts
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Solution Overview
Problem
Existing bending tools struggle to efficiently produce chamfers with angles greater than 90° and undercuts in metal sheets, requiring complex mechanics and multiple pivot movements.
Innovation Solution
A tool with fixed, non-pivotable bending edges on both the upper and lower tools, allowing for a simple and cost-effective design that includes undercuts to achieve chamfers greater than 90° by using a compact and geometrically simple structure with pressure bodies and protruding bending edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pivotable tool bodies with cam controllers are used to produce chamfers greater than 90°, then the desired chamfer angles can be achieved, but the device complexity and mechanical structure become significantly more complex
Solution Approach 1:
Instead of using a pivotable tool body that rotates to achieve chamfer angles greater than 90°, the invention inverts the approach by using a fixed tool body with an undercut geometry. The undercut is a recess in the tool body that allows the workpiece to be bent at angles greater than 90° relative to the tool's main body, eliminating the need for complex pivot mechanisms while achieving the same chamfering effect.
2Device complexity
If fixed bending edges are used on both upper and lower tools, then the device complexity is reduced and structure is simplified, but the ability to produce chamfers greater than 90° is limited
Solution Approach 1:
The invention adds a new dimensional aspect to the tool geometry by introducing an undercut - a recess that extends in a direction perpendicular to the main bending edge. This additional geometric dimension allows the fixed tool body to accommodate workpiece bends at angles greater than 90° without requiring the tool itself to pivot or rotate, thus maintaining structural simplicity while expanding functional capability.
3Manufacturing precision
If pivotable counter tool bodies are used to produce undercuts, then chamfers greater than 90° can be formed, but the ease of operation and mechanical complexity increase
Solution Approach 1:
The invention inverts the conventional approach by making the tool body fixed rather than pivotable. The undercut is formed by the geometry of the fixed tool body itself, specifically by providing a recess in the tool body that allows the workpiece to be bent at angles greater than 90°. This eliminates the need for complex pivot mechanisms and cam controllers, significantly simplifying the ease of operation while maintaining the ability to form undercuts and chamfers greater than 90°.
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
Enables the production of chamfers with angles greater than 90° and undercuts in a straightforward manner, reducing mechanical complexity and increasing efficiency while maintaining high pressure force transmission.
Implementation Method 1
the bending edge of the upper tool is associated with an undercut on the tool body, and the bending edge of the lower tool is associated with an undercut on the counter tool body... enabling the production of chamfers with angles greater than 90° and undercuts
Data Source
AI summary
A planar workpiece machining device has an upper tool and a lower tool that are movable toward each other in a reciprocation direction and in the opposite direction to machine a workpiece arranged therebetween. The upper tool has a clamping shaft, an upper main body, and a tool body arranged opposite the clamping shaft on the main body and having an upper bending edge. The lower tool has a lower main body, on which a counter tool body having a lower bending edge and a counter holder are provided. The lower bending edge is oriented facing the counter holder. The upper bending edge is stationary to the upper main body, and the lower bending edge is stationary to the lower main body. The upper bending edge is associated with an undercut on the tool body and the lower bending edge is associated with an undercut on the counter tool body.