Asymmetric Bending Tool Die Geometry for Elongated Workpiece Collision Avoidance
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Solution Overview
Problem
Existing bending tools face issues with bending elongated metal parts, as they can collide with mechanical parts, risk damaging the workpiece, and suffer from die misalignment, leading to reduced operational efficiency and safety concerns.
Innovation Solution
The bending tool design includes dies with adjusted blade and bending block angles and increased spacing to minimize collisions and ensure precise alignment, allowing for safe and efficient bending of elongated workpieces without damaging them, while maintaining die stability during the bending process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blade edge is set at substantially 90 degrees with bisected angles, then the bending tool can achieve precise right angle folding, but the workpiece may collide with mechanical parts when elongated
Solution Approach 1:
The patent applies asymmetry by setting different angles for the inside edge and outside edge of the blade. Specifically, the inside edge angle is 45 degrees while the outside edge angle is 60 degrees, creating an asymmetric blade geometry that prevents workpiece collision while maintaining bending precision
Solution Approach 2:
The patent changes the blade geometry parameters from the conventional symmetric 90-degree bisected angles to asymmetric angles (45 degrees inside, 60 degrees outside). This parameter modification allows the workpiece to be supported properly during bending without colliding with mechanical parts
2Productivity
If the blade rapidly folds the workpiece into the space adjacent to the lower die blade, then the bending operation is efficient, but the workpiece may be damaged and personnel safety is compromised
Solution Approach 1:
The patent implements beforehand cushioning by configuring the outside edge of the blade to extend beyond the bending block by 5-10mm. This creates a cushioning space that prevents rapid, uncontrolled folding and reduces impact forces, thereby protecting both the workpiece and personnel while maintaining operational efficiency
3Device complexity
If the blade parting line is centered in the space between the bending block, then the bending tool structure is simple, but the dies may misalign during pressing operation
Solution Approach 1:
The patent applies asymmetry to the die arrangement by positioning the blade parting line offset from the center of the space between the bending block. The inside edge angle of 45 degrees and outside edge angle of 60 degrees create an asymmetric configuration that inherently maintains die alignment during pressing operations
Solution Approach 2:
The patent implements local quality by creating different angular characteristics at different parts of the blade. The inside edge has a 45-degree angle while the outside edge has a 60-degree angle, providing localized geometric properties that ensure proper die alignment and prevent misalignment during operation
Data Source
AI summary
A bending tool that may be used for bending elongated works and in which the works are not likely to be damaged is provided. An angle formed by a blade parting line L1 or L2 and an outside edge (e.g., 55 degrees) of each die (having an angle of a blade edge of, e.g., 90 degrees) is made larger than an angle formed by the blade parting line L1 or L2 and an inside edge (e.g., 35 degrees). The blade parting line L1 or L2 of one of the dies is located at a predetermined position further toward the blade parting line L2 or L1 of the other of the dies with respect to the center of the space between the blade parting line L2 or L1 and the inner end edge of the bending block.