Metal Sheet Edge Guide for Precise Frustoconical Bending
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current guide systems for bending metal sheets into conical structures face issues with edge damage due to concentrated pressure and sliding friction, and lack versatility for different curvature values, leading to inefficiencies and safety concerns.
Innovation Solution
A device with resting and contrasting means that extend along a closed path, conforming to the metal sheet's edge to distribute pressure evenly, preventing sliding and rolling, and using a supporting body with adjustable geometry to accommodate various curvature radii, ensuring continuous and precise conical curvature without edge damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pin or wheel element is used to impose rotation on the advancing metal sheet, then the metal sheet can be rotated around a set rotation centre, but the localized pressure forces cause damage to the edge, especially when the metal sheet thickness is reduced
Solution Approach 1:
The single pin or wheel element is segmented into multiple smaller elements (pins, rollers, or wheels) arranged in a matrix pattern. This segmentation distributes the rotation function across multiple contact points, reducing the localized pressure on any single point of the metal sheet edge while maintaining the overall rotation precision around the set rotation centre.
Solution Approach 2:
The invention transitions from a one-dimensional single-point contact (pin or wheel) to a two-dimensional matrix arrangement of multiple contact elements. This dimensional change allows the rotation force to be distributed across a broader area of the metal sheet edge, reducing stress concentration while preserving rotational accuracy.
2Object-affected harmful factors
If a guide pad is used to provide a more extended contact area, then the contact area between the pad and metal sheet edge is increased, but relative sliding occurs that damages the caulked edge geometry and creates sliding friction
Solution Approach 1:
The continuous guide pad is segmented into multiple discrete contact elements arranged in a matrix. This segmentation eliminates the sliding surface while maintaining extended contact area, as each element can rotate independently with the metal sheet edge without relative sliding between the guide element and the metal sheet.
Solution Approach 2:
The guide elements are made dynamic by allowing them to rotate independently rather than sliding against the metal sheet edge. This dynamic rotation eliminates sliding friction while maintaining continuous contact, preserving the caulked edge geometry and reducing harmful friction forces.
3Device complexity
If an invariable geometric shape guide pad is used, then the guide structure is simple, but it does not ensure extended contact zone when metal sheets with different curvature values are processed, reproducing stress concentration problems
Solution Approach 1:
The guide system employs dynamically adjustable elements that can change their configuration based on the metal sheet curvature. The matrix of contact elements can independently adjust their positions and orientations to match different curvature values, ensuring optimal contact zone adaptation without requiring complex variable geometry structures.
Solution Approach 2:
The matrix of standardized contact elements provides universal functionality for handling metal sheets with various curvature values. By combining multiple identical or similar elements in a configurable arrangement, the system achieves adaptability to different curvatures while maintaining structural simplicity and avoiding stress concentration.
Data Source
Figure 1
Figure 2~3
Figure 4~7
AI summary
A device (1) for guiding and directing a metal sheet (2) in a bending machine (3) to form continuously a conical structure, in particular a frustoconical structure, comprises: resting and contrasting means (4; 104; 204) extending along a closed path, and suitable for restingly receiving a longitudinal edge (E) of the metal sheet (2) and contrasting a movement of the edge (E) in a direction that is transverse to a preset advancement trajectory (T) of the metal sheet (2); a supporting body (S) for the resting and contrasting means (4; 104; 204), having at least one oblong lateral portion (5) that is suitable for facing the edge (E) and configured for conforming the resting and contrasting means (4; 104; 204) to the longitudinal profile of the edge (E) so as to obtain an extended zone of contact with said edge and impose resting and contrasting pressure distributed along the edge (E); the resting and contrasting means (4; 104; 204) is movable around the supporting body (S) along the closed path to accompany the edge (E) of the metal sheet by a distributed contact devoid of relative sliding and rolling, so as to impose on the metal sheet (2) the advancement along the desired advancement trajectory (T) to and through the bending machine (3). The corresponding method is also provided.