Press Brake Table Slots with Adjustable Stoppers for Parallel Deformation
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Solution Overview
Problem
Conventional bending presses face challenges in achieving parallel deformation of table edges across varying metal sheet lengths and asymmetric positions, leading to inaccurate bending results due to concave deformations, especially when dealing with long or off-center sheets.
Innovation Solution
The implementation of a bending press system with symmetric slots and stoppers that adjust for clearance and elastic deformation, allowing controlled approach of slot edges to achieve parallel deformation of table edges, regardless of sheet length or position, ensuring high bending accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional slots are provided in the lower table to control deformation, then parallel deformation is achieved for sheets equal to table length, but concave deformation occurs for shorter sheets
Solution Approach 1:
The slot configuration is made variable through movable members that can adjust their positions within the slots. This allows the deformation control mechanism to adapt dynamically to different sheet lengths, transforming a static slot system into a dynamic one that maintains parallel deformation across various working conditions.
Solution Approach 2:
The invention changes the parameters of the slot system by introducing movable members with adjustable positions. This allows modification of the effective slot length and position depending on the sheet being bent, enabling the same physical slots to serve multiple functions for different sheet lengths.
2Adaptability or versatility
If movable members are added to slots to adjust positions, then adaptability to different sheet lengths is improved, but device complexity increases
Solution Approach 1:
The movable members are designed to be positioned and adjusted by the operator directly during setup, without requiring complex automated control systems. The mechanism serves itself by allowing manual adjustment to the required position for each sheet length, eliminating the need for additional motors, sensors, or control electronics.
3Manufacturing precision
If the lower table is made flexible to accommodate short sheets, then bending accuracy for short sheets is improved, but structural stability of the table deteriorates
Solution Approach 1:
Instead of making the entire lower table flexible, the invention introduces flexibility only in the specific regions where slots are provided. The rest of the table structure remains rigid and stable, maintaining overall structural integrity while allowing localized deformation control where needed for accurate bending of short sheets.
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 solution enables parallel deformation of table edges over a wide range of sheet lengths and positions, resulting in improved bending accuracy and consistency, even for difficult-to-bend materials, by adjusting stopper positions and clearances to compensate for stress and elastic deformation.
Implementation Method 1
each stopper presenting a predetermined coefficient of elasticity; each stopper defining in the zone of the slot in which it is located, a possibility of controlled approach of the two edges of the slot under the effect of the load applied to the table including the slots, said approach resulting from at least one of two parameters consisting in clearance j initially provided by said stopper in the slot in the absence of an applied load and the elastic deformation of said stopper
Data Source
AI summary
The present invention relates to a bending press comprising an upper table (130) and a lower table (132) placed edge-to-edge in the vertical direction, with one of the tables being movable relative to the other in the vertical direction, and with one of the tables presenting slots (134, 136) that are placed symmetrically relative to the midplane (P′P). Each slot has an open outside end and comprises a first slot portion (135a, 137a) and a second slot portion (135b, 137b) that is situated on the inside relative to the first slot portion and that is connected thereto, the shapes of said slot portions being such that the stiffness of the table portion situated between the slot and the tool fastener is greater between the first slot portion and the tool fastener than between the second slot portion and the tool fastener. At least one element (180) for adjusting the flexing of said table is disposed in the first slot portion.