Press Brake Lower Table Slits for Uniform Bending Accuracy
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Solution Overview
Problem
Existing press brakes face challenges in maintaining uniform closing intervals between the upper and lower tables during bending, leading to decreased longitudinal accuracy regardless of the workpiece thickness.
Innovation Solution
A press brake design featuring an upper table and a lower table with symmetrically extending slits, where the end portions of the slits are opened and equipped with elastic members and movable blocks that can switch between load-receiving and released states, allowing for adjustable deflection control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lower table is made rigid to maintain structural stability, then the strength and stability of the lower table are improved, but the closing interval between the upper and lower tables becomes non-uniform during bending, decreasing longitudinal accuracy
Solution Approach 1:
The lower table is segmented by forming slits that divide the table structure into multiple regions. These slits allow controlled deflection of the lower table during bending operations, enabling the table to adapt its shape to maintain uniform closing interval while preserving overall structural integrity through the segmented design.
Solution Approach 2:
The rigidity parameter of the lower table is changed locally by introducing slits with specific geometries. The slits modify the structural parameters of the lower table, allowing it to transition from a completely rigid state to a controlled flexible state that can deflect appropriately during bending while maintaining sufficient strength.
2Manufacturing precision
If the lower table is made flexible to maintain uniform closing interval, then the longitudinal accuracy of bending is improved, but the strength and stability of the lower table are reduced
Solution Approach 1:
The lower table is segmented by forming slits that divide the table structure into multiple regions. These slits allow controlled deflection of the lower table during bending operations, enabling the table to adapt its shape to maintain uniform closing interval while preserving overall structural integrity through the segmented design.
Solution Approach 2:
The rigidity parameter of the lower table is changed locally by introducing slits with specific geometries. The slits modify the structural parameters of the lower table, allowing it to transition from a completely rigid state to a controlled flexible state that can deflect appropriately during bending while maintaining sufficient strength.
3Manufacturing precision
If fixed blocks are provided in the slits to adjust deflection, then the closing interval uniformity is improved, but the device complexity increases due to additional components
Solution Approach 1:
The complex fixed block adjustment mechanism is extracted and replaced by a simpler elastic member system. The elastic members are directly installed in the slits of the lower table, eliminating the need for separate fixed blocks and their associated adjustment mechanisms, thereby reducing device complexity while maintaining deflection control functionality.
Solution Approach 2:
The elastic members automatically adjust to the bending load conditions without requiring external adjustment mechanisms. The elastic members self-regulate the deflection of the lower table based on the applied bending forces, eliminating the need for complex fixed block adjustment systems and reducing overall device complexity.
4Manufacturing precision
If coil springs are fixedly provided at the slits to adjust deflection, then the closing interval uniformity is improved, but the device complexity and space requirement increase
Solution Approach 1:
The complex fixed block adjustment mechanism is extracted and replaced by a simpler elastic member system. The elastic members are directly installed in the slits of the lower table, eliminating the need for separate fixed blocks and their associated adjustment mechanisms, thereby reducing device complexity while maintaining deflection control functionality.
Solution Approach 2:
The elastic members automatically adjust to the bending load conditions without requiring external adjustment mechanisms. The elastic members self-regulate the deflection of the lower table based on the applied bending forces, eliminating the need for complex fixed block adjustment systems and reducing overall device complexity.
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 design ensures a substantially uniform closing interval along the lateral direction, significantly improving the longitudinal accuracy of bending for workpieces of varying thicknesses.
Implementation Method 1
an elastic member provided at the end portion of each of the slits on the outer side in the lateral direction and configured to be switchable between a load-receiving state for receiving a bending load acting on the lower table and a released state in which the load-receiving state is released
Data Source
AI summary
A press brake is equipped with an upper table provided so as to be vertically movable at an upper part of a main frame and holding a punch tool on a lower side thereof, and a lower table provided at a lower part of the main frame and holding a die tool on an upper side thereof. A pair of slits extending symmetrically in a lateral direction are formed in the lower table, and an end portion of each slit on an outer side in the lateral direction is opened. An elastic member is provided in the end portion of each slit on the outer side in the lateral direction. The elastic member is configured to be switchable between a load-receiving state for receiving a bending load acting on the lower table and a released state in which the load-receiving state has been released.