Press Brake Crowning With Eccentric Shafts and Force Multiplication
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Solution Overview
Problem
Press brakes face challenges in achieving downsizing and compactness of actuators while maintaining effective crowning of the lower table, often requiring large hydraulic cylinders that lead to cumbersome maintenance and energy inefficiencies.
Innovation Solution
The implementation of a force-increasing mechanism using a servo motor, eccentric shafts, and toggle mechanisms to transmit increased force for rotating the eccentric shafts, allowing for synchronous operation and reduced actuator size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a hydraulic cylinder is used as an actuator for crowning the lower table, then sufficient force can be applied to curve the central portion upward, but the actuator becomes large in size and cumbersome to maintain
Solution Approach 1:
A force-increasing mechanism is introduced as an intermediary between the motor and the eccentric shaft. This mechanism includes a lever member integrally provided with the eccentric shaft and a link member pivotally connected to the lever member. The link member is pushed or pulled by the actuator to rotate the eccentric shaft, enabling force multiplication without requiring a large actuator.
2Force
If a hydraulic cylinder is used for crowning operations, then the required force can be achieved, but maintenance and management become cumbersome
Solution Approach 1:
The patent replaces the hydraulic cylinder-based mechanical system with a motor-driven force-increasing mechanism. This substitution eliminates hydraulic fluid, seals, and complex hydraulic components that require maintenance, while achieving the same force multiplication effect through mechanical leverage in the link member and lever member system.
3Force
If a hydraulic cylinder is used for crowning, then sufficient force is available, but temperature rise of hydraulic operating oil occurs
Solution Approach 1:
The patent eliminates the hydraulic system entirely by using a motor-driven mechanical force-increasing mechanism. This removes the source of hydraulic oil temperature rise while maintaining the ability to generate sufficient crowning force through the mechanical advantage provided by the link member and lever member configuration.
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 configuration enables a compact and energy-efficient actuator system that effectively performs crowning operations, enhancing the precision and efficiency of the press brake's bending process.
Implementation Method 1
a force-increasing mechanism for transmitting an output of an actuator to each eccentric shaft with a force increased
Implementation Method 2
performing the crowning by rotating an eccentric shaft
Data Source
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AI summary
Provided are a crowning method and a press brake wherein, when crowning with a lower table is performed, the crowning is performed while rotating eccentric shafts using a force-increasing mechanism. In this press brake crowning method a front plate 11 and a back plate 13 are provided respectively at the front and back of a lower table 5, which is supported by left and right side frames 3L and 3R in a press brake 1, and crowning is performed while rotating eccentric shafts 23, which are provided in the lower table 5 with intervals therebetween in the left-right directions. A force-increasing mechanism 41 is provided between each eccentric shaft 23 and an actuator 31 for rotating each eccentric shaft 23, the output of the actuator 31 is increased by the force-increasing mechanism 41 and is transmitted to each eccentric shaft 23, and each eccentric shaft 23 is rotated, thereby performing crowning.