Press Brake Crowning Control for Uniform Multistage Bending
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Solution Overview
Problem
Existing press brake technologies face challenges in achieving accurate multistage bending of workpieces, particularly in ensuring consistent bending across the width of the workpiece.
Innovation Solution
A press brake system equipped with a die, a punch, a crowning mechanism, and a bending amount measuring device, along with processing circuitry that adjusts the crowning amount based on differences between measured and target bending amounts across the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional press brake performs multistage bending with a die and punch, then the workpiece can be bent to desired shapes, but the bending accuracy varies across the width of the workpiece due to die deformation and crowning effects
Solution Approach 1:
The system performs preliminary measurement of bending amounts at multiple positions before final forming, then pre-adjusts the crowning mechanism to compensate for expected variations. This preliminary action ensures that when the actual bending occurs, the die is already positioned to produce uniform bending across the workpiece width, resolving the accuracy inconsistency issue.
Solution Approach 2:
The bending amount measuring device continuously monitors the bending amount at multiple positions on the workpiece during the bending process. This measurement feedback is sent to the control device, which automatically adjusts the crowning mechanism in real-time to maintain consistent bending accuracy across the entire width of the workpiece, eliminating the variation problem.
Data Source
AI summary
There is provided a press brake that improves bending accuracy of a partial bending method. The press brake includes: a conveying mechanism that intermittently conveys a workpiece; a die; a punch; a crowning mechanism; a bending amount measuring device; and a control device. The control device presses an end portion of the workpiece in a conveying direction by the punch and conveys the workpiece by the conveying mechanism until the pressed portion enters into a measurement range of the bending amount measuring device. The control device drives the crowning mechanism so as to correct a crowning amount in accordance with a difference between a middle bending amount and an end bending amount measured by the bending amount measuring device.