Press Machine Bottom Dead Center Position Correction
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Solution Overview
Problem
Conventional press machines with actuator raising/lowering types experience abrupt and excessive fluctuations in the bottom dead center position due to the actuator's movement, leading to instability in the crimping process and reduced product precision, especially when the actuator is raised or lowered, causing crimping pressure issues and potential overload on the press machine.
Innovation Solution
A press machine equipped with a bottom dead center position correction control section that adjusts the actual bottom dead center position based on detected positional data, using a selected bottom dead center position setting and switching mechanism to stabilize the position during both lowering and raising operations, allowing for precise control without the need for mechanical stoppers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the actuator is raised or lowered during press operation, then the workpiece support unit can be positioned for ejecting or returning to press working position, but the bottom dead center position fluctuates abruptly and excessively
Solution Approach 1:
The control unit predicts the bottom dead center position fluctuation that will occur when the actuator is raised or lowered, and performs correction in advance by adjusting the slide position before the actuator operation begins. This preliminary correction prevents the fluctuation from affecting the actual bottom dead center position during workpiece ejection or return operations.
Solution Approach 2:
The control unit continuously monitors the actual bottom dead center position and compares it with the target position, then automatically adjusts the slide position to eliminate any deviation. This closed-loop feedback control ensures that the bottom dead center position remains stable even when the actuator is raised or lowered during press operation.
2Manufacturing precision
If the bottom dead center position is corrected using conventional methods, then position accuracy can be improved, but mechanical stoppers are required which increase device complexity
Solution Approach 1:
The invention replaces the mechanical stopper-based correction method with a control unit that performs automatic position correction through electronic control of the slide adjusting mechanism. This substitution eliminates the need for mechanical stoppers and their associated complexity while achieving the same or better position accuracy through software-based prediction and feedback control.
3Productivity
If the press speed is increased to improve productivity, then manufacturing output increases, but the bottom dead center position becomes lower due to increased downward inertial force
Solution Approach 1:
The control unit continuously monitors the bottom dead center position and automatically adjusts the slide position to compensate for the downward shift caused by increased press speed. This real-time feedback control maintains position accuracy regardless of the press speed, allowing high-speed operation without sacrificing precision.
Solution Approach 2:
The control unit dynamically adjusts the slide position parameter based on the detected bottom dead center position deviation. When press speed increases cause the bottom dead center position to shift, the control unit modifies the slide position parameter to counteract this shift, thereby maintaining the intended bottom dead center position across varying press speeds.
Data Source
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AI summary
A press machine is peovided with a bottom dead center position correction control section, a selected lower bottom dead center position setting section, and a bottom dead center position switching section. The bottom dead center position correction control section is configured to perform, based on the selected bottom dead center position after the switching and the detected bottom dead center position, positional correction so that the actual bottom dead center position of the slide is adjusted to the selected bottom dead center position.