Press Machine Controller 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 during operations, leading to reduced precision and quality of products due to disturbances caused by the actuator's raising and lowering movements, which are not effectively addressed by existing bottom dead center position correcting devices.
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 a preset target position, using selected lower and higher bottom dead center positions set according to the actuator's operations, to prevent abrupt changes and maintain stability, even without mechanical stoppers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the actuator lowers the workpiece support unit by a predetermined distance to eject the workpiece, then the workpiece can be effectively ejected from the die, but the bottom dead center position of the slide fluctuates abruptly and excessively
Solution Approach 1:
The patent applies dynamics by making the target bottom dead center position variable rather than fixed. The control device dynamically adjusts the target position based on the actuator's operation state, switching between a first target position during actuator movement and a second target position during stable operation. This dynamic adjustment allows the system to accommodate the actuator's lowering action while maintaining overall bottom dead center position stability.
Solution Approach 2:
The patent changes the parameter of the target bottom dead center position based on the operational state of the actuator. When the actuator is lowering the workpiece support unit, the target position is set to a first value that accounts for the expected position change. When the actuator is stable, the target position switches to a second value. This parameter change strategy allows the system to maintain precision despite the actuator's movement.
2Ease of operation
If the actuator raises the workpiece support unit back to the press working position, then the workpiece support unit is reset for the next operation, but the bottom dead center position rises abruptly and excessively
Solution Approach 1:
The control device dynamically adjusts the target bottom dead center position based on the actuator's raising operation. When the actuator is raising the workpiece support unit, the target position is set to a first target position that anticipates the position change. Once the actuator stabilizes at the press working position, the target position switches to a second target position. This dynamic switching prevents abrupt position rises while maintaining operational efficiency.
Solution Approach 2:
The patent changes the target bottom dead center position parameter according to the actuator's operational phase. During the raising operation, one parameter value is used; during the stable phase, another parameter value is used. This parameter change approach allows the system to accommodate the actuator's movement without causing excessive bottom dead center position fluctuations.
3Manufacturing precision
If conventional bottom dead center position correcting devices are used, then the bottom dead center position can be corrected, but they cannot effectively address the abrupt fluctuations caused by actuator raising and lowering operations
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual bottom dead center position and comparing it with the target position. The control device calculates the position deviation and uses this feedback to adjust the slide's bottom dead center position. This feedback mechanism is enhanced by dynamically switching target positions based on actuator operation state, allowing effective correction of abrupt fluctuations that conventional fixed-target systems cannot handle.
Solution Approach 2:
The control device performs preliminary action by anticipating the bottom dead center position changes that will occur during actuator operations. Before the actuator moves, the target position is adjusted to account for the expected position change. This preliminary adjustment prevents the abrupt fluctuations from occurring in the first place, rather than merely correcting them after they happen.
Data Source
AI summary
A press machine is provided 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.