Press Angle Control Device for Load Variation Error Reduction
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Solution Overview
Problem
Existing press angle control methods in press machine facilities are prone to significant errors due to variations in press load, which can cause discrepancies between synchronized press machines, leading to inaccurate angle control.
Innovation Solution
A press angle control device with a reference value output unit, press angle detection unit, speed command unit, driving unit, and correction unit, where the correction unit adjusts the command speed value or press angle reference value to maintain a predetermined range between the reference and actual press angles, independent of load variations across machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If press angle synchronization control is carried out on the basis of the press angle of the master press machine as a synchronization reference, then the press angles of multiple press machines can be synchronized, but when the actual motor speed of the master press machine varies due to press load increasing, the variation acts on the slave press machine causing press angle difference and large control error
Solution Approach 1:
The patent divides the press angle control into independent units for each press machine, with each machine having its own press angle detection unit and speed command unit. This segmentation allows each machine to control its own press angle independently based on its actual press angle detection, rather than relying on the master machine's press angle reference, thereby eliminating the propagation of load variations across machines.
Solution Approach 2:
The patent introduces a feedback mechanism where each press machine's actual press angle is detected and fed back to its speed command unit. The speed command unit then adjusts the command speed value based on the difference between the press angle reference value and the actual press angle detection value, creating a closed-loop control system that compensates for load variations and maintains synchronization accuracy.
2Stability of the object's composition
If phase difference control is carried out on the basis of the upstream press machine as a reference to uniformly maintain the press angle difference, then the press angle difference can be maintained, but when the actual motor speed of the upstream press machine varies due to press load increasing, the variation acts on the downstream press machine causing large press angle difference variation and large control error
Solution Approach 1:
The patent assigns independent control authority to each press machine, with each machine's speed command unit independently adjusting its command speed value based on its own press angle detection. This eliminates the hierarchical dependency where downstream machines rely on upstream machine speed variations, allowing each machine to maintain stable press angle differences without propagating load variations.
Solution Approach 2:
The patent dynamically adjusts the command speed value parameter for each press machine based on real-time press angle detection. By changing the command speed value in response to actual press angle deviations, the system maintains stable press angle differences even when load conditions vary, preventing large control errors.
3Measurement precision
If the command speed value is adjusted to compensate for press angle differences, then press angle synchronization can be maintained, but the control system becomes more complex requiring additional detection and correction units
Solution Approach 1:
The patent designs each press machine's control unit to perform multiple functions: press angle detection, command speed value generation, and speed control. By making the control system modular and universal, each machine can independently perform these functions without requiring complex external control systems, thereby maintaining precision while limiting the increase in overall system complexity.
Data Source
AI summary
A device for reducing the press angle control error caused by press load variation, where the device includes: a reference value output unit that outputs a press angle reference value, a press angle detection unit, a speed command unit, and a driving unit. The press angle detection unit detects a press angle of the corresponding press machine and outputs a press angle detection value. The speed command unit outputs a command speed value of a motor of the corresponding press machine based on the press angle reference value and the press angle detection value. The driving unit controls the motor speed of the corresponding press machine based on the command speed value. The device further includes a correction unit that corrects the press angle reference value or the command speed value so the difference between the press angle reference value and the press angle is within a predetermined range.