Transfer Bar Timing Switching for Stable Servo Press Motion
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Solution Overview
Problem
In conventional transfer press systems using servo press machines, the motion of the transfer device is affected by the press angle, making it difficult to set a stable switching point for timing switches, especially when the servo press machine and transfer device operate with different phase signals.
Innovation Solution
A transfer device that sets a switching point on its trajectory based on a transfer individual phase signal synchronized with a master phase signal, allowing the user to designate a distance from a reference point for the switching point, and outputs a timing signal when the transfer bar reaches that point, enabling independent control of the transfer motion without relying on the press angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transfer device operates in conjunction with the press angle, then the transfer motion is synchronized with the press machine, but the transfer motion becomes unstable due to acceleration/deceleration and rotation direction changes of the press
Solution Approach 1:
The patent separates the control of the transfer device from the press machine's phase signals. The transfer device uses its own independent phase signal that is synchronized with the master phase signal, rather than being directly coupled to the press angle. This segmentation allows the transfer motion to be controlled independently, avoiding the instability caused by press machine acceleration and deceleration.
Solution Approach 2:
The patent introduces a master phase signal as an intermediary between the press machine and the transfer device. Both the press machine and transfer device synchronize their individual phase signals with this master phase signal, rather than directly linking them. This intermediary approach allows synchronization while maintaining independent control of the transfer motion.
2Ease of operation
If the switching point is set based on the press angle, then the timing switch can be controlled, but the switching point position changes when transfer motion parameters change
Solution Approach 1:
The patent makes the switching point setting dynamic by allowing it to be defined as a fixed distance from a reference point on the transfer bar's trajectory, rather than being fixed to a specific press angle. When transfer motion parameters change, the system automatically recalculates the switching point position based on the new trajectory, maintaining both ease of operation and precision.
3Adaptability or versatility
If the transfer device uses servo motor for independent control, then complex motions can be achieved, but the transfer motion becomes unstable when linked to press angle
Solution Approach 1:
The patent segments the control system into independent press machine control and transfer device control, each with its own phase signal synchronized to a master phase signal. This allows the servo transfer device to execute complex motions independently without being destabilized by press machine operations.
Solution Approach 2:
The system uses phase signal synchronization as a feedback mechanism. The transfer device's phase signal is continuously synchronized with the master phase signal, providing feedback that maintains stable transfer motion even when performing complex sequences of movements that would otherwise be unstable when directly linked to press angle.
Data Source
AI summary
A transfer device transfers a workpiece by a transfer motion which is based on a transfer individual phase signal synchronized with a master phase signal, and includes: a setting unit that sets a point on a trajectory of a transfer bar as a switching point of a timing switch, the point on the trajectory being separated from a reference point on the trajectory by a designated distance designated by a user, and the trajectory being based on the transfer motion; and a signal output unit that outputs a timing signal to an external device at a timing when the transfer bar reaches the switching point.