Servo Press Pendulum Motion Synchronization via Virtual Angle
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Solution Overview
Problem
The operation of servo press systems using pendulum motion is hindered by difficulties in determining the relative relationship between slide position and crank shaft rotation angle, leading to inefficient operation, increased risk of interference, and potential device deformation or breakage due to discontinuous signal detection during motion direction inversion.
Innovation Solution
A servo press system that generates and switches between first and second transfer operation instruction information based on the current motion state of the press element, ensuring continuous transfer motion by determining whether the motion is within a motion direction inversion region, using virtual rotation angles to stabilize synchronization between the press and transfer devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pendulum motion is used to increase press speed and productivity, then productivity is improved, but the operation becomes troublesome and interference risk increases due to difficulty in determining slide position relative to crank shaft rotation angle
Solution Approach 1:
The patent introduces a virtual rotation angle as an intermediary parameter that mediates between the actual crank shaft rotation and the slide position. This virtual angle serves as a simplified reference that linearly corresponds to slide position (0° at top dead center, 180° at bottom dead center), making it easier to determine timing signals and synchronization without dealing with the complex non-linear relationship in actual pendulum motion mode.
Solution Approach 2:
The patent transforms the physical parameter from actual crank shaft rotation angle to virtual rotation angle. This parameter transformation simplifies the operational interface by creating a linear, intuitive scale where slide position can be directly read, eliminating the need for operators to interpret complex angular relationships during pendulum motion.
2Ease of operation
If individual control method is used for press and transfer device, then ease of operation is improved, but it becomes difficult to increase operation speed and prevent interference
Solution Approach 1:
The patent implements a feedback mechanism where the virtual rotation angle from the press (master device) is continuously monitored and used to generate transfer operation instructions for the transfer device (slave device). This feedback loop ensures synchronized operation while maintaining individual control capabilities, allowing high-speed operation without interference.
3Measurement precision
If signal detection is performed during motion direction inversion in pendulum motion, then synchronization information is obtained, but discontinuous signals occur leading to potential device deformation or breakage
Solution Approach 1:
The patent extracts the essential synchronization information (slide position and timing) from the complex pendulum motion and represents it through the virtual rotation angle parameter. This extraction allows synchronization signals to be generated based on virtual angle thresholds rather than actual instantaneous position during inversion, avoiding discontinuous signals and protecting the device.
Data Source
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Figure 3(A)~3(E)
AI summary
A servo press system in which a transfer operation of a servo transfer device (50) implements a transfer operation by utilizing first transfer operation instruction information that is generated depending on a mechanical motion state of a press element (12, 16) of a servo press (10) or second transfer operation instruction information that is generated independently of the mechanical motion state of the press element (10) during a press operation using a pendulum motion.