Transfer Press Motion Phasing for 3D Interference Avoidance
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Solution Overview
Problem
In transfer presses using servo motors, interference between the press machine and transport device occurs due to complex changes in pressing and transfer motions, leading to inefficiencies and inaccurate interference detection in two-dimensional coordinate systems, which can result in unnecessary interference determination during operation.
Innovation Solution
A motion setting method that creates a three-dimensional operating curved surface based on the relative distance of the retainer to a standard upper die, determines if this surface is within an interference region, and adjusts the relative phase of the transfer motion to prevent interference, using a phase adjustment unit and deceleration adjustments to optimize production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-dimensional coordinate system is used to represent interference line diagrams, then the device complexity is reduced, but the measurement precision of interference detection deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional coordinate system to a three-dimensional coordinate system for representing interference line diagrams. The third dimension (vertical axis) represents the stroke position of the press machine, while the horizontal axes represent the transfer feed stroke and transfer clamp stroke. This dimensional expansion enables accurate detection of interference by visually representing the spatial relationship between the press machine and transfer device throughout the entire stroke cycle, resolving the false interference detection problem inherent in two-dimensional representations.
2Productivity
If the transfer press operates with complex pressing and transfer motions to improve productivity, then the production efficiency is improved, but the reliability of interference-free operation deteriorates
Solution Approach 1:
The patent creates interference line diagrams before actual operation to predict potential interference. By plotting the operational interference line diagram against the reference interference line diagram in advance, the system identifies interference risks before they occur during high-speed operation. This preliminary analysis allows operators to adjust motion parameters or phase relationships to eliminate interference risks while maintaining complex, high-productivity pressing and transfer motions.
Solution Approach 2:
The patent establishes a feedback mechanism where the operational interference line diagram is compared with the reference interference line diagram. When interference is detected in the three-dimensional representation, the system provides feedback that allows adjustment of transfer motion parameters or press machine timing. This closed-loop approach enables the system to maintain reliable interference-free operation even when operating with complex motions optimized for high productivity.
Data Source
Figure 1
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Figure 3(A)~3(B)
AI summary
A transfer press includes a press machine that moves a slide up and down in accordance with pressing motion, and a transport device that moves a retainer in accordance with transfer motion to transport a workpiece. The transfer press includes a creation unit, a determination unit, and a phase adjustment unit. The creation unit creates a three-dimensional operating curved surface based on the provisionally set pressing motion and the provisionally set transfer motion. The determination unit compares a standard upper die interference curved surface with the operating curved surface in the same three-dimensional coordinate system to determine whether the operating curved surface is present within an interference region of the standard upper die interference curved surface. The phase adjustment unit changes a relative phase of the transfer motion relative to the pressing motion when the operating curved surface is present within the interference region.