Press Slide Motion Profile for Variable Cycle Time Control
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Solution Overview
Problem
Existing press lines face interference issues when reducing speed to adjust production volume while maintaining molding accuracy, requiring significant modifications to the control program for both press devices and feeder devices.
Innovation Solution
A motion generation device and method that allows for changing the speed of a press line by generating a second motion with a different cycle time from a first motion, maintaining the same motion from top dead center to the end position of the molding region and equal speed at top dead center, using a servomotor to move the slide in an up and down direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cycle time is extended to reduce the operating speed of the press line, then the production volume can be adjusted to a lower level, but interference between the press devices and the feeder device occurs
Solution Approach 1:
The motion cycle is segmented into multiple regions: a first region (top dead center to conveyance region) where the slide maintains original motion characteristics, and a second region (conveyance region to bottom dead center) where speed adjustments are made. This segmentation allows the press device to operate at reduced overall speed while maintaining proper timing in critical regions, preventing interference with the feeder device.
Solution Approach 2:
Different regions of the motion cycle are assigned different quality characteristics. The first region maintains the original motion profile to ensure proper synchronization with the feeder device, while the second region allows speed reduction to achieve lower production volume. This local differentiation resolves the contradiction between reduced productivity and avoidance of interference.
2Productivity
If the cycle time is extended to reduce the operating speed of the press line, then the production volume can be adjusted, but major modification of the control program is required
Solution Approach 1:
The control system dynamically adjusts the motion profile within the second region based on the selected production volume. By using a servomotor to continuously control the slide speed throughout the cycle, the system can achieve different production volumes without requiring structural modifications to the control program, only parameter adjustments in the second region of the motion cycle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy adjustment of press line speed without interfering with feeder devices while preserving molding accuracy, eliminating the need for major program modifications.
Implementation Method 1
a servomotor configured to move the slide reciprocally in an up and down direction
Data Source
AI summary
A motion generation device is configured to generate motion of a slide of a press device including the slide to which an upper die is attached, a bolster on which a lower die is placed, and a servomotor configured to move the slide reciprocally in the up and down direction. The motion generation device includes a motion generation section. The motion generation section is configured to generate a derivative motion of the slide at a cycle time different from the cycle time of the standard motion of the slide, such that the derivative motion includes the same motion as a first region of the standard motion including at least from top dead center to the end position of the molding region, and the speed of the slide at top dead center of the derivative motion is the same as the speed of the standard motion.