Press Machine Slide Speed Control for Error Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing press machine technology decelerates the slide before error detection, leading to decreased productivity due to premature deceleration.
Innovation Solution
A press machine with a slide, drive unit, detection unit, speed control unit, and stoppage determination calculation unit that determines abnormality signals at the deceleration start point and performs deceleration control to stop the slide at a set point, allowing normal operation to continue without deceleration when no abnormality is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deceleration control is started at a position higher than the setting error detection position, then the slide can be forced to stop when an error is detected, but the productivity decreases due to the premature deceleration
Solution Approach 1:
The patent applies dynamics by making the deceleration start position variable rather than fixed. The control unit dynamically adjusts the deceleration start position based on whether an error is detected: when no error is detected, the deceleration start position is set to the lower position (setting error detection position) to maintain high productivity; when an error is detected, the deceleration start position is set to the higher position to ensure safe stopping. This dynamic adjustment resolves the contradiction between reliability and productivity.
2Reliability
If the slide is forced to stop at a higher position for error detection, then safety is improved, but the pressing operation is interrupted more frequently leading to productivity loss
Solution Approach 1:
The patent applies parameter changes by modifying the deceleration start position parameter based on error detection status. The control unit changes this parameter dynamically: using the lower position parameter (setting error detection position) during normal operation to maintain productivity, and switching to the higher position parameter when errors are detected to ensure safety. This parameter change approach allows the system to optimize between safety and productivity based on real-time conditions.
Data Source
AI summary
A drive unit drives a slide which vertically reciprocates for pressing the workpiece. A detection unit detects positional information about the slide. A speed control unit controls the speed of the slide by the drive unit, based on motion information defining operation of the slide. A stoppage determination calculation unit sets a deceleration start point at which deceleration of the slide is to be started, based on the motion information and a set point at which the slide is to be forced to stop. A speed control unit determines whether an abnormality signal regarding transportation of the workpiece is input, when the slide reaches the deceleration start point based on the positional information about the slide detected by the detection unit. The speed control unit performs deceleration control for the slide so that the slide is stopped at the set point, when determining that the abnormality signal is input.