Workpiece Unloading Order Control for Stable Reversal Cycle Time
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Solution Overview
Problem
The existing workpiece removal processes are inefficient when reversing the front and back of workpieces, leading to longer cycle times and potential interference with subsequent processes.
Innovation Solution
A workpiece removal device with a control system that detects the current posture of workpieces, calculates the change in posture compared to the setting posture, identifies priority removal candidates based on a threshold value, and instructs the removal device to prioritize workpieces with minimal posture change, thereby stabilizing cycle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If workpiece reversal operation is performed continuously, then the workpiece can be set in the jig with correct orientation, but the cycle time becomes long and process efficiency deteriorates
Solution Approach 1:
The control device predicts the posture of workpieces before removal and identifies candidates that require reversal in advance. By pre-processing and sorting workpieces based on their predicted posture, the system prepares workpieces in an optimal order, eliminating the need for continuous reversal operations during the removal process and thereby reducing cycle time while ensuring correct orientation.
2Reliability
If workpiece reversal operation is performed continuously, then the workpiece can be set in the jig with correct orientation, but the cycle time for that period becomes long
Solution Approach 1:
The control device predicts the posture of workpieces before removal and identifies candidates that require reversal in advance. By pre-processing and sorting workpieces based on their predicted posture, the system prepares workpieces in an optimal order, eliminating the need for continuous reversal operations during the removal process and thereby reducing cycle time while ensuring correct orientation.
Solution Approach 2:
The system performs reversal operations periodically rather than continuously by batching workpieces that require reversal together. The control device identifies multiple workpieces needing reversal, sorts them as a group, and processes them in sequence, allowing the removal device to operate efficiently without frequent interruptions for individual reversal operations.
Data Source
AI summary
The purpose of the present invention is to provide a workpiece unloading device that can stabilize cycle time even when work for reversing a workpiece is involved. A workpiece unloading system comprises a workpiece unloading device for unloading a workpiece, and a control device for setting workpiece unloading order. The control device comprises: a storage unit that stores a set posture representing a posture of a workpiece when the workpiece is set on a jig; a current posture detection unit that detects a current posture representing the current posture of the workpiece; a change amount calculation unit that calculates a change amount between the set posture and the current posture; an unloading candidate identification unit that compares the change amount with a threshold value, and identifies, on the basis of the comparison result, a workpiece as an unloading candidate with priority; and an unload instruction unit that outputs, to the workpiece unloading device, a first instruction to unload the workpiece as the unloading candidate with priority.