Workpiece Transport Control With Deceleration Lines for Dense Flow
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Solution Overview
Problem
In machine systems performing operations on moving workpieces, there is a need to suppress unnecessary transport control, particularly when workpieces pass through a transport stop line in an incomplete operation state, leading to repeated stopping and restarting, especially when workpieces are densely crowded near the upstream side of the transport stop line.
Innovation Solution
A machine system with a transport control section that reduces the transport speed of workpieces when they pass through a transport deceleration line in an incomplete operation state and increases the speed after the operation on workpieces between the operation limit line and transport acceleration line has completed, using sensors to determine the state and control the speed accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the transport speed is controlled to stop workpieces at the transport stop line in incomplete operation state, then the workpiece positioning accuracy is improved, but the transport efficiency deteriorates due to repeated stopping and restarting
Solution Approach 1:
The transport control section performs preliminary deceleration of workpieces at the transport deceleration line before they reach the transport stop line. This preliminary action ensures that workpieces approach the stop line at a reduced speed, improving positioning accuracy while avoiding the need for complete stops and subsequent restarts, thereby maintaining transport efficiency
Solution Approach 2:
The system dynamically adjusts transport speed based on the operational state of machines. When workpieces are in incomplete operation state, the control section applies deceleration; when operations are complete, acceleration is applied. This dynamic speed adjustment optimizes both positioning accuracy and transport efficiency
2Manufacturing precision
If the transport speed is reduced when workpieces are densely crowded near the upstream side of the transport stop line, then the workpiece positioning accuracy is improved, but the transport efficiency deteriorates due to repeated acceleration and deceleration
Solution Approach 1:
The transport control section applies deceleration at the transport deceleration line before workpieces reach the transport stop line, ensuring they are already at reduced speed when densely crowded. This preliminary speed reduction improves positioning accuracy while minimizing the need for repeated acceleration and deceleration cycles, reducing time loss
Solution Approach 2:
The control section continuously monitors the operational state of machines and adjusts transport speed accordingly. When workpieces are in incomplete operation state or densely crowded, deceleration is applied; when operations are complete, acceleration is applied. This feedback-based control optimizes both positioning accuracy and transport time
Data Source
AI summary
A machine system includes a transport control section which controls transport of a workpiece based on a transport deceleration line provided upstream of an operation limit line of a machine in a direction of travel of the workpiece and a transport acceleration line provided upstream of the transport deceleration line, wherein the transport control section reduces a transport speed of the workpiece when the workpiece passes through the transport deceleration line in an incomplete operation state and increases the transport speed of the workpiece after the operation on the workpiece present between the operation limit line and the transport acceleration line has completed.