NG Substrate Routing in Circuit Board Work Systems
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Solution Overview
Problem
In substrate work systems, the delayed movement of non-conforming substrates (NG substrates) to a retracted position leads to inefficiencies in work timing and productivity, as they are not moved to the retracted position promptly, causing delays in starting work on these substrates.
Innovation Solution
The system conveys NG substrates to the downstream working machine earlier than OK substrates, allowing for rapid movement to the retracted position and enabling immediate work on the NG substrates, with notification to operators before conveyance to prepare for work, thus enhancing work efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If circuit substrates are conveyed through two paths with each working machine including a pair of conveyance devices, then productivity is improved, but the timing of discharging NG substrates to the retracted position is delayed
Solution Approach 1:
The system dynamically switches between two conveyance paths based on substrate inspection results. OK substrates follow the normal path through both conveyance devices, while NG substrates are dynamically routed to the retracted position via the second conveyance device, optimizing both productivity and response time for defect handling
Solution Approach 2:
The conveyance system is segmented into multiple independent paths: a normal conveyance path for OK substrates and a separate retracted position path for NG substrates. This segmentation allows simultaneous handling of different substrate types without mutual interference, resolving the timing delay problem while maintaining high productivity
2Ease of operation
If NG substrates are moved to the retracted position, then work on NG substrates can be performed, but work efficiency degrades when the timing is delayed
Solution Approach 1:
The system performs preliminary identification and routing of NG substrates to the retracted position immediately after inspection, before they enter the main production flow. This preliminary action ensures that NG substrates are prepared for rework without delaying the overall production process, maintaining both ease of operation and high work efficiency
Data Source
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AI summary
In a work system for substrates 10 which includes plural working machines 12, 14, 16, 18, and 20 conveying circuit substrates through two paths and in which the circuit substrates are conveyed through the two paths from the working machine disposed upstream out of the plural working machines to the working machine disposed downstream, a circuit substrate of which the work result is not good is conveyed to the downstream working machine earlier than the circuit substrate of which the work result is good in a state in which the circuit substrate of which the work result is good and the circuit substrate of which the work result is not good are able to be conveyed to the downstream working machine 20 by the upstream working machine 18. Accordingly, it is possible to perform work on the circuit substrate of which the work result is not good earlier and thus to enhance work efficiency of the work system and the working machine.