Workpiece Processing System Timing Control
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Solution Overview
Problem
Variations in processing duration at one processing chamber can lead to unstable workpiece quality and potential operational stoppages in high-cycle operations, as they affect the timing and preparation time in subsequent processing chambers, especially during high-temperature treatments like rapid carburizing.
Innovation Solution
A workpiece processing system with a control device that sets a reference processing step as the origin for timing control across processing chambers, allowing for predetermined processing and conveyance durations, ensuring consistent processing even with variations in individual chamber times, and includes a warning system for abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the processing duration at each processing chamber is managed independently, then the processing can be performed in each chamber, but variations in processing duration cause changes in process start time in other chambers, leading to unstable workpiece quality and operational disruptions
Solution Approach 1:
The control device calculates and determines the start time of representative processing in each processing chamber in advance, based on the total processing cycle time and the durations of all processing steps. This preliminary timing determination ensures that even if actual processing durations vary, the system maintains synchronized operation across all chambers by having pre-planned start times for each chamber's representative processing step
Solution Approach 2:
The control device monitors the actual processing duration in each chamber and uses this information to adjust and determine the start time of representative processing in subsequent chambers. This feedback mechanism ensures that timing variations in one chamber are compensated for by adjusting the timing in other chambers, maintaining overall system synchronization and stable workpiece quality
2Manufacturing precision
If the processing duration is extended to ensure adequate processing time, then the processing quality can be maintained, but the cumulative standby time in following chambers increases, reducing overall productivity
Solution Approach 1:
The control device calculates the optimal start time for representative processing in each chamber in advance, taking into account the total cycle time and individual chamber durations. This allows the system to minimize standby times while ensuring each chamber receives adequate processing time, thereby maintaining both quality and productivity
Solution Approach 2:
The system dynamically adjusts the start time of representative processing in each chamber based on actual processing durations and chamber-specific requirements. This dynamic timing adjustment allows the system to optimize the balance between processing quality and operational efficiency, reducing cumulative standby time while maintaining necessary processing durations in each chamber
Data Source
AI summary
A workpiece processing system and method to process a workpiece in processing chambers in order, in which even if processing duration varies at any chamber, such a variation does not affect the processing of the workpiece in other chambers. Each chamber performs processing of a workpiece in a predetermined order; a conveyor that conveys a workpiece to a next chamber; and a control device controls at least a start time of predetermined processing at each processing chamber. The control device sets: predetermined representative processing at a first chamber as a reference processing step, start time of the reference processing step as control start time, necessary processing duration specific to each chamber, necessary conveyance duration required to convey a workpiece between the chambers, and controls starting of the representative processing at each chamber while considering the control start time as origination.