Moving Workpiece Machining Control for Detection Timing Compensation
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Solution Overview
Problem
Existing workpiece machining devices experience reduced precision due to deviations between control cycles and workpiece detection timing, affecting the accuracy of machining operations on moving workpieces.
Innovation Solution
A workpiece machining device and method that measures the detection time of a moving workpiece relative to a control cycle, calculates a response delay time, and modifies operation command signals based on this delay to synchronize machining operations with the workpiece's position, thereby maintaining precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate control means are used for the transportation device and machining unit, then the device complexity is reduced and ease of operation is improved, but the machining precision deteriorates due to deviation between control cycle and detection signal timing
Solution Approach 1:
The patent combines the transportation device control and machining unit control into a single integrated control device. This integration allows the control device to receive detection signals from the sensor, determine workpiece positions based on these signals, and issue machining command signals to the machining unit in a coordinated manner, thereby eliminating timing deviations between separate control systems while maintaining operational simplicity.
2Manufacturing precision
If real-time control is implemented to improve machining precision, then the manufacturing precision is improved, but the device complexity increases due to additional timing measurement and signal modification mechanisms
Solution Approach 1:
The control device performs preliminary determination of workpiece positions based on detection signals before issuing machining command signals. By calculating the timing deviation between detection signals and control cycles in advance and compensating for it proactively, the system achieves real-time synchronization without requiring complex additional hardware, thus improving machining precision while maintaining relatively simple device architecture.
Data Source
AI summary
A workpiece machining device includes a sensor unit that detects the passage of a moving workpiece W, a machining unit that performs machining using a predetermined machining tool in a state where the workpiece W is moved, and a machining control unit that controls the operation of the machining unit. The machining control unit issues an operation command signal SP to the machining unit at intervals of a predetermined control cycle T, measures a detection time TD taken to receive a detection signal SD relative to a cycle start time point of the control cycle T, stores various parameters including the detection time TD, a difference between the control cycle T and the detection time TD is defined as a response delay time, and modifies the operation command signal SP in each control cycle T on the basis of the response delay time TD.