Flame Cutting Torch Ignition Detection via Current Measurement
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Solution Overview
Problem
Existing flame cutting processes are complex and less reliable due to manual monitoring of process phases, leading to inefficiencies and potential damage from splashing slag.
Innovation Solution
Automated detection of the ignition point during the piercing phase by measuring the current flow through the flame, using a constant voltage between the cutting torch and the workpiece, allowing for precise control of the cutting process without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual monitoring of process phases is used, then operator flexibility is maintained, but reliability and efficiency deteriorate due to complexity and potential errors
Solution Approach 1:
The patent replaces manual operator monitoring with an automated electrical measurement system. A voltage source applies voltage between the cutting torch and workpiece, and a measuring device detects current flow through the flame. The system automatically identifies process phases (preheating, piercing, cutting) based on electrical characteristics, eliminating manual intervention and improving reliability while reducing operational complexity.
Solution Approach 2:
The system enables self-monitoring of the cutting process by utilizing the inherent electrical properties of the flame and circuit. The measurement device continuously monitors current flow and automatically detects phase transitions without external intervention, allowing the system to self-regulate and self-monitor the cutting process.
2Productivity
If the cutting torch is moved closer to the workpiece for rapid heating, then preheating efficiency improves, but slag splashing damage increases during piercing
Solution Approach 1:
The system uses electrical current measurement as feedback to detect the ignition point automatically. When the current exceeds a predetermined threshold, indicating the workpiece has reached ignition temperature, the system signals to adjust the torch distance. This feedback mechanism enables automatic transition from close proximity (for rapid heating) to greater distance (to avoid slag damage), optimizing both productivity and protection.
Solution Approach 2:
The system performs preliminary detection of the ignition point through continuous electrical monitoring before the actual piercing operation begins. By identifying when the workpiece reaches the ignition temperature in advance, the system can proactively adjust torch positioning to prevent slag splashing damage before it occurs.
3Extent of automation
If automated detection is implemented, then operator intervention is reduced, but measurement precision requirements increase
Solution Approach 1:
The system monitors changes in electrical current flow as the key parameter to detect ignition point. By measuring the current at different stages of the cutting process and identifying the specific moment when current exceeds the predetermined threshold, the system achieves precise automated detection of the ignition point, enabling high-level automation with reliable measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and automated control of the cutting process, reducing damage from slag and improving efficiency by detecting the ignition point through current changes, facilitating automated distance and gas mixture adjustments.
Implementation Method 1
the flame is electrically conductive and thus an electric current can flow through the flame
Implementation Method 2
a cutting torch generates a flame by burning a gas mixture
Implementation Method 3
the ignition point at which the flame begins to pierce the hole through the workpiece due to oxidation of the workpiece
Data Source
Figure 1~2
AI summary
The invention relates to a method for monitoring a flame cutting process (10) comprising a preheating phase (12), a piercing phase (14) following the preheating phase (12), and a cutting phase (16) following the piercing phase (14), wherein a cutting torch applies a flame generated by the combustion of a gas mixture to an electrically conductive workpiece, and wherein an electric current (I) flowing between an electrically conductive part of the cutting torch and the workpiece is measured by means of an ammeter during a measurement period (18). According to the invention, an ignition point (20), at which the piercing of a hole through the workpiece by means of the flame begins through oxidation of the workpiece, is detected by a change in the measured current (I).