Predictive Torch Height Control for Bevel Cutting Accuracy
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Solution Overview
Problem
Conventional torch height control systems in numerical control machines face challenges in maintaining accurate torch height during bevel cutting, leading to incorrect cuts and quality issues due to reliance on arc voltage measurements, which are unstable and affected by factors other than torch height, resulting in torch dives and reduced accuracy.
Innovation Solution
A predictive torch height control system that uses preliminary measurements of XYZ contour points across the plate to generate a surface model, allowing for precise adjustment of the cutting torch's height during cutting, independent of the NC program, ensuring consistent torch height above the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional arc voltage measurement is used for torch height control, then the system is simple to operate, but the measurement precision deteriorates due to instability and interference from factors other than torch height
Solution Approach 1:
The patent introduces an intermediary height sensor that directly measures torch height or plate surface position, acting as a mediator between the torch control system and the actual height parameter. This intermediary device provides accurate height information without relying on indirect arc voltage measurements, thereby improving measurement precision while maintaining system ease of operation through automated sensing and feedback control.
2Manufacturing precision
If feedback-based torch height control is used, then torch height can be maintained during cutting, but torch dives occur when cutting through holes due to feedback instability
Solution Approach 1:
The patent applies preliminary action by measuring and storing the plate surface profile before cutting operations begin. The height sensor scans the plate surface in advance to create a digital elevation map, which is then used to predict and compensate for surface variations during cutting. This preliminary measurement allows the system to maintain accurate torch height control even when cutting through holes or varying terrain, preventing torch dives by having advance knowledge of the surface topology.
3Adaptability or versatility
If bevel cutting is performed with conventional height control, then complex shapes can be cut, but cut accuracy deteriorates due to incorrect torch height maintenance
Solution Approach 1:
The patent implements dynamics by making the torch height control system adaptive and responsive to real-time conditions. The height sensor continuously monitors the actual torch-to-plate distance during cutting operations, and the control system dynamically adjusts the torch position or height setpoint based on feedback from the sensor. This dynamic control mechanism maintains accurate torch height even during complex bevel cutting operations where the optimal height may vary along the cut path, thereby improving cut accuracy while preserving versatility.
Data Source
AI summary
A method for controlling a height of a cutting torch, includes loading a workpiece onto a numerical control machine, scanning the workpiece with a scanning device at a plurality of discrete points on an upper surface of the workpiece, measuring an X-, a Y-, and a Z-coordinate for each respective one of the scanned discrete points, where X and Y define a plane substantially parallel to the loaded workpiece and Z represents a distance between the upper surface and the scanning device at a respective discrete point, storing the measured XYZ coordinates from each of the scanned discrete points into a data set, mathematically fitting the stored data set to a smooth surface representative of the upper surface of the loaded workpiece, and cutting the workpiece along a cutting path programmed into the numerical control machine, while controlling the cutting torch height to correspond to the representative smooth surface.