Magnetic Cover Member for Plasma Torch Arc Blow Suppression
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Solution Overview
Problem
Plasma cutting of magnetized metals leads to magnetic arc blow, causing cutting defects and nozzle damage due to electromagnetic forces, and existing solutions are cumbersome and prone to adverse effects on the cutting surface and worker burden.
Innovation Solution
A plasma cutting machine equipped with a magnetic cover member attached to the plasma torch to cover the nozzle, suppressing leakage flux and magnetic arc blow by minimizing the extension of leakage flux to the plasma arc near the nozzle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a magnetic material is placed to straddle the cutting groove to reduce leakage flux, then magnetic arc blow is suppressed, but the worker burden increases and the cutting surface may be adversely affected
Solution Approach 1:
The plasma torch itself is modified to include a magnetic cover member, making the system self-serving by eliminating the need for separate magnetic materials to be placed by workers. The torch automatically provides the magnetic shielding function through its integrated cover member.
Solution Approach 2:
A magnetic cover member is introduced as an intermediary component between the plasma arc and the leakage flux from the cutting groove. This cover member acts as a mediator that redirects the leakage flux away from the plasma arc, suppressing magnetic arc blow without requiring worker intervention.
2Object-affected harmful factors
If a chain made of magnetic material is used to short-circuit locations on opposite sides of the cut groove, then leakage flux is reduced, but the chain may catch on workpiece features and hinder operation
Solution Approach 1:
The plasma torch is designed with an integrated magnetic cover member that automatically performs the function of reducing leakage flux, eliminating the need for separate chains or magnetic materials that could catch on workpiece features.
Solution Approach 2:
The problematic chain component is extracted from the system and replaced by integrating the magnetic shielding function directly into the plasma torch structure through the cover member.
3Object-affected harmful factors
If multiple magnetic materials are prepared to follow the torch, then magnetic arc blow suppression is maintained, but device complexity and preparation burden increase
Solution Approach 1:
The magnetic cover member is merged with the plasma torch structure, combining the cutting function and magnetic shielding function into a single integrated device. This eliminates the need for multiple separate magnetic materials and simplifies the overall system.
Solution Approach 2:
The plasma torch is designed with multi-functionality, serving both as the cutting tool and as the magnetic shielding device through its integrated cover member, eliminating the need for additional specialized components.
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
Effectively reduces magnetic arc blow, minimizing cutting defects and nozzle damage while reducing the burden on the worker and adverse effects on the cutting surface, with the magnetic cover member ensuring a stable plasma arc.
Implementation Method 1
the magnetic flux (referred to below as 'leakage flux,' see arrow A1) leaking from the cutting groove into a space increases
Implementation Method 2
an electromagnetic force acts on the plasma arc due to the magnetism of the member to be cut, and the plasma arc is bent
Data Source
AI summary
A plasma torch is provided with an electrode for generating a plasma arc, a nozzle having an opening through which the plasma arc passes, and a cover member. The cover member is arranged to cover the nozzle in the jetting direction of the plasma arc from the nozzle. The cover member has an opening through which the plasma arc passes. The cover member is made from a magnetic material.