Plasma Torch Washout Strategy for Thick-Material Plunge Cutting
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Solution Overview
Problem
Conventional plasma cutting methods suffer from damage to the plasma torch, nozzle, and secondary gas cap during plunge cutting due to upwardly spraying molten material, especially when cutting thicker materials.
Innovation Solution
A method involving the creation of a washout on the workpiece surface prior to plunge cutting, achieved by adjusting the plasma cutting torch's operating parameters such as advancing speed and plasma torch distance, to deflect and redirect the molten material away from the cutting tool components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plunge cutting is performed directly into thicker materials, then cutting capability is improved, but damage to plasma torch components occurs due to upwardly spraying molten material
Solution Approach 1:
The method creates a washout depression on the workpiece surface before performing the actual plunge cut. This preliminary action removes material in advance to create a cavity that will capture and redirect molten material during subsequent cutting, preventing it from spraying upward and damaging the plasma torch components.
Solution Approach 2:
The washout depression acts as an intermediary structure between the plasma jet and the workpiece. It serves as a containment cavity that intercepts molten material, redirecting it away from the plasma torch components and preventing direct contact that would cause damage.
2Reliability
If washout is created before plunge cutting, then damage to equipment is reduced, but additional process time is required
Solution Approach 1:
The method combines the washout creation and plunge cutting operations into a single continuous process using the same plasma jet. By adjusting plasma parameters and torch movement, both the preliminary material removal and the actual cut are performed without interrupting the plasma arc, eliminating the need for separate processing steps.
Solution Approach 2:
The plasma cutting process uses periodic variation in advancing speed and plasma torch distance to perform different functions. During washout creation, the torch moves faster to remove material, then slows down for the actual plunge cut. This periodic action allows one process to accomplish multiple objectives.
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
This approach effectively reduces damage to the plasma cutting equipment by redirecting molten material away from the nozzle and secondary gas cap, allowing for more reliable plunge cutting through thicker materials.
Implementation Method 1
These gases ionize and dissociate owing to the energy of the plasma arc
Implementation Method 2
Plasma refers to a thermally highly heated, electrically conductive gas, which consists of positive and negative ions, electrons and excited and neutral atoms and molecules
Implementation Method 3
upwardly spraying molten material
Data Source
AI summary
A method for plasma cutting of workpieces, in which use is made of at least one plasma cutting torch having at least one plasma torch body, one electrode and one nozzle, through the nozzle opening of which at least one plasma gas or plasma gas mixture flows and which constricts the plasma jet, wherein, before the plunge cutting of the plasma jet into and through the workpiece, a washout is formed by the workpiece being exposed to the plasma jet from the workpiece surface at least for a duration t2 such that material of the workpiece is removed from the workpiece surface and the washout is produced.