Plasma Torch Edge Rounding for Coated Steel
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Solution Overview
Problem
The existing methods for cutting steel plates in iron and steel structures require time-consuming and labor-intensive secondary fabrication to prevent coated films from separating at the edges of curved surfaces, particularly when cutting around ribs or curved features like manholes or piping holes, as the edges formed by vertical cutting are prone to rust and film separation.
Innovation Solution
A plasma cutting method and apparatus that selectively perform vertical, bevel, and R-cutting by adjusting cutting electric current, speed, torch height, angle, and plasma gas flow rate to form upper and lower edges of the cutting plane in a curved shape, allowing for continuous cutting of desired shapes and preventing coated film separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vertical cutting is performed to form the cutting plane perpendicular to the steel plate surface, then the cutting precision and efficiency are improved, but the coated film separation at the edges occurs
Solution Approach 1:
The invention changes the cutting parameters (torch angle, cutting speed, gas flow rate) dynamically during the cutting process. By adjusting these parameters, the cutting edge transitions from a sharp perpendicular angle to a rounded profile with a radius of curvature of 2-5mm, eliminating the stress concentration that causes coated film separation while maintaining cutting efficiency
Solution Approach 2:
The invention performs the edge rounding action during the primary cutting process itself, rather than as a separate secondary operation. The plasma torch parameters are adjusted in advance to create the rounded edge profile directly during cutting, preventing coated film separation before coating application
2Reliability
If secondary fabrication by sander or chamfering machine is performed to form dull angle at edges, then the coated film separation is prevented, but the production time and labor cost increase significantly
Solution Approach 1:
The invention merges the primary cutting operation with the edge finishing operation into a single integrated process. By controlling the plasma torch parameters during cutting, the rounded edge profile is created simultaneously with the cut, eliminating the need for separate sanding or chamfering operations and significantly improving productivity
Solution Approach 2:
The invention replaces the mechanical secondary fabrication process (sanding or chamfering) with a thermal process using plasma. The plasma arc melts and rounds the cutting edge during the cutting operation itself, substituting a high-speed thermal process for slow mechanical material removal
3Reliability
If manual secondary fabrication is performed on curved surfaces like manholes or piping holes, then the coated film separation is prevented, but the labor intensity and time consumption increase greatly
Solution Approach 1:
The invention enables the cutting process to self-adjust and create the appropriate edge profile automatically. The control system dynamically modifies torch angle and cutting speed based on the cutting path geometry, allowing the process to adapt to curved surfaces like manholes or piping holes without manual intervention for edge finishing
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
The method enables efficient cutting of curved edges during the initial cutting process, reducing labor and preventing coated film separation, thus enhancing the efficiency and durability of coated steel surfaces in iron and steel structures.
Implementation Method 1
supplying plasma gas to the periphery of an electrode of a plasma torch and ejecting plasma arc from a nozzle
Implementation Method 2
supplying plasma gas to the periphery of an electrode of a plasma torch
Implementation Method 3
in order to melt the upper edge and the lower edge to form a curved shape
Data Source
AI summary
The present invention relates to a cutting method for cutting an upper edge and a lower edge of a cutting plane into a curved shape, when a cutting object is cut by supplying plasma gas to the periphery of an electrode of a plasma torch and ejecting plasma arc from a nozzle. In order to melt the upper edge and the lower edge of the cutting plane to form a curved shape, at least one condition selected from plural conditions including a cutting electric current, cutting speed, height of a plasma torch, angle of the plasma torch, and flow rate of plasma gas upon performing the vertical cutting for forming the upper edge and the lower edge of the cutting object substantially at right angles is changed.