Plasma Arc Torch Consumable Failure Detection

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Solution Overview

Problem

Plasma arc torch consumables are prone to failures, leading to increased heat load and potential damage to other torch components, and incorrect consumables can cause operational issues due to varying current levels and operating parameters.

Innovation Solution

A method and system for monitoring operating current and voltage during a transfer arc mode, calculating noise levels, and providing a failure signal when thresholds are exceeded, allowing for timely shutdown or adjustment to prevent damage and ensure proper consumable usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If consumables are monitored without automated detection, then operator attention is required frequently, but automation opportunities are reduced and productivity decreases

Engineering Contradiction:

Improveautomated consumable failure detectionVSAvoidmonitoring system complexity

Core Design Contradiction:

Extent of automationVSDevice complexity

Solution Approach 1:

The monitoring system uses the plasma arc torch's own operating parameters (current, voltage) to detect consumable failures automatically, allowing the system to monitor itself without external intervention or complex additional sensors

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system continuously monitors operating parameters and provides feedback when thresholds are exceeded, enabling automated detection and response to consumable failures without requiring operator attention

Inventive Principle:

Principle #23Feedback

2Reliability

If consumable inspection is performed frequently, then consumable failures can be detected, but cutting machine idle time increases and productivity decreases

Engineering Contradiction:

Improveconsumable failure detection accuracyVSAvoidcutting machine operational time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The monitoring system operates continuously during plasma arc torch operation, detecting consumable failures in real-time without requiring periodic interruptions or idle inspection time

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system replaces manual inspection methods with electronic monitoring of operating parameters, enabling continuous detection without stopping the cutting machine

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If consumables are used beyond their effective life, then productivity is maintained, but heat load increases and damage to other torch components occurs

Engineering Contradiction:

Improvecontinuous operation timeVSAvoidheat load on torch components

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system detects consumable failures before they cause catastrophic damage to other torch components, allowing timely replacement while maintaining productivity and preventing harmful heat accumulation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The monitoring system takes preliminary action by detecting early signs of consumable failure and alerting operators before the heat load becomes damaging to other components

Inventive Principle:

Principle #9Preliminary anti-action

4Ease of operation

If incorrect consumables are installed, then torch operation continues, but operational issues occur due to mismatched cooling flow and shield flow rates

Engineering Contradiction:

Improvetorch operation continuityVSAvoidoperational stability at different current levels

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system monitors operating parameters and provides feedback when consumable mismatches are detected, allowing operators to correct installations before operational instability occurs

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10039178B2Failure event detection in a plasma arc torch

Publication Date: 2018.07.31 HYPERTHERM INC

AI summary

A method of determining a failure event of consumable for a plasma torch is provided. The method includes monitoring at least one of an operating current or an operating voltage during a transfer arc mode of the plasma arc torch. The method also includes determining when at least one parameter associated with the operating current or the operating voltage exceeds a tolerance threshold for a time period indicative of the failure event. The method further includes shutting off at least one of the operating current or the operating voltage of the plasma arc torch when the at least one parameter exceeds the tolerance threshold for the time period.