Laser Cutting Nozzle Adapter for Purge Shielding and Sensing
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Solution Overview
Problem
Laser cutting heads face challenges in maintaining precise control of the nozzle standoff distance due to contamination and interference at acute angles, which affects capacitive sensing and can lead to nozzle damage from debris and molten material.
Innovation Solution
A conductive adapter with a collar and a cover that encloses a space for purge gas communication, protecting the nozzle and capacitive sensing components, while allowing for precise control of the laser cutting process and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the nozzle is positioned at acute angles for bevel cutting, then the cutting versatility is improved, but the capacitive sensing precision deteriorates due to interference from nozzle features
Solution Approach 1:
The adapter assembly acts as an intermediary between the nozzle and the cutting head, providing a reference surface that is positioned away from the nozzle features. This reference surface serves as the new reference point for capacitive sensing, eliminating interference from nozzle features while maintaining acute angle cutting capability
Solution Approach 2:
The reference surface on the adapter is positioned at a different spatial location (another dimension) relative to the nozzle features. By moving the sensing reference point to the adapter rather than the nozzle itself, the system eliminates geometric interference while preserving cutting versatility
2Adaptability or versatility
If the nozzle operates at acute angles without protection, then the cutting versatility is improved, but the nozzle reliability deteriorates due to contamination from debris and molten material
Solution Approach 1:
The adapter and cover assembly serve as a protective intermediary barrier between the nozzle and the contaminated cutting environment. This barrier prevents debris and molten material from reaching the nozzle while allowing the nozzle to maintain its acute angle positioning for versatile cutting operations
Solution Approach 2:
The protective cover and adapter assembly are positioned beforehand to create a shielded environment around the nozzle. This pre-established protection prevents contamination before it can affect the nozzle, ensuring reliable operation during acute angle cutting
3Ease of operation
If the nozzle is exposed to the cutting environment without protection, then the ease of operation is improved, but the manufacturing precision deteriorates due to contamination of the cutting head optics and sensing
Solution Approach 1:
The adapter and cover assembly act as a protective intermediary that shields the internal cutting head components (optics and sensing) from contamination while maintaining easy access and operation. The nozzle can operate freely at acute angles without risking contamination of the precision 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
The solution effectively shields the nozzle and sensing components from debris and contamination, maintaining precise control and extending nozzle life by using purge gas for cooling and shielding during acute angle cutting operations.
Implementation Method 1
The cover is configured to enclose a space communicating the purge gas from the orifice to the one or more flow passages of the collar
Implementation Method 2
using purge gas for cooling and shielding during acute angle cutting operations
Implementation Method 3
One typical system for monitoring (and controlling) this gap is based upon a measured capacitance between the nozzle tip and the workpiece's surface (with the air gap between the two serving as the dielectric for the capacitor)
Implementation Method 4
The laser cutting head converts the energy of a high-power laser source (typically a CO2 or YAG laser) into a laser beam able to cut through (sever) a metal sheet
Implementation Method 5
The cutting head focuses the beam to a spot size desired for the cutting process
Implementation Method 6
The gas functions either to assist in the melting process (e.g., 'oxy-fuel burning process') or to help blow molten material away from the workpiece
Data Source
AI summary
A laser cutting head uses a nozzle and gas flow to perform laser cutting or the like. The laser processing and the gas flow passes from an end of the housing. A sensor assembly affixed to the end of the housing has a first through which the laser processing passes and an orifice from which the gas flow passes. A conductive adapter affixes to the sensor assembly and has a passage through which the laser processing passes. The nozzle affixes in a receptacle in an end of the conductive adapter. A collar disposed about the adapter defining one or more gas flow passages therethrough. A cover is disposed between the sensor assembly and the collar and encloses a space communicating the gas flow from the orifice to the one or more flow passages of the collar.