Laser Machining Head Insulation Detection to Prevent Nozzle Collisions
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Solution Overview
Problem
Existing insulation parts for laser machining heads do not allow for user-friendly monitoring of their presence, leading to potential collisions with the workpiece due to faulty distance regulation, especially when they are missing, which can result in damage to the machining head.
Innovation Solution
An insulation part made of ferromagnetic material, such as a ring-shaped ceramic body with embedded ferromagnetic components or a nickel/cobalt/iron-based alloy, which can be detected by a sensor to ensure the presence of the insulation part is monitored, preventing collisions and overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation parts (ceramic, aluminum with coating, plastic rings) are used, then electrical insulation is provided, but the presence of the insulation part cannot be monitored
Solution Approach 1:
A ferromagnetic body is introduced as an intermediary element within the insulation part. This ferromagnetic body serves as a detectable marker that mediates between the insulation part and the sensor, enabling indirect detection of the insulation part's presence through magnetic field interaction without requiring direct electrical or mechanical connection.
Solution Approach 2:
The patent replaces complex mechanical monitoring systems with a sensor-based detection system. Instead of using mechanical switches, contacts, or complex electrical circuits to detect the insulation part, a simple sensor detects the magnetic field of the ferromagnetic body, significantly simplifying the monitoring system while maintaining reliability.
2Reliability
If internal capacitance monitoring is used to detect missing insulation parts, then collision prevention is enabled, but the method is incompatible with active shielding measuring systems
Solution Approach 1:
The ferromagnetic body acts as a universal intermediary that can be detected by various sensor types including those used in active shielding systems. This intermediary approach allows the detection method to be compatible with different measuring systems, including capacitance-based, inductive, and magnetic field sensors, thereby improving adaptability.
3Reliability
If two-line connection through conductive nozzle tip is used to monitor insulation part presence, then detection is enabled, but mechanical complexity and costs increase disproportionately
Solution Approach 1:
The patent replaces the mechanical two-line connection system with a non-contact sensor-based detection system. The sensor detects the magnetic field of the ferromagnetic body without requiring physical contact or complex wiring through the conductive nozzle tip, thereby reducing mechanical complexity and manufacturing costs while maintaining detection reliability.
4Reliability
If ferromagnetic material is used for insulation part, then sensor-based monitoring is enabled, but thermal protection capability is reduced
Solution Approach 1:
The insulation part is segmented into functionally distinct components: a ferromagnetic body for detection purposes and a thermally insulating material for thermal protection. This segmentation allows each component to optimize its specific function while working together as an integrated assembly, resolving the conflict between detectability and thermal resistance.
Solution Approach 2:
The insulation part uses composite construction combining ferromagnetic material with thermally insulating materials. This composite structure enables the part to simultaneously provide magnetic detectability for monitoring and thermal insulation for heat protection, achieving both detection reliability and thermal resistance.
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 solution allows for inexpensive production and user-friendly monitoring of the insulation part, preventing damage to the laser machining head by ensuring the correct presence of the insulation part and providing thermal protection through temperature-dependent ferromagnetic detection.
Implementation Method 1
An insulation part made of ferromagnetic material, such as a ring-shaped ceramic body with embedded ferromagnetic components or a nickel/cobalt/iron-based alloy, which can be detected by a sensor
Data Source
AI summary
An insulation part for supporting an electrically conductive nozzle in an insulated manner, and a laser machining head with a housing (10), through which a working laser beam path (11) is guided. The working laser beam path (11) exits on the machining side through an electrically conductive nozzle (17). The electrically conductive nozzle (17) is supported on an insulation part (18), which is supported on the housing (10), and which, for the capacitive distance measurement, is electrically connected to an oscillating circuit (24) of a distance measuring circuit (22). To monitor the presence of an inexpensive insulation part (18) in a user-friendly manner, the insulation part (18) comprises a ferromagnetic body (26) and a sensor (27) for detecting the ferromagnetic body (26) is provided on the housing (10). The sensor is connected to a monitoring circuit (29) that, in the absence of an insulation part (18), outputs a warning signal.