Laser Cutting Safety Rupture Discs for Consistent Breaking Threshold
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Solution Overview
Problem
Existing methods for producing safety/rupture discs with pre-calculated breaking thresholds are costly, time-consuming, and lack accuracy due to mechanical tool contact, which can alter the crystalline structure and lead to inconsistent performance.
Innovation Solution
A method using a laser beam to create precise cuts on a metallic surface without direct tool contact, employing a pulsed laser with controlled power and speed to define frangible lines and breaking initiation regions, ensuring reproducible and adaptable production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical cutting tools (punches, micro-milling) are used to create frangible lines, then cuts can be made with direct tool contact, but this leads to tool wear, regrounding, replacement, production stops, and altered crystalline structure
Solution Approach 1:
The patent replaces mechanical cutting tools with a laser beam for creating frangible lines. The laser beam melts and vaporizes material without physical contact, eliminating tool wear and the need for regrounding or replacement. This substitution resolves the contradiction by maintaining ease of manufacture while significantly improving reliability and consistency of the breaking threshold.
Solution Approach 2:
The patent introduces a layer of protective material as an intermediary between the laser beam and the metal surface. The laser first traces cuts in the protective layer, then electrical polishing removes metal through the created pathways. This intermediary approach allows precise cut definition without direct laser-metal contact that would cause unwanted thermal effects, resolving the contradiction between ease of manufacture and reliability.
2Ease of manufacture
If mechanical cutting tools are used, then cuts can be made, but work speeds are reduced and production costs increase
Solution Approach 1:
The patent replaces slow mechanical cutting processes with laser beam processing, which operates at much higher speeds. The laser can rapidly trace frangible lines and create breaking initiation regions without the constraints of mechanical tool feed rates. This substitution directly resolves the contradiction by dramatically increasing work speed while maintaining ease of manufacture.
Solution Approach 2:
The patent employs pulsed laser operation to melt and vaporize material in controlled cycles. The pulsed nature allows rapid successive pulses to accumulate material removal efficiently, increasing overall processing speed compared to continuous mechanical cutting. This periodic action resolves the contradiction between ease of manufacture and productivity.
3Ease of manufacture
If mechanical tools contact the device, then cuts can be made, but the crystalline-metallurgic structure is altered and breaking threshold becomes unpredictable
Solution Approach 1:
The patent replaces mechanical cutting with laser beam processing that melts and vaporizes material without mechanical contact. This eliminates the mechanical stresses and forces that alter crystalline structure in mechanical cutting. The laser method maintains manufacturing ease while dramatically improving the accuracy and predictability of the breaking threshold by preserving the material's crystalline-metallurgic structure.
Solution Approach 2:
The patent carefully controls laser parameters (power, pulse duration, scanning speed) to achieve precise material removal without excessive thermal input that would alter crystalline structure. By optimizing these parameters, the process maintains ease of manufacture while ensuring manufacturing precision of the breaking threshold through controlled thermal effects that minimize structural changes.
4Reliability
If known laser methods are used with protective layer, then cuts can be made without tool contact, but work times become very long and production costs increase
Solution Approach 1:
The patent extracts and removes the protective material layer after the laser has traced the frangible lines in it. This allows the laser to work in the protective layer (maintaining reliability) while the subsequent removal step eliminates the need for lengthy post-processing. This extraction approach resolves the contradiction by maintaining consistency of breaking threshold while dramatically reducing total work time compared to methods requiring protective layer to remain.
Solution Approach 2:
The patent creates a continuous process where the laser traces cuts in the protective layer, then electrical polishing continuously removes metal through the created pathways until the protective layer is fully removed. This continuous useful action eliminates idle time between steps and maintains high productivity while ensuring reliability through consistent laser-traced frangible lines throughout the process.
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
Enables quick, cost-effective, and accurate production of safety devices with consistent breaking thresholds, reducing tool wear and maintaining the crystalline structure, thus ensuring reliable operation.
Implementation Method 1
applying a laser beam directly onto said metallic surface and removing a tiny portion of the metal material by ablation
Implementation Method 2
employing a pulsed laser with controlled power and speed to define frangible lines
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A method for production of safety/rupture devices having pre-calculated breaking threshold comprises the steps of providing a plate (2) having at least one metallic surface (2a); making at least one cut (5) in said surface (2a) of said plate (2) to define a frangible line of pre-established rupture. The step of making at least one cut (5) is obtained by application of a laser beam (8) directly onto said metallic surface (2a).