Laser-Defined Pressure Relief Line of Opening
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Solution Overview
Problem
Existing pressure relief devices face issues with brittleness and unpredictability due to work hardening from metal scoring dies, and challenges in controlling the depth and width of score lines, which limit the service life and burst pressure range.
Innovation Solution
A pressure relief device with a line of opening formed by laser machining, comprising co-linear recesses and gap segments, which maintains metal integrity and allows for precise control over the opening characteristics without altering the metal grain structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal scoring dies are used to form score lines, then the disc can be manufactured with a defined opening area, but the work hardening increases metal brittleness and creates stress zones that limit service life
Solution Approach 1:
The patent replaces the mechanical scoring die process with a laser-based process to form the line of weakness. The laser creates a controlled heat-affected zone that defines the opening path without the mechanical contact and work hardening of traditional scoring dies, thereby maintaining manufacturing precision while eliminating the harmful effects on metal integrity and service life
Solution Approach 2:
The patent changes the physical state and properties of the metal along the score line through controlled thermal processing. By using laser energy to heat and selectively alter the metal properties (creating a heat-affected zone with modified grain structure), the process achieves precise line definition while controlling the depth and characteristics of the weakness line to prevent excessive brittleness
2Manufacturing precision
If metal scoring dies are used to form score lines, then the opening area can be defined, but the depth control becomes unpredictable due to die wear
Solution Approach 1:
The patent replaces the mechanical scoring die with a laser process that does not suffer from wear in the same way. The laser parameters (power, speed, focus) can be precisely controlled and maintained, providing consistent depth control for the line of weakness without the degradation that occurs with repeated mechanical contact of scoring dies
Solution Approach 2:
The patent uses controlled thermal parameters (laser power, scan speed, focal position) to achieve precise and repeatable depth control of the line of weakness. By monitoring and maintaining these parameters, the process ensures predictable opening characteristics while eliminating the variability introduced by die wear
3Reliability
If electropolishing is used to form the line of weakness, then the metal grain structure is not altered, but the width control becomes difficult particularly for thick discs
Solution Approach 1:
The patent replaces the chemical electropolishing process with a laser-based thermal process. The laser provides precise spatial control through its focused beam, allowing accurate control of both the width and depth of the line of weakness while avoiding the diffusion-like nature of electropolishing that makes width control difficult, especially for thick discs
Solution Approach 2:
The patent uses the laser's ability to control energy distribution in multiple dimensions (focus depth, beam width, scan speed) to independently control both the width and depth of the line of weakness. This multi-dimensional control allows precise formatting of the opening line while maintaining metal integrity, overcoming the single-dimension control limitation of electropolishing
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 increases the stiffness and integrity of the pressure relief area, enabling tighter control over tearing and extending the range of burst pressures, while reducing metal fatigue concerns.
Implementation Method 1
The line of opening is formed in the pressure relief area by selective operation of a laser to form a plurality of co-linear recesses
Data Source
AI summary
A pressure relief device and method of making the same are provided. The pressure relief device includes an over-pressure relief area with a plurality of co-linear spaced apart recesses located thereon. Gap segments are interspersed between the recesses to define a line of opening having desired performance characteristics during opening of the over-pressure relief area.