Laser Bonding of Metal-Resin Composites With Local Absorptance Control
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Solution Overview
Problem
The existing methods for manufacturing composite bodies by bonding metal and resin members using laser light often result in non-uniform temperature rises due to intensity variations of the laser light, leading to bonding discrepancies between the central and edge portions of the bonding surface.
Innovation Solution
A composite body manufacturing method that involves a surface treatment process to adjust the absorptance of the laser light on the metal member's surface, creating distinct absorptance regions to ensure uniform temperature distribution during bonding, using pulsed or continuous wave lasers to irradiate the resin member from the opposite side, thereby enhancing bonding strength across the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser light is irradiated toward the metal member to bond it with the resin member, then bonding is achieved, but non-uniform temperature rise occurs due to intensity variations, causing bonding discrepancies
Solution Approach 1:
The patent applies local quality by creating different absorptance characteristics in different regions of the metal member's surface. The edge portions are treated to have higher absorptance than the central portion, allowing each region to absorb laser energy according to its specific needs and achieve uniform temperature distribution across the bonding surface.
2Productivity
If the laser beam intensity is high at the center, then efficient bonding occurs at the center, but the edge portions receive insufficient energy, causing bonding discrepancies
Solution Approach 1:
The surface treatment creates local quality differences where edge portions have higher absorptance to compensate for lower laser intensity, while the central portion maintains its higher laser intensity reception. This ensures consistent bonding quality across the entire bonding surface despite the inherent Gaussian intensity distribution of the laser beam.
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 method achieves uniform temperature distribution and bonding strength by increasing the absorptance of the edge regions relative to the center, effectively suppressing bonding discrepancies even with non-uniform laser light intensity, resulting in a more consistent composite body.
Implementation Method 1
surface treatment processing of a first surface of a first member (10) made of metal is performed to change an absorptance for laser light
Implementation Method 2
a second member (20) made of a resin transmissive to laser light
Data Source
AI summary
A composite body manufacturing method according to an embodiment includes a surface treatment process and a bonding process. In the surface treatment process, surface treatment processing of a first surface of a first member is performed to change an absorptance for the laser light. In the bonding process, the first surface having undergone the surface treatment processing and a second surface of a second member are bonded by irradiating the laser light. The first surface includes a first portion in which an intensity of the laser light irradiated in the bonding process is a first intensity, and a second portion in which the intensity of the laser light irradiated in the bonding process is a second intensity less than the first intensity. The surface treatment processing is performed so that a second absorptance of the second portion becomes greater than a first absorptance of the first portion.