Decoupled Pressing Means for Laser Transmission Welding
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Solution Overview
Problem
Current laser transmission welding technologies face challenges in achieving precise and efficient welding of flexible plastic parts due to inadequate contact pressure and high inertial masses in existing devices, leading to slow production times and potential damage to the joining partners.
Innovation Solution
A device with a decoupled laser-transparent pressing means that allows for fine adjustment of contact force and pressure, using a lightweight and movable pressing mechanism within a processing head, enabling precise contact pressure application and high dynamics for welding flexible parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional laser welding device with integrated pressing means is used, then the device structure is simple, but the contact pressure cannot be precisely adjusted and the inertial mass is high导致 slow production times
Solution Approach 1:
The pressing means is decoupled from the processing head and separated into an independent module that can be adjusted separately. This segmentation allows the pressing means to be optimized independently for low inertial mass and precise pressure control, while the processing head maintains its laser transmission function, thereby reducing production time without excessive structural complexity
Solution Approach 2:
The pressing means is designed to be movable and adjustable during the welding process, allowing dynamic optimization of contact pressure. The decoupled pressing means can be quickly positioned and adjusted for different welding requirements, enabling high-speed production while maintaining precise pressure control
2Strength
If high contact pressure is applied to weld flexible plastic parts, then welding strength is improved, but unwanted wrinkling occurs on the film surface
Solution Approach 1:
The decoupled pressing means enables precise control and fine adjustment of contact pressure parameters. By optimizing the pressure magnitude and distribution, the system achieves sufficient welding strength while avoiding excessive pressure that would cause wrinkling of the flexible film surface
3Ease of operation
If the pressing means is integrated into the processing head, then the device is compact, but the contact force cannot be finely adjusted and high inertial mass reduces dynamics
Solution Approach 1:
By separating the pressing means from the processing head, the system reduces the inertial mass of the moving components. The decoupled pressing means can be designed as a lightweight, independently adjustable module, enabling fine control of contact force without the burden of high inertial mass that would reduce system dynamics and response speed
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 precise and efficient welding of flexible plastic parts with high dynamics and short production times, avoiding unwanted wrinkling and maintaining the stability of the multilayer film, while allowing for high-quality weld seams.
Implementation Method 1
at least part of the laser light used is absorbed by the material of at least one of the two molded parts to be connected to one another, at least to an extent that it can be converted into heat
Implementation Method 2
the material is exposed to the laser light heated point melted by heating
Implementation Method 3
a laser-transparent pressing means for pressing the parts together; wherein the laser-transparent pressing means is guided in the exit shaft decoupled from the processing head
Data Source
Figure 1~2
AI summary
The invention relates to a device for laser transmission welding of two plastic parts (100, 200) to be joined, wherein at least one of the plastic parts to be joined contains an absorber for laser light, the device comprising a processing head (10) with a processing side (12), a processing-side outlet shaft (14) for at least one laser beam (16) and a laser-transparent pressing means (18) for pressing together the plastic parts (100, 200) to be joined, wherein the laser-transparent pressing means (18) is guided in the outlet shaft (14) decoupled from the processing head (10). A method for creating a welded bond of two plastic parts (100, 200) to be joined by laser transmission welding is also specified.