Laser Separation of Hollow Glass Bodies With Diameter Control
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Solution Overview
Problem
Conventional methods for separating a hollow glass body from a glass tube using laser radiation often result in an undesirably large reduction in the inside diameter at the separation end, leading to a high reject rate and reduced reproducibility in production.
Innovation Solution
The method involves laser cutting the glass tube to separate the hollow glass body, focusing the laser beam on the wall of the glass tube to achieve energy densities that allow separation without a mechanically introduced scratch, thereby minimizing the reduction in inside diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser radiation methods are used to separate hollow glass body from glass tube, then separation can be achieved, but the inside diameter at the separation end is undesirably reduced
Solution Approach 1:
A scratch is mechanically introduced into the glass tube before laser heating to pre-weaken the material at the separation location. This preliminary mechanical action enables subsequent laser-assisted separation to proceed with less energy and causes less damage to the inside diameter of the hollow glass body.
Solution Approach 2:
The patent replaces purely mechanical scratching methods with a combined approach where mechanical scratching is followed by laser-assisted heating. The laser energy substitutes for additional mechanical force, allowing the separation to complete with minimal impact on the inside diameter while maintaining process reliability.
2Reliability
If conventional laser radiation methods are used to separate hollow glass body from glass tube, then separation can be achieved, but the reject rate during production is undesirably high
Solution Approach 1:
By mechanically introducing a scratch before laser heating, the separation process becomes more predictable and reliable. The pre-created defect ensures consistent separation at the intended location, reducing variability and improving reproducibility across production batches.
Solution Approach 2:
The mechanically introduced scratch acts as an intermediary that facilitates the laser heating process. It serves as a nucleation point for thermal stress concentration, making the separation process more controllable and reproducible, thereby reducing the reject rate.
3Manufacturing precision
If conventional laser radiation methods are used to separate hollow glass body from glass tube, then separation can be achieved, but the inside diameter at the separation end is undesirably reduced
Solution Approach 1:
The separation process is divided into two distinct stages: (1) mechanical scratching to create an initial defect, and (2) laser-assisted heating to complete the separation. This segmentation allows each step to be optimized independently, with the mechanical scratch being simple and the laser heating providing precise control over the separation quality and inside diameter preservation.
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 approach improves reproducibility and reduces the reject rate during production by maintaining a smaller reduction in the inside diameter of the hollow glass body at the separation end, compared to conventional methods.
Implementation Method 1
Laser radiation can be used to reshape hollow glass bodies
Implementation Method 2
the hollow glass is heated by means of laser radiation
Implementation Method 3
The laser cutting operation may comprise laser sublimation cutting
Implementation Method 4
in any case melting processes can also take place in a second zone in the wall of the glass tube
Implementation Method 5
laser cutting the glass tube to separate the hollow glass body
Data Source
AI summary
A glass tube is treated with laser cutting for separating a hollow glass body from the glass tube. A laser beam used for laser cutting is focused on a wall of the glass tube.