Shaped Wrapping Sheet Laser Cutting With Multi-Pass Edge Control
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Solution Overview
Problem
Current methods for cutting shaped sheets of wrapping, particularly those with metal layers, face challenges in achieving high-speed cutting while preserving the surface finish and avoiding tool wear, which limits the effectiveness of laser cutting compared to mechanical solutions.
Innovation Solution
A method utilizing a laser cutting process with multiple passes of a laser beam along distinct paths to cut the sheet along a pre-set profile, ensuring complete cutting without plastic deformation and preserving the surface characteristics, including the use of different wavelengths for polymeric and metal layers if present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser cutting is used to cut sheets of wrapping with metal layers, then cutting speed and elimination of tool wear are improved, but surface finish preservation and cutting quality deteriorate compared to mechanical solutions
Solution Approach 1:
The cutting process is divided into multiple sequential passes of the laser beam, each pass removing material layer by layer. This segmentation allows controlled material removal while maintaining surface quality, resolving the contradiction between cutting speed and surface finish preservation.
Solution Approach 2:
The laser beam is applied periodically in discrete passes rather than continuously, with each pass separated by a small interval. This periodic application allows heat dissipation between passes, preventing excessive thermal damage to the surface while maintaining efficient cutting progress.
2Manufacturing precision
If mechanical cutting tools are used, then surface finish is preserved, but tool wear and replacement requirements worsen productivity
Solution Approach 1:
The mechanical cutting tool is replaced with a laser beam for cutting operations. This substitution eliminates mechanical contact, thereby eliminating tool wear and the need for tool replacement, while maintaining cutting efficiency through the use of multiple controlled passes.
3Productivity
If laser cutting parameters are increased to improve speed, then productivity improves, but surface damage and loss of surface characteristics worsen
Solution Approach 1:
Instead of applying excessive laser energy in a single pass, the cutting process uses multiple passes with each pass removing only a portion of the total material thickness. This partial action approach prevents surface damage while achieving the required cutting depth, resolving the contradiction between cutting speed and surface damage.
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 allows for high-speed cutting with minimal tool wear and surface preservation, enhancing the quality of the cut edges, especially for printed sheets, and maintaining the integrity of the sheet's layers.
Implementation Method 1
cutting the sheet of wrapping (100) by means of a laser beam (B) along a pre-set profile (K)
Implementation Method 2
carrying out a plurality of passes of the laser beam (B) that follow a plurality of distinct paths
Data Source
AI summary
A method for producing a shaped sheet of wrapping, including a hollow portion and a perimetral edge that extends along a pre-set profile, is provided. The method includes laying a sheet of wrapping on a treatment surface having a forming cavity. The method includes forming the sheet of wrapping within the forming cavity so as to reproduce the shape of the hollow portion thereon, without subjecting the sheet of wrapping to deformation by stretching. The method includes cutting the formed sheet of wrapping along the pre-set profile for producing the perimetral edge and obtaining the shaped sheet of wrapping. In the method, the cutting step envisages the use of a laser beam according to a particular cutting mode.