Laser Cutting Inner Shell with Protective Plate
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Solution Overview
Problem
Existing methods for cutting openings in the inner shell of a turbomachine's frustoconical casing, such as EDM, EDM wire cutting, water jet, and laser cutting, face challenges like high cost, metallurgical issues, precision problems, and damage to the outer shell due to molten metal spattering and laser beam impacts.
Innovation Solution
A protective plate with apertures is placed between the inner and outer shells to absorb residual laser energy and redirect molten metal, ensuring a burr-free cut and minimizing the thermally affected zone by aligning the apertures inwardly and using a metal like aluminum with specific thickness and offset for effective protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser cutting is used to cut openings in the inner shell, then cutting precision and speed are improved, but the outer shell is damaged by laser beam impacts and molten metal spattering
Solution Approach 1:
A protective plate is introduced as an intermediary element between the inner shell and outer shell. This plate absorbs the harmful effects of laser beam impacts and molten metal spattering, preventing damage to the outer shell while allowing the laser cutting process to proceed with high precision on the inner shell.
Solution Approach 2:
The harmful effects (laser beam impacts and molten metal spattering) are extracted and redirected through the apertures of the protective plate. By positioning the protective plate's apertures inwardly offset from the cutting apertures, the molten metal is channeled away from the outer shell, separating the cutting function from the protection function.
2Ease of manufacture
If wax is used as protective material, then ease of application is improved, but it rapidly melts and is ejected by the laser gas, leaving the outer shell unprotected
Solution Approach 1:
The protective plate is designed as a disposable component that is consumed during the laser cutting process. It absorbs the harmful effects and is eventually damaged or removed, but in doing so, it reliably protects the outer shell throughout the entire cutting operation. This contrasts with wax which is ejected before completing its protective function.
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 effectively prevents back-spattering of molten metal and reduces the thermally affected zone to less than 0.05 mm, ensuring precise cuts without damaging the outer shell, particularly suitable for nickel-based alloys and tight shell gaps.
Implementation Method 1
the laser beam is stopped and its residual energy absorbed by the protector
Implementation Method 2
this metal is removed through the apertures in the protective plate and those in the second plate
Implementation Method 3
laser cutting method
Implementation Method 4
the impacts of the laser beam and by the spattering of molten metal
Data Source
AI summary
A method for laser cutting at least a first aperture in a first metal plate in the presence of a second metal plate placed parallel to and a short distance from the first plate and having a second aperture, the outline of which is in line with the outline of the aperture to be cut, wherein a plate forming a protective device, of defined thickness and having a third aperture whose outline is inwardly offset with respect to the outline of the second aperture, is placed between the first and second plates.