Inner Casing Slot Milling with Structural Guides for Gas Turbines
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Solution Overview
Problem
The installation of equipment for testing and validation of gas turbines is labor intensive and time consuming, requiring efficient methods to machine slots in the turbine casing for sensor systems without damaging the casing.
Innovation Solution
A milling system with a sled-style milling device that includes a frame assembly and a milling cutter, configured to engage structural guides on the casing for precise axial positioning and movement in a circumferential direction, enabling the machining of slots on the inner surface of gas turbine casings, including those that are damaged, warped, or worn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional machining methods are used to machine slots in gas turbine casings, then the slots can be machined, but the process becomes labor intensive and time consuming
Solution Approach 1:
The patent replaces traditional mechanical machining methods with a specialized milling device that integrates guidance mechanisms and cutting tools into a unified system. The device uses structural guides that engage with features on the casing inner surface to automatically maintain axial position, eliminating the need for manual positioning and measurement operations.
Solution Approach 2:
The patent introduces structural guides as intermediary elements between the milling device and the casing. These guides engage with structural features on the casing inner surface and transmit positioning information to the milling device, enabling automatic axial positioning without direct manual intervention.
2Manufacturing precision
If precise positioning is achieved using structural guides, then axial position is maintained accurately, but the device complexity increases
Solution Approach 1:
The patent combines the guidance function and cutting function into a single integrated milling device. The structural guides are integrated with the frame assembly, and the milling cutter is positioned relative to the guides, creating a unified device that performs both positioning and machining operations.
Solution Approach 2:
The milling device is designed with universal applicability through interchangeable structural guides that can engage with different structural features on various casing types. The same basic device structure can accommodate different guide configurations to work with different casing geometries and feature arrangements.
3Ease of operation
If the milling device is designed for single-person operation and transportability, then ease of operation improves, but the structural strength and rigidity may be compromised
Solution Approach 1:
The milling device is divided into modular components including the frame assembly, structural guides, milling cutter, and bearing support. These segments can be assembled and disassembled easily, allowing single-person operation and transportability while maintaining structural integrity when assembled. The modular design enables the device to be configured for different machining requirements.
Data Source
AI summary
A milling device for machining a slot into an inner surface of a casing for a gas turbine engine. The milling device includes a frame assembly including multiple structural guides configured to engage structural features on the inner surface of the casing to maintain an axial position of the milling device relative to a longitudinal axis of the casing. The milling device also includes a milling cutter coupled to the frame assembly. The milling device is configured to be displaced in a circumferential direction relative to the longitudinal axis to machine the slot, via the milling cutter, along the inner surface of the casing in the circumferential direction.