Inner Casing Slot Milling with Guided Circumferential Machining
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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 inner surfaces of gas turbine casings for the integration of measurement systems.
Innovation Solution
A milling system comprising a sled-style milling device with a frame assembly and 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 methods are used to machine slots in gas turbine casings, then the equipment can be installed for testing and validation, but the process becomes labor intensive and time consuming
Solution Approach 1:
The patent replaces traditional manual or complex mechanical machining methods with a specialized milling device that integrates structural guides and bearing supports. This substitution enables more efficient material removal and slot creation, directly improving productivity while reducing the time required for installation preparation
Solution Approach 2:
The patent introduces structural guides and bearing supports as intermediary elements between the milling device and the casing. These intermediaries facilitate precise positioning and stable support during machining, enabling faster and more efficient slot creation without compromising accuracy, thus resolving the contradiction between productivity and time loss
2Manufacturing precision
If a specialized milling device is designed for precise machining, then machining precision is improved, but the device complexity increases
Solution Approach 1:
The milling device is segmented into distinct functional modules: structural guides for positioning, bearing supports for stability, and the milling cutter assembly. This segmentation allows each component to perform its specific function efficiently while maintaining overall device manageability, achieving precision without excessive complexity
Solution Approach 2:
The structural guides and bearing supports serve multiple functions: they provide positioning, support, and guidance simultaneously. This multi-functionality reduces the number of separate components needed, maintaining manufacturing precision while limiting device complexity through functional integration
3Ease of operation
If the milling device is made transportable and adaptable for single-person operation, then ease of operation is improved, but the device may lack stability or precision
Solution Approach 1:
The milling device incorporates adjustable and movable components that allow a single operator to position and secure the device on the casing. The structural guides and bearing supports can be adjusted to fit different casing geometries, providing ease of operation while maintaining machining reliability through proper mechanical engagement
Solution Approach 2:
The device is designed to be self-sufficient for single-person operation, with integrated positioning and support features that automatically engage with the casing geometry. The structural guides and bearing supports work together to provide inherent stability without requiring additional operators or complex external fixtures, ensuring both ease of operation and machining reliability
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.