Flexible Revolving Cathode for Complex Aero-Engine Casing Inner Walls
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Solution Overview
Problem
Conventional revolving cathode tools are ineffective for machining the complex, non-array structured inner walls of aero-engine casings, requiring a new tool design to enable efficient and one-time machining of large-sized parts with complex surface structures.
Innovation Solution
A revolving cathode tool with a flexible cathode assembly, including an insulated window and a conductive sliding block, is used for co-rotating electrochemical machining, where an insulating sheet is applied to non-array distributed convex structures to control machining current, allowing for uniform corrosion and avoiding tool size limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional revolving cathode tool is used for electrochemical machining, then simple array structures can be machined, but complex non-array structures on inner walls cannot be machined
Solution Approach 1:
The cathode tool is segmented into multiple independent conductive blocks arranged in specific patterns. Each block can be independently positioned and controlled, allowing the tool to machine complex non-array structures by selectively activating different blocks, thereby achieving high adaptability without excessive overall complexity.
Solution Approach 2:
The cathode tool employs a flexible structure that allows dynamic adjustment of conductive block positions during machining. This dynamic capability enables the tool to adapt to various complex non-array patterns on inner walls, transforming a static tool into a versatile system that can handle diverse geometries.
2Adaptability or versatility
If a small-diameter cathode tool is used to machine large-size workpieces, then tool size limitations are avoided, but machining efficiency decreases
Solution Approach 1:
Multiple conductive blocks are merged into a single cathode tool assembly, creating a compound tool that functions as one integrated machining unit. This merging allows the small-diameter tool to machine large workpiece surfaces efficiently by distributing machining operations across multiple blocks simultaneously, maintaining productivity while adapting to large-size workpieces.
Solution Approach 2:
The cathode tool is designed with multi-functional conductive blocks that can perform different machining functions depending on their position and activation. This universality allows a single small-diameter tool to handle various machining tasks on large workpieces, achieving both adaptability and efficiency.
3Manufacturing precision
If traditional computer numerical control milling is used for aero-engine casing, then complex shapes can be machined, but machining procedures are complicated and cycle time is long
Solution Approach 1:
The patent replaces traditional mechanical milling with electrochemical machining using a revolving cathode tool. This substitution eliminates complex mechanical tool paths and multi-step procedures, achieving complex shape machining through controlled electrochemical dissolution, thereby significantly reducing machining cycle time while maintaining precision.
Solution Approach 2:
The electrochemical machining process enables continuous material removal without the intermittent tool changes, repositioning, and setup required in traditional milling. The revolving cathode tool maintains continuous contact with the workpiece, ensuring uninterrupted machining action that reduces cycle time while achieving complex geometries.
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 solution enables efficient one-time machining of large-sized parts with complex surface structures, reducing manufacturing costs and time, and improving the tool's universality by allowing adjustments for different convex structure positions.
Implementation Method 1
Electrochemical machining is based on the principle of electrochemical anodic dissolution to realize efficient removal of materials
Data Source
AI summary
A revolving cathode tool and method for co-rotating electrochemical machining of an inner wall of an aero-engine casing are provided, and relates to the technical field of electrochemical machining. The co-rotating electrochemical machining revolving cathode tool comprises a power supply, a cathode shaft, an anode workpiece and a flexible cathode assembly. The cathode shaft is electrically connected with a cathode of the power supply. The anode workpiece is electrically connected with an anode of the power supply. One end of the cathode shaft is connected with the flexible cathode assembly. The problem that a non-array complex structure of the inner wall of the aero-engine casing cannot be machined through counter-rotating electrochemical machining is fundamentally solved. The diameter of the cathode tool is 1/n of the diameter of the anode workpiece.