Aircraft Turboshaft Casing Deburring via Rotational Scraper Tool
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Solution Overview
Problem
The existing methods for machining aircraft turbine engine casings are inefficient and hazardous, as they require manual deburring processes that involve harmful dust and risk operator injury, and existing automated solutions are costly and require specialized equipment.
Innovation Solution
A method that integrates a scraper tool into a milling device to automate the deburring process by rotating the casing at the same milling speed, allowing the scraper tool to remove burrs without changing the orientation of the milling device, using guide rollers and elastic means for precise deburring of both inner and outer edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual deburring tools are used, then operators can remove burrs, but harmful dust is projected and operator injury risk increases
Solution Approach 1:
The patent replaces manual mechanical deburring tools with an automated scraping system that uses the rotational motion of the casing itself to perform deburring. The scraping tool is held against the casing edge while the casing rotates, eliminating the need for operators to manually handle deburring tools and thereby preventing harmful dust projection and operator injury.
Solution Approach 2:
The casing itself provides the rotational motion needed for deburring by rotating in the milling device after milling operation. This self-service approach eliminates the need for separate manual deburring operations and allows the deburring process to be performed automatically as the casing rotates under its own momentum or driven by the milling device.
2Ease of manufacture
If manual deburring is performed, then burrs can be removed, but handling time increases and results vary by operator skill
Solution Approach 1:
The patent replaces manual deburring operations with an automated scraping system where the casing rotates in the milling device and a scraping tool removes burrs automatically. This eliminates operator skill variability and reduces handling time from approximately 15 minutes per casing to a much shorter automated process.
Solution Approach 2:
The patent combines the milling operation and deburring operation into a single integrated process. The casing is milled and then immediately deburred in the same milling device without removal or repositioning, merging two previously separate manual operations into one automated workflow that significantly reduces total handling time.
3Extent of automation
If specialized deburring robots are used, then automation is achieved, but equipment cost increases
Solution Approach 1:
The patent makes the milling device multi-functional by enabling it to perform both milling and deburring operations. The scraping tool can be mounted in the milling device's tool holder, allowing the same equipment to execute multiple operations without requiring specialized deburring robots or additional dedicated machinery.
Solution Approach 2:
The patent combines milling and deburring functions into a single integrated operation using the same milling device. The scraping tool is positioned and activated within the existing milling device framework, eliminating the need for separate specialized deburring equipment and reducing overall system complexity.
4Ease of operation
If the casing is removed from the milling device for deburring, then manual handling is required, but operator injury risk increases
Solution Approach 1:
The patent combines the milling and deburring operations within the same milling device without removing the casing. The scraping tool is mounted and operated within the existing device framework, allowing both operations to be performed on the casing while it remains securely positioned in the milling device, thereby eliminating operator handling risks.
Solution Approach 2:
The casing remains in the milling device and rotates in place to enable deburring without requiring removal or manual handling. The scraping tool is positioned to contact the rotating casing edge, allowing the deburring operation to be performed automatically while the casing stays secured in the milling device throughout the process.
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 method reduces the duration of the machining process, minimizes operator risk, and ensures consistent results without the need for manual handling, allowing for safer and more efficient deburring of aircraft turbine engine casings.
Implementation Method 1
a step of rotating, along the axis of the casing, the frame at a milling rotation speed; a step of deburring said edge of the casing so as to remove at least one burr formed in the vicinity of said edge following the step of milling, method in which, the milling device comprising a scraper tool during step d deburring, the scraper tool machines the burr by turning during the rotation of the housing at the milling rotational speed
Data Source
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AI summary
A method for machining a casing of an aircraft turboshaft engine, the casing including an upstream edge and a downstream edge. The method includes: positioning the casing in a chassis; rotating the chassis at a rotational milling speed; milling a downstream edge and/or upstream edge of the casing by a milling device, so as to correct axial length of the casing; and deburring the casing edge so as to remove at least one burr formed in a vicinity of the edge as a result of the milling, the milling device including a scraper tool which turn-machines the burr as the casing is rotated.