Blisk Blade Insert Compensates Groove Inclination
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Solution Overview
Problem
The manufacturing method for composite material blades using Ceramic Matrix Composite (CMC) restricts the orientation discontinuities, making it challenging to integrate them into a disk without jamming, as the required inclinations for bulb faces and groove faces are difficult to align effectively.
Innovation Solution
The design includes a bulb with two upper faces having a second inclination less than the groove's overhanging faces, with inserts between the bulb and disk, comprising main, external, and internal parts that compensate for inclination differences and provide clearance to prevent jamming, allowing the blade to drop when centrifugal forces cease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bulb is made from composite material using casting method, then the manufacturing process is simplified, but the inclination of the upper part of the bulb cannot exceed about 30° while the groove face inclination must be at least 40° to prevent jamming
Solution Approach 1:
An insert is introduced as an intermediary element between the bulb and the groove. The insert comprises a first part bearing on the bulb and a second part bearing on the groove, allowing the bulb to have a smaller inclination angle (30°) while the groove maintains a larger inclination angle (40°), thus preventing jamming during assembly and operation
Solution Approach 2:
The connection between the bulb and groove is divided into separate functional elements: the bulb with its upper part at a specific inclination, the insert with bearing surfaces at different inclinations, and the groove with its overhanging faces. This segmentation allows each component to be optimized independently for its specific function
2Reliability
If the groove faces are inclined at least 40° to prevent jamming, then the blade can be securely held during operation, but the bulb inclination cannot exceed 30° due to composite material manufacturing constraints
Solution Approach 1:
The insert acts as a mediator that bridges the inclination angle difference between the bulb (max 30°) and the groove (min 40°). The first bearing surface of the insert is inclined to match the bulb's upper face, while the second bearing surface is inclined to match the groove's overhanging face, thus transmitting forces effectively while accommodating the manufacturing constraints
Solution Approach 2:
The insert changes the effective inclination parameters at different locations. The first bearing surface has an inclination matching the bulb's upper face (≤30°), while the second bearing surface has an inclination matching the groove's overhanging face (≥40°), allowing the system to satisfy both manufacturing constraints and operational requirements
3Adaptability or versatility
If inserts are added between the bulb and disk to compensate for inclination differences, then the blade can be integrated into the disk, but the device complexity increases
Solution Approach 1:
The insert is designed as a multi-functional element that simultaneously: (1) compensates for the inclination angle difference between the bulb and groove, (2) provides bearing surfaces for force transmission, (3) prevents jamming during assembly and operation, and (4) maintains the structural integrity of the blade-disk connection. This multi-functionality justifies the added complexity by solving multiple problems with a single component
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 design enables the use of composite material blades in a metal disk with inserts that maintain support under centrifugal forces and prevent jamming by allowing the blade and inserts to drop, ensuring reliable operation and assembly.
Implementation Method 1
despite centrifugal forces that occur during operation
Implementation Method 2
the blade and then the inserts can drop towards the bottom of the groove when centrifugal forces cease
Data Source
AI summary
A layout of a blisk includes two inserts housed between the bulb of the blade and the wall of a groove in a disk to compensate for variations in inclination between the overhanging faces of the groove and the upper faces of the bulb at their central part. This construction makes it possible to select blades for which upper faces of the bulb are slightly inclined relative to the radial direction, which facilitates their construction from a composite material.