Magnetorheological Blisk Blade Support for Stable Thin-Wall Machining
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Solution Overview
Problem
The processing of blisk blades with complex shapes on nickel-based superalloy or titanium alloy blanks faces challenges due to weak local rigidity, leading to poor processing accuracy and efficiency, as existing methods fail to provide stable and flexible support during machining.
Innovation Solution
A magnetorheological support method using a fork structure and soft film to wrap magnetorheological fluid, which is excited by a magnetic field to achieve flexible support and damping, enhancing local rigidity and enabling automatic processing through an indexing turntable and soft film transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fillers are used to enhance support rigidity during blisk milling, then the support rigidity is improved, but the fillers become chips with tool cutting and coolant flowing, making it difficult to recover fillers and reuse coolant
Solution Approach 1:
The patent changes the physical state of the support material from solid fillers to magnetorheological fluid, which can transition between liquid and semi-solid states. In liquid state, the fluid can be easily pumped and reused; when magnetic field is applied, it transforms to semi-solid state providing the needed support rigidity during machining
Solution Approach 2:
The magnetorheological fluid undergoes phase transition from liquid to semi-solid state under magnetic field excitation. This allows the material to be in liquid form during coolant circulation and filler recovery, then transform to provide rigid support during the actual machining process
2Productivity
If the supporting location is changed from web side to end of inlet and outlet air duct, then processing efficiency and tool service life are improved, but processing accuracy is low
Solution Approach 1:
The patent applies local quality by using magnetorheological fluid that can be precisely positioned and activated only at the specific supporting location (end of inlet and outlet air duct). The magnetic field is applied locally to create support exactly where needed, providing both the productivity benefits of the new support location and the precision through localized rigid support
3Reliability
If vertical support force is provided on end surfaces of drums, then processing stability, surface quality and dimensional accuracy are improved, but the fixture is complicated and clamping process is cumbersome
Solution Approach 1:
The patent replaces the complex mechanical drum fixture system with a simpler magnetorheological fluid-based support system. Instead of mechanical drums and complex clamping mechanisms, the invention uses magnetic field-excited fluid that can provide vertical support forces through the air duct ends, achieving the same stability and accuracy with much simpler device architecture
4Adaptability or versatility
If magnetorheological fluid is used for flexible support, then adaptability to complex thin-wall parts is improved, but the system requires magnetic field excitation and control mechanisms
Solution Approach 1:
The magnetorheological fluid serves multiple functions: it acts as coolant during machining, provides flexible liquid support during transport and positioning, and transforms to semi-solid rigid support when magnetic field is applied. This multi-functionality reduces the need for separate support mechanisms, offsetting the control system complexity with operational versatility
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
The method ensures high processing accuracy and automatic support for blisk blades by controlling the solid-liquid conversion of magnetorheological fluid, providing effective damping and flexible support, thereby improving machining stability and efficiency.
Implementation Method 1
Magnetorheological fluid is an intelligent material with controllable morphology, can be cured rapidly (millisecond level) when excited by an applied magnetic field, so as to easily realize reversible liquid-solid phase transition at normal temperature
Implementation Method 2
Electric permanent magnets are symmetrically arranged at both ends of the fork structure to construct a uniform magnetic field that can realize a global excitation of magnetorheological fluid
Implementation Method 3
the magnetorheological fluid works in a shear mode to achieve damping force controlling by magnetic field
Data Source
AI summary
A magnetorheological support method for blisk processing is disclosed. In the method, a fork structure and a soft film are used to wrap magnetorheological fluid. The magnetorheological fluid is used for flow filling under certain pressure. The bulged soft film can conduct shape matching on the surface of a blisk blade. The magnetorheological fluid can be cured through magnetic field excitation, thereby ensuring the flexible support for a weak rigid component. Electric permanent magnets are symmetrically arranged at both ends of the fork structure to construct a uniform magnetic field that can realize a global excitation of magnetorheological fluid, so that the magnetorheological fluid works in a shear mode to achieve damping force controlling by magnetic field. The solid-liquid conversion of the magnetorheological fluid is controlled by an electric permanent magnet field.