Hydraulic Rotor Shaft Extraction with Integrated Induction Heating
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Solution Overview
Problem
Conventional extrusion tools for removing a rotor shaft from a turbomachine using press fits often damage both the shaft and the structure due to narrow tolerances, and previous heating methods are inefficient or inaccessible.
Innovation Solution
A hydraulic extrusion tool with a coupling mechanism and integrated induction devices that heat the press fit region without heating the rotor shaft, allowing simultaneous hydraulic pressure and targeted induction heating to expand the press fit, enabling safe and rapid extraction of the rotor shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional extrusion tools are used to remove the rotor shaft, then the extraction can be performed, but both the rotor shaft and the disk may be damaged due to narrow press fit tolerances
Solution Approach 1:
The invention changes the physical state of the press fit region by applying induction heating, which increases the temperature and causes thermal expansion of the disk's inner diameter. This parameter change (temperature increase) allows the press fit to be loosened without mechanical damage, enabling safe extraction of the rotor shaft while maintaining the integrity of both the shaft and disk
Solution Approach 2:
The invention replaces the purely mechanical extrusion process with a combined thermal-mechanical process. Instead of applying only mechanical force through the hydraulic actuator, the system first applies thermal energy through induction heating to expand the press fit region, thereby reducing the mechanical force required and preventing damage to the rotor shaft and disk
2Productivity
If previous extrusion tools are used, then extrusion can be performed, but suitable access for heating devices is not provided
Solution Approach 1:
The invention merges the extrusion tool and the induction heating device into a single integrated system. The heating device is built into the extrusion tool structure, allowing both functions (heating and mechanical extrusion) to be performed by one tool. This integration eliminates the need for separate heating devices and provides all necessary functions through a single unified tool that can access the press fit region effectively
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 tool allows for the safe and rapid extraction of the rotor shaft without damaging it or the structure, as the induction heat is precisely applied to the press fit, eliminating unnecessary cooling phases and minimizing tilting moments.
Implementation Method 1
at least one induction device that is configured for the purpose of heating the structure by means of induction in the region of the press fit
Implementation Method 2
heat the inner diameter of the disk by means of a heating device, so that the disk expands
Implementation Method 3
the first tool part has an actuator, in particular, a hydraulically actuated actuator, that is configured for the purpose of pushing or pulling the rotor shaft out of the structure against the press fit
Data Source
AI summary
The present invention relates to a hydraulic extrusion tool for extruding a rotor shaft for a turbomachine, and a corresponding method. The turbomachine has a structure that is fastened to the rotor shaft by a press fit. The extrusion tool has a first tool part that is configured for the purpose of being arranged on a first side of the structure, and which has a coupling mechanism that is configured for the purpose of coupling the first tool part to the structure, in such a way that the first tool part and the structure cannot move away from each other, at least in one direction along an axis of the rotor shaft; and an induction device that is configured for the purpose of heating the structure by induction in the region of the press fit.