Induction Coil Unit With Adjustable Pole Pieces
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Solution Overview
Problem
Conventional induction coil units inadequately heat rotationally symmetrical components uniformly in both axial and circumferential directions, leading to non-uniform thermal expansion and potential overheating damage, particularly when heating sleeve parts of tool holders for shrinking rotating tools.
Innovation Solution
The induction coil unit features a central retaining area with evenly distributed soft-magnetic pole pieces that guide magnetic flux in the opposite direction circumferentially, with end surfaces designed to maximize contact with the component's surface and reduce stray fields, and includes a yoke ring and adjustable pole pieces to ensure uniform heating and accommodate various diameters and coning angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional induction coil units with stationary coils are used to heat rotationally symmetrical components, then the device structure is simple, but the heating uniformity in axial and circumferential directions deteriorates
Solution Approach 1:
The induction coil unit is divided into multiple independent pole pieces (typically 3-6) distributed around the circumference, each with its own coil. This segmentation allows each pole piece to be independently positioned and adjusted, enabling uniform heating across the workpiece surface while maintaining a relatively simple overall structure.
Solution Approach 2:
The pole pieces are made radially movable relative to the common yoke, allowing dynamic adjustment of the air gap between pole pieces and workpiece. This dynamic capability enables adaptation to different workpiece diameters and ensures consistent heating uniformity without requiring complex fixed structures.
2Adaptability or versatility
If the pole pieces are fixed at a certain distance from the component surface, then the device structure is simple, but the adaptability to components with different diameters deteriorates
Solution Approach 1:
The pole pieces are designed with radial adjustability, allowing them to move closer to or farther from the workpiece surface. This dynamic positioning capability enables the same induction coil unit to accommodate workpieces with different diameters while maintaining optimal heating conditions, without requiring multiple fixed configurations.
Solution Approach 2:
The induction coil unit with adjustable pole pieces serves multiple functions: it can heat workpieces of various diameters, adjust to different coning angles, and maintain uniform heating across all configurations. This multi-functionality eliminates the need for multiple specialized devices, reducing overall system complexity.
3Adaptability or versatility
If the coils are firmly connected to the cores, then the device structure is simple, but the adaptability to different heating requirements deteriorates
Solution Approach 1:
The coils are designed to be movable with their respective pole pieces, rather than being firmly fixed to a stationary core structure. This dynamic connection allows the coils to move radially with the pole pieces, maintaining optimal positioning for different workpiece sizes and heating requirements while keeping the connection structure relatively simple.
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 achieves more uniform heating in both axial and circumferential directions, preventing overheating and allowing for efficient shrinking and heating of tool holders with different diameters and coning angles, while reducing production costs and complexity.
Implementation Method 1
a plurality of coils which can be fed with alternating current, to produce magnetic fluxes in the pole pieces
Implementation Method 2
the magnetic flux produced by the coils produces induced currents, which run in the circumferential direction, in the sleeve part to be heated
Implementation Method 3
induction coil unit for heating a component which is rotationally symmetrical relative to an axis and is composed of electrically conductive material
Data Source
AI summary
According to the invention, for shrinking and expanding a tool in the bush part (3) of a tool holder, an induction coil unit (1), in which several polar parts (25) made of a soft magnetic material are radially adjusted in the yoke ring made of a soft magnetic material, is provided. Said polar parts have end faces (29) which are inclined in relation to the axis of rotation (7) of the bush part (3) and can be kept in a linear contact with a conical peripheral surface (31) of the bush part (3) which holds a the tool (11) in a press fit manner. In order to avoid possible local overheating of the bush part (3), the area (39) of the end face (29) parallel to the axis is connected on the output side of the tool to an area (33) of the end face (29) inclined in relation to the axis of rotation (7).