Rotary Induction Heating for Uniform Workpiece Treatment
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Solution Overview
Problem
Conventional induction heating methods fail to provide uniform heating, especially for non-symmetrical workpieces, which is unacceptable for applications like quenching, forging, and coating due to uneven heat distribution.
Innovation Solution
A rotary heating apparatus with a rotatable shaft positioned perpendicular to the induction coil's axis, allowing the workpiece to rotate within the coil's magnetic field in a plane that includes or is parallel to the coil's axis, ensuring even exposure to multiple lines of flux for consistent heating regardless of workpiece thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional induction heating is used with stationary workpieces, then the heating process is simple, but the heating uniformity is poor especially for non-symmetrical parts
Solution Approach 1:
The patent applies the dynamics principle by transforming the stationary workpiece into a rotating one. The workpiece is mounted on a rotatable shaft that rotates within the induction coil, allowing different surfaces of the workpiece to sequentially pass through high-flux regions. This dynamic motion ensures uniform heating distribution across the entire workpiece surface, particularly solving the heating uniformity problem for non-symmetrical parts while maintaining a relatively simple apparatus structure.
2Manufacturing precision
If the workpiece is rotated inside the induction coil, then heating uniformity improves, but the risk of contact between the shaft and coil increases
Solution Approach 1:
The patent applies the dimensionality change principle by repositioning the rotation axis. Instead of rotating the workpiece along the coil's central axis (longitudinal rotation), the workpiece rotates on a shaft whose axis is perpendicular to the coil's central axis. This dimensional change creates sufficient clearance between the rotating shaft and the coil windings, eliminating contact risks while maintaining effective heating through sequential exposure of different workpiece surfaces to the magnetic field.
3Manufacturing precision
If the rotatable shaft axis is perpendicular to the induction coil axis, then even non-symmetrical workpieces are heated uniformly, but the device complexity increases
Solution Approach 1:
The patent applies the universality principle by designing a perpendicular shaft configuration that can handle both symmetrical and non-symmetrical workpieces with a single apparatus design. The perpendicular orientation of the shaft relative to the coil axis creates a universal heating pattern that ensures all surfaces of any workpiece shape will eventually pass through the high-flux regions during rotation. This multi-functional capability achieves consistent heating uniformity across different workpiece geometries without requiring multiple specialized heating setups.
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
Ensures uniform heating of both symmetrical and non-symmetrical workpieces by maintaining continuous rotation through a fixed magnetic field, addressing the issue of uneven heat distribution in conventional induction heating.
Implementation Method 1
an induction coil providing a magnetic field therewithin
Implementation Method 2
the rotating workpiece crosses through multiple lines of flux of the magnetic field
Implementation Method 3
for consistent uniform heating of the workpiece
Data Source
AI summary
A rotary heating apparatus to heat evenly symmetrical and/or non-symmetrical workpieces. A rotatable shaft holds directly or indirectly one or more workpieces. The shaft has a first major central elongated axis. An induction coil providing a magnetic field and has a second major central elongated axis. The coil is fabricated with an open space in a side of the coil. The open space is configured and dimensioned to accommodate the passage of the shaft while avoiding contact between the shaft and any portion of the coil. The shaft is arranged so that said first major axis is positioned perpendicular to the second major central elongated axis. The shaft rotates workpieces within the coil in a plane which includes the second axis or in a plane which is parallel to the axis so that the rotating workpiece crosses through multiple lines of flux of the magnetic field to ensure even exposure of the workpiece to the magnetic field provided by the coil for consistent uniform heating of the workpiece regardless of different thicknesses of the workpiece.