Closed-Shape Workpiece Heating with Flux-Controlled Rotation
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Solution Overview
Problem
Thermal processing of cylindrical workpieces often results in overheating due to the overlap of hot zones generated by focused light sources during rotation, leading to uneven heat treatment and potential damage.
Innovation Solution
Implementing a flux control procedure that adjusts the power of the lamp heat source and the rotational speed of the workpiece to ensure that only a portion of the surface is exposed to the light at any given time, using arc lamps with an elliptical reflector to focus light onto a larger area and reduce overheating by controlling the heat flux and movement of the workpiece relative to the lamp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If focused light sources are used for thermal processing of cylindrical workpieces, then heating efficiency is improved, but overheating and uneven heat treatment occur due to hot zone overlap during rotation
Solution Approach 1:
The patent divides the continuous hot zone into multiple discrete heating zones by using multiple independently controlled laser sources arranged circumferentially. Each laser creates a separate heating zone that can be controlled individually, preventing the overlap and overheating that occurs with a single continuous hot zone. This segmentation allows precise control over which portions of the workpiece receive heat at any given time.
Solution Approach 2:
The patent combines multiple laser heat sources into a unified thermal processing system that treats the entire circumferential surface of the workpiece. By merging multiple controlled heating zones into a coordinated system, the patent achieves uniform heat treatment across the entire surface while avoiding the overheating problems of single-source systems. The combined system maintains temperature uniformity through synchronized control of all laser sources.
2Area of stationary object
If the workpiece is rotated to present different portions to the heat source, then complete surface coverage is achieved, but hot zones overlap and cause overheating
Solution Approach 1:
The patent implements dynamic control of the laser heating system by coordinating the rotation speed of the workpiece with the positioning and activation of multiple laser sources. The system continuously adjusts which lasers are active based on the workpiece's rotational position, ensuring that each surface area receives heat from only one laser zone at a time. This dynamic coordination prevents hot zone overlap while maintaining complete surface coverage.
Solution Approach 2:
The patent employs feedback control mechanisms that monitor the thermal state of the workpiece and adjust laser activation and rotation speed accordingly. Sensors detect temperature distribution and provide real-time feedback to the control system, which then modulates the laser sources to prevent overheating in any particular zone while ensuring complete surface coverage. This closed-loop control maintains temperature uniformity during rotation.
3Device complexity
If a single heat source is used, then device complexity is reduced, but the ability to control heat flux distribution and prevent overheating is limited
Solution Approach 1:
The patent segments the heating function into multiple independent laser sources distributed circumferentially around the workpiece. This segmentation enables precise control over heat flux distribution across different angular positions, allowing the system to prevent overheating by activating only the appropriate lasers at any given moment. The modular segmented design maintains manageable complexity while dramatically improving heat treatment precision.
Solution Approach 2:
The patent utilizes parameter changes by independently controlling the power output, activation timing, and positioning of multiple laser sources. By varying these parameters dynamically based on workpiece rotation position and thermal feedback, the system achieves precise heat flux distribution control. This parameter modulation allows the multi-source system to maintain heat treatment uniformity while managing device complexity through standardized laser modules.
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 method effectively reduces overheating and achieves more uniform thermal treatment of cylindrical workpieces by controlling the heat flux and movement, preventing hot zones from coinciding and maintaining a stable temperature profile.
Implementation Method 1
emitting lamp heat onto the perimeter surface of the closed shape workpiece from the lamp heat source
Implementation Method 2
emitting lamp heat onto the perimeter surface of the closed shape workpiece from the lamp heat source
Implementation Method 3
imparting relative motion of the closed shape workpiece such that the perimeter surface of the closed shape workpiece is moved relative to the lamp heat source
Data Source
AI summary
Systems and methods for heat treating closed shape workpieces are provided. In one example implementation, a method can include imparting relative motion of the closed shape workpiece such that the perimeter surface of the closed shape workpiece is moved relative to the lamp heat source from a first position where a first portion of the closed shape workpiece is presented to the lamp heat source to a second position where a second portion of the closed shape workpiece is presented to the lamp heat source. The method can include emitting lamp heat onto the perimeter surface of the closed shape workpiece from the lamp heat source during imparting of relative motion of the closed shape workpiece. The method can include implementing a flux control procedure during emitting of lamp heat onto the perimeter surface of the closed shape workpiece.