Shrink Chuck Temperature Sensing for Emissivity-Independent Heating
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Solution Overview
Problem
Existing shrinkage appliances for heat treatment of shrink chucks face challenges in accurately measuring temperature due to unknown emissivities of different materials and surfaces, leading to measurement errors.
Innovation Solution
The appliance employs multiple temperature sensors, preferably radiation detectors like pyrometers, inclined at angles between 30° and 60°, and optionally quotient pyrometers, to measure thermal radiation contactlessly, averaging or combining measurements to compensate for varying emissivities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a radiation thermometer is used for contactless temperature measurement, then temperature measurement is enabled without contact, but measurement accuracy deteriorates due to unknown emissivity of different materials and surfaces
Solution Approach 1:
The invention divides the temperature measurement task into multiple independent measurements by using several radiation thermometers positioned at different locations. Each thermometer measures temperature independently, and the results are combined (e.g., averaged) to obtain a representative temperature value that compensates for emissivity variations of individual measurement points.
Solution Approach 2:
The system uses multiple radiation thermometers simultaneously to measure different aspects of the workpiece temperature. By positioning thermometers at various locations and combining their readings, the system achieves universal temperature monitoring that is independent of the specific material or surface properties of the workpiece being measured.
2Device complexity
If a single radiation thermometer is positioned to measure temperature, then simple measurement structure is achieved, but measurement reliability deteriorates due to sensitivity to emissivity variations
Solution Approach 1:
Instead of relying on a single measurement point, the invention segments the measurement function across multiple radiation thermometers. This segmentation ensures that if one measurement is affected by emissivity issues, other measurements provide compensating data, thereby improving overall measurement reliability.
Solution Approach 2:
The system incorporates feedback by continuously monitoring temperature at multiple points and using this information to control the heating process. The control unit receives signals from all radiation thermometers and adjusts heating parameters based on the combined temperature data, improving process reliability and preventing overheating.
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 approach allows for accurate temperature measurement of shrink chucks independent of their emissivity, ensuring reliable heat treatment with improved safety and ease of handling.
Implementation Method 1
radiation detectors like pyrometers, to measure thermal radiation contactlessly
Implementation Method 2
Those radiation thermometers used therein in the cited prior art operate on the basis of infrared radiation/thermal radiation emitted by the body
Data Source
AI summary
An appliance for heat treatment or inductive heating or cooling of shrink chucks for shaft-type tools or a shrinkage appliance or cooling appliance or shrinkage appliance with a cooling appliance, includes a receiving device or opening receiving a shrink chuck, a heat treatment unit surrounding the receiving device relative to a central axis, an induction coil arrangement or cooling unit, and a measuring unit for temperature measurement of the shrink chuck. For exactly measuring shell temperatures of chucks in receiving openings, the measuring unit has temperature sensors around the receiving device or one temperature sensor inclined around the central axis for contactless detection of the shell temperature, or the measuring unit has sensors around the receiving device including a first temperature sensor for contactless detection of a shell temperature, and a different type of second sensor for detecting another property of the shrink chuck in the receiving device.