Two-Color Pyrometer for Process Temperature Measurement During Machining

Tapetado, A.; Díaz-Álvarez, José; Miguélez, M.H.; Vázquez, Carmen

doi:10.1109/jlt.2015.2513158

Cited by 50 publications

(54 citation statements)

References 14 publications

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“…Additional advantages are offered by two-color pyrometers [ 15 ] dealing with the ratio of optical powers at two spectral bands to bypass the dependence of emissivity on the temperature. A wide theoretical background about detecting with two-color pyrometers is available in the literature [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Laser Heating of Aluminum and Model Validation via Two-Color Pyrometer and Shape Assessment

Alfieri

2018

Materials

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The modeling of laser-based processes is increasingly addressed in a competitive environment for two main reasons: Preventing a trial-and-error approach to set the optimum processing conditions and non-destructive real-time control. In this frame, a thermal model for laser heating in the form of non-penetrative bead-on-plate welds of aluminum alloy 2024 is proposed in this paper. A super-Gaussian profile is considered for the transverse optical intensity and a number of laws for temperature-dependent material properties have been included aiming to improve the reliability of the model. The output of the simulation in terms of both thermal evolution of the parent metal and geometry of the fusion zone is validated in comparison with the actual response: namely, a two-color pyrometer is used to infer the thermal history on the exposed surface around the scanning path, whereas the shape and size of the fusion zone are assessed in the transverse cross-section. With an average error of 3% and 4%, the model is capable of predicting the peak temperature and the depth of the fusion zone upon laser heating, respectively. The model is intended to offer a comprehensive description of phenomena in laser heating in preparation for a further model for repairing via additive manufacturing.

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Section: Introductionmentioning

confidence: 99%

Simulation of Laser Heating of Aluminum and Model Validation via Two-Color Pyrometer and Shape Assessment

Alfieri

2018

Materials

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“…Figure 2 shows the scheme of the setup used to measure the work piece temperature [ 20 , 21 , 22 ]. The temperature sensor is made of standard glass optical fiber with core (d Core ) and cladding (d Cladding ) diameters of 62.5 and 125 μm, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…In this paper, a simplified model based on a finite element (FE) approach for simulation of steady temperature distribution in turning Inconel 718 is presented. The model is calibrated with precise temperature measurements made using a special purpose device, based on a two-color fiber-optic pyrometer [ 20 , 21 , 22 ]. The aim of this paper is to provide a measurement method for temperature control during the process and to provide information for the calibration of the numerical model suitable for prediction of thermal issues in Inconel cutting.…”

Section: Introductionmentioning

confidence: 99%

Temperature Measurement and Numerical Prediction in Machining Inconel 718

Díaz-Álvarez

Tapetado

Vázquez

et al. 2017

Sensors

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Thermal issues are critical when machining Ni-based superalloy components designed for high temperature applications. The low thermal conductivity and extreme strain hardening of this family of materials results in elevated temperatures around the cutting area. This elevated temperature could lead to machining-induced damage such as phase changes and residual stresses, resulting in reduced service life of the component. Measurement of temperature during machining is crucial in order to control the cutting process, avoiding workpiece damage. On the other hand, the development of predictive tools based on numerical models helps in the definition of machining processes and the obtainment of difficult to measure parameters such as the penetration of the heated layer. However, the validation of numerical models strongly depends on the accurate measurement of physical parameters such as temperature, ensuring the calibration of the model. This paper focuses on the measurement and prediction of temperature during the machining of Ni-based superalloys. The temperature sensor was based on a fiber-optic two-color pyrometer developed for localized temperature measurements in turning of Inconel 718. The sensor is capable of measuring temperature in the range of 250 to 1200 °C. Temperature evolution is recorded in a lathe at different feed rates and cutting speeds. Measurements were used to calibrate a simplified numerical model for prediction of temperature fields during turning.

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“…One field of application that requires precise temperature measurements, that are acquired quickly under harsh conditions, is machine tool surface temperature measurement [ 8 , 9 , 10 , 11 ]. Machining tool surface temperature measurements have often been acquired using embedded thermocouples [ 12 , 13 , 14 , 15 ] and increasingly by infrared thermography and thermometry [ 8 , 9 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…Accommodating these features necessitates an increased thermometer enclosure size and additional electronics for controlling the cooling and undertaking additional signal processing [ 30 ]. Development of an infrared thermometer that used an uncooled sensor and received the radiant signal without optical chopping, but had the capability of measuring machine tool temperatures, would advance machining tool temperature measurement [ 8 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Miniature Uncooled and Unchopped Fiber Optic Infrared Thermometer for Application to Cutting Tool Temperature Measurement

Heeley

Hobbs

Laalej

et al. 2018

Sensors

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A new infrared thermometer, sensitive to wavelengths between 3 μm and 3.5 μm, has been developed. It is based on an Indium Arsenide Antimony (InAsSb) photodiode, a transimpedance amplifier, and a sapphire fiber optic cable. The thermometer used an uncooled photodiode sensor and received infrared radiation that did not undergo any form of optical chopping, thereby, minimizing the physical size of the device and affording its attachment to a milling machine tool holder. The thermometer is intended for applications requiring that the electronics are located remotely from high-temperature conditions incurred during machining but also affording the potential for use in other harsh conditions. Other example applications include: processes involving chemical reactions and abrasion or fluids that would otherwise present problems for invasive contact sensors to achieve reliable and accurate measurements. The prototype thermometer was capable of measuring temperatures between 200 °C and 1000 °C with sapphire fiber optic cable coupling to high temperature conditions. Future versions of the device will afford temperature measurements on a milling machine cutting tool and could substitute for the standard method of embedding thermocouple wires into the cutting tool inserts. Similarly, other objects within harsh conditions could be measured using these techniques and accelerate developments of the thermometer to suit particular applications.

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Two-Color Pyrometer for Process Temperature Measurement During Machining

Cited by 50 publications

References 14 publications

Simulation of Laser Heating of Aluminum and Model Validation via Two-Color Pyrometer and Shape Assessment

Simulation of Laser Heating of Aluminum and Model Validation via Two-Color Pyrometer and Shape Assessment

Temperature Measurement and Numerical Prediction in Machining Inconel 718

Miniature Uncooled and Unchopped Fiber Optic Infrared Thermometer for Application to Cutting Tool Temperature Measurement

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