Measurement of Grinding Temperature of Active Grains Using Infrared Radiation Pyrometer with Optical Fiber

Ueda, Takashi; Tanaka, Hisataka; Torii, Akito; Matsuo, Tetsuo

doi:10.1016/s0007-8506(07)62472-x

Cited by 30 publications

(7 citation statements)

References 3 publications

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“…The thermocouple output voltage is amplified by a signal conditioning extension -SCXI 1100 -with cold junction compensation and sampled at 1.25 MHz by a NI 6071-E data acquisition device. The sampling rate and the dynamic response of the acquisition device are faster than Ueda's conditions (1 µs, 200 kHz) for the infrared Pyrometer method [10].…”

Section: Description Of the Single Pole Thermocouple And Acquisition mentioning

confidence: 97%

“…In the opposite case, a large number of individual grit sources must be considered. If the thermal load is approximated by a continuous heat source moving at the workpiece velocity, the accurate determination of the heat partition ratio and the thermal balance requires the knowledge of the temperature close to the grinding zone (by thermocouple [1][2][3]8,9], optical fiber [10] or thermography method [11,12]), the actual contact length between the wheel and the workpiece [13], the shape of the heat source (uniform, right angled triangle, scalene triangle [9], parabolic [11]), the effect of contact angle for deep grinding [12,14], the convective heat transfer to the coolant [2,9] and the quantity of heat carried away in the chips. The contact angle is neglected in shallow grinding leading to the assumption of a heat source moving in the plane of the ground surface.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of grinding temperatures using a foil/workpiece thermocouple

Lefebvre

Lanzetta

Lipiński

et al. 2012

International Journal of Machine Tools and Manufacture

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The high temperature generated in abrasive processes is the main factor responsible for thermal damage to a ground surface. It can be predicted through the thermal balance of the heat fluxes in the process. Such predictions can be experimentally verified using a foil/workpiece thermocouple. To estimate the thermal behaviour of such a sensor, it was dynamically calibrated with a laser beam to measure its frequency response. It was found that the response of the sensor has a time constant dependant on the thermal load and cannot be modelled by a simple first order function. In the calibration conditions used, the sensor is fast enough to measure the surface temperature with a time constant less than 100 microseconds.A high frequency acquisition system allows the signal to be measured at the local grit scale so that the activity of grits and the contact stability between the foil and the workpiece during grinding can be studied. By using the peak temperature and the local cooling after a peak, suitably processed, a local background temperature can be defined. It is shown that this background temperature can be evaluated more accurately by matching the global cooling curve to a finite element solution. The temperatures obtained from the local minima of the local diffusive cooling curve agree better with measured results than a temperature obtained by low pass filtering, which can overestimate the background temperature and so the partition ratio.Keywords: grinding; temperature; thermocouple; dynamic calibration; heat transfer; signal processing Measurement of grinding temperatures using a foil/workpiece thermocouple AbstractThe high temperature generated in abrasive processes is the main factor responsible for thermal damage to a ground surface. It can be predicted through the thermal balance of the heat fluxes in the process. Such predictions can be experimentally verified using a foil/workpiece thermocouple. To estimate the thermal behaviour of such a sensor, it was dynamically calibrated with a laser beam to measure its frequency response. It was found that the response of the sensor has a time constant dependant on the thermal load and cannot be modelled by a simple first order function. In the calibration conditions used, the sensor is fast enough to measure the surface temperature with a time constant less than 100 microseconds.A high frequency acquisition system allows the signal to be measured at the local grit scale so that the activity of grits and the contact stability between the foil and the workpiece during grinding can be studied. By using the peak temperature and the local cooling after a peak, suitably processed, a local background temperature can be defined. It is shown that this background temperature can be evaluated more accurately by matching the global cooling curve to a finite element solution. The temperatures obtained from the local minima of the local diffusive cooling curve agree better with measured results than a temperature obtained by low pass filtering, which can overestimate...

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Section: Description Of the Single Pole Thermocouple And Acquisition mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Measurement of grinding temperatures using a foil/workpiece thermocouple

Lefebvre

Lanzetta

Lipiński

et al. 2012

International Journal of Machine Tools and Manufacture

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“…The first studies to measure IR temperatures in a grinding operation were presented in the 1990s by Ueda et al In [16], the authors used an optic fiber connected to a simple photodiode (monochromatic) to measure the temperature of the abrasive grits on the grinding wheel. The experiments were carried out under dry grinding conditions and the optic fiber was located in a fixed fiber holder just after the contact zone (ɸ = 45°).…”

Section: Introductionmentioning

confidence: 99%

On the Influence of Infra-Red Sensor in the Accurate Estimation of Grinding Temperatures

Urgoiti

Barrenetxea²,

Sánchez

et al. 2018

Sensors

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Workpiece rejection originated by thermal damage is of great concern in high added-value industries, such as automotive or aerospace. Surface temperature control is vital to avoid this kind of damage. Difficulties in empirical measurement of surface temperatures in-process imply the measurement in points other than the ground surface. Indirect estimation of temperatures demands the use of thermal models. Among the numerous temperature measuring techniques, infra-red measurement devices excel for their speed and accurate measurements. With all of this in mind, the current work presents a novel temperature estimation system, capable of accurate measurements below the surface as well as correct interpretation and estimation of temperatures. The estimation system was validated by using a series of tests in different grinding conditions that confirm the hypotheses of the error made when measuring temperatures in the workpiece below the surface in grinding. This method provides a flexible and precise way of estimating surface temperatures in grinding processes and has shown to reduce measurement error by up to 60%.

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“…Ueda et al [43][44][45] used an infrared radiation pyrometer and optical fibers to measure the single grain temperature, even right after the grain passed the ground surface. By using an improved system equipped with a two-color pyrometer with a fused fiber coupler [46], grain-workpiece interface temperature was measured.…”

Section: Introductionmentioning

confidence: 99%

On a stochastically grain-discretised model for 2D/3D temperature mapping prediction in grinding

Axinte

2017

International Journal of Machine Tools and Manufacture

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Excessive grinding heat might probably lead to unwanted heat damages of workpiece materials, most previous studies on grinding heat/temperature, however, assumed the wheel-workpiece contact zone as a moving band heat source, which might be not appropriate enough to capture the realistic situation in grinding. To address this, grinding temperature domain has been theoretically modeled in this paper by using a stochastically grain-discretised temperature model (SGDTM) with the consideration of grain-workpiece micro interactions (i.e. rubbing, ploughing and cutting), and the full 2D/3D temperature maps with highly-localised thermal information, even at the grain scale (i.e. with the thermal impacts induced by each individual grain), has been presented for the first time. To validate theoretical maps, a new methodological approach to capture 2D/3D temperature maps based on an array of sacrificial thermocouples have also been proposed. Experimental validation has indicated that the grinding temperature calculated by SGDTM showed a reasonable agreement with the experimental one in terms of both 1D temperature signals (i.e. the signals that are captured at a specific location within the grinding zone) and the 2D/3D temperature maps of the grinding zone, proving the feasibility and the accuracy of SGDTM. This study has also proved that, as expected, the heat fluxes are neither uniformly-distributed along the wheel width direction nor continuous along the workpiece feed direction. The proposed SGDTM and the temperature measurement technique are not only anticipated to be powerful to provide the basis for the prevention of grinding thermal damage (e.g. grinding burns, grinding annealing and rehardening), but also expected to be meaningful to enhance the existing understanding of grinding heat/temperature than using the common approach depending on the single thermocouple technique.

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Measurement of Grinding Temperature of Active Grains Using Infrared Radiation Pyrometer with Optical Fiber

Cited by 30 publications

References 3 publications

Measurement of grinding temperatures using a foil/workpiece thermocouple

Measurement of grinding temperatures using a foil/workpiece thermocouple

On the Influence of Infra-Red Sensor in the Accurate Estimation of Grinding Temperatures

On a stochastically grain-discretised model for 2D/3D temperature mapping prediction in grinding

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