Temperature and energy partition in minimum quantity lubrication-MQL grinding process

Hadad, Mohammadjafar; Tawakoli, Taghi; Sadeghi, M. H.; Sadeghi, Behzad

doi:10.1016/j.ijmachtools.2011.11.010

Cited by 181 publications

(64 citation statements)

References 10 publications

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“…This energy partition is in close to the 65 % value obtained with an AISI 1020 steel workpiece and aluminum oxide wheel by the two matching methods described in the article of Malkin and Guo [33]. The partition ratio (and so the heat flux transmitted to the workpiece) can be evaluated using the following expression [2,3,23]:…”

Section: Experimental Results and Inverse Methods For Determining The supporting

confidence: 75%

“…The optimisation of the grinding process requires good knowledge of both these temperatures. Environmental and economical considerations have led many workers to use the maximum background temperature as a performance indicator in order to validate the effectiveness of innovative cooling solutions, such as MQL [1,2], mist jet cooling [3] and to optimize the grinding hardening process using dry air and liquid nitrogen [4].…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…Several thermoelectric methods have been developed to measure the grinding temperature: a standard thermocouple welded to the bottom of a blind hole [2,3,8,9], or a single or double pole grindable thermocouple in the shape of a foil or wire [1,15]. The intrusive method can require many corrections because of systematic errors due to the thermal inertia [16,17], the position of the junction in relation to the ground surface, the presence of the hole [18], the constitutive materials of thermocouples [19] and the contact resistance.…”

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: Experimental Results and Inverse Methods For Determining The supporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measurement of grinding temperatures using a foil/workpiece thermocouple

Lefebvre

Lanzetta

Lipiński

et al. 2012

International Journal of Machine Tools and Manufacture

View full text Add to dashboard Cite

show abstract

“…Although the amount may vary greatly depending on the materials, processes and the tools as some materials are naturally more lubricant than others, some processes are better able to get the fluid to the right place, and bigger tools need more lubricant than smaller ones [3]. MQL has been proven to be effective in terms of tool wear for various machining like grinding [4,5], milling [6,7] turning [8,9] and many more. MQL has larger scope to be applied in mini to micromachining as well due to the requirement of less heat removal rate and effective chip removal [3].…”

Section: Introductionmentioning

confidence: 99%

Minimum Quantity Lubrication (MQL) and its Effect on Tool Wear During Miniature Drilling :an Experimental Study

Mohamad

Bahar

2016

IJEMM

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Miniature drilling is widely used in industries including electronics and reconstructive surgeries to create small sized holes. Chip removal and effective supply of coolant are the two limiting factors that make the process more complex compared to other meso scale machining processes and also contribute to the tool wear. The tool wear in the process is mainly caused by the interaction, motion and chip production between the tool and work piece. Uniform supply of coolant must be ensured to reach the drilled cavity to keep the tool wear to a minimal level. This study includes experimental investigation of the tool condition after applying Minimum Quantity Lubrication (MQL) system as a greener approach as the name indicates. The tool condition with MQL has also been compared with dry and flood cooling. Two different types of drill bit materials (High Speed Steel and Carbide) have been tested under same experimental condition to drill through Aluminum Alloy 6061 and it has been found that overall performance in terms of tool condition after applying MQL was better compared to the other two methods. The overall wear propagation area was measured for both the conditions. It was seen, the wear propagation covered minimal area with MQL while for flood and dry condition wear was spread over a bigger area on flank.

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The Effect of Temperature on Magnetic Properties and Surface Integrity in Nd₂Fe₁₄B Permanent Magnets, Under Dry and Wet Grinding for Automotive Applications

Cestone,

Melkote,

Liverani

et al. 2024

Adv Eng Mater

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Electric motors transform the electrochemical energy into mechanical energy needed for the vehicles’ motion. Given that the transition from internal combustion engines to electric vehicles is likely to be the main driver of sustainable transportation, high‐performing electric motors will be increasingly important for this transition. Herein, the effect of the grinding process on the surface integrity and magnetic properties of NdFeB permanent magnets are investigated. NdFeB permanent magnets are most commonly used in the fabrication of permanent magnet electric motors and they are usually ground during their fabrication process chain in order to create a high‐quality cylindrical rotor for subsequent mechanical assembly. In particular, the effects of wet and dry grinding processes on magnetic properties and surface integrity are studied and compared. Guided by a thermal model, the grinding process parameters are varied highlighting their effects on the underlying thermomechanical phenomena responsible for the changes in surface integrity and magnetic properties observed. Wet grinding proves to be a viable process for NdFeB magnets. Additionally, acceptable results are achieved with dry grinding, which is particularly appealing due to its sustainability. It is noteworthy that the range of process parameters yielding acceptable results is narrower.

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Temperature and energy partition in minimum quantity lubrication-MQL grinding process

Cited by 181 publications

References 10 publications

Measurement of grinding temperatures using a foil/workpiece thermocouple

Measurement of grinding temperatures using a foil/workpiece thermocouple

Minimum Quantity Lubrication (MQL) and its Effect on Tool Wear During Miniature Drilling :an Experimental Study

The Effect of Temperature on Magnetic Properties and Surface Integrity in Nd₂Fe₁₄B Permanent Magnets, Under Dry and Wet Grinding for Automotive Applications

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Temperature and energy partition in minimum quantity lubrication-MQL grinding process

Cited by 181 publications

References 10 publications

Measurement of grinding temperatures using a foil/workpiece thermocouple

Measurement of grinding temperatures using a foil/workpiece thermocouple

Minimum Quantity Lubrication (MQL) and its Effect on Tool Wear During Miniature Drilling :an Experimental Study

The Effect of Temperature on Magnetic Properties and Surface Integrity in Nd2Fe14B Permanent Magnets, Under Dry and Wet Grinding for Automotive Applications

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The Effect of Temperature on Magnetic Properties and Surface Integrity in Nd₂Fe₁₄B Permanent Magnets, Under Dry and Wet Grinding for Automotive Applications