Convective cooling and heat partitioning to grinding chips in high speed grinding of a nickel based superalloy

Keli, Peng; Lu, Pan; Lin, Feihong; Jin, Tan; Bao, Wencheng; Xie, Guizhi; Shang, Zhentao

doi:10.1007/s12206-021-0545-9

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…In addition, the rotation of the grinding wheel will drive the lateral translation of the heat transfer zone and contact zone in the grinding arc, which helps to achieve complete cooling of the grinding fluid on the grinding surface. The preliminary findings of related studies have confirmed [23,24] that LSG-GW can significantly reduce grinding forces and grinding temperatures, which can multiply the machining efficiency and are a structured grinding wheel type with potential engineering applications. The key to improving the heat transfer capacity in the grinding arc of LSG-GW depends on the performance of the grinding fluid transport in the heat transfer channel.…”

Section: Introductionmentioning

confidence: 72%

Study on flow field and convective heat transfer characteristics in grinding zone of large spiral angle flow disturbance grooved wheel

Mao,

Liu,

Jiang

et al. 2023

Int J Adv Manuf Technol

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In view of the high specific removal energy, high heat generation rate, low heat transfer efficiency, easy to produce local high temperature and grinding burns, new macrostructured grinding wheel forms were proposed, namely, Large Spiral-angle Grooved Grinding Wheels (LSG-GW, β>85°) and Large Spiral-angle flow Disturbance Grooved Wheels (LSDG-GW). Considering the influence of wheel parameters, groove parameters and process parameters, an analytical model of the airflow field in the wedge area and contact area of LSG-GW was established. Analytical model of gas-liquid two-phase flow field and theoretical model of convective heat transfer coefficient distribution in heat transfer channels were established.The results showed that increasing the groove width, groove depth and the spiral angle can reduce the pressure of the flow field in the air barrier layer and make it easier for the grinding fluid to enter the grinding contact area. The LSDG-GW further reduces the grinding fluid back flow and side flow intensity, proving that the flow disturbance structure can bring in more grinding fluid into the grinding contact area. A theoretical model for the distribution of convective heat transfer coefficient in the grinding contact area was derived, and the analysis results proved that the flow disturbance structure can significantly improve the convective heat transfer coefficient in the grinding contact area. The LSDG-GW, as a new macro surface structured grinding wheel, has a very promising application in the high efficiency and high precision grinding process of difficult-to-machine alloy materials.

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Section: Introductionmentioning

confidence: 72%

Study on flow field and convective heat transfer characteristics in grinding zone of large spiral angle flow disturbance grooved wheel

Mao,

Liu,

Jiang

et al. 2023

Int J Adv Manuf Technol

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show abstract

“…Second, since most grinding processes involve the use of a cooling medium, the influence of the cooling medium on the temperature needs to be considered. The convective heat transfer coefficient (h f ), which encompasses all factors related to convective heat transfer, serves as the parameter that directly characterizes the heat transfer capacity of the cooling medium [8,[144][145][146][147]. The heat source distribution model, grinding heat distribution coefficient model, and convective heat transfer coefficient model together form the grinding thermal model.…”

Section: T(x Y Z T)=σmentioning

confidence: 99%

Temperature field model in surface grinding: a comparative assessment

Yang,

Kong,

et al. 2023

Int. J. Extrem. Manuf.

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Grinding is a crucial process in machining workpieces because it plays a vital role in achieving the desired precision and surface quality. However, a significant technical challenge in grinding is the potential increase in temperature due to high specific energy, which can lead to surface thermal damage. Therefore, ensuring control over the surface integrity of workpieces during grinding becomes a critical concern. This necessitates the development of temperature field models that consider various parameters, such as workpiece materials, grinding wheels, grinding parameters, cooling methods, and media, to guide industrial production. This study thoroughly analyzes and summarizes grinding temperature field models. First, the theory of the grinding temperature field is investigated, classifying it into traditional models based on a continuous belt heat source and those based on a discrete heat source, depending on whether the heat source is uniform and continuous. Through this examination, a more accurate grinding temperature model that closely aligns with practical grinding conditions is derived. Subsequently, various grinding thermal models are summarized, including models for the heat source distribution, energy distribution proportional coefficient, and convective heat transfer coefficient. Through comprehensive research, the most widely recognized, utilized, and accurate model for each category is identified. The application of these grinding thermal models is reviewed, shedding light on the governing laws that dictate the influence of the heat source distribution, heat distribution, and convective heat transfer in the grinding arc zone on the grinding temperature field. Finally, considering the current issues in the field of grinding temperature, potential future research directions are proposed. The aim of this study is to provide theoretical guidance and technical support for predicting workpiece temperature and improving surface integrity.

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“…Manufacturing inaccuracy is influenced not only by process energy intensity and machining power but also the local concentration of energy [ 7 , 8 ], the shape and location of the machining zone [ 9 , 10 ]. The location and shape of the contact zone of the grinding wheel surface with the workpiece surface can be determined directly by modeling the grinding process [ 11 , 12 ], evaluating energy [ 13 ] and grinding forces [ 14 , 15 ], analysing temperature fields [ 16 ] and microcutting mechanisms [ 17 ]. Intermediate assessments of the surface condition of the tool are also useful [ 4 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…The variability of the cavity is the result of many factors. Among the most important are: variability of the nominal cavity, which depends on the kinematic characteristics of the method, irregularities of the workpiece surface in the machining zone, local susceptibility of the workpiece material and abrasive grains [ 26 , 32 ], vibration of the tool and abrasive grains, significant local variation (in the grain interaction zone) of temperature rise [ 7 , 33 ], especially when machining materials with low thermal conductivity [ 2 , 4 ] at very high speeds, variation in the properties of the machined material in micro-volumes compared with the volumes of the cut layers [ 1 , 7 ], variability of grain load [ 12 ], phenomena in high speed grinding [ 17 ], local forms of grain wear [ 29 , 33 ], macro- and microcontinuity of the chip and pile-up formation process [ 34 , 35 , 36 ]. …”

Section: Introductionmentioning

confidence: 99%

“…significant local variation (in the grain interaction zone) of temperature rise [ 7 , 33 ], especially when machining materials with low thermal conductivity [ 2 , 4 ] at very high speeds, variation in the properties of the machined material in micro-volumes compared with the volumes of the cut layers [ 1 , 7 ], variability of grain load [ 12 ], phenomena in high speed grinding [ 17 ], local forms of grain wear [ 29 , 33 ],…”

Section: Introductionmentioning

confidence: 99%

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Metrological Aspects of Assessing Surface Topography and Machining Accuracy in Diagnostics of Grinding Processes

et al. 2023

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The paper presents probabilistic aspects of diagnostics of grinding processes with consideration of metrological aspects of evaluation of topography of machined surfaces and selected problems of assessment of machining accuracy. The processes of creating the geometric structure of the ground surface are described. It was pointed out that the distribution of features important for process diagnostics depends on the mechanism of cumulative effects of random disturbances. Usually, there is a multiplicative mechanism or an additive mechanism of the component vectors of relative displacements of the tool and workpiece. The paper describes a method for determining the classification ability of specific parameters used to evaluate stereometric features of ground surfaces. It is shown that the ability to differentiate the geometric structure of a certain set of surfaces using a selected parameter depends on the geometric mean of the differences in normalized and sorted, consecutive values of this parameter. A methodology is presented for evaluating the ability of various parameters to distinguish different geometric structures of surfaces. Further, on the basis of analyses of a number of grinding processes, a methodology was formulated for proceeding leading to a comprehensive evaluation of machining accuracy and forecasting its results. It was taken into account that in forecasting the accuracy of grinding, it is necessary to determine the deviations, arising under the conditions of multiplicative interaction of the effects of various causes of inaccuracy. Examples are given of processes in which, due to the deformation of the technological system, dependent on the position of the zone and machining force, varying temperature fields and tool wear, the distributions of dimensional deviations are not the realization of stationary processes. It was emphasized that on the basis of the characteristics of the dispersion of the deviation value in the sum set of elements, it is not possible to infer its causes. Only the determination of the “instantaneous” values of the deviation dispersion parameters allows a more complete diagnosis of the process.

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Convective cooling and heat partitioning to grinding chips in high speed grinding of a nickel based superalloy

Cited by 10 publications

References 25 publications

Study on flow field and convective heat transfer characteristics in grinding zone of large spiral angle flow disturbance grooved wheel

Study on flow field and convective heat transfer characteristics in grinding zone of large spiral angle flow disturbance grooved wheel

Temperature field model in surface grinding: a comparative assessment

Metrological Aspects of Assessing Surface Topography and Machining Accuracy in Diagnostics of Grinding Processes

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