Numerical study of titanium melting by high frequency inductive heating

Lu, Liangliang; Zhang, Shaoming; Xu, Jun; He, Huijun; Zhao, Xiaohui

doi:10.1016/j.ijheatmasstransfer.2017.01.062

Cited by 55 publications

(10 citation statements)

References 17 publications

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“…The reason why moving induction coil when brazing is that the magnetic induction line generated by the induction coil is not evenly distributed, but presents the form of dense in the middle, where generates more heat, and sparse at both ends, where generates less heat. Therefore, the heating of the grinding wheel is uneven, which leads to a large temperature gradient during brazing [29,30]. In order to heat the abrasive tool evenly, it is necessary to control the induction coil to move while heating in order to improve the brazing quality.…”

Section: Operation Methods Of the Uvaib Devicementioning

confidence: 99%

Structure design and experimental study on ultrasonic vibration–assisted induction brazing cubic boron nitride abrasive tools

Cai

Zhao

et al. 2022

Int J Adv Manuf Technol

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Brazed abrasive tool has been widely used in high-precision machining of di cult-to-cut materials to improve the machining e ciency and quality. However, the severe wear and associated short service life during machining processes have to be faced for conventional induction brazed (CIB) abrasive tools owing to its weak bonding strength between abrasive grains and metal-bonded materials. In this case, a novel ultrasonic vibration-assisted induction brazing (UVAIB) device was developed to improve the abrasive bonding strength. Here, the frequency equation of the UVAIB device was derived using recursive methods, and then the geometric designation parameters were optimized with the nite element simulating method. In addition, the performance of UVAIB device was tested in terms of the impedance and amplitude. Subsequently, the comparative experiment trials were performed with the brazed abrasive tools under the CIB and UVAIB method. Results show that the ultrasonic energy loss of UVAIB device could be reduced, and then the ampli cation value and vibration uniformity could reach 8 and 92%, respectively. In addition, for CIB, there are a large number of pores and macro-cracks on the joints. However, the internal pores inside the metallic matrix of UVAIB were reduced, and only fewer and smaller micro-cracks could be found. Furthermore, the intergranular fracture of abrasive grains could be observed for CIB abrasive tools owing to the weak bonding interface caused by the existence of numerous micropores, whereas the grain transgranular fracture appeared once adopting the ultrasonic vibrating method.

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Section: Operation Methods Of the Uvaib Devicementioning

confidence: 99%

Structure design and experimental study on ultrasonic vibration–assisted induction brazing cubic boron nitride abrasive tools

Cai

Zhao

et al. 2022

Int J Adv Manuf Technol

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“…In most cases, it is impossible to deduce the electromagnetic and temperature distribution analytically. Therefore, finite element method (FEM)-based numerical simulation has become a popular mean used by many researchers to analyze the induction heating process in industrial applications, including metal forming, 6–13 melting 14 and molding, 15 crystal growing, 16 wafer packaging, 17,18 and welding process. 19,20 Cho 6 established a cost-effective coupled electromagnetic-thermal model to numerically analyze the solutions of both stationary and moving workpiece under low frequency induction heating system, which could predict more precise results of temperature distribution in the variable magnetic field than the previous model.…”

Section: Introductionmentioning

confidence: 99%

“…When it comes to non-crucible induction melting technique, Lu et al. 15 numerically analyzed the magnetic, temperature and fluid fields considering the endothermic latent heat of titanium, demonstrated as a computational-efficient approach to predicting the dynamic change process of high frequency EMIH supported by experimental results. In terms of crystal growth system, Heidari et al.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of electromagnetic induction heating process for bolted flange joints

Liu

Xie

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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As a promising metalwork processing technology, electromagnetic induction heating (EMIH) method has been applied in dealing with bolted flange joints in turbomachinery. In this study, a 3-D finite element model of electromagnetic induction heating system for the bolted flange joint is established, and the specific governing equations are derived based on Maxwell’s principle. The alternately-coupled magneto-thermal analysis is carried out considering temperature-dependent material properties to obtain the temperature distribution, followed with the uncoupled thermal-mechanical analysis to acquire the axial stress and deformation in EMIH process. The magnetic induction intensity mainly concentrates at the inner wall region, attenuates seriously along the radial direction, and reduces to almost zero at the outer wall. Due to the skin effect, the heat transfers radially and axially outward, indicating a diamondlike-shaped development from the center to the surrounding region. The axial stress with and without initial pretension are also discussed respectively. Then the corresponding experiments are introduced and carried out to validate the reliability of numerical simulation results. By comparing the results of the center point of inner surface and outer surface, the numerical simulation is proved reliable with a 5∼10% reasonable deviation. Further, the induction heating process has been improved through the optimization method based on pattern search algorithm. By adopting the stepped input current density optimized in the study, the optimal thermal stress tends to be constant and the final heating time reduces by 20.5% in the safe range of stress.

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“…Some studies revealed that the temperature was increased obviously with the enhancement of the current and frequency but the temperature difference of hot-plate was enlarged remarkably. [12][13][14] The effect of the magnetic materials on the temperature fields distribution was studied by Gao et al 15 The uniformity of temperature distribution could be improved by enhancing the magnetizer width but with adverse effect of the magnetizer length. In addition, the uniform temperature distribution can be achieved by optimizing the arrangement of the magnetizer.…”

Section: Introductionmentioning

confidence: 99%

A novel method improving the temperature uniformity of hot-plate under induction heating

Wang

Chen

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the paper, a novel method to improve the uniformity of the temperature distribution on the surface of the hot-plate is presented. Firstly, the effect of magnetic flux density under coupling of the electromagnetic and heat transfer on target surface temperature is studied numerically by using the commercial simulation software COMSOL Multiphysics. To evaluate the uniformity of the temperature distribution on the target surface, the temperature nonuniformity index on the target surface was firstly employed in terms of a specific designed electric coil. Secondly, the principal components analysis combined with the orthogonal test method is employed to analyze the shape parameters and obtain optimized temperature distribution at the target surface of the hot-plate. The simulated results show that the uniformity of temperature can be greatly improved by appropriately adjusting distribution of magnetic flux and the uniform temperature distribution can be achieved on a heating surface of 130 mm in length, 130 mm in width, and 30 mm in height. Finally, the optimizations of target surface temperature on hot-plate with different target temperatures were studied as well.

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Numerical study of titanium melting by high frequency inductive heating

Cited by 55 publications

References 17 publications

Structure design and experimental study on ultrasonic vibration–assisted induction brazing cubic boron nitride abrasive tools

Structure design and experimental study on ultrasonic vibration–assisted induction brazing cubic boron nitride abrasive tools

Numerical and experimental study of electromagnetic induction heating process for bolted flange joints

A novel method improving the temperature uniformity of hot-plate under induction heating

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