| Transverse flux induction heating has the advantages of fast heating speed,high heating efficiency,environmental friendly,and easy automation control,which can not only save energy,improve product quality and production efficiency,but also provide the possibility for the development of new materials with excellent organizational performance.However,the transverse flux induction heating has an edge effect,that is,the temperature difference between the edge of the strip and the middle area is large,which makes the temperature distribution of the strip width uneven.Although researchers at home and abroad have proposed a variety of methods to improve the edge effect,they still cannot meet the requirements of industrial applications,and the problem of uneven temperature distribution of the strip width has not been well solved.How to solve the problem of uneven distribution of transverse flux induction heating temperature has been a hot topic at home and abroad,and it is also one of the key technical problems to realize the industrial application of transverse flux induction heating technology.Aiming at the problem of uneven temperature distribution in the width of the strip during the transverse flux induction heating process,based on the systematic review of relevant literature,the transverse flux induction heating simulation model is established based on the induction heating theory and the transverse flux induction heating design experience formula centered on Maxwell's equations;the influence of the structure and parameters of magnetic conductor and coil on the uniformity of temperature distribution was studied by numerical simulation,and the transverse flux induction heater was optimized and adjusted.The main research contents and results are as follows:(1)Establishment of simulation model of transverse flux induction heating.Based on the induction heating theory centered on Maxwell's equations,key functions such as the magnetic flux distribution,eddy current distribution and power density of transverse flux induction heating are established;according to the heating requirements of the metal strip and empirical formulas,important parameters such as slot width,slot depth,pole pitch and coil diameter are calculated;and the transverse flux induction heating simulation model established by the finite element numerical simulation software COMSOL.(2)The influence of magnet structure and parameters on the temperature uniformity of the strip.In view of the phenomenon that a low temperature region is formed between the edge and the center of the strip due to the weakening of eddy current density,the influence of four different magnet structures and parameters on the uniformity of the temperature distribution of the strip is studied,including the yoke width between adjacent coils,the yoke width in a single coil,the side yoke width and the local yoke height.The results show that after adjusting the structure and parameters of the magnetizer,the temperature in the low temperature zone increases due to the increase of eddy current density,which improves the temperature distribution in the low temperature zone.(3)The influence of coil structure and parameters on the temperature uniformity of the strip.In view of the phenomenon that the temperature of the edge of the strip is too high than that of the middle region,the effects of three types of coil structures and parameters,the shape of the coil,the distance between the coil end and the edge of the strip and the effective length of the coil,on the uniformity of the strip temperature distribution are studied.Research has found that adjusting the coil shape,the distance between the coil end and the strip edge and the effective length of the coil have a significant effect on improving the overheating phenomenon of the strip edge,and make the width of the strip more uniform in temperature distribution.(4)Optimized adjustment of transverse flux induction heater.According to the research results of the influence of the structure and parameters of the magnet and coil on the temperature distribution uniformity,the transverse flux induction heating model is optimized and adjusted.The results show that the maximum relative unevenness of the strip width to the temperature after adjustment is reduced from 39.73%before adjustment to 2.75%,and the average relative unevenness of temperature is reduced from 12.61%before adjustment to 1.20%.The uniformity of temperature distribution has been significantly improved. |
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