圆环链感应加热中的电磁—热耦合有限元分析

发布时间：2018-09-04 10:02

【摘要】：圆环链条经过热处理可以有效地提高产品的质量和性能,而电磁感应加热作为一种清洁的加热方式,日益受到企业的欢迎。圆环链条加热设备不同的工艺参数会影响着链条温度的变化,而温度会直接影响链条内铁素体和珠光体对奥氏体的转变,因此需要研究不同工艺参数对链条加热效果的影响,通过对圆环链条加热过程进行数值模拟,可以更好地掌握设备热处理的工艺过程。针对不同规格链条热处理时需安装对应规格的传动轮而造成其效率低的问题,采用摩擦轮式的传动方式对设备结构进行了改进,有效地克服了传统轮系的弊端,并给出了设备改进后的链条处理结构示意图,简单地介绍了结构运行的原理和优点。利用有限元法建立了链条三维电磁-热耦合计算模型,通过分析链条升温过程中涡流及焦耳热在链环内的分布,研究了链环温度场的变化规律,所得结果与实验测试结果基本相吻合。研究了频率、电流密度、线圈与链条的间距等不同工艺参数对链环升温的影响,得出以下结论:(1)增加电源频率,链环会升温越迅速,链环表面温度越高,导致与中心处温差越大,加热的均匀性变差。(2)增加电流密度,虽然不能改变链环温度场的分布,但是链环表面温度同样也升高的迅速,与中心处的温差增加,加热的均匀性变差。(3)增加线圈与链条的间距,链条的升温会变慢,增加感应所需要的时间,会导致表面容易被氧化。本文对传统的圆环链条热处理设备的传动结构进行了改进,提高了链条热处理的工作效率,并对链条热处理工艺开展了电磁-热的耦合分析研究,分析了其工艺参数对链环加热的影响,对实际生产具有一定的参考意义。
[Abstract]:The heat treatment of circular chain strip can effectively improve the quality and performance of the product. As a clean heating method, electromagnetic induction heating is increasingly welcomed by enterprises. The change of chain temperature will be affected by the different process parameters of circular chain heating equipment, and the temperature will directly affect the transformation of austenite from ferrite and pearlite in chain, so it is necessary to study the influence of different process parameters on chain heating effect. The process of heat treatment of the equipment can be better grasped by numerical simulation of the heating process of the circular chain strip. In order to solve the problem of low efficiency caused by the installation of transmission wheel with corresponding specifications during heat treatment of chain with different specifications, the structure of the equipment is improved by using the transmission mode of friction wheel, which effectively overcomes the disadvantages of traditional gear train. The schematic diagram of the chain processing structure after the improvement of the equipment is given, and the principle and advantages of the structure operation are briefly introduced. Based on the finite element method, a three-dimensional electromagnetic heat coupling calculation model of chain is established. By analyzing the distribution of eddy current and joule heat in the chain during the chain heating process, the variation law of the chain temperature field is studied. The results are in good agreement with the experimental results. The effects of different technological parameters, such as frequency, current density and the distance between coil and chain, on the temperature rise of the chain are studied. The following conclusions are drawn: (1) if the frequency of the power supply is increased, the temperature of the chain will increase more quickly, and the surface temperature of the chain will be higher. The larger the temperature difference with the center, the worse the uniformity of heating. (2) increase the current density, although it can not change the distribution of the temperature field of the chain, but the surface temperature of the chain also rises rapidly, and the temperature difference increases with the temperature at the center. (3) increasing the distance between the coil and the chain will slow the chain temperature and increase the time required for induction, which will lead to the surface oxidation easily. In this paper, the transmission structure of traditional circular chain heat treatment equipment has been improved, and the working efficiency of chain heat treatment has been improved, and the electromagnetic-thermal coupling analysis of chain heat treatment technology has been carried out. The influence of the process parameters on the heating of the chain ring is analyzed, which has a certain reference significance for the actual production.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM924.01

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