共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
3.
4.
5.
铝合金半固态感应加热的计算机模拟 总被引:11,自引:0,他引:11
根据实际条件确定了感应加热线圈的计算结构和材料的有关参数, 应用改进的商业ANSYS软件, 采用一维轴对称模型对铝合金中频感应加热温度及其分布进行了模拟. 结果表明, 在大功率和小功率的加热条件下, 模拟结果与实测结果均相当吻合. 相似文献
6.
7.
8.
9.
10.
11.
厚壁筒形工件连续感应热处理有限元模拟 总被引:23,自引:0,他引:23
对麦克斯威方程组和导热微分方程进行分解化简 ,得到计算无限长轴对称工件的电磁场、感生涡流和温度场分布的基本方程。基于这些方程在ANSYS软件上实现了对厚壁筒形工件连续感应热处理的计算机模拟计算。计算了加热、淬火和回火等热处理过程中 ,工件温度变化和加热功率变化 ,预测工件淬火冷却时的组织转变 ,计算中考虑了工件材料物理参数随温度变化对加热过程的影响。通过模拟计算 ,实现了对连续感应热处理工艺的优化分析 ,而且找到了一种对连续感应热处理设备结构设计和工艺参数配置优化的方法 相似文献
12.
In local post weld heat treatment, the temperature difference is the criterion of the process. The temperature field in the main stream pipe under heal post weld heat treatment is simulated by finite element method. A close-loop control program-is designed to simulate the temperature field of two different pipes. Both the skin effect of induction heating and electro-thermal coupled effect are considered in the heating model. The local heat treatment temperature difference at the inner and outer side of the pipe is analyzed and the different convection conditions are also considered. The simulation results show that in appropriate induction heating process, the temperature difference in the pipe can be controlled within 30 ℃. 相似文献
13.
Valery Rudnev 《Journal of Materials Engineering and Performance》2013,22(7):1899-1906
In the last decade, when discussing subjects related to a computer modeling of induction heating and heat treating, the word “usefulness” has been replaced by the word “necessity.” Modern computer simulation is capable of effectively simulating electromagnetic and thermal phenomena for many processes, including those that involve electromagnetic induction. This article discusses the state-of-the-art computer simulation of induction heating and heat treating providing answers to following questions: Why finite element analysis is not always the best tool for computer modeling of some induction heating applications? What are the limitations of generalized all-purpose commercial programs? What are the crucial tips that executives must know regarding computer modeling of induction heating? Several case studies will be reviewed in this article as well. 相似文献
14.
《International Heat Treatment & Surface Engineering》2013,7(2):65-68
AbstractInduction heating reduces energy consumption, contributes to the protection of the environment, and improves productivity. This paper describes the development and application of computer simulation of induction heat treatment considered with coupling of temperature field and magnetic field. In this paper, the developed simulation code COSMAP is introduced as a CAE software system for considering the design of induction heat treatment process. It covers all aspects of heat treatment simulation, from magnetic and electrical to thermal states, phase transformation, residual stresses including as well all metallurgical phenomena. 相似文献
15.
Finite-element simulation of induction heat treatment 总被引:2,自引:0,他引:2
K. F. Wang S. Chandrasekar Henry T. Y. Yang 《Journal of Materials Engineering and Performance》1992,1(1):97-112
An efficient finite-element procedure has been developed for the analysis of induction heat treatment problems involving nonisothermal
phase changes. The finite-element procedure first simulates the magnetic field developed when currents flow through an induction
coil by solving Maxwell’s electromagnetic field equations; at the following step, it calculates the temperature distribution
in the workpiece due to eddy currents induced by the magnetic field. The final stage of the simulation involves the determination
of the distributions of residual stress, hardness, and microstructure in the workpiece. The finite-element analysis includes
temperature-dependent material properties, changes in permeability of the workpiece at the Curie temperature, a mixed hardening
rule to describe the material constitutive model, and the incorporation of time-temperature-transformation (TTT) diagram. The procedure was applied to the simulation of the induction hardening of 1080 steel bar. Firstly, the magnetic
field and temperatures developed in the workpiece during (a) the induction heating of an infinitely long 1080 steel cylinder
by a single encircling coil and (b) the induction heating of a semi-infinite half-space by a single coil suspended above it
were calculated using the finite-element procedures. These were validated by comparing them with analytical solutions derived
for these configurations using a Green’s function method. Finally, to demonstrate the predictive capability and practical
applicability of the current finite-element procedure, two examples pertaining to the induction heat treatment of an infinite
1080 steel bar of square cross section and a notched finite 1080 steel cylinder of circular cross section were analyzed to
predict the magnetic field, temperature, and residual stress distributions. The current finite-element procedure could be
used as a powerful design tool for linking induction heat treating parameters with the mechanical property attributes of the
heat treated component. 相似文献
16.
连续运动薄板横向磁通感应加热耦合场分析新方法 总被引:5,自引:1,他引:4
通过沿薄板运动反方向以单元格的形式平移薄板中的热源来取代薄板的连续运动,使得温度场的每次计算可以采用相同的热源分布,无需重新计算涡流场,大大减少了横向磁通感应加热耦合场数值仿真的时间。利用有限元数值计算结果作为神经网络的训练样本,分别建立了横向磁通感应加热装置出口处平均温度及其平均相对误差的预测模型。检验样本的结果表明所训练的神经网络具有很高的准确性。利用神经网络分析了频率和电流对平均温度及其平均相对误差的影响,并应用模拟退火法对频率和电流进行了优化以获得给定温度下的最小平均相对误差。 相似文献
17.
18.
热处理数值模拟与远程服务 总被引:9,自引:2,他引:7
扼要归纳了上海交通大学在热处理计算机模拟研究中的一些体会。数值模拟技术在渗碳(或渗氮)中的应用,已能处理将工艺参数(温度、气体成分、传递系数、扩散系数等)作为时间函数的复杂的非线性问题,更加接近生产实际情况,同时考虑了形状因素的影响。以其为核心开发气体渗碳CAD软件,并与实时控制直接结合形成的智能化渗碳技术,已取得良好实用效果;淬冷过程的数值模拟应用瞬态温度场-相变-应力场相互耦合的非线性三维有限元模型,实现了复杂形状工件、复杂淬冷操作的模拟,并完成了生产试验验证,初步应用于生产。在总结过去的工作和结合国内外相关工作的基础上,本文指出,目前热处理模拟技术正逐步进入实用化阶段,并使热处理远程服务成为可能。热处理远程服务是借助因特网将服务中心与用户连接起来的不受地域限制的技术服务方式,可以进行即时的自助的技术服务,它将改变热处理传统技术服务方式,优化热处理技术资源配置,改变热处理技术人员的工作方法,使其能更多地在服务中心提供的虚拟环境中进行创造性思维和工作。 相似文献
19.
建立了S45C钢台阶轴连续感应淬火过程的分区模拟模型,加载相应的物性和工艺参数,采用感应加热结束时刻轴径向温度分布、Maynier模型、Carsi修正模型和钢CCT曲线拟合预测其淬硬层深度分布,通过联动分析各方法的模拟结果优化了连续感应淬火工艺参数。结果表明,感应淬硬层中关键点b的100%、50%和0%马氏体的模拟深度分别为1.31、1.49和2.97 mm,误差分别为-12.67%、-13.87%和-1.00%,关键点e分别为1.44、2.02、2.54 mm,误差分别为-4.00%、-3.38%和-18.06%,与试验结果较吻合。通过感应淬火工艺参数改变和物理模型调整等探讨了零件各点处的轴径淬硬层变化,给出拟优化的感应淬火工艺参数。初步探讨了换热系数h变化对感应淬硬层的影响。 相似文献