多道次点式连续移动感应淬火机理研究

发布时间：2018-01-19 08:26

本文关键词： 多道次连续感应淬火数值模拟相变回火　出处：《武汉理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：三维点式连续感应淬火过程是一种新型的局部感应淬火工艺,该工艺通常采用一个单匝铜管线圈并镶嵌一个形状尺寸合适的导磁体作为热源,在工件的表面连续移动并实现加热淬火。由于线圈本身尺寸较小,和传统多匝线圈相比其运动方式更加灵活,且通常被安装在数控机床上,其热处理的深度和范围可精确控制,因而适用于各类具有复杂形状工件的表面热处理。本文基于点式连续感应淬火的特点,通过有限元软件ANSYS进行了数值模拟研究,并在自主研发的感应淬火系统中对实际工件进行了感应淬火处理,然后进行了金相和显微硬度测试,将模拟结果和实验结果进行了对比和讨论。首先,介绍了感应加热的基本原理,并推导了点式感应淬火过程中电磁场和温度场的理论公式,建立了点式感应淬火的数学模型。在数学模型的基础上,结合有限元软件ANSYS中多物理场耦合模块,建立了点式连续感应淬火的有限元模型。其次,基于有限元模型进行了三维点式连续感应淬火过程的研究,分析了各个工艺参数对点式连续感应淬火过程的影响,并结合CCT曲线和梅尼尔模型,利用ANSYS软件中的APDL语言编写程序,对淬火后组织和显微硬度进行了预测;同时基于感应淬火实验系统进行了点式连续感应淬火实验,对数值模拟结果进行了验证,说明了模拟结果的可靠性。最后,基于点式感应淬火的研究,建立了多道次连续感应淬火(二道次和三道次)的有限元模型,分别进行了二道次和三道次的连续感应淬火过程的研究,并结合回火方程,分析了多道次连续感应淬火过程中的回火效应,得到了轨迹重叠宽度对多道次连续感应淬火后工件的温度场、组织和硬度分布的影响规律,并进行了实验验证。分析过程为不规则三维曲面任意路径的移动感应淬火数值模拟提供了解决思路。
[Abstract]:Three-dimensional continuous induction quenching process is a new type of local induction quenching process, which usually uses a single-turn copper tube coil with an appropriate shape and size of magnetic conductors as the heat source. Due to the small size of the coil itself, it is more flexible than the traditional multi-turn coil, and is usually installed on the NC machine tool. The depth and range of heat treatment can be precisely controlled, so it is suitable for surface heat treatment of various kinds of workpieces with complex shape. This paper is based on the characteristics of point-type continuous induction quenching. Numerical simulation was carried out by finite element software ANSYS, and the actual workpiece was treated with induction quenching in induction quenching system, and then metallographic and microhardness tests were carried out. The simulation results and experimental results are compared and discussed. Firstly, the basic principle of induction heating is introduced, and the theoretical formulas of electromagnetic field and temperature field during point induction quenching are derived. The mathematical model of point-type induction quenching is established. Based on the mathematical model, the finite element model of point-type continuous induction quenching is established in combination with the multi-physical field coupling module in the finite element software ANSYS. Secondly, the finite element model of point-type continuous induction quenching is established. Based on the finite element model, the process of 3D point-type continuous induction quenching is studied, and the influence of various process parameters on the process of point-type continuous induction quenching is analyzed. The CCT curve and Mesnil model are combined. The microstructure and microhardness after quenching were predicted by using APDL language in ANSYS software. At the same time, the point-type continuous induction quenching experiment is carried out based on the induction quenching experimental system, and the numerical simulation results are verified to illustrate the reliability of the simulation results. Finally, based on the point-type induction quenching research. The finite element model of multi-pass continuous induction quenching (two-pass and three-pass) was established. The continuous induction quenching process of two-pass and three-pass was studied, and the tempering equation was combined. The tempering effect of multi-pass continuous induction quenching is analyzed, and the influence of track overlap width on temperature field, microstructure and hardness distribution of workpiece after multi-pass continuous induction quenching is obtained. The analysis provides a solution for the numerical simulation of moving induction quenching with arbitrary path of irregular 3D surface.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG156.3

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