热处理数值模拟与远程服务

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。

Numerical Simulation of Heat Treatment and its Remote Technical Service

This paper summarizes the research of computer simulation for heat treatment processes in Shanghai Jiaotong University. The application of numerical simulation in carburizing has realized the simulation of technology parameters as a function of time, such as, temperature, atmosphere compositions, carbon transfer coefficient, and diffusion coefficient, where the effect factors are considered. The parameters will be more approximate to the practical situations. On the basis of the above stated simulation, the CAD software of gas carburizing was developed, and an intelligent carburizing technology was formed combining the on line computer controlling. The good results were achieved. In the computer simulation of quenching process, the 3D no linear FEM model of coupling the temperature, phase transformation and stress was used to simulate the temperature fields with complicated shapes and technology processes. The corresponding experiments in production were carried out. The experimental results are in agreement with the simulation results. The simulation method has been applied to production. By summarizing our past work and combining the international related work, this paper indicated that currently the simulation of heat treatment are proceeding to the stage of practical application, thus, the remote technical service for heat treatment can be realized. The remote technical service for heat treatments is the way of connecting the user and service center via Internet, performing the on line and self assistant technical service without location limit. It will change the conventional technical service for heat treatments, optimize the source distribution of heat treatment technologies, and change the working way of heat treating technicians. Therefore they can conduct the creative thinking and working by on line connecting the remote technical service center for heat treatment.