347-paper-B5-数值模拟技术在大模块预硬化热处理中的应用.doc

编号：B5（中文全文）P20模块预硬化热处理过程中的淬火加热、淬火冷却、回火过程中的温度场进行模拟，进而预测热处理过程中的组织变化。根据数值模拟结果结合实际生产验证数据对预硬化生产工艺参数进行了调整和优化，提高了模块预硬化质量，降低了模块淬火开裂风险，同时降低了热处理能耗。 关键词： 模具钢 热处理 数值模拟 有限元 Application of Numerical Simulation Technique in Prehardening Heat Treatment of Big Die Blocks Wang Qingliang1,3 Xu Wei1 Pan Jiansheng2 Hong Dehua2 1 Baoshan Iron Steel Co., Ltd. Special Steel Branch Manufacturing Management Department 200940 2 Shanghai Jiaotong University School of Materials Science Engineering 200030 3 Northeast University School of Materials Science Engineering 110000 Abstract: Heat treatment process control is one of the key techniques which decide the quality of the prehardened die steel for plastics. Conventional process control methods often rely on experience and subjectivity. Heat treatment process is a complicated physical process in which temperature field, structure and stress field are interconnected each other. It is impossible to carry out on-line inspection and control during the heat treatment process. In this research, finite element numerical simulation technique has been adopted to simulate the temperature fields of the prehardening heat treatment process of P20 die blocks at the stages of hardening heating, cooling and tempering, and then predict the change of structures during the heat treatment. Adjustment and optimization of prehardening heat treatment process parameters have been made based on numerical simulation results and practical data obtained in production, which improved the quality of prehardened die blocks, reduced the risk of quenching cracking and energy consumption of heat treatment. Key Words: die steel, heat treatment, numerical simulation, finite element 前言 热处理过程的控制是决定预硬化塑料模具钢质量的关键技术之一，一般根据传统技术手册、资料中的经验方法来设计制定工艺，这种方法往往带有很大的经验性和主观性。大型塑料模具钢模块的预硬化过程一般包括加热、淬火、回火等工序，预硬化工艺参数的正确合理地制定，不仅关系到模具钢组织性能的控制，降低模具变形、开裂的倾向，还有助于降低热处理能耗，降低生产成本。 热处理过程并不是一个简单的温度变化过程，而是一个温度场、组织场、应力场相互耦合的复杂物理过程1。而这些物理场的变化，实际生产中是无法进行在线检测和控制的。当前，唯有借助于物理模拟和数值模拟技术的综合应用，才能实现对这些物理量的虚拟