热冲压模具随形管道设计优化研究

发布时间：2018-06-12 13:30

本文选题：热冲压模具 + 随形冷却水道　；参考：《大连理工大学》2016年硕士论文

【摘要】：随着汽车轻量化技术发展的日趋完善,高强度钢板热冲压技术在实现汽车轻量化的同时,提高了汽车的安全性,对能源的节约与环境的保护也都发挥了应有的作用。高强度钢板在热冲压生产过程中,热冲压模具承担着对其成形和保压淬火的工作,在保压淬火过程中,板料降温速率决定了其成形后零部件的质量和力学性能,因此热冲压模具的冷却效率是决定热冲压生产的零部件质量能否达到要求的关键因素。热冲压模具内部设计的冷却水道是影响模具冷却效率的最主要因素,设计合理、加工工艺先进的冷却系统,能够保证在工业生产过程中,模具可以完成对高温板料进行连续快节拍淬火的任务,同时高效的冷却系统可以有效降低模具的热疲劳,提高模具表面的温度均匀性。随着快速成型技术的发展,随形冷却水道的加工技术得到了进一步的完善,且与传统热冲压模具直型冷却水道相比,针对模具表面特征设计的随形冷却水道具有冷却效率高、模具表面温度均匀性好等特点。本文采用数值模拟仿真技术对随形冷却水道进行优化设计,在传统的冷却水道设计的基础上提高了设计的效率和质量。为了更准确的模拟实际工况,对模拟仿真过程中涉及到界面换热系数、对流换热系数等边界条件进行分析与求解。同时简化部分边界条件以提高仿真模拟的效率,并对简化内容进行验证分析。通过整合试验设计与全局优化,利用三维建模软件、有限元分析软件与优化集成软件,提出系统的随形冷却水道设计优化方案,建立高效稳定的设计优化流程,提高最终设计产品的质量。通过仿真与实验相结合的方式对整个设计流程的成果进行验证,分析结果并提出改进方案,最后得到优化后的模具总体冷却效果明显提升,模具表面温度均匀性显著改善的结论。此套流程在解决实际工业生产中设计环节的问题时有一定的参考与借鉴价值。
[Abstract]:With the improvement of the development of automobile lightweight technology, the high strength steel sheet hot stamping technology improves the safety of automobile while realizing automobile lightening. It also plays an important role in the conservation of energy and the protection of the environment. In the process of hot stamping, the hot stamping die bears the forming and pressing quenching of the hot stamping die. In the process of fire protection, the cooling rate determines the quality and mechanical properties of the parts after forming, so the cooling efficiency of the hot stamping die is the key factor to determine the quality of the parts of the hot stamping die. The cooling efficiency of the die is the most important factor affecting the cooling efficiency of the hot stamping die. The main factors, reasonable design and advanced processing technology, can ensure that in the process of industrial production, the mold can finish the task of continuous fast speed quench for high temperature sheet material. At the same time, the high efficiency cooling system can effectively reduce the thermal fatigue of the die and improve the temperature uniformity of the mold surface. The processing technology of the shaped cooling channel has been further improved. Compared with the traditional hot stamping die direct cooling channel, the cooling water channel designed for the surface characteristics of the die has the characteristics of high cooling efficiency and good uniformity of the surface temperature of the die surface. This paper uses the numerical simulation technology to optimize the shape cooling channel. The design has improved the efficiency and quality of the design on the basis of the traditional cooling channel design. In order to simulate the actual working conditions more accurately, the boundary conditions, such as the interface heat transfer coefficient and the convection heat transfer coefficient, are analyzed and solved in the simulation process, and the partial boundary conditions are simplified to improve the efficiency of simulation and to simplify the simulation. Through the integration of experimental design and global optimization, using three-dimensional modeling software, finite element analysis software and optimization integration software, the design optimization scheme of the system is proposed, the efficient and stable design optimization process is established to improve the quality of the final design products. The result of the whole design process is verified, the results are analyzed and the improvement scheme is put forward. Finally, the overall cooling effect of the mold is improved obviously and the temperature uniformity of the die surface is improved remarkably. This set of flow has some reference and reference value when solving the problem of the design link in the actual industrial production.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U466

【参考文献】