【作者】 张燕；

【导师】 辛志杰； 高志红；

【作者基本信息】 中北大学 ， 工程硕士（专业学位）， 2020， 硕士

【摘要】 航空航天领域作为一个国家科技水平的重要标杆,其工业地位独占鳌头。在为某航天院修复设计损坏的热压模具的过程中,接触并了解到热压模具工艺简单、稳定高效的优势,在航空用零件上的应用力度甚广。但现代社会模具工业的发展进程中,热压模具的脚步过于缓慢,停留在十几年前的技术水平上,甚少有人研究。因此,本文针对此设计的热压模具的结构进行优化,为航空复合材料塑件的精度与模具使用寿命的延长,提供研究技术理论。本文对此热压模具的设计中,虽然结构相对简单,但其成型塑件存在多个复杂曲面,对于精度有极高要求,然而已磨损的模具精确参数严重丢失。因此利用正逆向融合理念,通过三维软件的正反向技术,共同建立数值精确的模具模型。增加了设计层面的灵活度。此外,加工工艺是影响热压模具结构的最大因素。本文采用有限元理论分析,通过ABAQUS仿真软件,建立热-应力耦合模型,讨论了成型阶段金属材料内部产生的残余应力,对模具结构造成的影响。通过模拟模具热应力与回弹现象的分析,得出接触面最多的部分承受的应力值最大,从而求得模具机构需要优化的部分,讨论并确定了合适的优化设计方案。针对本文热压模具的结构优化,提升了热压成型模具的加工生命周期,不仅使热压模具结构合理性的研究迈进一步,也为今后很可能存在的再设计提供了有利理论参考意义。更多还原

【Abstract】 As an important benchmark of a country’s scientific and technological level,the aerospace industry has a leading position in the industry.In the process of repairing and designing damaged hot press molds for a certain aerospace institute,I contacted and learned about the advantages of simple,stable and efficient hot press mold processes,which have been widely used in aviation parts.However,in the development process of the modern society mold industry,the pace of hot pressing molds is too slow,staying at the technical level of more than ten years ago,few people have studied.Therefore,this paper optimizes the structure of the hot-pressing mold designed to provide research technical theory for the accuracy of the aerospace composite plastic parts and the extension of the service life of the mold.In this paper,the design of this hot press mold,although the structure is relatively simple,but its molded plastic parts have multiple complex curved surfaces,which have extremely high requirements for accuracy,but the precise parameters of the worn mold are seriously lost.Therefore,using the forward and backward fusion concept,through the three-dimensional software forward and backward technology,jointly establish a numerically accurate mold model.Increased flexibility at the design level.In addition,the processing technology is the biggest factor that affects the structure of the hot press mold.In this paper,the finite element theory analysis is used to establish the thermal-stress coupling model through the ABAQUS simulation software,and the impact of the residual stress generated in the metal material during the molding stage on the mold structure is discussed.By analysing the thermal stress and springback of the mold,it is concluded that the part with the most contact surface bears the largest stress value,so as to find the part that needs to be optimized in the mold mechanism,and discuss and determine the appropriate optimal design plan.In view of the optimization of the structure of the hot-pressing mold in this paper,the processing life cycle of the hot-pressing mold is improved,which not only makes the research of the rationality of the hot-pressing mold structure a step further,but also provides a favorable theoretical reference for the possible redesign in the future.更多还原