基于立体光固化3D打印的一体化石膏铸型的高温力学性能研究  

Study on High Temperature Mechanical Properties of Integrated Gypsum Molds Based on Vat Photopolymerization

作　　者：王忠睿 苗恺[1,2] 朱伟军 李涤尘[1] WANG Zhongrui;MIAO Kai;ZHU Weijun;LI Dichen(State Key Laboratory for Manufacturing Systems Engineering,Xi'an Jiao tong University,Xi'an 710049;State Key Laboratory of Light Alloy Casting Technology for High-end Equipment,Shenyang Research Institute of Foundry,Shenyang 110022;School of Mechanical Engineering&Autoination,Beihang University,Beijing 100191)

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,西安710049 [2]沈阳铸造研究所高端装备轻合金铸造技术国家重点实验室,沈阳110022 [3]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《机械工程学报》2019年第23期182-188,共7页Journal of Mechanical Engineering

基　　金：国家科技重大专项(2017-VII-0008-0101);国家重点实验室开放基金(LACT-003);国家自然科学基金(51505457);陕西省重点研发计划(2018ZDXM-GY-059)资助项目

摘　　要：机匣是航空发动机的重要承力构件,向大型化、整体化、匣体/管道一体化方向发展,对现有加工技术提出挑战。基于立体光固化3D打印的一体化石膏铸型制备方法,为机匣类轻质合金零件的精密铸造提供新思路。铸造用光固化树脂材料的烧失温度高、发气量大,这对石膏型材料的高温力学性能提出更高要求。因此,在确定石膏型力学性能的关键温度基础上,研究石膏型力学性能随温度的变化规律,探讨膏水比、填料比等对石膏型力学性能的影响机理,发展同化学组分晶须增强石膏型的方法。在此基础上,将石膏铸型500℃高温弯曲强度提高至2 MPa以上,并实现薄壁机匣样品(含有内径3 mm管路)的铸造。The casing is an important bearing component of the aero-engine,and it is developing towards large-scale,integrated,and casing/pipe integration,posing challenges to existing processing technologies.Based on Vat photopolymerization,a popular process of 3D printing,the preparation method of integrated gypsum mold is proposed,providing a new method for rapid precision casting of complex lightweight alloy parts.However,the photocurable resin for casting has a high temperature for ignition lost and a large amount of gas generation,which puts higher requirements on the high temperature mechanical properties of the gypsum mold.Therefore,based on the determination of the critical temperatures for gypsum mechanical properties,the change laws of mechanical properties with temperatures are studied,and the influence mechanism of paste/water ratio and paste/filler ratio on the mechanical properties is discussed.Method to enhance gypsum by whiskers with same chemical component is developed.An integrated gypsum mold is made with bending strength of over 2 MPa in the high temperature of 500℃,from which a thin-walled aluminum alloy casing sample is cast with pipes with inner diameters of 3 mm.

关 键 词：增材制造 3D打印 立体光固化 光固化 轻质合金 石膏铸型 精密铸造 高温性能 

分 类 号：TG249[金属学及工艺—铸造]