【作者】 王文杰；

【导师】 邹平；

【作者基本信息】 东北大学 ， 机械工程（专业学位）， 2018， 硕士

【摘要】 目前,随着国内外学者对NOMEX蜂窝复合材料各优良特性的研究日渐深入,NOMEX蜂窝复合材料已被应用于航空航天、汽车制造、船舶以及雷达制造等各个领域,使得NOMEX蜂窝复合材料的需求大幅度增加,而由于NOMEX蜂窝材料在面内具有较弱的刚度,采用传统的机械加工方式会产生胞元压塌等现象,无法实现NOMEX蜂窝芯材料的高质、高效加工,故目前广泛采用的加工方式有高速铣削加工与超声切割加工两种加工方式;考虑到超声加工具有加工效率高,加工表面质量高以及绿色环保等优点,使超声切割NOMEX蜂窝复合材料技术逐渐成为研究的焦点,但对超声切割NOMEX蜂窝芯材料的切割机理研究,尚未形成系统、完善的理论体系,针对此,本文在对超声切割NOMEX蜂窝芯材料的平均切割力模型进行了研究与完善,并应用所设计的直刃刀具进行了 NOMEX蜂窝材料超声切割试验,验证了所设计的直刃刀具与建立的力学模型的合理性。本文的主要研究内容包括:(1)研究了 NOMEX蜂窝复合材料的各优良特性、应用领域以及加工方法,分析了超声切割技术在加工NOMEX蜂窝芯材料方面的优势,总结了超声切割NOMEX蜂窝芯材料的研究现状,明确了研究的目的与意义;(2)根据超声切割NOMEX蜂窝芯材料实验需要,设计了满足实验要求的直刃刀具,并使用ANSYS WORKBENCH有限元分析软件对刀具结构尺寸进行优化,并对优化后的刀具进行了谐响应分析,验证了设计以及优化的合理性;(3)对NOMEX蜂窝芯材料力学性能以及各等效参数进行了分析研究,得到了后续超声切割NOMEX蜂窝芯材料过程切割力数值仿真所需的各主要等效参数;(4)对超声切割NOMEX蜂窝芯材料过程进行了动力学分析,建立了超声切割NOMEX蜂窝芯材料过程平均切割力的力学模型,并使用MATLAB软件对其进行了数值仿真分析,以便研究切割力与各切割参数之间的关系;(5)使用所设计的直刃刀具与超声切割工作台对超声切割NOMEX蜂窝芯材料过程进行了实验分析,先后进行了直刃刀具试切实验与平均超声切割力单因素验证实验,验证了所设计刀具与建立的力学模型的合理性,并使用超景深显微镜,对切割表面质量进行测量与分析,验证了各切割参数与切割表面质量之间的关系。更多还原

【Abstract】 At present,many scholars have studied the excellent properties of NOMEX honeycomb composites,NOMEX honeycomb composites have been applied to various fields,such as aerospace,automobile,ship and radar manufacturing,so that the demand for NOMEX honeycomb composites is greatly increased.Because the NOMEX honeycomb materials have weak stiffness in the surface,the traditional machining methods will cause some defects,such as cell element collapse.So the traditional machining methods can’t achieve the high quality and high efficiency machining of the NOMEX honeycomb core material.Two kinds of machining methods are widely used at present,high speed milling and ultrasonic cutting.Considering that ultrasonic machining has the advantages in high processing efficiency,high surface quality and environmental protection,ultrasonic cutting NOMEX honeycomb composites have gradually become the focus of research.However,the research on the cutting mechanism of ultrasonic cutting NOMEX honeycomb core materials has not yet formed a systematic and perfect theory.In this paper,the average cutting force model of ultrasonic cutting NOMEX honeycomb core is studied and perfected,and the ultrasonic cutting experiment of NOMEX honeycomb material is carried out.The reasonableness of the designed straight edge tool and the established mechanical model is verified.The main contents of this paper include:(1)The excellent properties,application fields and processing methods of NOMEX honeycomb composites are studied.The advantages of ultrasonic cutting technology in the machine of NOMEX honeycomb core are analyzed,and the research status of ultrasonic cutting NOMEX honeycomb core materials is summarized,and the purpose and significance of the research are clarified.(2)According to the needs of ultrasonic cutting NOMEX honeycomb core materials,a straight edge tool is designed to meet the requirements of the experiment The tool structure size is optimized with the ANSYS WORKBENCH software,and the harmonic response analysis of the optimized cutter is carried out,and the rationality of the design and optimization is verified.(3)The mechanical properties and the equivalent parameters of the NOMEX honeycomb core materials are analyzed and studied.The main equivalent parameters which is required by the numerical simulation of ultrasonic cutting NOMEX honeycomb core are obtained.(4)The dynamic analysis of ultrasonic cutting NOMEX honeycomb core material is carried out.The mechanical model of the average cutting force for ultrasonic cutting NOMEX honeycomb core is established,and the numerical simulation analysis is carried out by using MATLAB software to study the relationship between the cutting force and the cutting parameters.(5)The experimental analysis of ultrasonic cutting NOMEX honeycomb core was carried out by using the designed cutting tool.The rationality of the designed tool and the established mechanical model was verified.Micro mirror is used to measure and analyze the cutting surface quality,and the relationship between cutting parameters and cutting surface quality is verified.更多还原