【作者】 陈宁；

【导师】 武吉梅； 刘定强；

【作者基本信息】 西安理工大学 ， 轻工技术与工程， 2021， 硕士

【摘要】 增材制造作为一种新型的制造技术,能够制造传统减材制造无法制造的复杂几何结构产品,但由于其表面成型质量精度还无法与传统的减材制造相提并论,因此还没有实现广泛应用。为了提高增材制造的表面成型质量,本文研究了针对表面成型质量的熔融沉积成型的可制造性评价及设计优化,而熔融沉积成型作为一种典型的增材制造技术,其可制造性的相关研究对其他增材制造技术的可制造性研究有很重要的借鉴意义。本课题通过不同成型表面的几何关系来计算表面成型质量的评价指标,建立FDM制件的可制造性综合评价方法,提出通过调整工艺参数和结构优化设计两个途径来提升FDM制件的表面成型质量,最后通过实例来验证理论的可行性。主要内容如下:(1)成型表面质量精度评价指标的研究。确定FDM表面成型质量的评价指标,根据不同成型表面的成型误差的形成机理,建立成型表面的几何结构模型,根据不同成型表面的几何关系推导各成型表面的评价指标计算公式,主要是圆形特征的圆度和成型支撑面的表面粗糙度,成型支撑面的表面粗糙度分为成型斜支撑面和成型平支撑面两类去分析计算。(2)可制造性综合评价方法的构建。基于制造资源的工艺参数范围,通过各评价指标的计算公式,确定制造设备的可制造空间;通过设计要求和可制造空间的综合对比,对评价可能出现的三种情况分别进行了说明。(3)工艺参数优化和结构优化设计的研究。根据各评价指标的计算原理和误差产生原理,分析工艺参数与各评价指标制件的关系;提出结构优化的具体措施,以在设计阶段就避免制造过程中可能出现的误差。(4)设计可制造性评价和工艺参数和结构优化实验。设计三组实验,分别对可制造评价中可能出现的三种情况进行说明验证,验证可制造性评价方法的可行性,以及工艺参数调整和结构优化的有效性。更多还原

【Abstract】 Additive manufacturing,as a new manufacturing technology,can produce complex geometrical products that cannot be manufactured by traditional subtractive manufacturing.However,its surface forming quality accuracy is not comparable to that of traditional subtractive manufacturing,so it has not been widely used.In order to improve the material manufacture surface forming quality,this paper studies the molding on surface quality of the fused deposition molding the manufacturability of the research and design optimization,and fused deposition molding as a kind of typical material manufacturing technology,the manufacturability of the related research of other manufacturability of increasing material manufacturing technology research has very important significance.In this paper,the evaluation index of surface forming quality was calculated through the geometric relationship of different forming surfaces,and the comprehensive evaluation method of fabricability of FDM parts was established.Two approaches were proposed to improve the surface forming quality of FDM parts by adjusting the process parameters and optimizing the structure design.Finally,the feasibility of the theory was verified by examples.The main contents are as follows:(1)Study on the evaluation index of forming surface quality accuracy.Determine the evaluation index of FDM surface forming quality,according to the geometric relations of different forming on the surface of each evaluation index calculation formula of the forming surface,derived mainly characteristics of circular surface roughness,roundness and forming supporting surface forming on the surface of the support surface roughness into forming inclined two categories,bearing surface and forming flat bearing surface to the analysis and calculation(2)Construction of comprehensive evaluation method for manufacturability.Based on the range of process parameters of manufacturing resources,the available manufacturing space of manufacturing equipment was determined by calculating formulas of each evaluation index.Through the comprehensive comparison of the design requirements and the manufacturing space,the three possible conditions of the evaluation are explained respectively.(3)Study on process parameter optimization and structure optimization design.According to the calculation principle and error generation principle of each evaluation index,the relationship between process parameters and each evaluation index is analyzed.The concrete measures of structure optimization are put forward to avoid the possible errors in the manufacturing process at the design stage.(4)Design manufacturability evaluation and process parameters and structure optimization experiments.Three groups of experiments were designed to illustrate and verify the three possible conditions in manufacturability evaluation.更多还原