熔融沉积成型精度分析及工艺参数研究
发布时间：2019-05-16 10:27
【摘要】：熔融沉积快速成型技术(Fused Deposition Modeling, FDM)具有柔性制造、绿色制造以及快速成型的特点,符合产品快速开发、个性化定制等的市场需求,从而被广泛应用于产品开发、模具制作、个性化设计等诸多方面,是快速成型技术的一个重要组成部分。然而由于FDM工艺制件成型精度不高,成型制件存在表面层纹,变形翘曲等缺陷,使FDM技术应用局限于产品开发试制、个性化制作等对制件精度要求较低的领域,制约了熔融沉积成型技术的进一步推广与应用。因此,研究提高FDM工艺产品的成型精度是FDM技术发展所面临的迫切问题。本文结合FDM成型工艺流程,从前处理、成型过程以及后处理三个阶段分析阐述了影响成型制件精度的相关因素。依据各因素对制件精度的影响机理,分析了成型制件尺寸误差、表面误差以及制件形变的成因与表征。根据线性收缩理论提出了不同成型方向上的线性收缩模型,并设计试验分析了成型方向对制件尺寸误差的影响；综合台阶误差模型以及挤出丝截面模型,提出了“层纹”轮廓模型,并对制件层纹幅值的主要影响因素成型角度与扫描速度进行试验研究,得出了其影响规律。根据制件翘曲变形的成因,通过层内应力-应变的分析,推导得出了变形量的计算公式以及主要参数的影响规律。并以MakerBot成型机为平台,通过正交试验设计对各因素的影响进行试验分析,对数学模型进行了验证与补充,得出了各影响因素的主次关系以及最优组合。最后提出了减小翘曲变形的措施,并通过实例加工应用,验证了减小翘曲变形措施的可行性。
[Abstract]:Fused deposition modeling (FDM) has the characteristics of flexible manufacturing, green manufacturing and rapid forming, and is in accordance with the market demand of product rapid development, personalized customization and so on, and is widely used in the aspects of product development, mold production, personalized design and the like. It is an important part of rapid prototyping technology. however, because that mol precision of the FDM proces part is not high, the defects of the surface layer grain and the deformation and the like of the shaped part are defect, the application of the FDM technology is limited to the fields of product development trial production, personalized production and the like, and the precision requirement of the part is low, The further extension and application of the melt-deposition forming technology are restricted. Therefore, the research to improve the forming precision of FDM process products is an urgent problem facing the development of FDM technology. In this paper, the relevant factors that affect the precision of the forming part are analyzed in the process of FDM, the process of the former, the forming process and the post-treatment. The mechanism of the influence of various factors on the precision of the product is analyzed, and the cause and characterization of the dimensional error, surface error and deformation of the product are analyzed. According to the linear shrinkage theory, the linear shrinkage model in different forming direction is put forward, and the influence of the forming direction on the size error of the product is analyzed. The model of the "striation" profile is presented. The main influence factors forming angle and scanning speed of the product layer grain amplitude are studied, and the influence rule is obtained. According to the cause of the warp and deformation of the workpiece, the calculation formula of the deformation and the influence rule of the main parameters are derived by the analysis of the internal stress-strain of the layer. Based on the MakerBot forming machine, the influence of each factor is analyzed by the orthogonal test design, and the mathematical model is verified and supplemented, and the primary and secondary relation of each influence factor and the optimal combination are obtained. Finally, the measures to reduce the warping deformation are put forward, and the feasibility of reducing the warping deformation is verified by the application of the example.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH16
本文编号：2478228
[Abstract]:Fused deposition modeling (FDM) has the characteristics of flexible manufacturing, green manufacturing and rapid forming, and is in accordance with the market demand of product rapid development, personalized customization and so on, and is widely used in the aspects of product development, mold production, personalized design and the like. It is an important part of rapid prototyping technology. however, because that mol precision of the FDM proces part is not high, the defects of the surface layer grain and the deformation and the like of the shaped part are defect, the application of the FDM technology is limited to the fields of product development trial production, personalized production and the like, and the precision requirement of the part is low, The further extension and application of the melt-deposition forming technology are restricted. Therefore, the research to improve the forming precision of FDM process products is an urgent problem facing the development of FDM technology. In this paper, the relevant factors that affect the precision of the forming part are analyzed in the process of FDM, the process of the former, the forming process and the post-treatment. The mechanism of the influence of various factors on the precision of the product is analyzed, and the cause and characterization of the dimensional error, surface error and deformation of the product are analyzed. According to the linear shrinkage theory, the linear shrinkage model in different forming direction is put forward, and the influence of the forming direction on the size error of the product is analyzed. The model of the "striation" profile is presented. The main influence factors forming angle and scanning speed of the product layer grain amplitude are studied, and the influence rule is obtained. According to the cause of the warp and deformation of the workpiece, the calculation formula of the deformation and the influence rule of the main parameters are derived by the analysis of the internal stress-strain of the layer. Based on the MakerBot forming machine, the influence of each factor is analyzed by the orthogonal test design, and the mathematical model is verified and supplemented, and the primary and secondary relation of each influence factor and the optimal combination are obtained. Finally, the measures to reduce the warping deformation are put forward, and the feasibility of reducing the warping deformation is verified by the application of the example.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH16
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