本文選題：PLA　切入點(diǎn)：熔融沉積成型　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：熔融沉積成型系統(tǒng)的低成本是相比其他快速成型工藝的一大優(yōu)勢(shì),因而得到了廣泛應(yīng)用。在熔融沉積成型過(guò)程中,工藝參數(shù)對(duì)成型零件的特性能夠產(chǎn)生重要的影響。本文通過(guò)理論分析,以大量的試驗(yàn)研究為基礎(chǔ),對(duì)成型過(guò)程中的主要工藝參數(shù)進(jìn)行分析研究,從而提高了成型件的尺寸精度、成型時(shí)間和彈性性能。本文所做的主要工作及取得的研究成果如下:(1)系統(tǒng)地介紹了影響熔融沉積成型零件精度的因素,從原理性、成型工藝過(guò)程和后處理三個(gè)方面進(jìn)行分析,并針對(duì)各影響因素,提出了相應(yīng)的改進(jìn)措施,為優(yōu)化成型過(guò)程中的工藝參數(shù),提高成型件的尺寸精度、成型時(shí)間和彈性性能提供了方法支撐。(2)以成型零件的出絲過(guò)程為對(duì)象,研究擠出絲材的截面模型,建立絲材的寬度模型;考慮材料收縮特性對(duì)成型件宏觀尺寸的影響,構(gòu)建成型件內(nèi)外輪廓的補(bǔ)償量模型;研究成型加工過(guò)程中的臺(tái)階效應(yīng),建立臺(tái)階誤差的理論模型。(3)以成型零件的尺寸精度為研究對(duì)象,設(shè)計(jì)標(biāo)準(zhǔn)件,通過(guò)正交試驗(yàn),采用不同的多指標(biāo)正交試驗(yàn)分析方法研究分層厚度、路徑寬度和輪廓數(shù)對(duì)尺寸精度的影響,分別得出尺寸誤差最小時(shí)的工藝參數(shù)水平組合。通過(guò)試驗(yàn),研究路徑寬度對(duì)成型件外觀形貌的影響,得到不同尺寸零件外觀形貌最優(yōu)時(shí)的路徑寬度水平。(4)采用PLA材料,研究成型過(guò)程中的工藝參數(shù)對(duì)成型件彈性性能的影響,通過(guò)一套玩具器械反應(yīng)成型件的彈性性能,建立工藝參數(shù)與系統(tǒng)評(píng)價(jià)指標(biāo)間的映射關(guān)系及其模型,進(jìn)行單因素試驗(yàn)和響應(yīng)面試驗(yàn),優(yōu)化成型過(guò)程中的約束條件,并對(duì)模型預(yù)測(cè)最優(yōu)方案進(jìn)行試驗(yàn)驗(yàn)證,為最大限度地利用成型件的彈性性能提供指導(dǎo)。
[Abstract]:The low cost of the melt deposition molding system is one of the advantages over other rapid prototyping processes, so it has been widely used. The process parameters can have an important influence on the characteristics of the forming parts. Based on the theoretical analysis and a large number of experimental studies, the main process parameters in the forming process are analyzed and studied, thus improving the dimensional accuracy of the molded parts. The main work and research results in this paper are as follows: (1) the factors that affect the precision of fused deposition forming parts are introduced systematically, and analyzed from three aspects: principle, forming process and post treatment. According to the influence factors, the corresponding improvement measures are put forward, which can provide method support for optimizing the process parameters, improving the dimensional accuracy, forming time and elastic properties of the forming parts. The cross section model of extruded wire is studied and the width model of wire is established. Considering the effect of material shrinkage on the macro dimension of the forming part, the compensation model of the inside and outside contour of the forming part is constructed. The step effect in the molding process is studied. The theoretical model of step error is established. (3) taking the dimensional accuracy of forming parts as the research object, the standard parts are designed. Through orthogonal test, different multi-index orthogonal test methods are used to study the delamination thickness. The influence of path width and contour number on dimension precision is obtained, and the horizontal combination of process parameters when the dimension error is minimum is obtained. The influence of path width on the appearance and morphology of the molded parts is studied by experiments. The PLA material was used to study the influence of the process parameters on the elastic properties of the molded parts. Through a set of toy instruments, the elastic properties of the molded parts were studied. The mapping relationship between process parameters and system evaluation indexes and its model are established. Single factor test and response surface test are carried out to optimize the constraint conditions in the molding process. It provides guidance for the maximum use of the elastic properties of the molded parts.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH16

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