【摘要】：光固化快速成型技術(shù)是快速成型制造技術(shù)中最早發(fā)展起來的,也是目前研究較為深入的一種快速成型技術(shù)。該技術(shù)適合于新產(chǎn)品的開發(fā)、不規(guī)則或復(fù)雜形狀零件制造,如具有復(fù)雜形面的飛行器模型和風(fēng)洞模型、外觀評估和裝配檢驗(yàn)、快速反求與復(fù)制,也適用于難加工材料的制造。這項(xiàng)技術(shù)不僅在制造業(yè)具有廣泛的應(yīng)用,而且在材料科學(xué)與工程、醫(yī)學(xué)、文化藝術(shù)等領(lǐng)域也有廣闊的應(yīng)用前景。 近些年國內(nèi)研發(fā)出了以紫外光作為主要光源的光固化快速成型機(jī),這類機(jī)器的設(shè)備造價(jià)和運(yùn)行成本都明顯低于激光成型機(jī),但是成型精度較差。本文以紫外光快速成型精度問題為主要研究對象,以CPS350快速成型機(jī)為實(shí)驗(yàn)設(shè)備,在理論分析的基礎(chǔ)上,進(jìn)行大量基礎(chǔ)性實(shí)驗(yàn)研究。 本文從理論上介紹光固化快速成型的基本原理,并系統(tǒng)的分析了成型的前期數(shù)據(jù)處理、成型加工過程和后處理三個(gè)階段各因素對成型精度的影響。 針對光敏樹脂溶脹性問題,進(jìn)行了實(shí)驗(yàn)分析；應(yīng)用反求技術(shù)對異形件進(jìn)行數(shù)據(jù)采集及建模,然后對實(shí)驗(yàn)后出現(xiàn)的尺寸偏差及其變化規(guī)律等問題,進(jìn)行進(jìn)一步的實(shí)驗(yàn),可以總結(jié)出掃描線長、樹脂性能及掃描系統(tǒng)加減速運(yùn)動等因素對成型制件精度的影響規(guī)律,從而提出光掃描運(yùn)動控制系統(tǒng)在換向階段采用變加速度運(yùn)動方式的改進(jìn)措施。針對實(shí)驗(yàn)中出現(xiàn)的X型缺陷,提出增加可控遮光系統(tǒng)的觀點(diǎn)。 由于影響光固化快速成型制件精度的工藝參數(shù)有很多,本文以三方向尺寸誤差為測量指標(biāo),設(shè)計(jì)并進(jìn)行四因素三水平的正交試驗(yàn),利用方差分析的方法,研究掃描速度、光斑補(bǔ)償、分層厚度和掃描間距對成型制件精度的影響規(guī)律,并試圖給出一定范圍內(nèi)的最佳工藝參數(shù)組合。 同時(shí),提出了改進(jìn)成型制件精度的措施和方法,對紫外光快速成型技術(shù)的發(fā)展有一定的指導(dǎo)意義。
[Abstract]:The rapid prototyping technology of light curing is the earliest developed in the rapid prototyping manufacturing technology, and it is also a kind of rapid prototyping technology studied more deeply at present. This technology is suitable for the development of new products, the manufacture of irregular or complex shape parts, such as the aircraft model and wind tunnel model with complex shape surface, appearance evaluation and assembly inspection, rapid reverse calculation and reproduction, and also suitable for the manufacture of difficult to be machined material. This technology not only has a wide application in manufacturing industry, but also has a broad application prospect in material science and engineering, medicine, culture and art and so on. In recent years, a light curing rapid prototyping machine with ultraviolet light as the main light source has been developed in China. The equipment cost and operation cost of this kind of machine are obviously lower than that of laser molding machine, but the forming accuracy is poor. In this paper, the precision of UV rapid prototyping is taken as the main research object, and the CPS350 rapid prototyping machine is used as the experimental equipment. On the basis of theoretical analysis, a large number of basic experimental studies are carried out. In this paper, the basic principle of light curing rapid prototyping is introduced in theory, and the influence of three factors on the forming precision is analyzed systematically, such as the data processing in the early stage, the process of forming and the post-processing. The swelling property of Guang Min resin was analyzed experimentally. The data acquisition and modeling of the special-shaped parts are carried out by using reverse engineering technology. Then, the scanning line length can be summed up by further experiments on the problems such as the size deviation and its variation law after the experiment. The influence of resin properties and acceleration and deceleration motion of scanning system on the precision of forming parts is discussed. Therefore, the improvement measures of variable acceleration motion mode in the phase of commutation of optical scanning motion control system are put forward. Aiming at the X-type defect in the experiment, the idea of adding controllable shading system is put forward. Because there are many technological parameters that affect the precision of photocuring rapid prototyping, this paper designs and carries out the orthogonal experiment with four factors and three levels, and studies the scanning speed by means of variance analysis, taking the three-direction dimension error as the measuring index. The effect of spot compensation, layer thickness and scanning spacing on the precision of the forming parts is discussed. The optimum process parameters are also given in a certain range. At the same time, the measures and methods to improve the precision of forming parts are put forward, which is of certain guiding significance to the development of UV rapid prototyping technology.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH16

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