面曝光快速成形光固化实验研究
发布时间：2018-08-17 18:40
【摘要】：随着社会需求的不断增加,人们生活质量的不断提高,个人消费也逐步的个性化,从而对工业产品的生产不断提出新要求。在这种产品多元化,个性化,小批量和复杂化的同时,在激烈市场竞争的驱使下,制造企业为了保持产品在市场上的竞争力,必须缩短产品的设计周期和生产周期,传统的制造方法已经不能满足这种市场需要,于是产生了快速成形技术。 快速成形技术,是当今世界上新型制造技术之一,最近在世界范围内发展很快。它是继数控技术之后,20世纪制造领域的又一重大突破,是当代先进制造技术的重要组成部分。 面曝光快速成形技术是快速成形技术的一种,它的工作原理是,首先将绘制或者扫描得到的三维CAD模型分层,然后以DMD或者LCD在工作面成像作为动态掩膜,对成形材料进行曝光操作。每次曝光制作一层,逐层累加,最终生成与三维CAD模型近似的实体制件,其近似程度就是快速成形系统的制造精度。影响制造精度的主要因素有两个,分别是视图发生器的光学分辨率和光敏树脂的固化特性。 本文首先对面曝光快速成形系统的总体结构做了介绍,分析了快速成形系统中视图发生器的组成和基本原理,提出了一种高分辨率视图发生器的实现方案,采用投影仪的DMD与物镜一体结构,有效的避免了光轴对偏导致的像面光照度不均和成像失真等问题。并在此方案的基础上,设计了新的光学成像系统。在光学成像系统设计的过程中,使用ZEMAX软件确定了光阑的位置,并对成像系统像差进行了优化。经过成像测试实验,结果显示其成像精度满足面曝光快速成形的实验要求。 然后探讨了本实验用光敏树脂的成分和固化原理。通过理论分析,建立了面曝光快速成形系统工作面的光能量分布模型,使用高斯函数和像素光强累加的办法对工作面的光强分布进行描述,并建立了树脂光固化的数学模型,在此基础上计算了光敏树脂的临界曝光量和透射深度等参数,为进一步研究光敏树脂的固化特性打下了基础。 通过综合光强分布模型和树脂的光固化模型,预测了曝光能量、掩模宽度和固化深度,固化宽度之间的关系。通过分析实验数据,得出光固化模型对树脂实际固化情况模拟得较好的结论。在此基础上建立了光敏树脂的过固化模型,对过固化形成原因和影响过固化深度的因素进行了深入研究。通过对实验数据的分析,找到了控制过固化深度的具体方法。 最后在本文研究的基础上,制作了具有代表性的零件,来说明本研究的成果和实际意义。
[Abstract]:With the continuous increase of social demand, people's quality of life is constantly improving, and individual consumption is gradually individualized, thus putting forward new requirements for the production of industrial products. Competitiveness requires shortening the design and production cycles of products. Traditional manufacturing methods can no longer meet the needs of the market, so rapid prototyping technology has emerged.
Rapid prototyping (RP) is one of the new manufacturing technologies in the world, and it has developed rapidly in the world recently. It is another important breakthrough in the manufacturing field of the 20th century after NC technology, and it is an important part of the modern advanced manufacturing technology.
Surface exposure rapid prototyping technology is a kind of rapid prototyping technology. Its working principle is firstly to lay the 3D CAD model drawn or scanned, and then to use DMD or LCD as a dynamic mask to expose the forming material. The approximation degree of an approximate solid part is the manufacturing accuracy of a rapid prototyping system. There are two main factors affecting the manufacturing accuracy: the optical resolution of the view generator and the curing characteristics of the photosensitive resin.
Firstly, this paper introduces the overall structure of the face exposure rapid prototyping system, analyzes the composition and basic principle of the view generator in the rapid prototyping system, and puts forward a high resolution view generator implementation scheme. The DMD of the projector is integrated with the objective lens, which effectively avoids the image illumination caused by the optical axis offset. Based on this scheme, a new optical imaging system is designed. In the process of designing the optical imaging system, the position of the aperture is determined by ZEMAX software, and the aberration of the imaging system is optimized. Requirements for inspection.
Then the composition and curing principle of photosensitive resin are discussed. The light energy distribution model of the working face of the surface exposure rapid prototyping system is established by theoretical analysis. The light intensity distribution of the working face is described by the method of Gaussian function and pixel light intensity accumulation, and the mathematical model of resin curing is established. The critical exposure and transmission depth of photosensitive resin were calculated, which laid a foundation for further study of curing characteristics of photosensitive resin.
The relationship among exposure energy, mask width, curing depth and curing width was predicted by combining the light intensity distribution model with the resin curing model. By analyzing the experimental data, it was concluded that the light curing model could simulate the actual curing situation of the resin better. On this basis, the supercuring model of the photosensitive resin was established, and the super-curing model of the photosensitive resin was used for the overcuring. The formation reasons and the factors affecting the depth of overcure were studied in depth. Through the analysis of the experimental data, the concrete methods to control the depth of overcure were found.
Finally, on the basis of this study, representative parts are made to illustrate the results and practical significance of this study.
【学位授予单位】：西安工程大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH16
本文编号：2188544
[Abstract]:With the continuous increase of social demand, people's quality of life is constantly improving, and individual consumption is gradually individualized, thus putting forward new requirements for the production of industrial products. Competitiveness requires shortening the design and production cycles of products. Traditional manufacturing methods can no longer meet the needs of the market, so rapid prototyping technology has emerged.
Rapid prototyping (RP) is one of the new manufacturing technologies in the world, and it has developed rapidly in the world recently. It is another important breakthrough in the manufacturing field of the 20th century after NC technology, and it is an important part of the modern advanced manufacturing technology.
Surface exposure rapid prototyping technology is a kind of rapid prototyping technology. Its working principle is firstly to lay the 3D CAD model drawn or scanned, and then to use DMD or LCD as a dynamic mask to expose the forming material. The approximation degree of an approximate solid part is the manufacturing accuracy of a rapid prototyping system. There are two main factors affecting the manufacturing accuracy: the optical resolution of the view generator and the curing characteristics of the photosensitive resin.
Firstly, this paper introduces the overall structure of the face exposure rapid prototyping system, analyzes the composition and basic principle of the view generator in the rapid prototyping system, and puts forward a high resolution view generator implementation scheme. The DMD of the projector is integrated with the objective lens, which effectively avoids the image illumination caused by the optical axis offset. Based on this scheme, a new optical imaging system is designed. In the process of designing the optical imaging system, the position of the aperture is determined by ZEMAX software, and the aberration of the imaging system is optimized. Requirements for inspection.
Then the composition and curing principle of photosensitive resin are discussed. The light energy distribution model of the working face of the surface exposure rapid prototyping system is established by theoretical analysis. The light intensity distribution of the working face is described by the method of Gaussian function and pixel light intensity accumulation, and the mathematical model of resin curing is established. The critical exposure and transmission depth of photosensitive resin were calculated, which laid a foundation for further study of curing characteristics of photosensitive resin.
The relationship among exposure energy, mask width, curing depth and curing width was predicted by combining the light intensity distribution model with the resin curing model. By analyzing the experimental data, it was concluded that the light curing model could simulate the actual curing situation of the resin better. On this basis, the supercuring model of the photosensitive resin was established, and the super-curing model of the photosensitive resin was used for the overcuring. The formation reasons and the factors affecting the depth of overcure were studied in depth. Through the analysis of the experimental data, the concrete methods to control the depth of overcure were found.
Finally, on the basis of this study, representative parts are made to illustrate the results and practical significance of this study.
【学位授予单位】：西安工程大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH16
【引证文献】
相关硕士学位论文 前1条
1 杨根;面曝光快速成形制作参数优化研究[D];西安工程大学;2012年
，本文编号：2188544
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