本文關鍵詞： IMD技術 圖案變形 評價方法 幾何形狀 色彩　出處：《浙江工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著塑料在各種領域中的廣泛運用,人們對塑料產(chǎn)品表面裝飾的要求越來越高,傳統(tǒng)的表面裝飾技術已經(jīng)漸漸無法滿足新產(chǎn)品的要求,因此模內(nèi)裝飾(In Mold Decoration)技術便應運而生。但是在實際生產(chǎn)中,常常會因為IMD膜片上圖案的變形而導致產(chǎn)品表面質(zhì)量的不合格。本文針對IMD膜片在成型過程中圖案的變形,提出一種能夠準確的定量評價圖案變形情況的方法,其具體工作如下所示:(1)提出一種針對IMD膜片上圖案變形的評價方法。通過圖案幾何形狀和圖案色彩兩個方面能夠定量地評價圖案在膜片的各個區(qū)域內(nèi)的變形情況。(2)通過對ABAQUS軟件的后處理進行二次開發(fā)以及采取適當測量技術和圖像處理技術這兩種不同的手段,分別提取得到仿真和實際膜片上網(wǎng)格的變形結(jié)果數(shù)據(jù)。根據(jù)所設計的Python算法將膜片上網(wǎng)格的變形結(jié)果數(shù)據(jù)轉(zhuǎn)換為圖案網(wǎng)格的變形結(jié)果數(shù)據(jù)。并構(gòu)建變形后膜片的雙三次B樣條曲面,計算得到各個評價參數(shù)。(3)構(gòu)建圖案色彩變化的評價模型,以色差值作為主要的評價標準。將色差值以云圖的形式顯示,實現(xiàn)對膜片上各區(qū)域內(nèi)色彩變化結(jié)果的評價和分析。(4)構(gòu)建圖案幾何形狀變形的評價模型,以網(wǎng)格的面積變化、直線扭曲度、網(wǎng)格尺寸拉伸比、角度變化等作為評價指標。將這些評價指標值以云圖的形式顯示,實現(xiàn)對膜片上各區(qū)域內(nèi)圖案幾何形狀的變化情況的綜合分析。(5)上述的評價方法及算法經(jīng)實例應用和仿真分析,結(jié)果證明它們是合理有效的。
[Abstract]:With the wide use of plastics in various fields, people have higher and higher requirements for the surface decoration of plastic products. The traditional surface decoration technology has gradually failed to meet the requirements of new products. As a result, the technology of in Mold Decoration emerges as the times require, but in the actual production. Because of the deformation of the pattern on the IMD diaphragm, the surface quality of the product is often not up to standard. This paper aims at the deformation of the pattern in the forming process of the IMD diaphragm. This paper presents an accurate quantitative evaluation method for pattern deformation. Its work is as follows: 1). This paper presents an evaluation method for pattern deformation on IMD film, which can quantitatively evaluate the deformation of pattern in each region of the film by means of pattern geometry and pattern color. Through the second development of post-processing of ABAQUS software and the adoption of appropriate measurement technology and image processing technology these two different means. Based on the Python algorithm designed, the deformation data of the mesh on the diaphragm is transformed into the deformation result data of the pattern grid, and the deformation result data of the pattern grid is constructed. The bicubic B-spline surface of the hind diaphragm. The evaluation model of pattern color change is constructed, and the color difference value is taken as the main evaluation standard. The color difference value is displayed in the form of cloud image. Evaluation and analysis of the results of color change in each region on the diaphragm. (4) the evaluation model of pattern geometric shape deformation is constructed, and the mesh area change, straight line distortion, mesh dimension stretch ratio are used. Angle change is used as evaluation index. These evaluation index values are displayed in the form of cloud map. A comprehensive analysis of the variation of pattern geometry in each region of the diaphragm is realized. (5) the above evaluation methods and algorithms are applied and simulated by an example, and the results show that they are reasonable and effective.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ320.721

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本文編號：1461238