【摘要】：隨著印鐵行業(yè)的不斷發(fā)展,在金屬薄板印涂領(lǐng)域?qū)ν繉雍穸鹊臋z測技術(shù)提出了越來越高的要求。目前企業(yè)常用的涂層厚度檢測方法為烘干稱重估算法,該方法測量精度不高、存在滯后性。此外,市場上也出現(xiàn)了一些涂層測厚儀,例如磁電式、渦流式、激光式等,這些測厚儀的優(yōu)點是操作方便、價格便宜,缺點是多為手持式、接觸式測量,且測點有限,無法實現(xiàn)金屬薄板全平面的涂層厚度自動測量與均勻性評估。為實現(xiàn)金屬薄板全平面的涂層厚度高精度、非接觸式自動檢測,基于激光雙測頭測厚技術(shù),結(jié)合機械伺服系統(tǒng),設(shè)計了印鐵涂層厚度檢測系統(tǒng)。論文的主要工作如下:1.提出了一種利用激光雙測頭實現(xiàn)金屬薄板涂層厚度測量及均勻性評估的方法。激光雙測頭差分測量原理可減小金屬薄板Z向位置變化和機械振動等因素對測量結(jié)果的影響,結(jié)合機械伺服系統(tǒng),通過激光雙測頭的掃描測量,實現(xiàn)全板涂層厚度的非接觸式測量,并根據(jù)所測厚度數(shù)據(jù)評估涂層厚度的均勻性。2.設(shè)計了基于激光雙測頭的印鐵涂層厚度檢測系統(tǒng)。包括機械裝置和測控系統(tǒng)的軟硬件。機械裝置主要由機架、X向金屬薄板傳送機構(gòu)、Y向掃描測厚機構(gòu)組成,介紹了各部分的組成和設(shè)計思路。測控系統(tǒng)硬件包括激光雙測頭、步進電機等的選型和接線,軟件主要功能有膜厚測量、數(shù)據(jù)處理和三維擬合等。3.針對涂層厚度均勻性評估,提出一種膜厚評估算法。采用最小二乘原理與三次樣條插值運算相結(jié)合,實現(xiàn)離散膜厚數(shù)據(jù)的三維擬合,并運用灰色理論對系統(tǒng)測量不確定度進行估計,解決了有限測點數(shù)據(jù)評估全板厚度均勻性準確度不高的問題。4.對系統(tǒng)進行了精度分析與實驗測試。分析了激光雙測頭的線性度、重復(fù)性、采集同步性等性能參數(shù),對機械裝置的傳動機構(gòu)精度、測厚平臺平面度等影響因素進行了實驗分析和改進。選擇金屬薄板印涂試件進行涂層厚度測量,并根據(jù)膜厚評估算法對結(jié)果進行均勻性評估。實驗結(jié)果表明檢測系統(tǒng)穩(wěn)定可靠,涂層厚度測量結(jié)果的三維圖形極差約為1.4μm,系統(tǒng)測量不確定度為1.6μm,滿足企業(yè)需求。
[Abstract]:With the development of the printing iron industry, the testing technology of coating thickness is required more and more in the field of sheet metal printing and coating. At present, the coating thickness measurement method commonly used in enterprises is the weight estimation method, which has low precision and lag. In addition, there are also some coating thickness gauges on the market, such as magnetoelectric, eddy current, laser, etc. The advantages of these thickness gauges are easy to operate and cheap, but the disadvantages are mostly hand-held, contact-type measurement, and limited measuring points. It is impossible to realize automatic measurement and uniformity evaluation of coating thickness in all plane of metal sheet. In order to realize the high accuracy and non-contact automatic measurement of coating thickness in all plane of metal sheet, a thickness measuring system of Indian iron coating was designed based on laser double probe thickness measurement technology and mechanical servo system. The main work of this paper is as follows: 1. In this paper, a method of measuring the thickness and uniformity of thin metal coating by using laser double probe is presented. The principle of laser double probe differential measurement can reduce the influence of the change of Z direction position and mechanical vibration of metal sheet on the measurement results. Combined with the mechanical servo system, the scanning measurement of laser double probe is carried out. The non-contact measurement of the thickness of the whole plate coating is realized, and the uniformity of the coating thickness is evaluated according to the measured thickness data. 2. The thickness measuring system of Indian iron coating based on laser double probe is designed. Including mechanical devices and measurement and control system hardware and software. The mechanical device is mainly composed of frame, X-to metal plate transfer mechanism and Y-direction scanning measuring mechanism. The composition and design idea of each part are introduced. The hardware of the measurement and control system includes the type selection and wiring of laser double probe, step motor and so on. The main functions of the software are film thickness measurement, data processing and 3D fitting etc. An algorithm for evaluating the thickness uniformity of coatings is proposed. Using the least square principle and cubic spline interpolation, the 3-D fitting of the discrete film thickness data is realized, and the uncertainty of the system measurement is estimated by using the grey theory. It solves the problem that the accuracy of evaluating the thickness uniformity of the whole plate is not high. 4. The precision analysis and experimental test of the system are carried out. The linearity, repeatability and synchronism of the laser double probe are analyzed. The influence factors such as the accuracy of the transmission mechanism and the flatness of the measuring platform are analyzed and improved experimentally. The thickness of the coating was measured and the uniformity of the results was evaluated according to the film thickness evaluation algorithm. The experimental results show that the measurement system is stable and reliable. The 3D graphic range of coating thickness measurement results is about 1.4 渭 m, and the uncertainty of measurement is 1.6 渭 m, which meets the needs of enterprises.
【學(xué)位授予單位】：南通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG173

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