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Study on the Kerf Quality of Low-carbon Sheet in Fiber Laser Cutting

Author: ZhangXiaoWei
Tutor: WangChunMing
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Laser cutting Technology parameters Criterion Regression analysis Artificial neural network
CLC: TG485
Type: Master's thesis
Year: 2009
Downloads: 304
Quote: 1
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Abstract


Laser cutting, as one of the most important technology in the field of laser-processing, is widely used in the modern industry. Much work about the effects of the cutting parameters on the quality of laser cutting has been done by researchers. Unfortunately, few studies about the systematic summary in laser cutting quality have been reported. In this study, laser cutting was carried out on low-carbon steel plate with a thickness of 2mm. The effects of the experimental parameters on the quality of laser cutting, such as laser power, cutting speed, distance between the nozzle and the sample surface as well as pressure/type of the assistant gas, were systematicly analyzed. Kerf width, kerf roughness, slag thickness and striation spacing were selected as criteria of cutting quality. The influences regulation of cutting parameters on the laser cutting quality were synthetically analyzed. At the same time, a proper cutting parameter window in laser cutting of low-carbon steel was obtained when nitrogen and oxygen were used as assistant gas.Based on experimental data, mathematics models of laser-cutting quality including kerf width, kerf roughness, slag thickness and striation spacing were established by using regression analysis. Furthermore, the models were verified by cutting experiments.The experimental data were trained and analyzed by using artificial neural network, which can forecast the cutting quality and feedback neural network to in turn optimize the models.The experimental errors of cutting quality models established by using regression analysis and artificial neural network were compared. In addition, the synthetical influences of laser output power, cutting speed, nozzle distance from the surface, assistant gas pressure on the cutting quality were studied by using these models.The experimental data of laser cutting low-carbon steel were summarized and analyzed, which provides conditions for the database establishment of technology parameters in laser cutting low-carbon steel and provides experimental basis for establishing a physical model of laser cutting.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Metal cutting and equipment > Laser cutting and equipment
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