Papers by Keyword: Cutting Quality

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Authors: Jia You Wang, C.H. He, W.H. Li, F. Yang
Abstract: The present work experimentally investigates the cut quality for underwater dual swirling plasma arc process at different operating gases. With a decrease in the oxygen content of the cutting operating gas, kerf shape and cut surface smoothness go well, but the adherent dross and cut hardness increase while cutting heat affected zone becomes wide. On the low-speed side of the cut, there are smaller bevel angle, more dross, and greater straightness and hardness. Compared with the dry plasma cutting, the underwater plasma process yields a cut of better shape but higher hardness.
Authors: Xiao Lai, Shang Ping Li, S. Liang, F.L. Ma, Z.Q. Cheng, X.B. Dai
Abstract: The cutting stiffness has notable influence on the sugarcane cutting quality, so great importance should be laid on enhancing the cutting stiffness when designing the cutting device. Based on cutting mechanism analysis, this paper proposes a new design of cutting device to increase the cutting stiffness by properly adding an auxiliary support bar and builds up 3D model of it. Then combining of virtual simulation analysis and physical experiment, it compares and analyzes the different stiffness and cutting quality with support bar in various support position or without it. The result shows that the new design with properly mounted support bar can raise 15.30% of the cutting stiffness, and consequently improve the sugarcane cutting quality distinctly.
Authors: Jia You Wang, J.H. Yu, C.H. He, F. Yang
Abstract: The present work proposes a novel plasma cutting system using the ultrasonic frequency pulsed arc, and then experimentally investigates the effect of pulse process parameters on cut quality in the frequencies of 20-60 kHz. It is shown that kerf widths, bevel angle, straightness and dross attached level decrease obviously with the appropriate increases in the frequency and amplitude of pulse current. Furthermore, cutting heat affected zone narrows and cut hardness drops clearly in the pulsed cutting. This current pulsation can thus improve plasma cut quality remarkably, and finally leads to a narrower, flatter and more perpendicular cut of better remachinability. Experimental results simultaneously demonstrate that the effectiveness of the ultrasonic-frequency pulsed cutting process developed at the low current of arc.
Authors: Xu Yue Wang, Wen Ji Xu, Ren Ke Kang, Yi De Liang
Abstract: An experimental analysis is presented which investigates the relationship between cutting parameters and the volume of material removal as well as its cutting quality on a Nd:YAG laser cutting system. The parameters that varied on two testing thickness during cutting include cutting speed, incident laser power and focal position in a continuous through cut. Various trends of the kerf geometrical features in terms of the varying process parameters are analyzed and shown to be reasonable. Discussions are also given on kerf geometry control in situations with cutting parameters. It shows that the effects of varying parameters such as cutting speed, laser power and focal position on cutting kerf width, surface roughness, and striation that have provided a deeper understanding of the laser machining.
Authors: Wu Xue, K. Kusumoto, Kikuo Nezu
Abstract: Plasma arc cutting sound has close relation with cutting conditions, so it contains useful information about this cutting process. In order to analyze the relationship between the plasma arc cutting acoustic signal and cut quality (including top and bottom kerf widths, bevel angle and dross attached level), a number of experiments under various cutting speeds have been carried out. It is shown that SPL (sound pressure level) of cutting acoustic signal shows mountain-shaped distribution with an increase of bottom kerf width. Experimental results also suggest the possibility to make an acoustic-based quality monitoring system for plasma arc cutting process.
Authors: Ke Hua Zhang, Li Min, Dong Hui Wen
Abstract: A half of covering angle processing method is proposed for optimizing process efficiency and quality with ball-end tool axis tilt. Firstly, according to the features of ball-end tool structural, this paper introduced traditional no-tilt processing problems, such as tool fast wear and poor processing quality, and then verified the effect of tool tilt processing by analyzing and comparing cutting quality with the differences of the no-tilt processing and tilt processing. Finally, it introduced two optimization methods about tool tilt processing, and also made a comparison with its feature. The results show that traditional processing brings about more extrusion and scratches, while little and high efficiency with method of tool tilt processing. Conclusion: it not only brings higher processing quality and efficiency, but also can make the ball-end cutter be longevity of service.
Authors: Xiao Lai, Shang Ping Li, Fang Lan Ma, Zhi Wen Qin, Jing Hui Zhou, Guang Ping Zheng
Abstract: The Sugarcane field excitation has notable influence on the sugarcane cutting quality, but its mechanism has seldom been studied. Based on the dynamic model analysis, this paper measure, analysis and test how the field excitation impacts the vibration of the cutter. After building up 3D model of the vehicle and field system, virtual simulation analysis on it is carried out, deducing that the frequency of field unevenness has notable influence on the vibration of the cutter. In physical experiment, it compares and analyzes the vibration of the cutter and cutting quality under different frequencies of field unevenness. The result shows that, the frequency of field unevenness has magnificent influence on the vibration of the cutter, and the higher the frequency the more deteriorated the sugarcane cutting quality.
Authors: Tie Ling Ji, Ya Ting Teng
Abstract: This paper has a brief introduction to a algorithm that can automatically identify the defective cutting region when automatic paper cutter does quality analysis. The algorithm analyzed the characteristics of processed shear mark image,detected defects,found a critical point of defective part ,then a unique regional recognition algorithm was developed based on the basis of the general processing algorithm. The algorithms can pinpoint the region that cutting defects exist according to the coordinates of critical point accurately, improve the efficiency of quality analysis, and also has stated that image processing is available in the regional recognition of automatic paper cutter.
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