共查询到18条相似文献,搜索用时 93 毫秒
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为了实现等离子电弧加热的精确弯曲成形,采用等离子电弧沿直线对1Cr18Ni9Ti不锈钢板材进行加热弯曲成形试验,并用CMOS1303uc数字相机等硬件和相关软件在等离子电弧加热弯曲成形的过程中对弯曲角度进行实时检测,实现了对成形过程的闭环控制。试验结果表明:当扫描次数较少时,板材弯曲角度随扫描次数增加近似呈线性增大;当扫描次数较多时,由于增厚效应的影响,单次扫描弯曲角度的增量会不断减小,弯曲效率明显降低。为了确保加工过程的可靠性并提高成形效率,根据加工余量的不同将成形过程分为粗、中、精三个加工阶段,各个阶段分别采用不同的工艺参数进行加工,通过弯曲角度分别为20°和30°的不锈钢薄板的成形试验验证了该方法的有效性。 相似文献
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以不锈钢薄板的激光弯曲成形为研究对象,研究其成形的工艺过程及影响因素;介绍实验设备和激光调焦方法。通过实验研究了激光能量因素、扫描速度因素、激光光斑大小和扫描次数等因素对弯曲成形角度的影响。 相似文献
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综述了近年来国内外对激光弯曲成形技术的研究现状,概述了激光工艺参数、板料几何参数及材料性能等因素对弯曲成形的影响,分析了扫描轨迹对成形结果的影响以及激光成形闭环控制系统的应用,并对板料激光弯曲成形的应用和发展前景作了展望。 相似文献
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综述了近年来国内外对激光弯曲成形技术的研究现状,概述了激光工艺参数、板料几何参数及材料性能等因素对弯曲成形的影响,分析了扫描轨迹对成形结果的影响以及激光成形闭环控制系统的应用,并对板料激光弯曲成形的应用和发展前景作了展望。 相似文献
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Xiaoyong Tian Bo Sun Jürgen G. Heinrich Dichen Li 《The International Journal of Advanced Manufacturing Technology》2013,64(1-4):239-246
A finite element model was developed to simulate the influence of laser scan patterns (laser jump patterns, ratio of length to width and laser scan angle) on the temperature and stress distributions in the process of laser direct sintering ceramics. The effects of laser scan patterns on the stresses in the laser directly sintered ceramic samples were investigated by simulation. Different ceramic samples were prepared by the laser sintering process for the four-point bending strength measurement. The simulation results consist with the experimental ones. The results in the present research can be used to optimize process route for the laser direct sintering process and provide a guidance for selecting the laser processes parameters for high mechanical strength ceramic components. 相似文献
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F. Lambiase A. Di Ilio A. Paoletti 《The International Journal of Advanced Manufacturing Technology》2013,64(5-8):829-840
The effect of passive water cooling in laser forming of thin sheets made of AISI 304 stainless steel is experimentally investigated. Indeed, since each laser scan can produce only small bending angles, multiple laser scans are required to produce a given deformation with a significant increase of production time due to cooling between consecutive scans. Therefore, passive water cooling is tested to verify its influence on minimum time between consecutive scans (cooling time), bending angle, and surface quality. A parametric approach is involved in the investigation and main process parameters are changed among the experiments by varying laser scanning speed, laser beam power, sheet thickness, and cooling media among several levels. It was discovered that the employment of passive water cooling in laser forming of thin sheets would be beneficial since the capability to dramatically reduce the cooling time and oxidation of both irradiated and cooled surfaces. In addition, the bending angle is only marginally affected by employment of water cooling. The effect of water cooling on stress and deformations are discussed by developing a numerical model based on finite element model. 相似文献
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长脉宽脉冲激光硅片弯曲成形试验 总被引:1,自引:1,他引:0
利用毫秒脉宽Nd:YAG激光对硅片进行了弯曲试验,给出了长脉宽脉冲激光弯曲硅片的能量阈值条件。研究了长脉宽Nd:YAG激光脉冲频率和脉冲宽度参数对硅片弯曲角度的影响,同时说明了脉冲频率和脉冲宽度参数对弯曲角度的影响可以转换成扫描速度和功率密度对弯曲角度的影响,并对试验结果进行了分析,引入了脉冲占空比来表征能量的时域分布对弯曲现象的影响。试验结果表明,采用毫秒量级脉冲激光可以对硅片进行弯曲加工,弯曲角度可达20°以上。 相似文献
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Process simulation and optimization of laser tube bending 总被引:1,自引:1,他引:0
Yanjin Guan Guiping Yuan Sheng Sun Guoqun Zhao 《The International Journal of Advanced Manufacturing Technology》2013,65(1-4):333-342
A 3D thermomechanical finite element analysis model for laser tube bending is developed based on the software MSC/Marc. The processes of single- and multi-scan are analyzed numerically. The gradient and development of the temperature between the laser scanning side and the nonscanning side leads to the changing complexity of the stress and strain. Consequently, the length of the laser scanning side becomes shorter than that of nonscanning side after cooling. The length difference between both sides makes the tube produce the bending angle. The relationship between the number of scans and the bending angle is about in direct ratio. The bending angle induced by the first irradiated time is largest. Meanwhile, the finite element simulation is integrated with the genetic algorithm. Aiming at different process demands, corresponding objective functions are established. Laser power, beam diameter, scanning velocity, and scanning wrap angle are regarded as design variables. Process optimizations of maximum angle bending and fixed angle bending after single laser scan are realized. Groups of optimized process parameters can be obtained according to different optimization objectives. The bending angle can approach to the maximum when the laser power, spot diameter, scanning velocity, and scanning wrap angle are 381.24 W, 3.37 mm, 16.34 mm/s, and 123.1°, respectively. When the laser power, spot diameter and scanning velocity are 426.12 W, 4.9 mm, 14.31 mm/s respectively, a fixed angle bending can be achieved. 相似文献
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Al2O3陶瓷薄片CO2连续激光弯曲试验研究 总被引:1,自引:1,他引:0
脆性材料的激光弯曲成形技术是激光快速成形技术的重要应用,有着广阔的应用前景。本文通过改变激光功率、扫描速度等工艺参数,利用CO2连续激光对氧化铝陶瓷薄片进行弯曲试验,同时引入线能量密度来寻求适合弯曲的最佳工艺参数,并结合氧化铝陶瓷的高温性能分析了其激光弯曲特点。试验结果表明:采用CO2连续激光可以对氧化铝陶瓷薄片进行弯曲,弯曲角度可达2°;氧化铝陶瓷的激光弯曲过程具有强烈的温度敏感性,当试样表面温度大于临界温度时,弯曲角度迅速增加;适合弯曲的最佳线能量密度范围为17~24 J/mm 。 相似文献
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利用激光扫描编织摩擦材料能明显提高其摩擦性能。采用正交试验设计的方法优化激光工艺参数,以激光电流、扫描速度、离焦量和扫描轨迹为试验因素。试验结果表明,影响编织摩擦材料的摩擦性能最主要因素是温度,激光扫描编织摩擦材料的最佳试验参数:激光电流为13.5 A、扫描速度为700 mm/m in、离焦量为2 mm、扫描轨迹是间距为0.5 mm的矩形波。揭示了激光扫描后编织摩擦材料热衰退机理。 相似文献