大角度斜面激光切割加工的工艺研究

分析了大角度斜面激光切割的可行性和激光切割加工工艺。结果表明：当激光功率为1260W，光斑直径为0.18mm,以0.08MPa的氧气作用为辅助气体，切割速度为1.4m/min,使喷嘴离工件的距离保持在0.5mm-0.8mm之间并选取适当的CNC程序直线插补步长，可以实现6mm厚的15Cr2Mo1钢大角度斜面的激光切割，切口质量良好。     

碳钢板激光切割工艺分析及优化

随着科技的不断发展,激光切割技术已经成为现代工业生产中不可或缺的技术之一,碳钢激光切割件加工技术也得到越来越多的应用。随着对加工工件的质量要求越来越高,对激光加工工艺进行优化以获得更高切割质量与切割精度的钢板具有重要意义。为了优化碳钢的激光加工工艺,文章以3 mm碳钢为对象,采用1 500 W激光器系统,研究了激光功率、切割速度、离焦量和辅助气体压力等切割参数对切割质量的影响。选取切缝宽度、表面粗糙度、挂渣高度作为评价切割质量的标准,综合分析工艺参数对切割质量的影响规律并研究了影响机理,同时通过卷积神经网络对数据进行预测分析,并采用带精英策略的非支配排序的遗传算法对工艺参数进行优化,获得辅助气体为氧气条件下激光切割碳钢的最佳工艺参数为P=1 500 W、v=64 mm/s、F=2.6 bar、h=2.9 mm。通过实验发现优化后的切件切割面光滑,无挂渣现象且切缝宽度较小,达到预期标准。     

光纤激光切割不锈钢薄板工艺参数研究

;利用连续光纤激光器对0.3mm厚不锈钢薄板的切割工艺进行研究,分析了离焦量、激光功率、切割速度和调制频率对切缝宽度和切缝质量的影响。实验结果表明,实际应用时,不能只考虑一个因素,应选择适当参数,以获得所需的切缝宽度和较好的切缝质量。     

光纤激光切割不锈钢薄板工艺参数研究简

利用连续光纤激光器对0.3mm厚不锈钢薄板的切割工艺进行研究,分析了离焦量、激光功率、切割速度和调制频率对切缝宽度和切缝质量的影响.实验结果表明,实际应用时,不能只考虑一个因素,应选择适当参数,以获得所需的切缝宽度和较好的切缝质量.     

激光切割除湿机瓦楞纸芯的研究与装置

浸铝盐矿物纤维瓦楞纸芯筒是大型工业（科研）用除湿机的心脏部件．由于石棉等纤维的矿物特性以及浸铝盐后的温韧性，通常由机械刀切割的方法，难以达到所需的技术要求，为此，我们率先进行用激光切割矿物纤维纸的研究并实施有效的切割。研究结果表明：由于矿物纤维所具有的高的激光可加工性，使得CO2激光切割十分有效，能在瞬间完成吸收、烙融、汽化全过程，因而可获得速度快、切缝窄、穿透好、切口光滑等切割效果，为国内制造大型除湿机提供了基础。本文报导了CO2激光切割矿物纤维纸的理论分析和实验研究结果，计算和分析了光功率密度、焦距、焦深、焦斑、工作面、喷口尺寸、喷气量等激光切割参量与切割速度、切续宽度、穿透深度的关系。计算和实验表明：采用商品化的封离型CO2激光器，激光功率80W，切割头焦距f=120mm，喷气压力2大气压，即可实现对3mm厚的石棉瓦楞纸的有效穿透切割，切割速度达10cm／s，切缝宽度＜0．5mm，切缝边缘平整光洁，并呈微结晶状结构，很好地满足除湿机的工艺要求。     

锂离子电池正负极片纳秒脉冲激光切割新工艺及特征研究

针对锂电极耳切割质量和效率不佳等难题,建立纳秒激光切割极片的模型,研究锂电池极耳纳秒脉冲激光切割新工艺及切割形貌特征,提出通过热影响、平面毛刺、端面毛刺的平均值来判断切割锂电池极耳的质量.分析不同的纳秒脉冲切割参数(如激光能量、激光波形、重复频率、切割速度等)对切割质量的影响.通过实验研究工艺参数优化,探究纳秒脉冲激光工艺参数对切缝特征的影响规律.试验结果表明,纳秒激光波形、激光频率与激光切割速度对切缝特征影响较大,当在纳秒激光功率200 W,切割速度1000～4000 mm/s时,切割铝箔、铜箔、石墨毛刺长度能达到10～30μm切割精度,实现较好的切割效果.     

锂离子电池正负极片纳秒脉冲激光切割新工艺及特征研究

针对锂电极耳切割质量和效率不佳等难题,建立纳秒激光切割极片的模型,研究锂电池极耳纳秒脉冲激光切割新工艺及切割形貌特征,提出通过热影响、平面毛刺、端面毛刺的平均值来判断切割锂电池极耳的质量.分析不同的纳秒脉冲切割参数(如激光能量、激光波形、重复频率、切割速度等)对切割质量的影响.通过实验研究工艺参数优化,探究纳秒脉冲激光工艺参数对切缝特征的影响规律.试验结果表明,纳秒激光波形、激光频率与激光切割速度对切缝特征影响较大,当在纳秒激光功率200 W,切割速度1000～4000 mm/s时,切割铝箔、铜箔、石墨毛刺长度能达到10～30μm切割精度,实现较好的切割效果.     

锂离子电池正负极片纳秒脉冲激光切割新工艺及特征研究

针对锂电极耳切割质量和效率不佳等难题,建立纳秒激光切割极片的模型,研究锂电池极耳纳秒脉冲激光切割新工艺及切割形貌特征,提出通过热影响、平面毛刺、端面毛刺的平均值来判断切割锂电池极耳的质量.分析不同的纳秒脉冲切割参数(如激光能量、激光波形、重复频率、切割速度等)对切割质量的影响.通过实验研究工艺参数优化,探究纳秒脉冲激光工艺参数对切缝特征的影响规律.试验结果表明,纳秒激光波形、激光频率与激光切割速度对切缝特征影响较大,当在纳秒激光功率200 W,切割速度1000～4000 mm/s时,切割铝箔、铜箔、石墨毛刺长度能达到10～30μm切割精度,实现较好的切割效果.     

切割速度对6061铝合金薄板激光切割温度场的影响

为了揭示切割速度对6061铝合金薄板激光切割过程中温度场的分布及工艺规律，利用有限元软件对2 mm厚铝合金薄板在不同激光切割速度下的温度场进行数值模拟，并通过实验对仿真结果进行验证。仿真结果表明：当激光切割速度为80 mm/s时，工件的热影响区宽且熔深大，切缝处较宽范围内的材料均已达到熔点温度，随着切割速度增大，热影响区宽度、切缝处材料熔化量及熔深均逐渐减小。当切割速度为120 mm/s时，工件的熔深刚好达到材料的厚度。实验结果表明，当切割速度过低时，切缝处材料熔化量过多，在底部形成较厚的挂渣，随着切割速度增大切缝质量得到有效改善，但切割速度过大则会导致切缝处材料熔化量减小，粗糙度增大，切割速度为120 mm/s时，切缝质量最好。实验结果与仿真结果一致性较好，证明了仿真结果的准确性。     

基于图像识别的激光切割质量分析

为了准确量化激光切割过程中出现的烧蚀缺陷,提出了基于改进的形态学缺陷提取算法与基于霍夫变换的缺陷测量相结合的方法。改进的形态学提取算法用于缺陷位置的检测和提取,霍夫变换用于缺陷尺寸计算,该方法可以准确提取并测量出切割缺陷尺寸和面积特征。以不同工艺参数下切割产品烧蚀区域宽度和面积为激光切割质量评价指标,研究了切割速度和氧气压力对切割质量的影响。当氧气压力在1.0 MPa范围内,顺时针切割时烧蚀区域宽度和面积呈现出相同的变化规律,逆时针切割时烧蚀区域宽度和面积呈现相反的变化规律。顺时针切割时,切割质量最佳,最小烧蚀宽度为9 px,最小烧蚀区域面积为34 px²。实验结果表明,所提出的方法能够快速识别出激光切割产品缺陷特征,准确评价激光切割质量。     

Effect of process parameters on the cutting quality in lasox cutting of mild steel

Samples of mild steel have been cut on a CO₂ laser machine using the principle of laser assisted oxygen cutting (LASOX). The combined effects of input process parameters (cutting speed, gas pressure, laser power and stand off distance) on cut quality (heat affected zone (HAZ) width, kerf width and surface roughness) have been studied. Regression analysis has been used to develop models that describe the effect of the independent process parameters on cut quality. Using the developed model, we attempted to optimize the input parameters that would improve the cut quality (minimization of HAZ width, kerf width and surface roughness), increase the productivity and minimize the total operation cost. We found from the study that the gas pressure and cutting speed had pronounced effect on cut quality. Low gas pressure produces lower HAZ width, lower kerf width and good surface finish whereas increase in speed results in higher HAZ width, lower kerf width and good surface finish.     

基于气熔比的氧化锆陶瓷薄板激光切割质量研究

采用一种基于气熔比控制的激光精密切割方法,研究了气熔比和板厚对激光切割氧化锆陶瓷板质量的影响,即气熔比对切缝质量、切面条纹形貌及粗糙度的影响。对气熔比分别为0.099、0.160、0.184和0.202的4组试件进行观测,发现提高气熔比可明显改善切缝质量,增大切面条纹光滑区长度和条纹波长,切面粗糙度由6.969μm降低到2.482μm。同时对板厚分别为0.8mm、1.0mm、1.5mm、3.0mm的4组试件进行观测,随着板厚的增加,气熔比减小,切缝质量降低,切面粗糙度由5.946μm降低到2.287μm。板厚为0.8mm、1.0mm时,切面为较光滑的周期性条纹;板厚为1.5mm时,切面呈现两个区域,即光滑区和粗糙区;当板厚增加到3.0mm时,切面呈现三个区域,即光滑区、粗糙区和鳞状层叠区。综合研究气熔比和板厚可以加深对激光切割机理的认识,为提高氧化锆陶瓷板的激光切割质量提供理论与实验依据。     

激光切割参数对板材品质影响的研究

基于激光切割理论,依靠大量实验完成了对激光切割工艺参数的优化,对影响激光切割表面品质的主要因素,如工作气体、激光功率、辅助气体、焦点位置及切割速度进行分析对比,以切口的宽度和表面粗糙度作为衡量的指标,总结出实验材料的最优工艺参数。     

大功率激光切割机切割工艺参数分析

初步探讨了影响激光切割碳素结构钢板切割质量的因素,在其他参数不变的情况下,最小打孔功率和最小无"挂渣"切割功率随着板材厚度的增加而增大;切缝断面粗糙度随着切割气体压力和切割速度先减小后增大。     

CO2 laser cutting of Kevlar laminate: influence of assisting gas pressure

In the present study, laser cutting of Kevlar laminate is considered, and the effect of assisting gas pressure and laser output power on the end product quality is examined. The end product quality is judged via measurement of out-of-flatness and kerf width ratios. Experimental tests are carried out using a CO₂ laser beam with pulse repetition rate of 300 Hz. The cutting model introduced previously is accommodated to predict the kerf size for various laser output power and assisting gas pressures. The predictions are compared with the experimental results. It is found that the predictions of kerf size are in good agreement with the experimental results. The influence of assisting gas pressure is significant on the resulting cut quality, in which case, out-of-flatness and kerf width ratio improve considerably at high assisting gas pressures (500 kPa).     

碳纤维增强复合材料水导激光切割试验研究

采用正交试验方法对影响水导激光切割碳纤维增强复合材料（CFRP）的关键工艺参数进行了深入研究,得出了进给速度、水射流速度、脉冲频率和激光功率对切割CFRP的影响规律,并用直接对比法和极差分析法所得最优参数进行单次划槽切割对比。研究结果表明：在极差分析法所得最优参数下切割CFRP时,切缝深度增大3.2%、切缝宽度减小9.2%、切缝锥度减小11.8%、线粗糙度减小40.2%。通过与干式激光加工方法对比发现,水导激光加工技术在切割CFRP方面优势明显,由于水射流的冲刷和冷却作用,材料切割表面几乎无热影响区和纤维拔出。另外,采用正交试验所得最优工艺参数实现了4 mm厚度CFRP的无锥度切割。     

汽车用冷轧钢板的激光切割

对不同厚度汽车用冷轧钢板用激光进行切割试验。通过切割参数的适当控制，可以在高的切割速度下得到高质量切割面。并讨论了切割工艺参数对切口状态、热影响区、粗糙度等切割质量的影响。     

Parametric studies on the CO2 laser cutting of Kevlar-49 composite

In the present study, the cutting performance of a CO₂ laser on Kevlar-49 composite materials has been studied. The Taguchi technique is employed to identify the effect of laser control parameters, i.e., laser power, cutting speed, material thickness, assistance gas pressure, and laser mode, on the quality of cut parameters, namely, kerf width, dross height, and slope of the cut. From the analysis of variance (ANOVA) and signal-to-noise (S/N) ratio response tables, the significant parameters and the optimal combination levels of cutting parameters are determined. The obtained results are interpreted and modeled to closely understand the behavior and quality of CO₂ laser cutting. Kevlar-49 composites are found to be cut satisfactorily by the CO₂ laser at the optimum process parameter ranges. The results showed that laser power is the most significant parameter affecting the quality of cut parameters. The optimal combination of cutting parameters minimized the kerf width, dross height, and slope of cut to 0.103 mm, 0.101 mm, and 2.06°, respectively. The error between experimental results with optimum settings and the predicted values for the kerf width, dross height, and slope of cut lie within 2.9%, 7.92%, and 6.3%, respectively.     

Finite element analysis of laser inert gas cutting on Inconel 718

Inconel 718 has high strength, which makes it difficult to cut using conventional cutting methods. In the present study, the laser inert gas cutting of Inconel 718 was simulated by finite element analysis software ANSYS. Finite element method was used to predict thermal stress and kerf width formation during the laser cutting process. ANSYS Parameter Design Language was used to model the Gaussian-distributed heat flux from the laser beam acting on the workpiece. The removal of melted material during laser cutting to form the kerf width was modeled by employing the element death methodology in ANSYS. In addition, laser cutting was simulated at continuous wave (CW) and the effects of laser power and cutting speed on kerf width were investigated. A series of experiments were carried out to verify the predictions. The temperature fields on the workpiece were measured using thermocouples. The kerf width size was measured using a profile projector, whereas the metallurgical and morphological changes at the cutting edge were examined using scanning electron microscopy. A good correlation was found between the simulation and experimental results.     

Using a Nd:YAG laser and six axes robot to cut zinc-coated steel

Zinc-coated steel sheets are important materials in the automobile and home appliance industries. Currently, lasers are the preferred tools for metal cutting because of their good cutting quality, flexibility and excellent features and results, as compared to traditional tools. The solid-state Nd:YAG laser has successfully replaced the gaseous CO₂ laser for metal cutting; its small size and short wavelength makes it suitable for cutting bright and metal-coated materials, as well as being able to be transmitted via optical fibers and robots to cut complicated three dimensional and curved shapes. In this work, the Nd:YAG laser is used to cut 1 mm zinc coated steel sheets. We demonstrate the effects of different cutting parameters such as laser power, cutting speed, different gas types and pressures, and focus position on the cutting quality characteristics of attached dross, kerf width and cut surface roughness. Using a six axes robot, cutting speed was limited to 6 m/min because of the noticeable vibration at higher speeds. Results showed that the cutting surfaces achieved were very sharp and smooth. In cutting, Nd:YAG required less power and attained higher speeds than the published results of a CO₂ laser, which makes Nd:YAG an economical alternative to cut zinc and metal-coated materials. In addition, laser cutting using robots provided efficient and consistent cutting quality, especially in the case of 3D and countered cutting. Apart from using low speed, robots proved to be more economical than costly, specially designed CNC tables.