红松水导纳秒激光烧蚀机制及加工试验

doi:10.11707/j.1001-7488.20200822

Abstract

Abstract:

Objective: This paper aimed to study ablation mechanisms on the surface of limber processed by water-jet guided nanosecond laser,and to discuss the influences of laser power and cutting speed on cutting width,with or without water-jet guided system. Additionally,it aimed to obtain the relationships of laser power,cutting speed and cutting width,and to analyze the influence factors of the surface quality of Korean pine. Method: On the basis of introducing test bench of water-jet guided nanosecond laser,the ablation mechanisms on the surface of Korean pine processed by water-jet guided nanosecond laser was researched,and the coupling mechanisms of water jet and nanosecond laser on the surface of the Korean pine was deeply analyzed; the experiment of water jet-guided nanosecond laser cutting Korean pine was carried out; Korean pine was used as the materials,the cutting width of Korean pine was repeatedly measured and average value was obtained. By adopting the method of single factor experiment,with or without water-jet guided system,the influences of different laser powers and cutting speeds on cutting width was discussed; the morphology of the surface of the cutting width was observed by scanning electron microscopy(SEM); the experimental data was processed through the multiple linear regression analysis by the IBM SPSS Statistics 23,and the predicted model was established. Result: Cutting width increased with the increase of laser power,and decreased with the increase of cutting speed. Without water-jet guided system,when the cutting speed of 50 mm·s^-1 and laser power of 6 W,minimum cutting width of Korean pine surface was 0.53 mm; with water-jet guided system,when the cut speed of 50 mm·s^-1 and laser power of 6 W,minimum cutting width of Korean pine surface was 0.31 mm. Through the observation of cutting surface morphology,without the water-jet assisted system,some residues were left on the inner walls of tracheids,and cutting surface was rough; with the water-jet assisted system,nearly no residues were left on the inner walls of tracheids,the cutting surface was smooth and the surface quality of Korean pine cutting was better. Through multiple linear regression analysis,the relationships of laser power,cutting speed and cutting width was obtained. The prediction model had a good prediction precision. Conclusion: The relationships between the process parameters and the cutting width should be controlled when processing water-jet guided nanosecond laser machining wood. When the cutting speed is larger and laser power is smaller,a minimum cutting width could be obtained. Compared with the without water-jet guided system,the surface quality of Korean pine with water-jet guided system would be better.

Key words: nanosecond laser, water-jet guided system, Korean pine, morphology, multiple linear regression

CLC Number:

S784

Chunmei Yang,Ting Jiang,Jiuqing Liu,Yan Ma,Qian Miao,Wenji Yu. Ablation Mechanism and Experiment of Korean Pine by Water-Jet Guided Nanosecond Laser[J]. Scientia Silvae Sinicae, 2020, 56(8): 201-208.

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因素Factor	水平Level
因素Factor	1	2	3
A：水流速度Water-jet speed/(m·s^-1)	0(A₀)	5.75(A₁)	11.50(A₂)
B：激光功率Laser power/W	6(B₁)	18(B₂)
C：切割速度Cutting speed/(mm·s^-1)	20(C₁)	50(C₂)

A×B		C₁			C₂
A₀	B₁	0.79	0.78	0.84	0.50	0.55	0.49
A₀	B₂	1.13	1.16	1.11	0.76	0.81	0.75
A₁	B₁	0.61	0.63	0.67	0.30	0.28	0.35
A₁	B₂	0.81	0.84	0.88	0.53	0.51	0.47
A₂	B₁	0.50	0.52	0.55	0.24	0.23	0.27
A₂	B₂	0.55	0.57	0.52	0.28	0.24	0.27

源 Source	平方和 Sum of squares	自由度 Degree of freedom	均方 Mean square	F	Sig.
修正模型Corrected model	2.290	11	0.208	243.340	0.000
截距Intercept	12.591	1	12.591	14 716.367	0.000
A	1.019	2	0.509	595.269	0.000
B	0.265	1	0.265	310.003	0.000
C	0.880	1	0.880	1 029.120	0.000
A×B	0.117	2	0.059	68.406	0.000
A×C	0.005	2	0.002	2.886	0.075
B×C	0.002	1	0.002	2.367	0.137
A×B×C	0.002	2	0.001	1.062	0.362
误差Error	0.021	24	0.001
总计Total	14.901	36
校正的总计Corrected total	2.311	35

模型 Model	非标准化系数 Non-standard coefficient		统计量t Statistic t	Sig.
模型 Model	系数 Coefficient	标准误差 Standard error	统计量t Statistic t	Sig.
常量Constant	0.852	0.035	24.113	0.000
A	-0.012	0.004	-2.901	0.023
B	0.026	0.002	11.660	0.000
C	-0.010	0.001	-18.787	0.000
A×B	-0.002	0.000	-6.731	0.000

试样编号 Sample number	水流速度 Water-jet speed/(m·s^-1)	激光功率 Laser power/W	切割速度 Cutting speed/(mm·s^-1)	切缝宽度Cutting width/mm		相对误差 Relative error(%)
试样编号 Sample number	水流速度 Water-jet speed/(m·s^-1)	激光功率 Laser power/W	切割速度 Cutting speed/(mm·s^-1)	实测值 Measured value	预测值 Predicted value	相对误差 Relative error(%)
1	5.75	6	10	0.72	0.77	6.94
2	5.75	6	25	0.58	0.62	6.45
3	0	12	40	0.75	0.764	1.87
4	0	18	5	1.29	1.27	1.55
5	11.5	18	20	0.55	0.568	3.27

Ablation Mechanism and Experiment of Korean Pine by Water-Jet Guided Nanosecond Laser

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参数Parameter	试样编号Sample number
参数Parameter	1	2	3	4	5	6	7	8	9	10
激光功率Laser power/W	6	8	10	12	14	16	18	20	22	24
切割速度Cutting speed/(mm·s^-1)	5	10	15	20	25	30	35	40	45	50

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