目的：研究光纤激光毛化应用于模具表面，改善其摩擦特性的可行性。方法采用单因素变化法，研究激光功率、脉宽、频率、离焦量对毛化形貌的影响规律，分析毛化区域的显微硬度，并对不同形貌的毛化试样和光滑试样的摩擦性能进行对比。结果匹配特定的参数，可获得火山口形貌或球冠状形貌。毛化区域的硬度相对基材提高显著，最大提高了近4倍。同时，在模拟冷冲压拉深模具低速重载工况的摩擦实验中，毛化试样的摩擦系数比光滑试样大，同时随着毛化点直径、间距的增大，摩擦系数相应减小。结论激光毛化技术可对材料表面进行改形改性，能够用于优化模具表面摩擦特性。
ABSTRACT:Objective To investigate the feasibility of fiber laser texturing on the mold surface and the improvement of the fric-tion properties. Methods Using single factor variation method, the influencing laws of the power, pulse width, frequency, and de-focus amount on different textures were investigated, and the hardness of the textured topography was also measured. Meanwhile, the friction properties of stainless steel samples with different surface textures disposed by laser texturing as well as smooth samples were comparatively investigated. Results It showed that textures such as crater shape and sombrero shape texture topography could be obtained by certain laser parameters and supplementary parameters. The hardness of the textured points was significantly in-creased, and the maximum value was nearly four times the hardness of the matrix material. During the friction experiment, com-pared with smooth samples, the friction coefficients of samples with different surface textures were higher under the low speed and heavy load condition to simulate drawing mold. With the increase of the diameter and spacing, the friction coefficient decreased. Conclusion Laser texturing could make a change to surface topography and property, and could therefore be used to optimize the surface friction properties of molds.
参考文献
| [1] | Sungae Lee;Shahrukh Niazi;Chang-Dong Yeo .The Change in Surface Properties of Magnetic Recording Media Under Pulsed Laser Application[J].Tribology letters,2012(1):57-65. |
| [2] | S.C. Chen;D.G. Cahill;C.P. Grigoropoulos .Melting and Surface Deformation in Pulsed Laser Surface Micromodification of Ni-P Disks[J].Journal of heat transfer: Transactions of the ASME,2000(1):107-112. |
| [3] | T. D. Bennett;D. J. Krajnovich;C. P. Grigoropoulos;P. Baumgart;A. C. Tam .Marangoni mechanism in pulsed laser texturing of magnetic disk substrates[J].Journal of heat transfer: Transactions of the ASME,1997(3):589-596. |
| [4] | 刘莹,陈大融,杨文言.轧辊表面微凸体形貌激光毛化技术的试验研究[J].机械工程学报,2003(07):107-110. |
| [5] | 许伯强,汪昊,徐桂东,徐晨光,张子国.金属材料中激光产生熔池的数值模拟及应用[J].江苏大学学报（自然科学版）,2010(03):358-362. |
| [6] | 张瑞华,韩帅,梁海姣,李宝磊,尹燕,张岩.轧辊表面光纤激光毛化工艺研究[J].应用激光,2011(06):451-455. |
| [7] | 程虎,方志刚,赵先锐,戴晟,高玉新.NAK80模具钢表面激光熔覆Ni基碳化钨合金涂层的组织和性能[J].表面技术,2011(01):5-7. |
| [8] | 黄伟容,肖泽辉.激光熔覆陶瓷涂层的研究现状[J].表面技术,2009(04):57-59,65. |
| [9] | 罗成,董仕节,熊翔,罗平.电火花沉积表面处理技术的应用进展[J].表面技术,2009(04):53-56. |
| [10] | 金君,董晨竹,徐东,高玉新.电火花沉积Ni基合金涂层的摩擦磨损特性[J].表面技术,2011(06):32-34. |
| [11] | M. Ramezani;Z. M. Ripin;R. Ahmad .Numerical simulation of sheet stamping process using flexible punch[J].Proceedings of the Institution of Mechanical Engineers, Part B. Journal of engineering manufacture,2009(7):829-840. |
| [12] | Maziar Ramezani;Zaidi Mohd Ripin;Roslan Ahmad .Sheet metal forming with the aid of flexible punch, numerical approach and experimental validation[J].CIRP Journal of Manufacturing Science and Technology,2010(3):196-203. |
| [13] | H. Zein;M. El Sherbiny;M. Abd-Rabou;M. El shazly .Thinning and spring back prediction of sheet metal in the deep drawing process[J].Materials & design,2014(Jan.):797-808. |
| [14] | BASAVARAJ V;SHEKHAWAT S K;NARASIMHAN K et al.Constrained Tensile Stretching of Steel Strips under Dif-ferent Lubrication:Predicting Macroscopic Strain Distribu-tions with Microstructural Inputs[J].International Journal of Material Forming,2014,7(32):1-13. |
| [15] | A. Tomala;S. Hernandez;M. Rodriguez Ripoll;E. Badisch;B. Prakash.Tribological performance of some solid lubricants for hot forming through laboratory simulative tests[J].Tribology International,2014:164-173. |
| [16] | 张春华,李春彦,张松,康煜平,陈江,才庆魁.H13模具钢激光熔凝层的组织及性能[J].金属热处理,2004(10):14-17. |
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