保护气压力对光内送粉喷嘴粉末流场的影响研究

为了提高激光金属直接成形中光内同轴送粉喷嘴粉末流场的汇聚性，获得大的聚焦焦距、小的聚焦直径及小的发散角，对卸载及载气两种方式下不同保护气压力对粉末流聚焦参数的影响规律进行了实验研究。结果表明：在卸载方式下，随保护气体压力逐渐增大，粉末聚焦焦距逐渐增大，粉末聚焦直径变小，发散角减小，粉末汇聚效果变好；在载气方式下，随保护气体压力逐渐增大，粉末聚焦焦距先增大后减小，聚焦直径逐渐变小，发散角逐渐降低。因此，在载气方式下应选择保护气压力与载气压力大小接近为宜。研究结果对光内送粉激光金属直接成形工艺优化具有指导意义。

Abstract

In order to improve the powder convergent characteristics of flow field of the inside-laser powder feeding nozzle in laser metal direct forming (LMDF) and obtain longger converging focal length, smaller converging diameter and divergence angle, the powder converging parameters are studied by experiments with different shielding gas pressure under unloading and carrier gas conditions. The experimental results indicate that the powder converging focal length increases, converging diameter and divergence angle decrease with the growth of shielding gas pressure under unloading conditions. The powder convergent characteristics gets better. The powder converging focal length firstly gets longger then gets shorter, converging diameter and divergence angle decrease with the shielding gas pressure increasing under carrier gas state. The effect is preferred when the shielding gas pressure is equal to the carrier gas pressure. It has an important guiding significance for process optimization during LMDF with the inside-laser powder feeding way.

参考文献

[1] 李涤尘, 贺健康, 田小永, 等. 增材制造: 实现宏微结构一体化制造[J]. 机械工程学报, 2013, 49(6): 129-135.

Li Dichen, He Jiankang, Tian Xiaoyong, et al.. Additive manufacturing: integrated fabrication of macro/microstructures[J]. Journal of Mechanical Engineering, 2013, 49(6): 129-135.

[2] 王华明, 张述泉, 王向明. 大型钛合金结构件激光直接制造的进展与挑战[J]. 中国激光, 2009, 36(12): 3204-3209.

Wang Huaming, Zhang Shuquan, Wang Xiangming. Progress and challenges of laser direct manufacturing of large titanium structural components[J]. Chinese J Lasers, 2009, 36(12): 3204-3209.

[3] Mazumder J, Dutta D, Kikuchi N, et al.. Closed loop direct metal deposition: art to part[J]. Optics and Lasers in Engineering, 2000, 34(4-6): 397-414.

[4] 石世宏, 傅戈雁, 李龙, 等. 中空激光光内同轴送丝熔覆工艺的实现及其试验研究[J]. 中国激光, 2010, 37(1): 266-270.

Shi Shihong, Fu Geyan, Li Long, et al.. Realization and research of laser cladding with method of internal wire feeding through a hollow laser beam[J]. Chinese J Lasers, 2010, 37(1): 266-270.

[5] 朱刚贤, 李涤尘, 张安峰, 等. 沉积层结构对同轴送粉喷嘴粉末流场的影响规律[J]. 中国激光, 2010, 37(6): 1636-1642.

Zhu Gangxian, Li Dichen, Zhang Anfeng, et al.. Influence of deposited layer′s structure on flow field of coaxial powder feeding nozzle[J]. Chinese J Lasers, 2010, 37(6): 1636-1642.

[6] 王明娣. 基于光内送粉的激光熔覆快速制造机理与工艺研究[D]. 南京: 南京航空航天大学, 2008. 1-15.

Wang Mingdi. Research on Mechanism and Process of Laser Cladding Rapid Manufacturing Using Coaxial Inside-Beam Powder Feeding[D]. Nanjing: Nanjing University of Astronautics, 2008. 1-15.

[7] Wen G, Greenville S C. Compact coaxial nozzle for laser cladding[P]. US Patent, 7259353, 2007-8-21.

[8] Harris J G, Brandt M. Powder delivery nozzle[P]. US Patent, 7605346, 2009-10-20.

[9] Wu X. A review of laser fabrication of metallic engineering components and of materials[J]. Materials Science and Technology, 2007, 23(6): 631-640.

[10] 石世宏, 傅戈雁, 王安军, 等. 激光加工成形制造光内送粉工艺与光内送粉喷头[P]. 中国专利, 200610116413.1, 2006-9-22.

Shi Shihong, Fu Geyan, Wang Anjun, et al.. Laser Forming Manufacturing Process and Nozzle of Inside-Laser Power Feeding[P]. Chinese Patent, 200610116413.1, 2006-9-22.

[11] 田凤杰. 卸载式激光同轴送粉喷嘴的研制[J]. 中国机械工程, 2011, 22(19): 2298-2302.

Tian Fengjie. Development on coaxial feeding with unloading carrier gas for laser manufacturing[J]. China Mechanical Engineering, 2011, 22(19): 2298-2302.

[12] Guijun Bi, Bert Schurmann, Andres Gasser, et al.. Development and qualification of a novel laser-cladding head with integrated sensors[J]. International Journal of Machine Tools & Manufacture, 2007, 47: 555-561.

王丽芳, 朱刚贤, 石世宏, 傅戈雁. 保护气压力对光内送粉喷嘴粉末流场的影响研究[J]. 中国激光, 2013, 40(s1): s103007. Wang Lifang, Zhu Gangxian, Shi Shihong, Fu Geyan. Influence of Shielding Gas Pressure on Flow Field of Inside-Laser Powder Feeding Nozzle[J]. Chinese Journal of Lasers, 2013, 40(s1): s103007.

保护气压力对光内送粉喷嘴粉末流场的影响研究

关于本站 Cookie 的使用提示

全站搜索

保护气压力对光内送粉喷嘴粉末流场的影响研究

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索