EXPERIMENTAL STUDY ON GEOMETRIC PRECISION OF MICROHOLES DRILLING BY PICOSECOND LASER

被引：0

作者：

Zhang, Zhanfei ^{[1
]}

Wang, Wenhu ^{[1
]}

Jiang, Ruisong ^{[2
]}

Jin, Chengcheng ^{[1
]}

Zhu, Xiaoxiang ^{[1
]}

Liu, Xiaofen ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sch Mech Engn, Xian, Shaanxi, Peoples R China

[2] Sichuan Univ, Sch Aeronaut & Astronaut, Chengdu, Sichuan, Peoples R China

来源：

PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2019, VOL 2B | 2019年

基金：

中国国家自然科学基金;

关键词：

Ultrafast laser; Single crystal alloy; Film cooling hole; Process parameters; Geometric precision; NICKEL-BASED SUPERALLOY; ABLATION; MODEL;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The geometric precision of the film cooling hole has a great influence on the cooling efficiency and fatigue life of the turbine blade. In the paper, the processing of film cooling holes on DD6 single crystal superalloy by picosecond laser is investigated. The pulse laser at pulse duration of 2.1ps, the wavelength of 1030 nm and the repetition frequency of 75 kHz are selected to study the pulse energy, scanning speed, defocus and scanning width on the geometric precision of the film cooling hole. After drilling, the three-dimensional coordinates of the entrance and exit plane of the film cooling holes are obtained by using the threedimensional surface measuring instrument. The diameter, roundness and taper of the film cooling holes are calculated by extracting and processing the coordinate points of the contour around the microholes. The experimental results show that defocusing has the greatest influence on the taper and roundness of film cooling holes. Negative defocusing can produce severe plasma shielding, which makes the exit roundness and taper larger. With larger pulses, positive defocusing and larger scanning width, smaller roundness and taper can be produced.

引用

页数：6

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