摘要
喷丸作为一种重要的金属表面机械处理工艺,其加工质量与固体丸粒在高速气流作用下的运动规律密切相关。探究一种精确可行的喷丸丸粒速度测量方法,明确喷丸丸粒流的空间散射特征和速度场分布特征,对于优化喷丸工艺参数至关重要。基于高速摄像机,搭建了喷丸丸粒运动高速图像数据采集系统,捕捉喷丸中丸粒的瞬时空间位置变化特征。采用Photoshop图像处理软件对采集的照片进行预处理,获得具有高对比度的丸粒流黑白二值化图片。使用开源的粒子图像测速(Particle Image Velocimetry,PIV)软件PIVLab对丸粒流图像进行数据处理,获得喷丸丸粒流的速度场结果。结果表明,在喷气压力为0.4 MPa,采用0.4 mm铸钢丸粒条件下,丸粒流的散射锥体倾角为10°,丸粒最大运动速度约为46.5 m/s。在不同的空间截面上,丸粒运动速度呈现高斯分布特征,且其标准差随丸粒与喷嘴之间的距离增大而增大。丸粒在离开喷嘴后速度迅速增长至稳定值,速度变化符合Logistic函数特征。与经验公式相比,所得到的丸粒速度场分布公式更加准确,且能体现丸粒的空间分布特征。
Shot peening is an important mechanical treatment process for metal surface.Its treatment quality is closely related to the shot motion behavior which is derived by high speed airflow.To accurate control shots motion and improve treatment quality in shot peening,it is great significance to explore an accurate measurement method and uncover the law of shots motion in peening process.With high speed camera,a high-speed image data acquisition system for shots in peening process was established.In addition,the images of instantaneous spatial position of shots in peening were captured.In order to improve contrast,Photoshop was used to covert the collected photos into black-and-white binary images.The open source particle image velocimetry(PIV)software PIVLab was used to analyze these images,and the velocity field of shot flow was carefully calculated.The results show that,under the condition of 0.4 MPa gas pressure and 0.4 mm cast steel shot,the scattering cone angle of shot flow was 10 degrees,and the maximum velocity of shot was about 46.5 m/s.On different spatial sections,the velocity of shots presents Gaussian distribution.In addition,the standard deviation of this Gaussian distribution is increased with enlarge the distance between shots and nozzles.The velocity of shots increases rapidly to a stable value after leaving nozzle,and the velocity variation conforms to the Logistic function.Compared with the empirical formula,the obtained formula of velocity field distribution of shots is more accurate.Furthermore,the spatial distribution characteristics of shots flow in peening process can be exactly gained.
作者
范俊锴
孙明阁
赵武
刘伟
FAN JunKai;SUN MingGe;ZHAO Wu;LIU Wei(School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《机械强度》
CAS
CSCD
北大核心
2023年第4期799-804,共6页
Journal of Mechanical Strength
基金
国家自然科学基金项目(51405136)
河南省科技厅科技攻关项目(212102210004)
河南理工大学青年骨干教师资助计划(2020XQG-01)
河南理工大学机械工程重点学科资助。
