摘要
采用传统磨削工艺对电梯曳引轮槽进行加工时,较难进行微量均匀的磨削力控制,以及进行仿形光整加工,为此提出了一种约束式磨料流光整加工方法,对磨料流的加工特性进行了理论建模、仿真分析和加工实验研究。首先,分析了约束式磨料流光整加工原理,并基于欧拉多相流理论及标准k-ε双方程模型,构建了磨料流动力学模型;然后,计算研究了约束流道内磨料流动力学特性,得到了工件表面流体动压及磨料压力随关键工艺参数的变化规律;最后,搭建了约束式磨料流光整加工实验平台,以球墨铸铁作为工件材料,开展了光整加工对比实验,对模拟计算及加工方法进行了验证。研究结果表明:约束空间内的磨料压力及动压达到最大值,是有效光整加工区域;在15°~75°范围内,约束空间入口角度越小,磨料压力分布越均匀,流体动压越剧烈;随着约束空间高度的减小,无量纲化材料去除率呈指数级增大,加工效率更高。
Aiming at the difficulty in achieving the control of micro uniform grinding force and the profiling finishing for the traction wheel groove of elevator utilizing the traditional grinding processes,a constrained abrasive flow finishing method was proposed,and the process characteristics for the abrasive flow were studied by means of theoretical modeling,simulation analysis and finishing experiment.Firstly,the principle of the constrained abrasive flow finishing was analyzed,and a hydrodynamic model of the abrasive flow was constructed based on the Eulerian multiphase flow theory and the standard k-εdouble equation model.Then,the fluid dynamics characteristics of the abrasive flow within the constrained flow passage were calculated and studied,yielding the variation patterns of fluid dynamic pressure and abrasive pressure on the workpiece surface with the key process parameters.Finally,a constrained abrasive flow finishing experimental platform was established,and the comparative experiments of finishing were conducted using ductile iron as the workpiece material to verify the simulation calculation and the processing method.The research results indicate that the abrasive pressure and the dynamic pressure reach their maximum values within the constrained space,which is the effective finishing area.Within the range of 15 to 75 degrees,the smaller the inlet angle of the constrained space,the more uniform the distribution of the abrasive pressure,and the more intense the fluid dynamic pressure.As the height of the constrained space decreases,the dimensionless material removal rate increases exponentially,resulting in higher processing efficiency.
作者
沈一鸣
张雍
尤悦
王辉
葛江勤
SHEN Yiming;ZHANG Yong;YOU Yue;WANG Hui;GE Jiangqin(Taizhou Special Equipment Inspection and Testing Research Institute,Taizhou 318000,China;College of Mechanical and Electrical Engineering,China Jiliang University,Hangzhou 310018,China)
出处
《机电工程》
CAS
北大核心
2024年第10期1768-1775,共8页
Journal of Mechanical & Electrical Engineering
基金
浙江省自然科学基金资助项目(LY22E050008)
台州市科技计划资助项目(23gyb42)。
关键词
磨料流光整加工
曳引轮槽
数值模拟
磨料压力分布
粗糙度
约束空间
加工效率
abrasive flow finishing
traction wheel groove
numerical simulation
abrasive pressure distribution
roughness
constraint space
process efficiency
