软性磨粒流双入口约束流场数值分析及加工试验研究

›› 2012, Vol. 48 ›› Issue (19): 177-185.

软性磨粒流双入口约束流场数值分析及加工试验研究

计时鸣;付有志;谭大鹏

浙江工业大学特种装备制造与先进加工技术教育部重点实验室;浙江工业大学浙江省特种装备制造与先进加工技术重点实验室

发布日期:2012-10-05

Numerical Analysis and Processing Experiment of Double-inlet Restraint Flow Field in the Soft Abrasive Flow Machining

JI Shiming;FU Youzhi; TAN Dapeng

Key Laboratory of Special Purpose Equipment and Advanced Manufacturing Technology of Ministry of Education, Zhejiang University of Technology Zhejiang Provincial Key Laboratory of Special Purpose Equipment and Advanced Manufacturing Technology, Zhejiang University of Technology

Published:2012-10-05

摘要/Abstract

摘要： 针对软性磨粒流精密加工中单入口加工装置加工不均匀问题，提出一种基于流体碰撞理论的双入口加工新方法。借助计算流体力学软件，结合剪切输运(Shear stress transport, SST) k-ω湍流模型及Mixture混合模型，分析两种加工装置内磨粒流动力学特性，数值模拟结果显示：单入口加工装置内磨粒流流场固定分布，双入口加工装置内磨粒流流场呈现周期性摆动，提高约束流道内磨粒流流动无序性。加工试验进行35 h后，单入口加工装置加工工件表面粗糙度Ra值分散，工件表面存在严重加工不均匀性；双入口加工装置工件表面各处粗糙度Ra集中且各方向粗糙度值均小于单入口加工装置，表面加工效果均匀。上述研究结果表明：双入口加工装置有效地扰乱约束流道内磨粒流流场，提高磨粒流流动的无序性，改善表面加工质量。

关键词: SST k-ω湍流模型, 流体碰撞, 软性磨粒流加工, 双入口加工装置

Abstract: Uneven processing effect is conducted by the single-inlet processing device in soft abrasive flow machining, to overcome this problem, a novel double-inlet processing method is brought forward based on the liquid collision theory. Combining shear stress transport(SST) k-ω turbulence model with the mixture model in computational fluid dynamics software, the dynamics characteristics for two kinds of processing devices are studied. The results show that flow field distribution of single-inlet processing device is fixed; on the contrary, a cyclic swing occurs in double-inlet processing device, and there is an improvement of the disorderly movement of abrasive flow. Work piece surface roughness value Ra in single-inlet processing device is disperse after 35 h, and the processing effect is uneven, while the surface roughness of work piece in double-inlet processing device has a centralized distribution and a smaller value than that in single-inlet processing device, and the processing effect is better. The above results show that the flow filed in restraint channel is disturbed by two flows in the double-inlet processing device, disorderly movement of the abrasive flow is improved, and processing quality is better.

Key words: Double-inlet processing device, Liquid collision, Soft abrasive flow machining, SST k-ω turbulence model

中图分类号:

TG664

计时鸣;付有志;谭大鹏. 软性磨粒流双入口约束流场数值分析及加工试验研究[J]. , 2012, 48(19): 177-185.

JI Shiming;FU Youzhi;TAN Dapeng. Numerical Analysis and Processing Experiment of Double-inlet Restraint Flow Field in the Soft Abrasive Flow Machining[J]. , 2012, 48(19): 177-185.