|
|
|
| Simulation Study on Gap Flow Field in EDM Small-Hole Machining Based on Internal Flush |
| LIU Yu, LIU Chuangye, MA Fujian, YANG Dapeng, SHA Zhihua, HUANG Wenli, ZHANG Shengfang |
| (School of Mechanical Engineering, Dalian Jiaotong University, Dalian 116028, China) |
|
|
|
|
Abstract In the process of small-hole machining in EDM, if the debris and bubbles are not removed from the gap flow field, which will seriously affect the processing efficiency and surface quality. By analyzing the characteristics of discharge gap, the geometric model of three-dimensional cylindrical gap flow field is established, the VOF, DPM model and the secondary development function of FLUENT were used to realize the continuous and random generation of debris and bubbles in the bottom machining gap, the simulation model of gas-liquid-solid three phase flow coupling of gap flow field in micro hole EDM was established, and adding hollow internal flushing liquid to remove debris, the distribution of debris and bubbles in the gap flow field was simulated and analyzed under different velocity and processing depth. Through the statistics of debris particle distribution, the results show that increasing the velocity of the internal flushing fluid can promote the remove of the debris and reduce the concentration of the bubble phase in the bottom gap and the side gap. The smaller the machining depth is, the greater the upward velocity of the bottom gap is, and the easier the debris and bubbles are removed.
|
|
|
|
|
|
|
|
|
2020, 
