基于LS-DYNA仿真的射流加工参数分析

发布时间：2018-05-29 14:09

本文选题：磨料水射流 + LS-DYNA　；参考：《表面技术》2017年10期

【摘要】：目的通过LS-DYNA对磨料射流冲蚀切削进行仿真,研究相关工艺参数对切削参数的影响。方法采用磨料水射流对Al_2O_3陶瓷进行了单点冲蚀仿真和切削仿真研究,其中水和磨料粒子采用SPH方法建模,氧化铝陶瓷工件采用FEM方法建模,并通过SPH-FEM耦合算法,实现射流冲蚀切削过程的仿真。结果分析射流冲蚀过程仿真和切削过程仿真可知,射流加工前期,由于射流中磨粒碰撞与反弹,使壁面成不规则"V"型。初始阶段,切深随计算时间呈线性增加,同时壁面对磨粒产生制约作用,从而使加工处的孔深基本不再增加。由于磨粒在冲蚀处壁面底部的冲蚀作用,使凹坑底部宽度增加并迅速趋于稳定。同时切削仿真与冲蚀仿真也存在一定区别,主要由于切削过程设定了移动速度。结论将仿真结果与实验结果进行比较可知,切削深度随着泵压的增大而成线性增大,切深随磨料流量的增大而增大,随靶距和横移速度的增大而减小。其中切深与磨料流量、靶距、横移速度均为非线性关系,工件最大切深与计算时间不呈线性关系增长。
[Abstract]:Aim to simulate the abrasive jet cutting by LS-DYNA and to study the influence of relevant technological parameters on the cutting parameters. Methods the single point erosion simulation and cutting simulation of Al_2O_3 ceramics were carried out by abrasive water jet. The water and abrasive particles were modeled by SPH method, the alumina ceramic workpieces were modeled by FEM method, and the SPH-FEM coupling algorithm was used. The simulation of jet erosion cutting process is realized. Results by analyzing the simulation of jet erosion process and cutting process, it can be seen that in the early stage of jet processing, the wall becomes irregular "V" type due to the impact and rebound of abrasive particles in the jet. At the initial stage, the tangent depth increases linearly with the calculation time, and the wall is restricted by the abrasive particles, which makes the hole depth in the machining place basically not increase. The width of the bottom of the pit increases and tends to stabilize rapidly because of the erosion of the abrasive particles at the bottom of the wall. At the same time, there are some differences between cutting simulation and erosion simulation, mainly because the cutting process sets the moving speed. Conclusion compared with the experimental results, the cutting depth increases linearly with the increase of pump pressure, the cutting depth increases with the increase of abrasive flow rate, and decreases with the increase of target distance and transverse velocity. The relationship between cutting depth and abrasive flow, target distance and transverse velocity is nonlinear, and the maximum cutting depth of workpiece does not increase linearly with calculating time.
【作者单位】：江南大学江苏省食品先进制造装备技术重点实验室;
【基金】：国家自然科学基金资助项目(51575237)~~
【分类号】：TQ174.6

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