磨料水射流加工去除模型研究

发布时间：2018-06-03 19:26

本文选题：磨料水射流 + 冲击变形磨损　；参考：《机械工程学报》2015年07期

【摘要】：采用ANSYS Fluent对磨粒流场进行瞬态CFD仿真,得到射流过程中磨粒的分布和速度;并研究射流加工区磨粒运动机制,研究表明,新型后混合式磨料水射流加工中磨粒很容易穿过射流加工的静压区直接与工件发生作用进而去除材料。建立磨粒冲击塑性材料的冲击变形磨损模型,并结合Finnie塑性剪切磨损去除模型建立磨料水射流加工去除模型,模型表明,射流加工中心区域的材料去除量最高。根据新型后混合式磨料水射流系统进行塑性材料的磨料水射流加工试验,结果表明,射流加工中心区域材料去除最高,这是由于射流加工中心区域磨粒冲击角度较大、磨粒速度较高,材料以冲击变形磨损去除为主;远离射流冲击中心区域材料去除较低,材料以剪切磨损去除为主,与磨料水射流加工去除模型是完全一致的,证实磨料水射流加工去除模型的正确性。
[Abstract]:The distribution and velocity of abrasive particles in the jet process are obtained by transient CFD simulation of the flow field of abrasive particles by ANSYS Fluent, and the motion mechanism of abrasive particles in the jet processing zone is studied. In the new type of post-mixed abrasive water jet machining, the abrasive particles can easily pass through the static pressure zone of the jet processing and directly interact with the workpiece and then remove the material. The impact deformation and wear model of abrasive impingement plastic materials and the Finnie plastic shear wear removal model are established. The model shows that the material removal rate is the highest in the central area of jet machining. According to the new type of post-mixed abrasive water jet system, the abrasive water jet processing test of plastic material is carried out. The results show that the material removal in the center of jet machining is the highest, which is due to the large impact angle of abrasive particles in the area of jet machining center. The abrasive particle velocity is higher, the material is mainly removed by impact deformation and wear, the material removed from the center of jet impingement is lower, and the material is mainly removed by shear wear, which is completely consistent with the removal model of abrasive water jet machining. It is proved that the removal model of abrasive water jet machining is correct.
【作者单位】：哈尔滨工业大学机电工程学院;
【基金】：国家自然科学基金(51275116) 航空科学基金(2012EE77010) 黑龙江省博士后启动基金(LBH-Q11090)资助项目
【分类号】：TG664

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