| 引用本文: | 吕东喜,王洪祥,唐永健,黄燕华,张海军.旋转超声加工中磨粒冲击作用的仿真分析[J].哈尔滨工业大学学报,2013,45(3):50.DOI:10.11918/j.issn.0367-6234.2013.03.009 |
| L Dongxi,WANG Hongxiang,TANG Yongjian,HUANG Yanhua,ZHANG Haijun.Simulation analysis on the impact effects of the abrasive in rotary ultrasonic machining process[J].Journal of Harbin Institute of Technology,2013,45(3):50.DOI:10.11918/j.issn.0367-6234.2013.03.009 |
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| 摘要: |
| 在对单个磨粒进行动力学分析的基础上,定义了评价超声冲击作用大小的量纲一的参数K．采用光滑质点流体动力学(SPH)有限元分析方法,研究了旋转超声加工过程中磨粒的超声冲击作用对材料内部裂纹形成及扩展的影响．仿真结果表明:随着K值的增大,斜向裂纹的倾角减小,扩展深度逐渐降低,磨粒的超声冲击作用是裂纹形成及扩展的主要原因；在切削过程中,随着切削深度的增加,切削力逐渐增大;但是当裂纹产生以后垂向冲击力急剧减小,而横向冲击力变化不大；加工中碎屑的崩碎使磨粒对工件材料具有局部微冲击作用,导致两个方向的切削力都在相对较大范围内波动． |
| 关键词: 旋转超声加工(RUM) 光滑质点流体力学(SPH) 脆性材料 裂纹 |
| DOI：10.11918/j.issn.0367-6234.2013.03.009 |
| 分类号: |
| 基金项目:国家自然科学基金委员会和中国工程物理研究院联合基金资助项目(U1230110). |
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| Simulation analysis on the impact effects of the abrasive in rotary ultrasonic machining process |
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L Dongxi1, WANG Hongxiang1, TANG Yongjian2, HUANG Yanhua2, ZHANG Haijun2
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(1. School of Mechanical and Electrical Engineering, Harbin Institute of Technology, 150001 Harbin, China; 2. Research Center of Laser Fusion, China Academy of Engineering Physics, 621900 Mianyang, Sichuan,China)
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| Abstract: |
| Based on the theoretical analysis of kinematics principles of the abrasive, dimensionless parameter K was defined to describe the impact effects. Smooth Particle Hydrodynamics (SPH) Finite Element Method was used to study the mechanisms of crack formation and extension in the interior of the material under the impact of the abrasive. The simulation results showed that, with the increasing of K, the inclination and the depth of the inclined crack decreased. The interaction mechanisms between the abrasive and the workpiece showed that the impact of the abrasive was the main reason for the crack formation and extension. In the cutting process, the cutting force increased rapidly, and then, due to the formation of the cracks, the vertical impact forces reduced dramatically, but the horizontal impact force changed little. As the local micro-impact phenomenon between the material and the abrasive, the cutting forces in both directions fluctuated within a relatively large range. |
| Key words: rotary ultrasonic machining (RUM) smooth particle hydrodynamics(SPH) brittle material crack
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